83_FR_46278 83 FR 46101 - Special Conditions: The Boeing Company (Boeing), Model 777 Series Airplanes; Dynamic Test Requirements for Single Occupant Oblique Seats, With or Without Airbag Devices or 3-Point Restraints

83 FR 46101 - Special Conditions: The Boeing Company (Boeing), Model 777 Series Airplanes; Dynamic Test Requirements for Single Occupant Oblique Seats, With or Without Airbag Devices or 3-Point Restraints

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 83, Issue 177 (September 12, 2018)

Page Range46101-46103
FR Document2018-19752

These amended special conditions are issued for the Boeing Model 777 series airplanes. This amendment states that the Boeing Model 777 series airplanes oblique (side-facing) seats may be installed at an angle of 18 to 45 degrees to the airplane centerline and may include a 3-point or airbag restraint system, or both, for occupant restraint and injury protection. This airplane will have novel or unusual design features when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. These design features are oblique (side-facing) single-occupant passenger seats equipped with or without airbag devices or 3-point restraints. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.

Federal Register, Volume 83 Issue 177 (Wednesday, September 12, 2018)
[Federal Register Volume 83, Number 177 (Wednesday, September 12, 2018)]
[Rules and Regulations]
[Pages 46101-46103]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2018-19752]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2016-4136; Special Conditions No. 25-621A-SC]


Special Conditions: The Boeing Company (Boeing), Model 777 Series 
Airplanes; Dynamic Test Requirements for Single Occupant Oblique Seats, 
With or Without Airbag Devices or 3-Point Restraints

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Amended final special conditions; request for comments.

-----------------------------------------------------------------------

SUMMARY: These amended special conditions are issued for the Boeing 
Model 777 series airplanes. This amendment states that the Boeing Model 
777 series airplanes oblique (side-facing) seats may be installed at an 
angle of 18 to 45 degrees to the airplane centerline and may include a 
3-point or airbag restraint system, or both, for occupant restraint and 
injury protection. This airplane will have novel or unusual design 
features when compared to the state of technology envisioned in the 
airworthiness standards for transport category airplanes. These design 
features are oblique (side-facing) single-occupant passenger seats 
equipped with or without airbag devices or 3-point restraints. The 
applicable airworthiness regulations do not contain adequate or 
appropriate safety standards for this design feature. These special 
conditions contain the additional safety standards that the 
Administrator considers necessary to establish a level of safety 
equivalent to that established by the existing airworthiness standards.

DATES: This action is effective on The Boeing Company on September 12, 
2018. Send comments on or before October 29, 2018.

ADDRESSES: Send comments identified by Docket No. FAA-2016-4136 using 
any of the following methods:
     Federal eRegulations Portal: Go to http://www.regulations.gov/ and follow the online instructions for sending 
your comments electronically.
     Mail: Send comments to Docket Operations, M-30, U.S. 
Department of Transportation (DOT), 1200 New Jersey Avenue SE, Room 
W12-140, West Building Ground Floor, Washington, DC 20590-0001.
     Hand Delivery or Courier: Take comments to Docket 
Operations in Room W12-140 of the West Building Ground Floor at 1200 
New Jersey Avenue SE, Washington, DC, between 9 a.m. and 5 p.m., Monday 
through Friday, except Federal holidays.
     Fax: Fax comments to Docket Operations at 202-493-2251.
    Privacy: The FAA will post all comments it receives, without 
change, to http://www.regulations.gov/, including any personal 
information the commenter provides. Using the search function of the 
docket website, anyone can find and read the electronic form of all 
comments received into any FAA docket, including the name of the 
individual sending the comment (or signing the comment for an 
association, business, labor union, etc.). DOT's complete Privacy Act 
Statement can be found in the Federal Register published on April 11, 
2000 (65 FR 19477-19478).
    Docket: Background documents or comments received may be read at 
http://www.regulations.gov/ at any time. Follow the online instructions 
for accessing the docket or go to Docket Operations in Room W12-140 of 
the West Building Ground Floor at 1200 New Jersey Avenue SE, 
Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, 
except Federal holidays.

FOR FURTHER INFORMATION CONTACT: John Shelden, Airframe and Cabin 
Safety Section, AIR-675, Transport Standards Branch, Policy and 
Innovation Division, Aircraft Certification Service, Federal Aviation 
Administration, 2200 South 216th Street, Des Moines, Washington 98198; 
telephone and fax 206-231-3214; email [email protected].

SUPPLEMENTARY INFORMATION: The substance of these special conditions 
has been published in the Federal Register for public comment in 
several prior instances with no substantive comments received. The FAA 
therefore finds it unnecessary to delay the effective date and finds 
that good cause exists for making these special conditions effective 
upon publication in the Federal Register.

