[Federal Register Volume 79, Number 173 (Monday, September 8, 2014)]
[Rules and Regulations]
[Pages 53128-53129]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2014-21243]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA-2013-0909; Special Conditions No. 25-533-SC]
Special Conditions: Airbus Model A350-900 Airplane; Electronic
System-Security Protection From Unauthorized External Access
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
airplanes. These airplanes will have a novel or unusual design feature
associated with electronic system-security protection from unauthorized
external access. 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: October 8, 2014.
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:
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.
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 airplane 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 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 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 airplane will incorporate the following
novel or unusual design feature:
[[Page 53129]]
The digital systems architecture for the Airbus Model A350-900
airplane is composed of several connected networks. This network
architecture is used for a diverse set of functions, providing data
connectivity between systems, including:
1. Airplane control, communication, display, monitoring and
navigation systems,
2. Operator business and administrative support systems,
3. Passenger entertainment systems, and
4. Access by systems external to the airplane.
Discussion
The Airbus Model A350-900 airplane network architecture and
configuration may allow increased connectivity to, and access from,
external network sources, and operator operations and maintenance
networks to the airplane control domain and operator-information-
services domain. The airplane-control domain and operator-information-
services domain perform functions required for the safe operation and
maintenance of the airplane. Previously, these domains had very limited
connectivity with external network sources. The network architecture
and configuration may allow the exploitation of network-security
vulnerabilities resulting in intentional or unintentional destruction,
disruption, degradation, or exploitation of data, systems, and networks
critical to the safety and maintenance of the airplane.
The existing regulations and guidance material did not anticipate
these types of airplane system architectures. 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, data buses, and
servers. Therefore, these special conditions are to ensure that
unauthorized wired or wireless electronic connections do not compromise
the security (i.e., confidentiality, integrity, and availability) of
airplane systems.
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. 25-13-17-SC for the
Airbus Model A350-900 airplane was published in the Federal Register on
December 17, 2013 (78 FR 76251)
Comment From Airbus
Airbus had one comment about the following wording of the first
paragraph of the Proposed Special Conditions:
The applicant must ensure airplane electronic system security
protection from access to or by unauthorized sources external to the
airplane, including those possibly caused by maintenance activity.
Airbus considers that the wording ``to or by'' is incorrect. The
protection must prevent access from unauthorized sources external to
the airplane only. The requirement of protection to unauthorized
sources external to the airplane, is not relevant.
Therefore, Airbus suggests that the wording be modified as follows:
The applicant must ensure airplane electronic system security
protection from access by unauthorized sources external to the
airplane, including those possibly caused by maintenance activity.
FAA Response
The FAA agrees with Airbus and has changed the special conditions
accordingly.
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.
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
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.
1. The applicant must ensure airplane electronic system-security
protection from access by unauthorized sources external to the
airplane, including those possibly caused by maintenance activity.
2. The applicant must ensure that electronic system-security
threats are identified and assessed, and that effective electronic
system-security protection strategies are implemented to protect the
airplane from all adverse impacts on safety, functionality, and
continued airworthiness.
3. The applicant must establish appropriate procedures to allow the
operator to ensure that continued airworthiness of the airplane 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 August 15, 2014.
Jeffrey E. Duven,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 2014-21243 Filed 9-5-14; 8:45 am]
BILLING CODE 4910-13-P