Special Conditions: Airbus Model A350-900 Airplanes; Flight-Envelope Protection: High-Speed Limiting, 49426-49427 [2014-19822]
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Federal Register / Vol. 79, No. 162 / Thursday, August 21, 2014 / Rules and Regulations
Amendment 25–123 in the certification basis
for Airbus Model A350–900 airplanes. These
special conditions apply only to rechargeable
lithium-ion batteries and battery systems and
their installations. The requirements of
§ 25.1353(b) at Amendment 25–123 remain in
effect for batteries and battery installations
on Airbus Model A350–900 airplanes that do
not use rechargeable lithium-ion batteries.
Issued in Renton, Washington, on July 30,
2014.
Jeffrey E. Duven,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. 2014–19821 Filed 8–20–14; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA–2013–0901; Special
Conditions No. 25–536–SC]
Special Conditions: Airbus Model
A350–900 Airplanes; Flight-Envelope
Protection: High-Speed Limiting
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions.
AGENCY:
These special conditions are
issued for Airbus Model A350–900
series airplanes. These airplanes will
have a novel or unusual design feature
associated with high speed limiting. 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 date: September 22,
2014.
FOR FURTHER INFORMATION CONTACT: Joe
Jacobsen, FAA, Airplane and Flightcrew
Interface Branch, ANM–111, Transport
Airplane Directorate, Aircraft
Certification Service, 1601 Lind Avenue
SW., Renton, Washington 98057–3356;
telephone (425) 227–2011; facsimile
(425) 227–1320.
SUPPLEMENTARY INFORMATION:
tkelley on DSK3SPTVN1PROD with RULES
SUMMARY:
Background
On August 25, 2008, Airbus applied
for a type certificate for their new Model
A350–900 airplane. Later, Airbus
requested, and the FAA approved, an
extension to the application for FAA
type certification to November 15, 2009.
The Model A350–900 airplane has a
conventional layout with twin wing-
VerDate Mar<15>2010
18:53 Aug 20, 2014
Jkt 232001
mounted Rolls-Royce Trent XWB
engines. It features a twin-aisle, 9abreast, economy-class layout, and
accommodates side-by-side placement
of LD–3 containers in the cargo
compartment. The basic Model A350–
900 airplane configuration
accommodates 315 passengers in a
standard two-class arrangement. The
design cruise speed is Mach 0.85 with
a maximum take-off weight of 602,000
lbs.
The longitudinal-control law design
of the Airbus Model A350–900 airplane
incorporates an overspeed protection
system in the normal mode, which
prevents the pilot from inadvertently or
intentionally exceeding a speed
approximately equivalent to VFC or
attaining VDF. Current Title 14 Code of
Federal Regulations (14 CFR) part 25
sections do not relate to a high-speedlimiting protection system that might
preclude or modify flying-qualities
assessments in the overspeed region.
However, the requirements of § 25.253
(high-speed characteristics) and its
related policy are applicable to the
Model A350–900 airplane and are not
affected by this special condition.
Type Certification Basis
Under 14 CFR 21.17, Airbus must
show that the Model A350–900 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 Airbus Model A350–900 airplane
because of a novel or unusual design
feature, special conditions are
prescribed under § 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, the special
conditions would also apply to the other
model under § 21.101.
In addition to the applicable
airworthiness regulations and special
conditions, the Model A350–900
airplane must comply with the fuel-vent
and exhaust-emission requirements of
14 CFR part 34, and the noisecertification requirements of 14 CFR
part 36. The FAA must issue a finding
of regulatory adequacy under section
611 of Public Law 92–574, the ‘‘Noise
Control Act of 1972.’’
The FAA issues special conditions, as
defined in 14 CFR 11.19, under § 11.38,
and they become part of the typecertification basis under § 21.17(a)(2).
PO 00000
Frm 00004
Fmt 4700
Sfmt 4700
Novel or Unusual Design Features
The Model A350–900 airplane
incorporates the following novel or
unusual design features: an overspeed
protection system that prevents the pilot
from inadvertently or intentionally
exceeding a speed approximately
equivalent to VFC, or attaining VDF.