Comments Invited

    We invite interested people to take part in this rulemaking by 
sending written comments, data, or views. The most helpful comments 
reference a specific portion of the special conditions, explain the 
reason for any recommended change, and include supporting data.
    We will consider all comments we receive by the closing date for 
comments. We may change these special conditions based on the comments 
we receive.

Background

    On November 22, 2017, Boeing applied for an amendment to Type

[[Page 46102]]

Certificate No. T00001SE for the installation of oblique (side-facing) 
passenger seats with or without airbag devices or 3-point restraints in 
the Boeing Model 777 series airplanes. The Boeing Model 777 series 
airplanes are twin-engine, transport category airplanes with a maximum 
certified passenger capacity of up to 550 and a maximum takeoff weight 
of approximately 775,000 lbs.

Type Certification Basis

    Under the provisions of title 14, Code of Federal Regulations (14 
CFR) 21.101, Boeing must show that the Model 777 series airplanes meet 
the applicable provisions of the regulations listed in Type Certificate 
No. T00001SE, or the applicable regulations in effect on the date of 
application for the change, except for earlier amendments as agreed 
upon by the FAA.
    If the Administrator finds that the applicable airworthiness 
regulations (i.e., 14 CFR part 25) do not contain adequate or 
appropriate safety standards for the Boeing Model 777 series airplanes 
because of novel or unusual design features, special conditions are 
prescribed under the provisions of Sec.  21.16.
    Special conditions are initially applicable to the model for which 
they are issued. Should the type certificate for that model be amended 
later to include any other model that incorporates the same novel or 
unusual design feature, or should any other model already included on 
the same type certificate be modified to incorporate the same novel or 
unusual design feature, these special conditions would also apply to 
the other model under Sec.  21.101.
    In addition to the applicable airworthiness regulations and special 
conditions, the Boeing Model 777 series airplanes must comply with the 
fuel vent and exhaust emission requirements of 14 CFR part 34 and the 
noise certification requirements of 14 CFR part 36.
    The FAA issues special conditions, as defined in 14 CFR 11.19, in 
accordance with Sec.  11.38, and they become part of the type 
certification basis under Sec.  21.101.

Novel or Unusual Design Features

    The business-class seating configuration Boeing proposes is novel 
or unusual due to the seat installation at 30 degrees to the airplane 
centerline, the airbag-system installation, and the seat/occupant 
interface with the surrounding furniture that introduces occupant 
alignment and loading concerns. The proposed business-class seating 
configuration is also beyond the limits of current acceptable 
equivalent-level-of-safety findings. These oblique (side-facing) seats 
may be installed at an angle of 18 to 45 degrees to the airplane 
centerline and may include a 3-point or airbag restraint system, or 
both, for occupant restraint and injury protection.
    The existing regulations do not provide adequate or appropriate 
safety standards for occupants of oblique-angled seats with airbag 
systems. To provide a level of safety that is equivalent to that 
afforded occupants of forward- and aft-facing seats, additional 
airworthiness standards, in the form of special conditions, are 
necessary. These special conditions supplement part 25 and, more 
specifically, supplement Sec. Sec.  25.562 and 25.785.
    The requirements contained in these special conditions consist of 
both test conditions and injury pass/fail criteria.

Discussion

    The FAA has been conducting and sponsoring research on appropriate 
injury criteria for oblique (side-facing) seat installations. However, 
the FAA research program is not complete and we may update these 
criteria as we obtain further research results. To reflect current 
research findings, the FAA issued policy statement PS-ANM-25-03-R1 to 
update injury criteria for fully side-facing seats, and policy 
statement PS-AIR-25-27, to define injury criteria for oblique (side-
facing) seats.
    The proposed Boeing Model 777 series airplanes business-class seat 
installation is novel such that the current Boeing Model 777 series 
airplanes certification basis does not adequately address protection of 
the occupant's neck and spine for seat configurations that are 
positioned at an angle greater than 18 degrees from the airplane 
centerline. The FAA issued special conditions No. 25-569-SC for Model 
777-300ER airplanes on September 25, 2014, and special conditions No. 
25-621-SC for certain Model 777-300ER airplanes on August 3rd, 2016. 
These special conditions contained injury criteria for oblique seats 
based on the best knowledge the FAA had at the time. These special 
conditions for oblique seat installations do not adequately address 
oblique seats, reflecting the current research results, with or without 
3-point or airbag restraint systems. Therefore, Boeing's proposed 
configuration will require amended special conditions.
    The installation of passenger seats at angles of 18 to 45 degrees 
to the airplane centerline are unique due to the seat/occupant 
interface with the surrounding furniture that introduces occupant 
alignment/loading concerns with or without the installation of a 3-
point or airbag restraint system, or both. On-going research has 
invalidated previously released special conditions for oblique (side-
facing) seat installations. These updated special conditions further 
address potential injuries to the occupant's neck and spine. As a 
result, these special conditions replace special conditions 25-569-SC 
and 25-621-SC.
    FAA-sponsored research has found that an un-restrained flailing of 
the upper torso, even when the pelvis and torso are nearly aligned, can 
produce serious spinal and torso injuries. At lower impact severities, 
even with significant misalignment between the torso and pelvis, these 
injuries did not occur. Tests with an FAA H-III anthropomorphic test 
device (ATD) have identified a level of lumbar spinal tension 
corresponding to the no-injury impact severity. This level of tension 
is included as a limit in the special conditions. The spine tension 
limit selected is conservative with respect to other aviation injury 
criteria since it corresponds to a no-injury loading condition.
    As noted in the special conditions for each airbag restraint 
system, because an airbag restraint system is essentially a single use 
device, there is the potential that it could deploy under crash 
conditions that are not sufficiently severe as to require head injury 
protection from the airbag restraint system. Since an actual crash is 
frequently composed of a series of impacts before the airplane comes to 
rest, this could render the airbag restraint system useless if a larger 
impact follows the initial impact. This situation does not exist with 
energy absorbing pads or upper torso restraints, which tend to provide 
protection according to the severity of the impact. Therefore, the 
installation of the airbag restraint system should be such that the 
airbag restraint system will provide protection when it is required, 
and will not expend its protection when it is not needed.
    Because these airbag restraint systems may or may not activate 
during various crash conditions, the injury criteria listed in these 
special conditions and in Sec.  25.562 must be met in an event that is 
slightly below the activation level of the airbag restraint system. If 
an airbag restraint system is included with the oblique seats, the 
system must meet the requirements in one of the airbag (inflatable 
restraint) special conditions applicable to the Boeing Model 777 series 
airplanes.

