82_FR_22156 82 FR 22065 - Special Conditions: Bombardier Aerospace, Model BD-700-2A12 and BD-700-2A13 Airplanes; Limit Engine Torque Loads

82 FR 22065 - Special Conditions: Bombardier Aerospace, Model BD-700-2A12 and BD-700-2A13 Airplanes; Limit Engine Torque Loads

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 82, Issue 91 (May 12, 2017)

Page Range22065-22066
FR Document2017-09663

These special conditions are issued for the Bombardier (Bombardier) Inc. Models BD-700-2A12 and BD-700-2A13 airplanes. This airplane will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transport-category airplanes. This design feature is the engine torque- load limit imposed by sudden engine stoppage due to malfunction or structural failure. 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 82 Issue 91 (Friday, May 12, 2017)
[Federal Register Volume 82, Number 91 (Friday, May 12, 2017)]
[Rules and Regulations]
[Pages 22065-22066]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2017-09663]



========================================================================
Rules and Regulations
                                                Federal Register
________________________________________________________________________

This section of the FEDERAL REGISTER contains regulatory documents 
having general applicability and legal effect, most of which are keyed 
to and codified in the Code of Federal Regulations, which is published 
under 50 titles pursuant to 44 U.S.C. 1510.

The Code of Federal Regulations is sold by the Superintendent of Documents. 

========================================================================


Federal Register / Vol. 82, No. 91 / Friday, May 12, 2017 / Rules and 
Regulations

[[Page 22065]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2017-0033; Special Conditions No. 25-670-SC]


Special Conditions: Bombardier Aerospace, Model BD-700-2A12 and 
BD-700-2A13 Airplanes; Limit Engine Torque Loads

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions; request for comments.

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

SUMMARY: These special conditions are issued for the Bombardier 
(Bombardier) Inc. Models BD-700-2A12 and BD-700-2A13 airplanes. This 
airplane will have a novel or unusual design feature when compared to 
the state of technology envisioned in the airworthiness standards for 
transport-category airplanes. This design feature is the engine torque-
load limit imposed by sudden engine stoppage due to malfunction or 
structural failure. 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 Bombardier on May 12, 2017. Send 
your comments on or before June 26, 2017.

ADDRESSES: Send comments identified by docket number FAA-2017-0033 
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 8 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 Web site, 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 the 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: Mark Freisthler, FAA, Airframe and 
Cabin Safety Branch, ANM-115, Transport Airplane Directorate, Aircraft 
Certification Service, 1601 Lind Avenue SW., Renton, Washington 98057-
3356; telephone 425-227-1119; facsimile 425-227-1232.

SUPPLEMENTARY INFORMATION: The substance of these special conditions 
has been subject to the public notice and comment period in several 
prior instances, and has been derived without substantive change from 
those previously issued. It is unlikely that prior public comment would 
result in a significant change from the substance contained herein. 
Therefore, the FAA has determined that prior public notice and comment 
are unnecessary and impracticable, and good cause exists for adopting 
these special conditions upon issuance. The FAA is requesting comments 
to allow interested persons to submit views that may not have been 
submitted in response to the prior opportunities for comment described 
above. It is further unnecessary to delay the effective date for the 
reasons previously stated.

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 on or before the closing 
date for comments. We may change these special conditions based on the 
comments we receive.

Background

    On May 30, 2012, Bombardier applied for an amendment to Type 
Certificate No. T00003NY to include the new Model BD-700-2A12 and BD-
700-2A13 airplanes. These airplanes are derivatives of the Model BD-700 
series of airplanes and are marketed as the Bombardier Global 7000 
(Model BD-700-2A12) and Global 8000 (Model BD-700-2A13). These 
airplanes are twin-engine, transport-category, executive-interior 
business jets. The maximum passenger capacity is 19 and the maximum 
takeoff weights are 106,250 lbs. (Model BD-700-2A12) and 104,800 lbs. 
(Model BD-700-2A13).

Type Certification Basis

    Under the provisions of Title 14, Code of Federal Regulations (14 
CFR) 21.101, Bombardier must show that the Model BD-700-2A12 and BD-
700-2A13 airplanes meet the applicable provisions of the regulations 
listed in Type Certificate No. T00003NY, 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 Model BD-700-2A12 and BD-700-2A13 
airplanes because of a novel or unusual design feature, 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

[[Page 22066]]

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 Model BD-700-2A12 and BD-700-2A13 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 Feature

    The Bombardier Model BD-700-2A12 and BD-700-2A13 airplanes will 
incorporate a novel or unusual design feature associated with engine-
seizure requirements due, in part, to large bypass fans capable of 
producing much larger and more complex dynamic loads than would other 
bypass fans.

