80 FR 36470 - Special Conditions: Bombardier Aerospace Incorporated, Models BD-500-1A10 and BD-500-1A11 Series Airplanes; Electronic Flight-Control System (EFCS): Pitch-and Roll-Limiting Functions

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 80, Issue 122 (June 25, 2015)

Page Range		36470-36471
FR Document		2015-15545

These special conditions are issued for the Bombardier Aerospace Model BD-500-1A10 and BD-500-1A11 series airplanes. These airplanes will have a novel or unusual design feature associated with a fly-by-wire EFCS that limits pitch- and roll-limiting functions to prevent the airplane from attaining certain pitch attitudes and roll angles. This system generates the actual surface commands that provide for stability augmentation and flight control for all three airplane axes (longitudinal, lateral, and directional). 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 80 Issue 122 (Thursday, June 25, 2015)

[Federal Register Volume 80, Number 122 (Thursday, June 25, 2015)]
[Rules and Regulations]
[Pages 36470-36471]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2015-15545]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2015-0426; Special Conditions No. 25-576-SC]


Special Conditions: Bombardier Aerospace Incorporated, Models BD-
500-1A10 and BD-500-1A11 Series Airplanes; Electronic Flight-Control 
System (EFCS): Pitch-and Roll-Limiting Functions

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions.

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SUMMARY: These special conditions are issued for the Bombardier 
Aerospace Model BD-500-1A10 and BD-500-1A11 series airplanes. These 
airplanes will have a novel or unusual design feature associated with a 
fly-by-wire EFCS that limits pitch- and roll-limiting functions to 
prevent the airplane from attaining certain pitch attitudes and roll 
angles. This system generates the actual surface commands that provide 
for stability augmentation and flight control for all three airplane 
axes (longitudinal, lateral, and directional). 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: Effective July 27, 2015.

FOR FURTHER INFORMATION CONTACT: Joe Jacobsen, FAA, Standardization 
Branch, ANM-111 Transport Airplane Directorate, Aircraft Certification 
Service, 1601 Lind Avenue SW., Renton, Washington 98057-3356; telephone 
425-227-2011; facsimile 425-227-1149.

SUPPLEMENTARY INFORMATION: 

Background

    On December 10, 2009, Bombardier Aerospace applied for a type 
certificate for their new Model BD-500-1A10 and

[[Page 36471]]

BD-500-1A11 series airplanes (hereafter collectively referred to as 
``CSeries''). Bombardier later applied for, and was granted, an 
extension of time for the type certificate, which changed the effective 
application date to December 31, 2011. The CSeries airplanes are swept-
wing monoplanes with an aluminum alloy fuselage, sized for 5-abreast 
seating. Passenger capacity is 110 for the Model BD-500-1A10 and 125 
for the Model BD-500-1A11. The airplanes are powered by two underwing 
Pratt and Whitney PW1524G ultra-high bypass, geared, turbofan engines. 
Maximum takeoff weight is 131,000 pounds for the Model BD-500-1A10 and 
144,000 pounds for the Model BD-500-1A11. The CSeries airplanes will 
have a fly-by-wire EFCS.

Type Certification Basis

    Under the provisions of Title 14, Code of Federal Regulations (14 
CFR) 21.17, Bombardier Aerospace must show that the CSeries airplane 
meets the applicable provisions of part 25, as amended by Amendments 
25-1 through 25-129.
    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 Bombardier CSeries 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 include any other model that incorporates the same or similar 
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 Bombardier CSeries airplane 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 must issue 
a finding of regulatory adequacy under Sec.  611 of Public Law 92-574, 
the ``Noise Control Act of 1972.''
    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.  21.17(a)(2).

Novel or Unusual Design Features

    The Bombardier CSeries airplane will incorporate the following 
novel or unusual design feature: Fly-by-wire EFCS that will limit pitch 
and roll functions to prevent the airplane from attaining certain pitch 
attitudes and roll angles greater than plus or minus 65 degrees, and 
positive spiral stability introduced for roll angles greater than 30 
degrees at speeds below VMO/MMO. This system 
generates the actual surface commands that provide for stability 
augmentation and flight control for all three airplane axes 
(longitudinal, lateral, and directional).