[[Page 46103]]

    These amended special conditions will provide head injury criteria, 
neck injury criteria, spine injury criteria, and body-to-wall contact 
criteria. They contain the additional safety standards that the 
Administrator considers necessary to establish a level of safety 
equivalent to that established by the existing airworthiness standards.

Applicability

    As discussed above, these special conditions are applicable to the 
Boeing Model 777 series airplane. Should Boeing apply at a later date 
for a change to the type certificate to include another model 
incorporating the same novel or unusual design feature, these special 
conditions would apply to that model as well.

Conclusion

    This action affects only certain novel or unusual design features 
on one model series of airplanes. It is not a rule of general 
applicability.

List of Subjects in 14 CFR Part 25

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements.

Authority Citation

    The authority citation for these special conditions is as follows:

    Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702, 44704.

The Special Conditions

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the following special conditions are issued as part of 
the type certification basis for the Boeing Model 777 series airplanes.

Side-Facing Seats Special Conditions

    In addition to the requirements of Sec.  25.562:

1. Head Injury Criteria (HIC)

    Compliance with Sec.  25.562(c)(5) is required, except that, if the 
ATD has no apparent contact with the seat/structure but has contact 
with an airbag, a HIC unlimited score in excess of 1,000 is acceptable, 
provided the HIC15 score for that contact (calculated in accordance 
with 49 CFR 571.208) is less than 700.

2. Body-to-Wall/Furnishing Contact

    If a seat is installed aft of structure (e.g., interior wall or 
furnishings) that does not provide a homogenous contact surface for the 
expected range of occupants and yaw angles, then additional analysis 
and tests may be required to demonstrate that the injury criteria are 
met for the area which an occupant could contact. For example, 
different yaw angles could result in different airbag device 
performance, then additional analysis or separate tests may be 
necessary to evaluate performance.

3. Neck Injury Criteria

    The seating system must protect the occupant from experiencing 
serious neck injury. The assessment of neck injury must be conducted 
with the airbag device activated, unless there is a reason to also 
consider that the neck-injury potential would be higher for impacts 
below the airbag-device deployment threshold.
    a. The Nij, calculated in accordance with 49 CFR 
571.208, must be below 1.0, where Nij = Fz/
Fzc + My/Myc, and Nij 
critical values are:

i. Fzc = 1,530 lbs for tension
ii. Fzc = 1,385 lbs for compression
iii. Myc = 229 lb-ft in flexion
iv. Myc = 100 lb-ft in extension
    b. In addition, peak upper-neck Fz must be below 937 
lbs. in tension and 899 lbs. in compression.
    c. Rotation of the head about its vertical axis, relative to the 
torso is limited to 105 degrees in either direction from forward-
facing.
    d. The neck must not impact any surface that would produce 
concentrated loading on the neck.

4. Spine and Torso Injury Criteria:

    a. The lumbar spine tension (Fz) cannot exceed 1,200 
lbs.
    b. Significant concentrated loading on the occupant's spine, in the 
area between the pelvis and shoulders during impact, including rebound, 
is not acceptable. During this type of contact, the interval for any 
rearward (X direction) acceleration exceeding 20 g must be less than 3 
milliseconds as measured by the thoracic instrumentation specified in 
49 CFR part 572, subpart E, filtered in accordance with SAE recommended 
practice J211/1, ``Instrumentation for Impact Test-Part 1--Electronic 
Instrumentation.''
    c. The occupant must not interact with the armrest or other seat 
components in any manner significantly different than would be expected 
for a forward-facing seat installation.