At VMO + 10 knots or MMO + 0.02
knots, an automatic nose-up pitch is
applied with phase advance in the event
of high acceleration. The speed
stabilizes at VD-10kts/MD-0.02 if the
stick is full forward, or the speed will
return below VMO/MMO if the stick is
released.
Discussion
This special condition establishes
requirements to ensure that operation of
the high-speed-limiting protection
system does not impede normal
attainment of speeds up to the
overspeed warning. Its main features
are:
1. It protects the airplane against highspeed/high Mach-number flight
conditions beyond VMO/MMO.
2. It does not interfere with flight at
VMO/MMO, even in turbulent air.
3. It still provides load-factor
limitation through the ‘‘pitch limiting’’
function described below.
4. It restores positive static stability
beyond VMO/MMO.
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. 25–13–23–SC for the Airbus Model
A350–900 airplane was published in the
Federal Register on January 8, 2014 (79
FR 1336). An anonymous comment was
received January 16, 2014. The
commenter was concerned about highlevel windshears, and the potential
violation of Reduced Vertical Separation
Minimums (RVSM) airspace restrictions
that might accompany a nose-up input
of a high-speed protection system. In
addition, the commenter was concerned
about system failures or malfunctions
leading to unintended control
consequences and the pilot’s ability to
appropriately counteract those control
anomalies.
The FAA would like to clarify that
this special condition only addresses
one aspect of high-speed limiting
designs. Many other regulations, such as
14 CFR 25.1301 and 25.1309, address
the proper intended function and failure
scenarios of such a system. Therefore,
E:\FR\FM\21AUR1.SGM
21AUR1
Federal Register / Vol. 79, No. 162 / Thursday, August 21, 2014 / Rules and Regulations
the anonymous comment is beyond the
scope of this special condition, and is
already accounted for and considered in
the basic regulatory-compliance process.
Applicability
As discussed above, these special
conditions apply to Airbus Model
A350–900 airplanes. Should Airbus
apply later for a change to the type
certificate to include another model
incorporating the same novel or unusual
design feature, the special conditions
would apply to that model as well.
Conclusion
This action affects only certain novel
or unusual design features on Airbus
Model A350–900 series 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 Airbus Model A350–900 series
airplanes.
In addition to § 25.143, the following
requirements apply: Operation of the
high-speed limiter during all routine
and descent-procedure flight must not
impede normal attainment of speeds up
to overspeed warning.
■
Issued in Renton, Washington, on August
15, 2014.
Jeffrey E. Duven,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. 2014–19822 Filed 8–20–14; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
tkelley on DSK3SPTVN1PROD with RULES
[Docket No. FAA–2013–1001; Special
Conditions No. 25–535–SC]
Special Conditions: Airbus Model
A350–900 Airplanes; High-Speed
Protection System
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions.
AGENCY:
These special conditions are
issued for Airbus Model A350–900
SUMMARY:
VerDate Mar<15>2010
18:53 Aug 20, 2014
Jkt 232001
airplanes. These airplanes will have a
novel or unusual design feature
associated with a high-speed protection
system that limits nose-down pilot
authority at speeds above VC/MC, and
prevents the airplane from performing
the maneuver required under the Code
of Federal Regulations. 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 date: September 22,
2014.
FOR FURTHER INFORMATION CONTACT:
Todd Martin, FAA, Airframe/Cabin
Safety, ANM–115, Transport Airplane
Directorate, Aircraft Certification
Service, 1601 Lind Avenue SW.,
Renton, Washington 98057–3356;
telephone (425) 227–1178; facsimile
(425) 227–1322.
SUPPLEMENTARY INFORMATION:
Background
On August 25, 2008, Airbus applied
for a type certificate for their new Model
A350–900 airplane. Later, Airbus
requested, and the FAA approved, an
extension to the application for FAA
type certification to November 15, 2009.