Discussion

    Part 25 does not specifically relate to flight characteristics 
associated with fixed attitude limits. Bombardier proposes to implement 
on the CSeries airplanes pitch and roll attitude-limiting functions via 
the EFCS normal mode. This will prevent the airplane from attaining 
certain pitch attitudes and roll angles greater than plus or minus 65 
degrees. In addition, positive spiral stability, introduced for roll 
angles greater than 30 degrees at speeds below VMO/
MMO, and spiral stability characteristics, must not require 
excessive pilot strength to achieve bank angles up to the bank-angle 
limit.
    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.

Discussion of Comments

    Notice of proposed special conditions no. 25-15-02-SC for the 
Bombardier Model BD-500-1A10 and BD-500-1A11 series airplanes was 
published in the Federal Register on February 27, 2015 (80 FR 10632). 
No substantive comments were received, and the special conditions are 
adopted as proposed.

Applicability

    As discussed above, these special conditions are applicable to the 
Bombardier CSeries airplane. Should Bombardier Aerospace apply later 
for a change to the type certificate to include another model 
incorporating the same or similar 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 Bombardier CSeries airplanes. It is not a rule of general 
applicability.

List of Subjects in 14 CFR Part 25

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements.

    The authority citation for these special conditions is as follows:

    Authority:  49 U.S.C. 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 Bombardier CSeries airplanes.
    In addition to Sec.  25.143, the following requirements apply to 
the EFCS pitch- and roll-limiting functions:
    1. The pitch-limiting function must not impede normal maneuvering 
for pitch angles up to the maximum required for normal maneuvering, 
including a normal, all-engines-operating takeoff, plus a suitable 
margin to allow for satisfactory speed control.
    2. The pitch- and roll-limiting functions must not restrict or 
prevent attaining pitch attitudes necessary for emergency maneuvering, 
or roll angles up to 65 degrees. Spiral stability, which is introduced 
above 30 degrees roll angle, must not require excessive pilot strength 
to achieve these roll angles. Other protections, which further limit 
the roll capability under certain extreme angle-of-attack, attitude, or 
high-speed conditions, are acceptable, as long as they allow at least 
45 degrees of roll capability.
    3. A lower limit of roll is acceptable beyond the overspeed warning 
if it is possible to recover the airplane to the normal flight envelope 
without undue difficulty or delay.

    Issued in Renton, Washington, on June 17, 2015.
Jeffrey E. Duven,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2015-15545 Filed 6-24-15; 8:45 am]
 BILLING CODE 4910-13-P