5. Pelvis Criteria

    Any part of the load-bearing portion of the bottom of the ATD 
pelvis must not translate beyond the edges of the seat bottom seat-
cushion supporting structure.

6. Femur Criteria

    Axial rotation of the upper leg (about the z-axis of the femur per 
SAE Recommended Practice J211/1) must be limited to 35 degrees from the 
nominal seated position. Evaluation during rebound does not need to be 
considered.

7. ATD and Test Conditions

    Longitudinal tests conducted to measure the injury criteria above 
must be performed with the FAA Hybrid III ATD, as described in SAE 
1999-01-1609, ``A Lumbar Spine Modification to the Hybrid III ATD for 
Aircraft Seat Tests.'' The tests must be conducted with an undeformed 
floor, at the most-critical yaw cases for injury, and with all lateral 
structural supports (e.g., armrests or walls) installed.

    Issued in Des Moines, Washington, on September 5, 2018.
Victor Wicklund,
Manager, Transport Standards Branch, Policy and Innovation Division, 
Aircraft Certification Service.
[FR Doc. 2018-19752 Filed 9-11-18; 8:45 am]
 BILLING CODE 4910-13-P



                                                          Federal Register / Vol. 83, No. 177 / Wednesday, September 12, 2018 / Rules and Regulations                                      46101