Discussion

    The limit engine torque load imposed by sudden engine stoppage due 
to malfunction or structural failure (such as compressor jamming) has 
been a specific requirement for transport-category airplanes since 
1957. In the past, the design torque loads associated with typical 
failure scenarios have been estimated by the engine manufacturer and 
provided to the airframe manufacturer as limit loads. These limit loads 
were considered simple, pure, torque static loads.
    It is evident from service history that the engine-failure events 
that tend to cause the most severe loads are fan-blade failures. These 
events occur much less frequently than the typical ``limit'' load 
condition.
    Regulatory authorities and industry have developed a standardized 
requirement in the Aviation Rulemaking Advisory Committee (ARAC) forum 
(Aviation Rulemaking Advisory Committee; Loads and Dynamics 
Harmonization Working Group [58 FR 13819]). The technical aspects of 
this requirement have been agreed upon, and the ARAC Loads and Dynamics 
Harmonization Working Group has accepted them. These special conditions 
reflect the ARAC recommendation. The ARAC recommendation includes 
corresponding advisory material, which is considered an acceptable 
means of compliance to these special conditions.
    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.

Applicability

    As discussed above, these special conditions are applicable to the 
Model BD-700-2A12 and BD-700-2A13 airplanes. Should Bombardier 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 the other model as well.

Conclusion

    This action affects only one novel or unusual design feature on 
Bombardier Model BD-700-2A12 and BD-700-2A13 airplanes. It is not a 
rule of general applicability and affects only the applicant who 
applied to FAA for approval of this feature on the airplane.

List of Subjects in 14 CFR Part 25

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements.


0
The authority citation for these special conditions is as follows:

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

The Proposed Special Conditions

0
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 Bombardier Model BD-700-2A12 and BD-
700-2A13 airplanes.
    In lieu of Sec.  25.361(b) the following special conditions apply:
    1. For turbine engine installations, the engine mounts, pylons, and 
adjacent supporting airframe structure must be designed to withstand 1g 
level flight loads acting simultaneously with the maximum limit torque 
loads imposed by each of the following:
    a. Sudden engine deceleration due to a malfunction that could 
result in a temporary loss of power or thrust, and
    b. The maximum acceleration of the engine.
    2. For auxiliary power unit (APU) installations, the power unit 
mounts and adjacent supporting airframe structure must be designed to 
withstand 1g level flight loads acting simultaneously with the maximum 
limit torque loads imposed by each of the following:
    a. Sudden APU deceleration due to malfunction or structural 
failure; and
    b. The maximum acceleration of the APU.
    3. For engine supporting structure, an ultimate loading condition 
must be considered that combines 1g flight loads with the transient 
dynamic loads resulting from:
    a. The loss of any fan, compressor, or turbine blade; and 
separately
    b. Where applicable to a specific engine design, any other engine 
structural failure that results in higher loads.
    4. The ultimate loads developed from the conditions specified in 
paragraphs 3(a) and 3(b) of these special conditions are to be 
multiplied by a factor of 1.0 when applied to engine mounts and pylons, 
and multiplied by a factor of 1.25 when applied to adjacent supporting 
airframe structure.
    5. Any permanent deformation that results from the conditions 
specified in paragraph 3 must not prevent continued safe flight and 
landing.

    Issued in Renton, Washington, on April 27, 2017.
Paul Bernado,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2017-09663 Filed 5-11-17; 8:45 am]
 BILLING CODE 4910-13-P



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                                                Rules and Regulations                                                                                         Federal Register
                                                                                                                                                              Vol. 82, No. 91