36470 Federal Register / Vol. 80, No. 122 / Thursday, June 25, 2015 / Rules and Regulations

flightcrew can turn the therapeutic Communications modifications to the minimum supply required by the
oxygen system on and off from the flight Boeing Model 747–8 series airplanes passengers for supplemental use
deck to allow use at any point during was published in the Federal Register following a loss of cabin pressure.
the flight, and to preserve a sufficient on April 30, 2015 (80 FR 24225). No Issued in Renton, Washington, on June 17,
remaining oxygen reserve, in the event comments were received, and the 2015.
therapeutic oxygen is used for medical special conditions are adopted as Jeffrey E. Duven,
purposes, to accommodate the proposed. Manager, Transport Airplane Directorate,
passengers in the event of an emergency Aircraft Certification Service.
oxygen situation. Applicability
[FR Doc. 2015–15546 Filed 6–24–15; 8:45 am]
The gaseous passenger oxygen system As discussed above, these special
BILLING CODE 4910–13–P
will be modified to accommodate conditions are applicable to Boeing
additional supply cylinders and several Model 747–8 series airplanes. Should
therapeutic oxygen outlets located L–3 Communications apply at a later DEPARTMENT OF TRANSPORTATION
throughout the cabin. Each therapeutic date for a supplemental type certificate
outlet will provide a constant flow of to modify any other model included on Federal Aviation Administration
oxygen at either 2 or 4 liters per minute. Type Certificate No. A20WE to
The flightcrew will be able to control incorporate the same novel or unusual 14 CFR Part 25
the flow of therapeutic oxygen at any design feature, these special conditions
time during flight. Therapeutic oxygen would apply to that model as well. [Docket No. FAA–2015–0426; Special
systems previously have been certified, Conditions No. 25–576–SC]
Under standard practice, the effective
and were generally considered an date of final special conditions would
extension of the passenger oxygen Special Conditions: Bombardier
be 30 days after the date of publication Aerospace Incorporated, Models BD–
system for the purpose of defining the in the Federal Register; however, as the
applicable regulations. As a result, the 500–1A10 and BD–500–1A11 Series
certification date for the L–3 Airplanes; Electronic Flight-Control
applicable regulations included those Communications modifications to
that applied to oxygen systems in System (EFCS): Pitch-and Roll-
Boeing Model 747–8 series airplanes is Limiting Functions
general, or supplemental oxygen imminent, the FAA finds that good
systems. cause exists to make these special AGENCY: Federal Aviation
Discussion conditions effective upon publication. Administration (FAA), DOT.
Conclusion ACTION: Final special conditions.
No specific regulations address the
design and installation of oxygen This action affects only certain novel SUMMARY: These special conditions are
systems used specifically for therapeutic or unusual design features on one model issued for the Bombardier Aerospace
applications. Existing requirements, series of airplanes. It is not a rule of Model BD–500–1A10 and BD–500–
such as §§ 25.1309, 25.1441(b) and (c), general applicability, and affects only 1A11 series airplanes. These airplanes
25.1451, and 24.1453, in the Boeing the applicant who applied to the FAA will have a novel or unusual design
Model 747–8 series airplanes for approval of these features on the feature associated with a fly-by-wire
certification basis applicable to this STC airplane. EFCS that limits pitch- and roll-limiting
project, provide some design standards functions to prevent the airplane from
appropriate for oxygen system List of Subjects in 14 CFR Part 25 attaining certain pitch attitudes and roll
installations. However, additional Aircraft, Aviation safety, Reporting angles. This system generates the actual
design standards for systems and recordkeeping requirements. surface commands that provide for
supplementing the existing oxygen stability augmentation and flight control
system are needed to complement the The authority citation for these
special conditions is as follows: for all three airplane axes (longitudinal,
existing applicable requirements. The lateral, and directional). The applicable
addition of equipment involved in this Authority: 49 U.S.C. 106(g), 40113, 44701, airworthiness regulations do not contain
installation, and the unsafe conditions 44702, 44704.
adequate or appropriate safety standards
that can exist when the oxygen content The Special Conditions for this design feature. These special
of an enclosed area becomes too high conditions contain the additional safety
because of system leaks, malfunction, or Accordingly, pursuant to the
standards that the Administrator
damage from external sources, make it authority delegated to me by the
considers necessary to establish a level
necessary to ensure that adequate safety Administrator, the following special
of safety equivalent to that established
standards are applied to the design and conditions are issued as part of the type
by the existing airworthiness standards.
installation of the oxygen system in certification basis for Boeing Model
747–8 series airplanes as modified by L– DATES: Effective July 27, 2015.
Boeing Model 747–8 series airplanes.
These potential hazards also necessitate 3 Communications Integrated Systems. FOR FURTHER INFORMATION CONTACT: Joe
development and application of The distribution system for the Jacobsen, FAA, Standardization Branch,
appropriate additional design and therapeutic-oxygen system must be ANM–111 Transport Airplane
installation standards. designed and installed as follows: Directorate, Aircraft Certification
These special conditions contain the When oxygen is supplied to Service, 1601 Lind Avenue SW.,
additional safety standards that the passengers for both supplemental and Renton, Washington 98057–3356;
Administrator considers necessary to therapeutic purposes, the distribution telephone 425–227–2011; facsimile
establish a level of safety equivalent to system must be designed for either— 425–227–1149.
Lhorne on DSK7TPTVN1PROD with RULES

that established by the existing 1. A source of supplemental supply SUPPLEMENTARY INFORMATION:
airworthiness standards. for protection from hypoxia following a
loss of cabin pressure, and a separate Background
Discussion of Comments source for therapeutic purposes, or On December 10, 2009, Bombardier
Notice of proposed special conditions 2. A common source of supply, with Aerospace applied for a type certificate
No. 25–15–05–SC for the L–3 means to separately reserve the for their new Model BD–500–1A10 and