                                             5. Pelvis Criteria                                      DEPARTMENT OF TRANSPORTATION                          a.m. and 5 p.m., Monday through
                                                                                                                                                           Friday, except Federal holidays.
                                                Any part of the load-bearing portion                 Federal Aviation Administration                          • Fax: Fax comments to Docket
                                             of the bottom of the ATD pelvis must                                                                          Operations at 202–493–2251.
                                             not translate beyond the edges of the                   14 CFR Part 25                                           Privacy: The FAA will post all
                                             seat bottom seat-cushion supporting                                                                           comments it receives, without change,
                                                                                                     [Docket No. FAA–2016–4136; Special
                                             structure.                                              Conditions No. 25–621A–SC]                            to http://www.regulations.gov/,
                                                                                                                                                           including any personal information the
                                             6. Femur Criteria
                                                                                                     Special Conditions: The Boeing                        commenter provides. Using the search
                                               Axial rotation of the upper leg (about                Company (Boeing), Model 777 Series                    function of the docket website, anyone
                                             the z-axis of the femur per SAE                         Airplanes; Dynamic Test Requirements                  can find and read the electronic form of
                                             Recommended Practice J211/1) must be                    for Single Occupant Oblique Seats,                    all comments received into any FAA
                                             limited to 35 degrees from the nominal                  With or Without Airbag Devices or 3-                  docket, including the name of the
                                             seated position. Evaluation during                      Point Restraints                                      individual sending the comment (or
                                             rebound does not need to be considered.                                                                       signing the comment for an association,
                                                                                                     AGENCY: Federal Aviation
                                                                                                                                                           business, labor union, etc.). DOT’s
                                                                                                     Administration (FAA), DOT.
                                             7. ATD and Test Conditions                                                                                    complete Privacy Act Statement can be
                                                                                                     ACTION: Amended final special
                                                                                                                                                           found in the Federal Register published
                                                Longitudinal tests conducted to                      conditions; request for comments.                     on April 11, 2000 (65 FR 19477–19478).
                                             measure the injury criteria above must                                                                           Docket: Background documents or
                                                                                                     SUMMARY:   These amended special
                                             be performed with the FAA Hybrid III                    conditions are issued for the Boeing                  comments received may be read at
                                             ATD, as described in SAE 1999–01–                       Model 777 series airplanes. This                      http://www.regulations.gov/ at any time.
                                             1609, ‘‘A Lumbar Spine Modification to                  amendment states that the Boeing                      Follow the online instructions for
                                             the Hybrid III ATD for Aircraft Seat                    Model 777 series airplanes oblique                    accessing the docket or go to Docket
                                             Tests.’’ The tests must be conducted                    (side-facing) seats may be installed at an            Operations in Room W12–140 of the
                                             with an undeformed floor, at the most-                  angle of 18 to 45 degrees to the airplane             West Building Ground Floor at 1200
                                             critical yaw cases for injury, and with                 centerline and may include a 3-point or               New Jersey Avenue SE, Washington,
                                             all lateral structural supports (e.g.                   airbag restraint system, or both, for                 DC, between 9 a.m. and 5 p.m., Monday
                                             armrests or walls) installed.                           occupant restraint and injury protection.             through Friday, except Federal holidays.
                                                Note: Boeing must demonstrate that the               This airplane will have novel or                      FOR FURTHER INFORMATION CONTACT: John
                                             installation of seats via plinths or pallets            unusual design features when compared                 Shelden, Airframe and Cabin Safety
                                             meets all applicable requirements.                      to the state of technology envisioned in              Section, AIR–675, Transport Standards
                                             Compliance with the guidance contained in               the airworthiness standards for                       Branch, Policy and Innovation Division,
                                             policy memorandum PS–ANM–100–2000–                      transport category airplanes. These                   Aircraft Certification Service, Federal
                                             00123, ‘‘Guidance for Demonstrating                     design features are oblique (side-facing)             Aviation Administration, 2200 South
                                             Compliance with Seat Dynamic Testing for                single-occupant passenger seats                       216th Street, Des Moines, Washington
                                             Plinths and Pallets,’’ dated February 2, 2000,          equipped with or without airbag devices               98198; telephone and fax 206–231–
                                             is acceptable to the FAA.                               or 3-point restraints. The applicable                 3214; email John.Shelden@faa.gov.
                                                                                                     airworthiness regulations do not contain              SUPPLEMENTARY INFORMATION: The
                                             8. Inflatable Airbag Restraint Systems                  adequate or appropriate safety standards              substance of these special conditions
                                             Special Conditions                                      for this design feature. These special                has been published in the Federal
                                                                                                     conditions contain the additional safety              Register for public comment in several
                                               If inflatable airbag restraint systems                standards that the Administrator                      prior instances with no substantive
                                             are installed, the airbag systems must                  considers necessary to establish a level              comments received. The FAA therefore
                                             meet the requirements in one of the                     of safety equivalent to that established              finds it unnecessary to delay the
                                             airbag (inflatable restraint) special                   by the existing airworthiness standards.              effective date and finds that good cause
                                             conditions applicable to the Boeing                     DATES: This action is effective on The                exists for making these special
                                             Model 787–8, 787–9 and 787–10 series                    Boeing Company on September 12,                       conditions effective upon publication in
                                             airplanes.                                              2018. Send comments on or before                      the Federal Register.
                                               Issued in Des Moines, Washington, on                  October 29, 2018.
                                                                                                                                                           Comments Invited
                                             September 5, 2018.                                      ADDRESSES: Send comments identified
                                                                                                     by Docket No. FAA–2016–4136 using                       We invite interested people to take
                                             Victor Wicklund,
                                                                                                     any of the following methods:                         part in this rulemaking by sending
                                             Manager, Transport Standards Branch, Policy                • Federal eRegulations Portal: Go to               written comments, data, or views. The
                                             and Innovation Division, Aircraft                                                                             most helpful comments reference a
                                                                                                     http://www.regulations.gov/ and follow
                                             Certification Service.
                                                                                                     the online instructions for sending your              specific portion of the special
                                             [FR Doc. 2018–19753 Filed 9–11–18; 8:45 am]                                                                   conditions, explain the reason for any
                                                                                                     comments electronically.
                                             BILLING CODE 4910–13–P                                     • Mail: Send comments to Docket                    recommended change, and include
                                                                                                     Operations, M–30, U.S. Department of                  supporting data.
                                                                                                     Transportation (DOT), 1200 New Jersey                   We will consider all comments we
                                                                                                     Avenue SE, Room W12–140, West                         receive by the closing date for
daltland on DSKBBV9HB2PROD with RULES




                                                                                                     Building Ground Floor, Washington, DC                 comments. We may change these special
                                                                                                     20590–0001.                                           conditions based on the comments we
                                                                                                        • Hand Delivery or Courier: Take                   receive.
                                                                                                     comments to Docket Operations in
                                                                                                     Room W12–140 of the West Building                     Background
                                                                                                     Ground Floor at 1200 New Jersey                         On November 22, 2017, Boeing
                                                                                                     Avenue SE, Washington, DC, between 9                  applied for an amendment to Type


                                        VerDate Sep<11>2014   16:01 Sep 11, 2018   Jkt 244001   PO 00000   Frm 00033   Fmt 4700   Sfmt 4700   E:\FR\FM\12SER1.SGM   12SER1