The Model A350–900 airplane has a
conventional layout with twin wingmounted Rolls-Royce Trent XWB
engines. It features a twin-aisle, 9abreast, economy-class layout, and
accommodates side-by-side placement
of LD–3 containers in the cargo
compartment. The basic Model A350–
900 airplane configuration
accommodates 315 passengers in a
standard two-class arrangement. The
design cruise speed is Mach 0.85 with
a maximum take-off weight of 602,000
lbs.
The Model A350–900 airplane, like
Airbus Model A320, A330, A340 and
A380 series airplanes, has a high-speed
protection system that limits nose-down
pilot authority at speeds above VC/MC,
and prevents the airplane from actually
performing the maneuver required
under § 25.335(b)(1). Special conditions
are necessary to address the Model
A350–900 airplane high-speed
protection system. These special
conditions identify various symmetric
and non-symmetric maneuvers that will
ensure that an appropriate design dive
speed, VD/MD, is established.
Type Certification Basis
Under Title 14, Code of Federal
Regulations (14 CFR) 21.17, Airbus must
PO 00000
Frm 00005
Fmt 4700
Sfmt 4700
49427
show that the Model A350–900 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 Model A350–900 airplane
because of a novel or unusual design
feature, special conditions are
prescribed under the provisions of
§ 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, the special
conditions would also apply to the other
model under § 21.101.
In addition to the applicable
airworthiness regulations and special
conditions, the Model A350–900
airplane must comply with the fuel-vent
and exhaust-emission requirements of
14 CFR part 34, and the noisecertification requirements of 14 CFR
part 36. The FAA must issue a finding
of regulatory adequacy under section
611 of Public Law 92–574, the ‘‘Noise
Control Act of 1972.’’
The FAA issues special conditions, as
defined in 14 CFR 11.19, under § 11.38,
and they become part of the typecertification basis under § 21.17(a)(2).
Novel or Unusual Design Features
In addition to the applicable
airworthiness regulations and special
conditions, the Model A350–900
airplane must comply with the fuel-vent
and exhaust-emission requirements of
14 CFR part 34, and the noisecertification requirements of 14 CFR
part 36. The FAA must issue a finding
of regulatory adequacy under § 611 of
Public Law 92–574, the ‘‘Noise Control
Act of 1972.’’
The Airbus Model A350–900 airplane
will incorporate the following novel or
unusual design features:
A high-speed protection system that
limits nose-down pilot authority at
speeds above VC/MC, and prevents the
airplane from actually performing the
maneuver required under § 25.335(b)(1).
The special conditions identify various
symmetric and non-symmetric
maneuvers that will ensure that an
appropriate design dive speed, VD/MD,
is established.
Discussion
Section 25.335(b)(1) is an analytical
envelope condition originally adopted
in Part 4b of the Civil Air Regulations
to provide an acceptable speed margin
E:\FR\FM\21AUR1.SGM
21AUR1
]]>Agencies
[Federal Register Volume 79, Number 162 (Thursday, August 21, 2014)]
[Rules and Regulations]
[Pages 49426-49427]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2014-19822]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA-2013-0901; Special Conditions No. 25-536-SC]
Special Conditions: Airbus Model A350-900 Airplanes; Flight-
Envelope Protection: High-Speed Limiting
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final special conditions.
-----------------------------------------------------------------------
SUMMARY: These special conditions are issued for Airbus Model A350-900
series airplanes. These airplanes will have a novel or unusual design
feature associated with high speed limiting. 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 date: September 22, 2014.
FOR FURTHER INFORMATION CONTACT: Joe Jacobsen, FAA, Airplane and
Flightcrew Interface Branch, ANM-111, Transport Airplane Directorate,
Aircraft Certification Service, 1601 Lind Avenue SW., Renton,
Washington 98057-3356; telephone (425) 227-2011; facsimile (425) 227-
1320.