                                                                                                                                                              Friday, May 12, 2017



                                                This section of the FEDERAL REGISTER                    Building Ground Floor, Washington, DC                 opportunities for comment described
                                                contains regulatory documents having general            20590–0001.                                           above. It is further unnecessary to delay
                                                applicability and legal effect, most of which              • Hand Delivery or Courier: Take                   the effective date for the reasons
                                                are keyed to and codified in the Code of                comments to Docket Operations in                      previously stated.
                                                Federal Regulations, which is published under           Room W12–140 of the West Building
                                                50 titles pursuant to 44 U.S.C. 1510.                                                                         Comments Invited
                                                                                                        Ground Floor at 1200 New Jersey
                                                The Code of Federal Regulations is sold by              Avenue SE., Washington, DC, between 8                   We invite interested people to take
                                                the Superintendent of Documents.                        a.m. and 5 p.m., Monday through                       part in this rulemaking by sending
                                                                                                        Friday, except federal holidays.                      written comments, data, or views. The
                                                                                                           • Fax: Fax comments to Docket                      most helpful comments reference a
                                                DEPARTMENT OF TRANSPORTATION                            Operations at 202–493–2251.                           specific portion of the special
                                                                                                           Privacy: The FAA will post all                     conditions, explain the reason for any
                                                Federal Aviation Administration                         comments it receives, without change,                 recommended change, and include
                                                                                                        to http://www.regulations.gov/,                       supporting data.
                                                14 CFR Part 25                                          including any personal information the                  We will consider all comments we
                                                [Docket No. FAA–2017–0033; Special                      commenter provides. Using the search                  receive on or before the closing date for
                                                Conditions No. 25–670–SC]                               function of the docket Web site, anyone               comments. We may change these special
                                                                                                        can find and read the electronic form of              conditions based on the comments we
                                                Special Conditions: Bombardier                          all comments received into any FAA                    receive.
                                                Aerospace, Model BD–700–2A12 and                        docket, including the name of the                     Background
                                                BD–700–2A13 Airplanes; Limit Engine                     individual sending the comment (or
                                                Torque Loads                                            signing the comment for an association,                 On May 30, 2012, Bombardier applied
                                                                                                        business, labor union, etc.). DOT’s                   for an amendment to Type Certificate
                                                AGENCY:  Federal Aviation                                                                                     No. T00003NY to include the new
                                                Administration (FAA), DOT.                              complete Privacy Act Statement can be
                                                                                                        found in the Federal Register published               Model BD–700–2A12 and BD–700–
                                                ACTION: Final special conditions; request                                                                     2A13 airplanes. These airplanes are
                                                                                                        on April 11, 2000 (65 FR 19477–19478).
                                                for comments.                                              Docket: Background documents or                    derivatives of the Model BD–700 series
                                                                                                        comments received may be read at                      of airplanes and are marketed as the
                                                SUMMARY:   These special conditions are                                                                       Bombardier Global 7000 (Model BD–
                                                issued for the Bombardier (Bombardier)                  http://www.regulations.gov/ at any time.
                                                                                                        Follow the online instructions for                    700–2A12) and Global 8000 (Model BD–
                                                Inc. Models BD–700–2A12 and BD–                                                                               700–2A13). These airplanes are twin-
                                                700–2A13 airplanes. This airplane will                  accessing the docket or go to the Docket
                                                                                                        Operations in Room W12–140 of the                     engine, transport-category, executive-
                                                have a novel or unusual design feature                                                                        interior business jets. The maximum
                                                when compared to the state of                           West Building Ground Floor at 1200
                                                                                                        New Jersey Avenue SE., Washington,                    passenger capacity is 19 and the
                                                technology envisioned in the                                                                                  maximum takeoff weights are 106,250
                                                airworthiness standards for transport-                  DC, between 9 a.m. and 5 p.m., Monday
                                                                                                        through Friday, except federal holidays.              lbs. (Model BD–700–2A12) and 104,800
                                                category airplanes. This design feature                                                                       lbs. (Model BD–700–2A13).
                                                is the engine torque-load limit imposed                 FOR FURTHER INFORMATION CONTACT:
                                                by sudden engine stoppage due to                        Mark Freisthler, FAA, Airframe and                    Type Certification Basis
                                                malfunction or structural failure. The                  Cabin Safety Branch, ANM–115,                            Under the provisions of Title 14, Code
                                                applicable airworthiness regulations do                 Transport Airplane Directorate, Aircraft              of Federal Regulations (14 CFR) 21.101,
                                                not contain adequate or appropriate                     Certification Service, 1601 Lind Avenue               Bombardier must show that the Model
                                                safety standards for this design feature.               SW., Renton, Washington 98057–3356;                   BD–700–2A12 and BD–700–2A13
                                                These special conditions contain the                    telephone 425–227–1119; facsimile                     airplanes meet the applicable provisions
                                                additional safety standards that the                    425–227–1232.                                         of the regulations listed in Type
                                                Administrator considers necessary to                    SUPPLEMENTARY INFORMATION: The                        Certificate No. T00003NY, or the
                                                establish a level of safety equivalent to               substance of these special conditions                 applicable regulations in effect on the
                                                that established by the existing                        has been subject to the public notice                 date of application for the change,
                                                airworthiness standards.                                and comment period in several prior                   except for earlier amendments as agreed
                                                DATES: This action is effective on                      instances, and has been derived without               upon by the FAA.
                                                Bombardier on May 12, 2017. Send your                   substantive change from those                            If the Administrator finds that the
                                                comments on or before June 26, 2017.                    previously issued. It is unlikely that                applicable airworthiness regulations
                                                ADDRESSES: Send comments identified                     prior public comment would result in a                (i.e., 14 CFR part 25) do not contain
                                                by docket number FAA–2017–0033                          significant change from the substance                 adequate or appropriate safety standards
                                                using any of the following methods:                     contained herein. Therefore, the FAA                  for the Model BD–700–2A12 and BD–
                                                   • Federal eRegulations Portal: Go to                 has determined that prior public notice               700–2A13 airplanes because of a novel
mstockstill on DSK30JT082PROD with RULES