                                             46102        Federal Register / Vol. 83, No. 177 / Wednesday, September 12, 2018 / Rules and Regulations

                                             Certificate No. T00001SE for the                        seating configuration is also beyond the              furniture that introduces occupant
                                             installation of oblique (side-facing)                   limits of current acceptable equivalent-              alignment/loading concerns with or
                                             passenger seats with or without airbag                  level-of-safety findings. These oblique               without the installation of a 3-point or
                                             devices or 3-point restraints in the                    (side-facing) seats may be installed at an            airbag restraint system, or both. On-
                                             Boeing Model 777 series airplanes. The                  angle of 18 to 45 degrees to the airplane             going research has invalidated
                                             Boeing Model 777 series airplanes are                   centerline and may include a 3-point or               previously released special conditions
                                             twin-engine, transport category                         airbag restraint system, or both, for                 for oblique (side-facing) seat
                                             airplanes with a maximum certified                      occupant restraint and injury protection.             installations. These updated special
                                             passenger capacity of up to 550 and a                      The existing regulations do not                    conditions further address potential
                                             maximum takeoff weight of                               provide adequate or appropriate safety                injuries to the occupant’s neck and
                                             approximately 775,000 lbs.                              standards for occupants of oblique-                   spine. As a result, these special
                                                                                                     angled seats with airbag systems. To                  conditions replace special conditions
                                             Type Certification Basis                                provide a level of safety that is                     25–569–SC and 25–621–SC.
                                                Under the provisions of title 14, Code               equivalent to that afforded occupants of                 FAA-sponsored research has found
                                             of Federal Regulations (14 CFR) 21.101,                 forward- and aft-facing seats, additional             that an un-restrained flailing of the
                                             Boeing must show that the Model 777                     airworthiness standards, in the form of               upper torso, even when the pelvis and
                                             series airplanes meet the applicable                    special conditions, are necessary. These              torso are nearly aligned, can produce
                                             provisions of the regulations listed in                 special conditions supplement part 25                 serious spinal and torso injuries. At
                                             Type Certificate No. T00001SE, or the                   and, more specifically, supplement                    lower impact severities, even with
                                             applicable regulations in effect on the                 §§ 25.562 and 25.785.                                 significant misalignment between the
                                             date of application for the change,                        The requirements contained in these                torso and pelvis, these injuries did not
                                             except for earlier amendments as agreed                 special conditions consist of both test               occur. Tests with an FAA H–III
                                             upon by the FAA.                                        conditions and injury pass/fail criteria.             anthropomorphic test device (ATD)
                                                If the Administrator finds that the                                                                        have identified a level of lumbar spinal
                                                                                                     Discussion
                                             applicable airworthiness regulations                                                                          tension corresponding to the no-injury
                                             (i.e., 14 CFR part 25) do not contain                     The FAA has been conducting and                     impact severity. This level of tension is
                                             adequate or appropriate safety standards                sponsoring research on appropriate                    included as a limit in the special
                                             for the Boeing Model 777 series                         injury criteria for oblique (side-facing)             conditions. The spine tension limit
                                             airplanes because of novel or unusual                   seat installations. However, the FAA                  selected is conservative with respect to
                                             design features, special conditions are                 research program is not complete and                  other aviation injury criteria since it
                                             prescribed under the provisions of                      we may update these criteria as we                    corresponds to a no-injury loading
                                             § 21.16.                                                obtain further research results. To                   condition.
                                                Special conditions are initially                     reflect current research findings, the                   As noted in the special conditions for
                                             applicable to the model for which they                  FAA issued policy statement PS–ANM–                   each airbag restraint system, because an
                                             are issued. Should the type certificate                 25–03–R1 to update injury criteria for                airbag restraint system is essentially a
                                             for that model be amended later to                      fully side-facing seats, and policy                   single use device, there is the potential
                                             include any other model that                            statement PS–AIR–25–27, to define                     that it could deploy under crash
                                             incorporates the same novel or unusual                  injury criteria for oblique (side-facing)             conditions that are not sufficiently
                                             design feature, or should any other                     seats.                                                severe as to require head injury
                                             model already included on the same                        The proposed Boeing Model 777                       protection from the airbag restraint
                                             type certificate be modified to                         series airplanes business-class seat                  system. Since an actual crash is
                                             incorporate the same novel or unusual                   installation is novel such that the                   frequently composed of a series of
                                             design feature, these special conditions                current Boeing Model 777 series                       impacts before the airplane comes to
                                             would also apply to the other model                     airplanes certification basis does not                rest, this could render the airbag
                                             under § 21.101.                                         adequately address protection of the                  restraint system useless if a larger
                                                In addition to the applicable                        occupant’s neck and spine for seat                    impact follows the initial impact. This
                                             airworthiness regulations and special                   configurations that are positioned at an              situation does not exist with energy
                                             conditions, the Boeing Model 777 series                 angle greater than 18 degrees from the                absorbing pads or upper torso restraints,
                                             airplanes must comply with the fuel                     airplane centerline. The FAA issued                   which tend to provide protection
                                             vent and exhaust emission requirements                  special conditions No. 25–569–SC for                  according to the severity of the impact.
                                             of 14 CFR part 34 and the noise                         Model 777–300ER airplanes on                          Therefore, the installation of the airbag
                                             certification requirements of 14 CFR                    September 25, 2014, and special                       restraint system should be such that the
                                             part 36.                                                conditions No. 25–621–SC for certain                  airbag restraint system will provide
                                                The FAA issues special conditions, as                Model 777–300ER airplanes on August                   protection when it is required, and will
                                             defined in 14 CFR 11.19, in accordance                  3rd, 2016. These special conditions                   not expend its protection when it is not
                                             with § 11.38, and they become part of                   contained injury criteria for oblique                 needed.
                                             the type certification basis under                      seats based on the best knowledge the                    Because these airbag restraint systems
                                             § 21.101.                                               FAA had at the time. These special                    may or may not activate during various
                                                                                                     conditions for oblique seat installations             crash conditions, the injury criteria
                                             Novel or Unusual Design Features                        do not adequately address oblique seats,              listed in these special conditions and in
                                                The business-class seating                           reflecting the current research results,              § 25.562 must be met in an event that is
                                             configuration Boeing proposes is novel                  with or without 3-point or airbag                     slightly below the activation level of the
                                             or unusual due to the seat installation                                                                       airbag restraint system. If an airbag
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                                                                                                     restraint systems. Therefore, Boeing’s
                                             at 30 degrees to the airplane centerline,               proposed configuration will require                   restraint system is included with the
                                             the airbag-system installation, and the                 amended special conditions.                           oblique seats, the system must meet the
                                             seat/occupant interface with the                          The installation of passenger seats at              requirements in one of the airbag
                                             surrounding furniture that introduces                   angles of 18 to 45 degrees to the airplane            (inflatable restraint) special conditions
                                             occupant alignment and loading                          centerline are unique due to the seat/                applicable to the Boeing Model 777
                                             concerns. The proposed business-class                   occupant interface with the surrounding               series airplanes.