SUPPLEMENTARY INFORMATION:
Background
On August 25, 2008, Airbus applied for a type certificate for their
new Model A350-900 airplane. Later, Airbus requested, and the FAA
approved, an extension to the application for FAA type certification to
November 15, 2009. The Model A350-900 airplane has a conventional
layout with twin wing-mounted Rolls-Royce Trent XWB engines. It
features a twin-aisle, 9-abreast, economy-class layout, and
accommodates side-by-side placement of LD-3 containers in the cargo
compartment. The basic Model A350-900 airplane configuration
accommodates 315 passengers in a standard two-class arrangement. The
design cruise speed is Mach 0.85 with a maximum take-off weight of
602,000 lbs.
The longitudinal-control law design of the Airbus Model A350-900
airplane incorporates an overspeed protection system in the normal
mode, which prevents the pilot from inadvertently or intentionally
exceeding a speed approximately equivalent to VFC or
attaining VDF. Current Title 14 Code of Federal Regulations
(14 CFR) part 25 sections do not relate to a high-speed-limiting
protection system that might preclude or modify flying-qualities
assessments in the overspeed region. However, the requirements of Sec.
25.253 (high-speed characteristics) and its related policy are
applicable to the Model A350-900 airplane and are not affected by this
special condition.
Type Certification Basis
Under 14 CFR 21.17, Airbus must show that the Model A350-900
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 Airbus Model A350-900 airplane
because of a novel or unusual design feature, special conditions are
prescribed under 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, the 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 A350-900 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 section 611 of Public Law 92-574,
the ``Noise Control Act of 1972.''
The FAA issues special conditions, as defined in 14 CFR 11.19,
under Sec. 11.38, and they become part of the type-certification basis
under Sec. 21.17(a)(2).
Novel or Unusual Design Features
The Model A350-900 airplane incorporates the following novel or
unusual design features: an overspeed protection system that prevents
the pilot from inadvertently or intentionally exceeding a speed
approximately equivalent to VFC, or attaining
VDF.
At VMO + 10 knots or MMO + 0.02 knots, an
automatic nose-up pitch is applied with phase advance in the event of
high acceleration. The speed stabilizes at VD-10kts/
MD-0.02 if the stick is full forward, or the speed will
return below VMO/MMO if the stick is released.
Discussion
This special condition establishes requirements to ensure that
operation of the high-speed-limiting protection system does not impede
normal attainment of speeds up to the overspeed warning. Its main
features are:
1. It protects the airplane against high-speed/high Mach-number
flight conditions beyond VMO/MMO.
2. It does not interfere with flight at VMO/
MMO, even in turbulent air.
3. It still provides load-factor limitation through the ``pitch
limiting'' function described below.
4. It restores positive static stability beyond VMO/
MMO.
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. 25-13-23-SC for the
Airbus Model A350-900 airplane was published in the Federal Register on
January 8, 2014 (79 FR 1336). An anonymous comment was received January
16, 2014. The commenter was concerned about high-level windshears, and
the potential violation of Reduced Vertical Separation Minimums (RVSM)
airspace restrictions that might accompany a nose-up input of a high-
speed protection system. In addition, the commenter was concerned about
system failures or malfunctions leading to unintended control
consequences and the pilot's ability to appropriately counteract those
control anomalies.
The FAA would like to clarify that this special condition only
addresses one aspect of high-speed limiting designs. Many other
regulations, such as 14 CFR 25.1301 and 25.1309, address the proper
intended function and failure scenarios of such a system. Therefore,
[[Page 49427]]
the anonymous comment is beyond the scope of this special condition,
and is already accounted for and considered in the basic regulatory-
compliance process.
Applicability
As discussed above, these special conditions apply to Airbus Model
A350-900 airplanes. Should Airbus apply later for a change to the type
certificate to include another model incorporating the same novel or
unusual design feature, the special conditions would apply to that
model as well.
Conclusion
This action affects only certain novel or unusual design features
on Airbus Model A350-900 series 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
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 Airbus Model A350-900 series
airplanes.
In addition to Sec. 25.143, the following requirements apply:
Operation of the high-speed limiter during all routine and descent-
procedure flight must not impede normal attainment of speeds up to
overspeed warning.
Issued in Renton, Washington, on August 15, 2014.
Jeffrey E. Duven,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 2014-19822 Filed 8-20-14; 8:45 am]
BILLING CODE 4910-13-P
