
[Federal Register Volume 78, Number 242 (Tuesday, December 17, 2013)]
[Proposed Rules]
[Pages 76252-76254]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2013-29986]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2013-0910; Notice No. 25-13-20-SC]


Special Conditions: Airbus, Model A350-900 Series Airplane; 
Isolation or Protection of the Aircraft Electronic System Security From 
Unauthorized Internal Access

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed special conditions.

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SUMMARY: This action proposes special conditions for Airbus Model A350-
900 series airplanes. These airplanes will have a novel or unusual 
design feature associated with aircraft electronic system security 
protection or isolation from unauthorized internal access. The 
applicable airworthiness regulations do not contain adequate or 
appropriate safety standards for this design feature. These proposed 
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: Send your comments on or before January 31, 2014.

ADDRESSES: Send comments identified by docket number FAA-2013-0910 
using any of the following methods:
     Federal eRegulations Portal: Go to http://www.regulations.gov/ and follow the online instructions for sending 
your comments electronically.
     Mail: Send comments to Docket Operations, M-30, U.S. 
Department of Transportation (DOT), 1200 New Jersey Avenue SE., Room 
W12-140, West Building Ground Floor, Washington, DC 20590-0001.
     Hand Delivery or Courier: Take comments to Docket 
Operations in Room W12-140 of the West Building Ground Floor at 1200 
New Jersey Avenue SE., Washington, DC, between 9 a.m. and 5 p.m., 
Monday through Friday, except federal holidays.
     Fax: Fax comments to Docket Operations at 202-493-2251.
    Privacy: The FAA will post all comments it receives, without 
change, to http://www.regulations.gov/, including any personal 
information the commenter provides. Using the search function of the 
docket 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

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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), as well as at 
http://DocketsInfo.dot.gov/.
    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: Varun Khanna, FAA, Airplane and 
Flightcrew Interface Branch, ANM-111, Transport Airplane Directorate, 
Aircraft Certification Service, 1601 Lind Avenue SW., Renton, 
Washington 98057-3356; telephone (425) 227-1298; facsimile (425) 227-
1320.

SUPPLEMENTARY INFORMATION:

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 proposed special conditions 
based on the comments we receive.

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 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. Airbus proposes the 
Model A350-900 series to be certified for extended operations (ETOPS) 
beyond 180 minutes at entry into service for up to a 420-minute maximum 
diversion time.
    Contemporary transport category airplanes have both safety-related 
and non-safety-related electronic system networks for many operational 
functions. However, electronic system network security considerations 
and functions have played a relatively minor role in the certification 
of such systems because of the isolation, protection mechanisms, and 
limited connectivity between the different networks.

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 novel or 
unusual design feature, the proposed special conditions would also 
apply to the other model under Sec.  21.101.
    In addition to the applicable airworthiness regulations and 
proposed 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 and 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 Feature

    The Airbus Model A350-900 series will incorporate the following 
novel or unusual design feature: an electronics network system 
architecture which is new and novel for commercial transport airplanes 
which introduces potential security risks and vulnerabilities not 
addressed in current regulations and aircraft-level or system-level 
safety assessment methods.

Discussion

    The Airbus Model A350-900 series architecture is new and novel for 
commercial transport airplanes because it allows connection to 
previously isolated data networks connected to systems that perform 
functions required for the safe operation of the airplane. This 
proposed data network and design integration may result in security 
vulnerabilities from intentional or unintentional corruption of data 
and systems critical to the safety and maintenance of the airplane. The 
existing regulations and guidance material did not anticipate this type 
of system architecture or electronic access to aircraft systems. 
Furthermore, 14 CFR regulations and current system safety assessment 
policy and techniques do not address potential security 
vulnerabilities, which could be exploited by unauthorized access to 
airplane networks and servers. Therefore, these special conditions are 
proposed to ensure that the security of airplane systems and networks 
is not compromised by unauthorized wired or wireless internal access.

Applicability

    As discussed above, these proposed 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 proposed special 
conditions would apply to that model as well.

Conclusion

    This action affects only certain novel or unusual design features 
on the Airbus Model A350-900 series airplanes related to electronic 
system security protection. 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 Proposed Special Conditions

    Accordingly, the Federal Aviation Administration (FAA) proposes the 
following special conditions as part of the type certification basis 
for Airbus Model A350-900 series airplanes. Isolation of the Airplane 
Electronic System Security Protection from Unauthorized Internal 
Access.

0
1. The applicant must ensure that the design provides isolation from, 
or airplane electronic system security protection against, access by 
unauthorized sources internal to the airplane. The design must prevent 
inadvertent and malicious changes to, and all adverse impacts upon, 
airplane equipment, systems, networks, or other

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assets required for safe flight and operations.
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2. The applicant must establish appropriate procedures to allow the 
operator to ensure that continued airworthiness of the aircraft is 
maintained, including all post type certification modifications that 
may have an impact on the approved electronic system security 
safeguards.

    Issued in Renton, Washington, on October 22, 2013.
Stephen P. Boyd,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2013-29986 Filed 12-16-13; 8:45 am]
BILLING CODE 4910-13-P