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                                                          Federal Register / Vol. 83, No. 177 / Wednesday, September 12, 2018 / Rules and Regulations                                              46103

                                               These amended special conditions                      criteria are met for the area which an                6. Femur Criteria
                                             will provide head injury criteria, neck                 occupant could contact. For example,                    Axial rotation of the upper leg (about
                                             injury criteria, spine injury criteria, and             different yaw angles could result in                  the z-axis of the femur per SAE
                                             body-to-wall contact criteria. They                     different airbag device performance,                  Recommended Practice J211/1) must be
                                             contain the additional safety standards                 then additional analysis or separate tests            limited to 35 degrees from the nominal
                                             that the Administrator considers                        may be necessary to evaluate                          seated position. Evaluation during
                                             necessary to establish a level of safety                performance.                                          rebound does not need to be considered.
                                             equivalent to that established by the
                                                                                                     3. Neck Injury Criteria                               7. ATD and Test Conditions
                                             existing airworthiness standards.
                                                                                                        The seating system must protect the
                                             Applicability                                                                                                    Longitudinal tests conducted to
                                                                                                     occupant from experiencing serious
                                                                                                                                                           measure the injury criteria above must
                                               As discussed above, these special                     neck injury. The assessment of neck
                                                                                                                                                           be performed with the FAA Hybrid III
                                             conditions are applicable to the Boeing                 injury must be conducted with the
                                                                                                                                                           ATD, as described in SAE 1999–01–
                                             Model 777 series airplane. Should                       airbag device activated, unless there is
                                                                                                                                                           1609, ‘‘A Lumbar Spine Modification to
                                             Boeing apply at a later date for a change               a reason to also consider that the neck-
                                                                                                                                                           the Hybrid III ATD for Aircraft Seat
                                             to the type certificate to include another              injury potential would be higher for
                                                                                                                                                           Tests.’’ The tests must be conducted
                                             model incorporating the same novel or                   impacts below the airbag-device
                                                                                                                                                           with an undeformed floor, at the most-
                                             unusual design feature, these special                   deployment threshold.
                                                                                                                                                           critical yaw cases for injury, and with
                                             conditions would apply to that model as                    a. The Nij, calculated in accordance
                                                                                                                                                           all lateral structural supports (e.g.,
                                             well.                                                   with 49 CFR 571.208, must be below
                                                                                                                                                           armrests or walls) installed.
                                                                                                     1.0, where Nij = Fz/Fzc + My/Myc, and Nij
                                             Conclusion                                              critical values are:                                    Issued in Des Moines, Washington, on
                                               This action affects only certain novel                                                                      September 5, 2018.
                                                                                                     i. Fzc = 1,530 lbs for tension
                                             or unusual design features on one model                 ii. Fzc = 1,385 lbs for compression                   Victor Wicklund,
                                             series of airplanes. It is not a rule of                iii. Myc = 229 lb-ft in flexion                       Manager, Transport Standards Branch, Policy
                                             general applicability.                                  iv. Myc = 100 lb-ft in extension                      and Innovation Division, Aircraft
                                                                                                       b. In addition, peak upper-neck Fz                  Certification Service.
                                             List of Subjects in 14 CFR Part 25
                                                                                                     must be below 937 lbs. in tension and                 [FR Doc. 2018–19752 Filed 9–11–18; 8:45 am]
                                               Aircraft, Aviation safety, Reporting                  899 lbs. in compression.                              BILLING CODE 4910–13–P
                                             and recordkeeping requirements.                           c. Rotation of the head about its
                                             Authority Citation                                      vertical axis, relative to the torso is
                                                                                                     limited to 105 degrees in either