                                                http://www.regulations.gov/ and follow                  and comment are unnecessary and                       or unusual design feature, special
                                                the online instructions for sending your                impracticable, and good cause exists for              conditions are prescribed under the
                                                comments electronically.                                adopting these special conditions upon                provisions of § 21.16.
                                                   • Mail: Send comments to Docket                      issuance. The FAA is requesting                          Special conditions are initially
                                                Operations, M–30, U.S. Department of                    comments to allow interested persons to               applicable to the model for which they
                                                Transportation (DOT), 1200 New Jersey                   submit views that may not have been                   are issued. Should the type certificate
                                                Avenue SE., Room W12–140, West                          submitted in response to the prior                    for that model be amended later to


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                                                22066                 Federal Register / Vol. 82, No. 91 / Friday, May 12, 2017 / Rules and Regulations

                                                include any other model that                            is considered an acceptable means of                     b. The maximum acceleration of the
                                                incorporates the same novel or unusual                  compliance to these special conditions.               APU.
                                                design feature, or should any other                        These special conditions contain the                  3. For engine supporting structure, an
                                                model already included on the same                      additional safety standards that the                  ultimate loading condition must be
                                                type certificate be modified to                         Administrator considers necessary to                  considered that combines 1g flight loads
                                                incorporate the same novel or unusual                   establish a level of safety equivalent to             with the transient dynamic loads
                                                design feature, these special conditions                that established by the existing                      resulting from:
                                                would also apply to the other model                     airworthiness standards.                                 a. The loss of any fan, compressor, or
                                                under § 21.101.                                                                                               turbine blade; and separately
                                                                                                        Applicability
                                                  In addition to the applicable                                                                                  b. Where applicable to a specific
                                                airworthiness regulations and special                      As discussed above, these special                  engine design, any other engine
                                                conditions, the Model BD–700–2A12                       conditions are applicable to the Model                structural failure that results in higher
                                                and BD–700–2A13 airplanes must                          BD–700–2A12 and BD–700–2A13                           loads.
                                                comply with the fuel-vent and exhaust-                  airplanes. Should Bombardier apply at a                  4. The ultimate loads developed from
                                                emission requirements of 14 CFR part                    later date for a change to the type                   the conditions specified in paragraphs
                                                34, and the noise-certification                         certificate to include another model                  3(a) and 3(b) of these special conditions
                                                requirements of 14 CFR part 36.                         incorporating the same novel or unusual               are to be multiplied by a factor of 1.0
                                                  The FAA issues special conditions, as                 design feature, these special conditions              when applied to engine mounts and
                                                defined in 14 CFR 11.19, in accordance                  would apply to the other model as well.               pylons, and multiplied by a factor of
                                                with § 11.38, and they become part of                   Conclusion                                            1.25 when applied to adjacent
                                                the type certification basis under                                                                            supporting airframe structure.
                                                § 21.101.                                                 This action affects only one novel or                  5. Any permanent deformation that
                                                                                                        unusual design feature on Bombardier                  results from the conditions specified in
                                                Novel or Unusual Design Feature                         Model BD–700–2A12 and BD–700–                         paragraph 3 must not prevent continued
                                                  The Bombardier Model BD–700–2A12                      2A13 airplanes. It is not a rule of general           safe flight and landing.
                                                and BD–700–2A13 airplanes will                          applicability and affects only the
                                                                                                                                                                Issued in Renton, Washington, on April 27,
                                                incorporate a novel or unusual design                   applicant who applied to FAA for                      2017.
                                                feature associated with engine-seizure                  approval of this feature on the airplane.
                                                                                                                                                              Paul Bernado,
                                                requirements due, in part, to large                     List of Subjects in 14 CFR Part 25                    Acting Manager, Transport Airplane
                                                bypass fans capable of producing much                                                                         Directorate, Aircraft Certification Service.
                                                larger and more complex dynamic loads                     Aircraft, Aviation safety, Reporting
                                                                                                        and recordkeeping requirements.                       [FR Doc. 2017–09663 Filed 5–11–17; 8:45 am]
