Document ID: FAA-2013-0896-0003
Agency: faa
Document Type: Rule
Title: Special Conditions: Airbus Model A350-900 Series, Limit Pilot Force Because of Side Stick Controller
Posted Date: 2014-06-12T04:00Z

[Federal Register Volume 79, Number 113 (Thursday, June 12, 2014)]
[Rules and Regulations]
[Pages 33673-33674]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2014-13666]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2013-0896; Special Conditions No. 25-529-SC]

Special Conditions: Airbus Model A350-900 Series, Limit Pilot 
Force Because of Side Stick Controller

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions.

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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 side stick controllers which require limited 
pilot force because they are operated by only one hand. 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 14, 2014.

FOR FURTHER INFORMATION CONTACT: Todd Martin, FAA, Airframe and Cabin 
Safety Branch, ANM-115, Transport Airplane Directorate, Aircraft 
Certification Service, 1601 Lind Avenue SW., Renton, Washington, 98057-
3356; telephone (425) 227-1178; facsimile (425) 227-1320.

SUPPLEMENTARY INFORMATION: 

Background

    On August 25, 2008, Airbus applied for a type certificate for their 
new Model A350-900 series airplane. Later, Airbus requested and the FAA 
approved an extension to the application for FAA type certification to 
June 28, 2009. The Model A350-900 series 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 series configuration will accommodate 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 Airbus Model A350-900 series airplane is equipped with two side 
stick controllers instead of the conventional control columns and 
wheels. This kind of controller is designed for only one-hand 
operation. The requirement of Title 14, Code of Federal Regulations (14 
CFR) 25.397(c), which defines limit pilot forces and torques for 
conventional wheel or stick controls, is not adequate for a side stick 
controller. Special conditions are necessary to specify the appropriate 
loading conditions for this kind of controller.

Type Certification Basis

    Under Title 14, Code of Federal Regulations (14 CFR) 21.17, Airbus 
must show that the Model A350-900 series meets the applicable 
provisions of 14 CFR 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 series 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 series 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, 
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 Airbus Model A350-900 series airplane will incorporate the 
following novel or unusual design feature: a side stick controller for 
only one-hand operation by wrist and not by arms.

Discussion

    Special conditions for Airbus side stick controllers have been 
developed and applied during previous Airbus certification programs. 
These special conditions are also appropriate for the Model A350-900 
series side stick controller.
    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. 25-13-27-SC for Airbus 
Model A350-900 series airplanes was published in the Federal Register 
on December 17, 2013 (78 FR 76248). No comments were received, and the 
special conditions are adopted as proposed.

Applicability

    As discussed above, these special conditions apply to Airbus Model 
A350-900 series 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.

[[Page 33674]]

Conclusion

    This action affects only certain novel or unusual design features 
on the 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 lieu of Sec.  25.397(c), which are identical to A320, A340, and A380 
special conditions on the same subject:
    For the Airbus Model A350-900 series airplane equipped with stick 
controls designed for forces to be applied by one wrist and not arms, 
the limit pilot forces are as follows:
    1. For all components between and including the handle and its 
control stops.

------------------------------------------------------------------------
                   Pitch                                Roll
------------------------------------------------------------------------
Nose up 200 lbf...........................  Nose left 100 lbf.
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    2. For all other components of the side stick control assembly, but 
excluding the internal components of the electrical sensor assemblies, 
to avoid damage as a result of an in-flight jam.

------------------------------------------------------------------------
                   Pitch                                Roll
------------------------------------------------------------------------
Nose up 125 lbf...........................  Nose left 50 lbf.
Nose down 125 lbf.........................  Nose right 50 lbf.
------------------------------------------------------------------------

    Issued in Renton, Washington, on: April 22, 2014.
Jeffrey E. Duven,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2014-13666 Filed 6-11-14; 8:45 am]
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