                                               The authority citation for these                      direction from forward-facing.                        DEPARTMENT OF COMMERCE
                                             special conditions is as follows:                         d. The neck must not impact any
                                                                                                     surface that would produce                            Bureau of Industry and Security
                                               Authority: 49 U.S.C. 106(f), 106(g), 40113,
                                             44701, 44702, 44704.                                    concentrated loading on the neck.
                                                                                                                                                           15 CFR Part 744
                                             The Special Conditions                                  4. Spine and Torso Injury Criteria:
                                               Accordingly, pursuant to the                             a. The lumbar spine tension (Fz)                   [Docket No. 180718671–8671–01]
                                             authority delegated to me by the                        cannot exceed 1,200 lbs.
                                             Administrator, the following special                       b. Significant concentrated loading on             RIN 0694–AH57
                                             conditions are issued as part of the type               the occupant’s spine, in the area
                                                                                                     between the pelvis and shoulders                      Addition of Certain Entities to the
                                             certification basis for the Boeing Model                                                                      Entity List, Revision of Entries on the
                                             777 series airplanes.                                   during impact, including rebound, is
                                                                                                     not acceptable. During this type of                   Entity List and Removal of Certain
                                             Side-Facing Seats Special Conditions                    contact, the interval for any rearward (X             Entities From the Entity List
                                               In addition to the requirements of                    direction) acceleration exceeding 20 g                Correction
                                             § 25.562:                                               must be less than 3 milliseconds as
                                                                                                     measured by the thoracic                                In rule document 2018–18766
                                             1. Head Injury Criteria (HIC)                                                                                 beginning on page 44821 in the issue of
                                                                                                     instrumentation specified in 49 CFR
                                               Compliance with § 25.562(c)(5) is                     part 572, subpart E, filtered in                      Tuesday, September 4, 2018, make the
                                             required, except that, if the ATD has no                accordance with SAE recommended                       following correction:
                                             apparent contact with the seat/structure                practice J211/1, ‘‘Instrumentation for                  1. On page 44824, in the third
                                             but has contact with an airbag, a HIC                   Impact Test–Part 1—Electronic                         column, amendatory instruction number
                                             unlimited score in excess of 1,000 is                   Instrumentation.’’                                    2e is corrected to read as follows:
                                             acceptable, provided the HIC15 score for                   c. The occupant must not interact                    ‘‘2. * * *
                                             that contact (calculated in accordance                  with the armrest or other seat                          e. Under Russia,
                                             with 49 CFR 571.208) is less than 700.                  components in any manner significantly                  i. By removing the entity ‘‘Joint Stock
                                                                                                     different than would be expected for a                Company Mikron’’;
                                             2. Body-to-Wall/Furnishing Contact                                                                              ii. By adding in alphabetical order
                                                                                                     forward-facing seat installation.
                                                If a seat is installed aft of structure                                                                    two entities ‘‘Joint Stock Company (JSC)
                                             (e.g., interior wall or furnishings) that               5. Pelvis Criteria                                    NIIME’’ and ‘‘PJSC Mikron’’;
                                             does not provide a homogenous contact                      Any part of the load-bearing portion                 2. On page 44825, in the table, under
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                                             surface for the expected range of                       of the bottom of the ATD pelvis must                  the country heading for Hong Kong, the
                                             occupants and yaw angles, then                          not translate beyond the edges of the                 Joinus Freight Systems entry should
                                             additional analysis and tests may be                    seat bottom seat-cushion supporting                   read as follows:
                                             required to demonstrate that the injury                 structure.                                            *      *    *     *     *




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Document Created: 2018-09-12 02:06:34
Document Modified: 2018-09-12 02:06:34
CategoryRegulatory Information
CollectionFederal Register
sudoc ClassAE 2.7:
GS 4.107:
AE 2.106:
PublisherOffice of the Federal Register, National Archives and Records Administration
SectionRules and Regulations
ActionAmended final special conditions; request for comments.
DatesThis action is effective on The Boeing Company on September 12, 2018. Send comments on or before October 29, 2018.
ContactJohn Shelden, Airframe and Cabin Safety Section, AIR-675, Transport Standards Branch, Policy and Innovation Division, Aircraft Certification Service, Federal Aviation Administration, 2200 South 216th Street, Des Moines, Washington 98198; telephone and fax 206-231-3214; email [email protected]
FR Citation83 FR 46101 
CFR AssociatedAircraft; Aviation Safety and Reporting and Recordkeeping Requirements

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