                                                than would other bypass fans.                                                                                 BILLING CODE 4910–13–P
                                                                                                        ■ The authority citation for these
                                                Discussion
                                                                                                        special conditions is as follows:
                                                  The limit engine torque load imposed                    Authority: 49 U.S.C. 106(g), 40113, 44701,          DEPARTMENT OF TRANSPORTATION
                                                by sudden engine stoppage due to                        44702, 44704.
                                                malfunction or structural failure (such                                                                       Federal Aviation Administration
                                                as compressor jamming) has been a                       The Proposed Special Conditions
                                                specific requirement for transport-                     ■ Accordingly, pursuant to the authority              14 CFR Part 25
                                                category airplanes since 1957. In the                   delegated to me by the Administrator,
                                                past, the design torque loads associated                the following special conditions are                  [Docket No. FAA–2017–0358; Special
                                                with typical failure scenarios have been                issued as part of the type certification              Conditions No. 25–659–SC]
                                                estimated by the engine manufacturer                    basis for Bombardier Model BD–700–
                                                and provided to the airframe                                                                                  Special Conditions: Bombardier
                                                                                                        2A12 and BD–700–2A13 airplanes.
                                                manufacturer as limit loads. These limit                                                                      Aerospace Inc., Model BD–100–1A10
                                                                                                           In lieu of § 25.361(b) the following
                                                loads were considered simple, pure,                                                                           Airplane; Non-Rechargeable Lithium
                                                                                                        special conditions apply:
                                                torque static loads.                                                                                          Battery Installations
                                                                                                           1. For turbine engine installations, the
                                                  It is evident from service history that               engine mounts, pylons, and adjacent                   AGENCY:  Federal Aviation
                                                the engine-failure events that tend to                  supporting airframe structure must be                 Administration (FAA), DOT.
                                                cause the most severe loads are fan-                    designed to withstand 1g level flight                 ACTION: Final special conditions; request
                                                blade failures. These events occur much                 loads acting simultaneously with the                  for comment.
                                                less frequently than the typical ‘‘limit’’              maximum limit torque loads imposed
                                                load condition.                                         by each of the following:                             SUMMARY:    These special conditions are
                                                  Regulatory authorities and industry                      a. Sudden engine deceleration due to               issued for non-rechargeable lithium
                                                have developed a standardized                           a malfunction that could result in a                  battery installations on the Bombardier
                                                requirement in the Aviation Rulemaking                  temporary loss of power or thrust, and                Aerospace Inc. (Bombardier) Model BD–
                                                Advisory Committee (ARAC) forum                            b. The maximum acceleration of the                 100–1A10 airplane. Non-rechargeable
                                                (Aviation Rulemaking Advisory                           engine.                                               lithium batteries are a novel or unusual
                                                Committee; Loads and Dynamics                              2. For auxiliary power unit (APU)                  design feature when compared to the
                                                Harmonization Working Group [58 FR                      installations, the power unit mounts                  state of technology envisioned in the
                                                13819]). The technical aspects of this                  and adjacent supporting airframe                      airworthiness standards for transport
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                                                requirement have been agreed upon,                      structure must be designed to withstand               category airplanes. The applicable
                                                and the ARAC Loads and Dynamics                         1g level flight loads acting                          airworthiness regulations do not contain
                                                Harmonization Working Group has                         simultaneously with the maximum limit                 adequate or appropriate safety standards
                                                accepted them. These special conditions                 torque loads imposed by each of the                   for this design feature. These special
                                                reflect the ARAC recommendation. The                    following:                                            conditions contain the additional safety
                                                ARAC recommendation includes                               a. Sudden APU deceleration due to                  standards that the Administrator
                                                corresponding advisory material, which                  malfunction or structural failure; and                considers necessary to establish a level


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Document Created: 2017-05-12 01:08:56
Document Modified: 2017-05-12 01:08:56
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
ActionFinal special conditions; request for comments.
DatesThis action is effective on Bombardier on May 12, 2017. Send your comments on or before June 26, 2017.
ContactMark Freisthler, FAA, Airframe and Cabin Safety Branch, ANM-115, Transport Airplane Directorate, Aircraft Certification Service, 1601 Lind Avenue SW., Renton, Washington 98057- 3356; telephone 425-227-1119; facsimile 425-227-1232.
FR Citation82 FR 22065 
CFR AssociatedAircraft; Aviation Safety and Reporting and Recordkeeping Requirements

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