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Federal Register / Vol. 80, No. 122 / Thursday, June 25, 2015 / Rules and Regulations 36471

BD–500–1A11 series airplanes (hereafter functions to prevent the airplane from Authority: 49 U.S.C. 106(g), 40113, 44701,
collectively referred to as ‘‘CSeries’’). attaining certain pitch attitudes and roll 44702, 44704.
Bombardier later applied for, and was angles greater than plus or minus 65 The Special Conditions
granted, an extension of time for the degrees, and positive spiral stability
type certificate, which changed the introduced for roll angles greater than Accordingly, pursuant to the
effective application date to December 30 degrees at speeds below VMO/MMO. authority delegated to me by the
31, 2011. The CSeries airplanes are This system generates the actual surface Administrator, the following special
swept-wing monoplanes with an commands that provide for stability conditions are issued as part of the type-
aluminum alloy fuselage, sized for 5- augmentation and flight control for all certification basis for the Bombardier
abreast seating. Passenger capacity is three airplane axes (longitudinal, lateral, CSeries airplanes.
110 for the Model BD–500–1A10 and and directional). In addition to § 25.143, the following
125 for the Model BD–500–1A11. The requirements apply to the EFCS pitch-
airplanes are powered by two Discussion and roll-limiting functions:
underwing Pratt and Whitney PW1524G Part 25 does not specifically relate to 1. The pitch-limiting function must
ultra-high bypass, geared, turbofan flight characteristics associated with not impede normal maneuvering for
engines. Maximum takeoff weight is fixed attitude limits. Bombardier pitch angles up to the maximum
131,000 pounds for the Model BD–500– proposes to implement on the CSeries required for normal maneuvering,
1A10 and 144,000 pounds for the Model airplanes pitch and roll attitude-limiting including a normal, all-engines-
BD–500–1A11. The CSeries airplanes functions via the EFCS normal mode. operating takeoff, plus a suitable margin
will have a fly-by-wire EFCS. This will prevent the airplane from to allow for satisfactory speed control.
attaining certain pitch attitudes and roll 2. The pitch- and roll-limiting
Type Certification Basis angles greater than plus or minus 65 functions must not restrict or prevent
Under the provisions of Title 14, Code degrees. In addition, positive spiral attaining pitch attitudes necessary for
of Federal Regulations (14 CFR) 21.17, stability, introduced for roll angles emergency maneuvering, or roll angles
Bombardier Aerospace must show that greater than 30 degrees at speeds below up to 65 degrees. Spiral stability, which
the CSeries airplane meets the VMO/MMO, and spiral stability is introduced above 30 degrees roll
applicable provisions of part 25, as characteristics, must not require angle, must not require excessive pilot
amended by Amendments 25–1 through excessive pilot strength to achieve bank strength to achieve these roll angles.
25–129. angles up to the bank-angle limit. Other protections, which further limit
If the Administrator finds that the These special conditions contain the the roll capability under certain extreme
applicable airworthiness regulations additional safety standards that the angle-of-attack, attitude, or high-speed
(i.e., 14 CFR part 25) do not contain Administrator considers necessary to conditions, are acceptable, as long as
adequate or appropriate safety standards establish a level of safety equivalent to they allow at least 45 degrees of roll
for the Bombardier CSeries airplanes that established by the existing capability.
because of a novel or unusual design airworthiness standards. 3. A lower limit of roll is acceptable
feature, special conditions are beyond the overspeed warning if it is
prescribed under the provisions of Discussion of Comments possible to recover the airplane to the
§ 21.16. Notice of proposed special conditions normal flight envelope without undue
Special conditions are initially no. 25–15–02–SC for the Bombardier difficulty or delay.
applicable to the model for which they Model BD–500–1A10 and BD–500– Issued in Renton, Washington, on June 17,
are issued. Should the type certificate 1A11 series airplanes was published in 2015.
for that model be amended later to the Federal Register on February 27, Jeffrey E. Duven,
include any other model that 2015 (80 FR 10632). No substantive Manager, Transport Airplane Directorate,
incorporates the same or similar novel comments were received, and the Aircraft Certification Service.
or unusual design feature, these special special conditions are adopted as [FR Doc. 2015–15545 Filed 6–24–15; 8:45 am]
conditions would also apply to the other proposed.
BILLING CODE 4910–13–P
model under § 21.101.
In addition to the applicable Applicability
airworthiness regulations and special As discussed above, these special
DEPARTMENT OF TRANSPORTATION
conditions, the Bombardier CSeries conditions are applicable to the
airplane must comply with the fuel-vent Bombardier CSeries airplane. Should Federal Aviation Administration
and exhaust-emission requirements of Bombardier Aerospace apply later for a
14 CFR part 34, and the noise- change to the type certificate to include 14 CFR Part 39
certification requirements of 14 CFR another model incorporating the same
part 36. The FAA must issue a finding or similar novel or unusual design [Docket No. FAA–2014–0426; Directorate
of regulatory adequacy under § 611 of feature, these special conditions would Identifier 2013–NM–231–AD; Amendment
39–18186; AD 2015–12–11]
Public Law 92–574, the ‘‘Noise Control apply to that model as well.
Act of 1972.’’ Conclusion
RIN 2120–AA64
The FAA issues special conditions, as
defined in 14 CFR 11.19, in accordance This action affects only certain novel Airworthiness Directives; The Boeing
with § 11.38, and they become part of or unusual design features on Company Airplanes
the type-certification basis under Bombardier CSeries airplanes. It is not
a rule of general applicability. Correction
§ 21.17(a)(2).
Lhorne on DSK7TPTVN1PROD with RULES

