Federal Register / Vol. 79, No. 143 / Friday, July 25, 2014 / Rules and Regulations 43239 

2. Maintenance of Acceptable 

Acceleration and Loads Experienced by 

the Occupants 

The applicant must show that the 

impact response characteristics of the 

Airbus Model A350–900 airplane, 

specifically the vertical acceleration 

levels experienced at the seat/floor 

interface, and loads experienced by the 

occupants during the impact events, are 

consistent with those found in 

§ 25.562(b), or with levels expected for 

a previously certificated wide-body 

transport-category airplane for the 

conditions stated above. 

3. Maintenance of a Survivable Volume 

For the conditions stated above, the 

applicant must show that all areas of the 

airplane occupied for takeoff and 

landing provide a survivable volume 

comparable to that of previously 

certificated wide-body transportcategory airplanes of similar size during 

and after the impact event. This means 

that structural deformation will not 

result in infringement of the occupants’ 

normal living space, so that passenger 

survivability will not be significantly 

affected. 

4. Maintenance of Occupant Emergency 

Egress Paths 

The evacuation of occupants must be 

comparable to that from a previously 

certificated wide-body transportcategory airplane of similar size. To 

show this, the applicant must show that 

the suitability of the egress paths, as 

determined following the verticalimpact events, is comparable to the 

suitability of the egress paths of a 

comparable, certificated, wide-body 

transport-category airplane, as 

determined following the same verticalimpact events. 

Issued in Renton, Washington, on July 9, 

2014. 

Jeffrey E. Duven, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2014–17574 Filed 7–24–14; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 25 

[Docket No. FAA–2013–0910; Special 

Conditions No. 25–534–SC] 

Special Conditions: Airbus Model 

A350–900 Airplanes; Isolation or 

Protection of the Aircraft Electronic 

System Security From Unauthorized 

Internal Access 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final special conditions. 

SUMMARY: These special conditions are 

issued for Airbus Model A350–900 

airplanes. These airplanes will have a 

novel or unusual design feature 

associated with airplane 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 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: August 25, 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 wingmounted 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 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 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 

The Airbus Model A350–900 airplane 

will incorporate the following novel or 

unusual design feature: An electronics 

network system architecture that is 

novel or unusual for commercial 

transport airplanes, and that introduces 

potential security risks and 

vulnerabilities not addressed in current 

regulations and airplane-level or 

system-level safety assessment methods. 

Discussion 

The Airbus Model A350–900 airplane 

architecture is novel or unusual for 

commercial transport airplanes because 

it allows connection to previously 

isolated data networks connected to 

systems that perform functions required 


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43240 Federal Register / Vol. 79, No. 143 / Friday, July 25, 2014 / Rules and Regulations 

for the safe operation of the airplane. 

This 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 airplane systems. Furthermore, 14 

CFR regulations, and current systemsafety 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 

to ensure that the security of airplane 

systems and networks is not 

compromised by unauthorized wired or 

wireless internal access. 

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. 25–13–20–SC for Airbus Model 

A350–900 airplanes was published in 

the Federal Register on December 17, 

2013 (78 FR 76252). No comments were 

received, and the special conditions are 

adopted as proposed. 

Applicability 

As discussed above, these special 

conditions are applicable 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 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 typecertification basis for Airbus Model 

A350–900 airplanes. 

Isolation of the Airplane Electronic 

System Security Protection from 

Unauthorized Internal Access 

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 

assets required for safe flight and 

operations. 

2. The applicant must establish 

appropriate procedures to allow the 

operator to ensure that continued 

airworthiness of the airplane is 

maintained, including all post-typecertification modifications that may 

have an impact on the approved 

electronic system security safeguards. 

Issued in Renton, Washington, on July 9, 

2014. 

Jeffrey E. Duven, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2014–17576 Filed 7–24–14; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 91 

[Docket No. FAA–2014–0396] 

Interpretation of the Special Rule for 

Model Aircraft 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of interpretation with 

request for comment; Extension of 

comment period. 

SUMMARY: The FAA is extending the 

comment period on its Interpretation of 

the Special Rule for Model Aircraft that 

was published on June 25, 2014. 

DATES: The comment period for the 

notice of interpretation published June 

25, 2014 (79 FR 36172), is extended. 

Comments must be received on or 

before September 23, 2014. 

ADDRESSES: You may send comments 

identified by docket number FAA– 

2014–0396 using any of the following 

methods: 

• Federal eRulemaking 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, 1200 New Jersey 

Avenue SE., West Building Ground 

Floor, Room W12–140, West Building 

Ground Floor, Washington, DC 20590– 

0001. 

• Hand Delivery: 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: (202) 493–2251. 

FOR FURTHER INFORMATION CONTACT: 

Dean E. Griffith, Attorney, International 

Law, Legislation, and Regulations 

Division, Office of the Chief Counsel, 

Federal Aviation Administration, 800 

Independence Avenue SW., 

Washington, DC 20591; telephone (202) 

267–3073; email: dean.griffith@faa.gov. 

SUPPLEMENTARY INFORMATION: The FAA 

published a notice of interpretation with 

request for comment in the Federal 

Register on June 25, 2014 (79 FR 36172) 

that discussed the FAA’s interpretation 

of the Special Rule for Model Aircraft 

established in section 336 of the FAA 

Modernization and Reform Act of 2012. 

The notice requested that interested 

parties submit written comments by July 

25, 2014. 

On July 16, 2014, the Academy of 

Model Aeronautics submitted a request 

to extend the comment period by 60 

days, citing the need to ‘‘educate the 

aeromodeling community, clarify the 

issues, and respond to questions 

regarding the impact that the 

interpretive rule has on various aspects 

of the modeling activity.’’ The FAA 

agrees that additional time for the 

submission of comments would be 

helpful, and therefore has decided to 

extend the comment period until 

September 23, 2014. The FAA expects 

that the additional time for comments 

will allow the affected community to 

prepare meaningful comments which 

will help the FAA to determine what 

clarifications to the interpretation may 

be necessary. 

Issued in Washington, DC, on July 22, 

2014. 

Mark W. Bury, 

Assistant Chief Counsel for International Law, 

Legislation, and Regulations. 

[FR Doc. 2014–17528 Filed 7–24–14; 8:45 am] 

BILLING CODE 4910–13–P 


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