In rule document 2015–14703
Novel or Unusual Design Features List of Subjects in 14 CFR Part 25
beginning on page 34827 in the issue of
The Bombardier CSeries airplane will Aircraft, Aviation safety, Reporting Thursday, June 18, 2015 make the
incorporate the following novel or and recordkeeping requirements. following correction:
unusual design feature: Fly-by-wire The authority citation for these 1. On page 34827, in the second
EFCS that will limit pitch and roll special conditions is as follows: column, in the SUMMARY section, in

VerDate Sep<11>2014 13:54 Jun 24, 2015 Jkt 235001 PO 00000 Frm 00007 Fmt 4700 Sfmt 4700 E:\FR\FM\25JNR1.SGM 25JNR1

Document Created: 2015-12-15 14:17:22
Document Modified: 2015-12-15 14:17:22

Category		Regulatory Information
Collection		Federal Register
sudoc Class		AE 2.7: GS 4.107: AE 2.106:
Publisher		Office of the Federal Register, National Archives and Records Administration
Section		Rules and Regulations
Action		Final special conditions.
Dates		Effective July 27, 2015.
Contact		Joe Jacobsen, FAA, Standardization Branch, ANM-111 Transport Airplane Directorate, Aircraft Certification Service, 1601 Lind Avenue SW., Renton, Washington 98057-3356; telephone 425-227-2011; facsimile 425-227-1149.
FR Citation		80 FR 36470
CFR Associated		Aircraft; Aviation Safety and Reporting and Recordkeeping Requirements

80 FR 36470 - Special Conditions: Bombardier Aerospace Incorporated, Models BD-500-1A10 and BD-500-1A11 Series Airplanes; Electronic Flight-Control System (EFCS): Pitch-and Roll-Limiting Functions

DEPARTMENT OF TRANSPORTATIONFederal Aviation Administration

Federal Register Volume 80, Issue 122 (June 25, 2015)

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration