### 53128 Federal Register / Vol. 79, No. 173 / Monday, September 8, 2014 / Rules and Regulations

commitment fee on the outstanding balance of those loans in monthly installments based on the outstanding
balance of those loans.

Market risk means the risk to your
financial condition because the value of your holdings may decline if interest rates or market prices change. Exposure to market risk is measured by assessing the effect of changing rates and prices on either the earnings or economic value of an individual instrument, a portfolio, or the entire Corporation.

Maturing obligations means maturing debt and other obligations that may be expected, such as buyouts of long-term standby purchase commitments or repurchases of agricultural mortgage

securities.

Mortgage securities means securities
that are either:

(1) Pass-through securities or participation certificates that represent ownership of a fractional undivided interest in a specified pool of residential (excluding home equity loans), multifamily or commercial mortgages,

or (2) A multiclass security (including collateralized mortgage obligations and real estate mortgage investment conduits) that is backed by a pool of residential, multifamily or commercial real estate mortgages, pass-through mortgage securities, or other multiclass mortgage securities.

(3) This definition does not include agricultural mortgage-backed securities guaranteed by Farmer Mac itself.

Nationally recognized statistical rating organization (NRSRO) means a rating organization that the Securities and Exchange Commission recognizes

as an NRSRO.

Non-program investments means investments other than those in:

(1) ‘‘Qualified loans’’ as defined in section 8.0(9) of the Farm Credit Act of 1971, as amended; or

(2) Securities collateralized by ‘‘qualified loans.’’

OSMO means FCA’s Office of Secondary Market Oversight.

Program assets means on-balance sheet ‘‘qualified loans’’ as defined in section 8.0(9) of the Farm Credit Act of 1971, as amended.

Program obligations means offbalance sheet ‘‘qualified loans’’ as defined in section 8.0(9) of the Farm Credit Act of 1971, as amended.

Regulatory capital means your core capital plus an allowance for losses and guarantee claims, as determined in accordance with generally accepted accounting principles.

Revenue bond means an obligation of a municipal government that finances a specific project or enterprise, but it is not a full faith and credit obligation. The obligor pays a portion of the revenue generated by the project or enterprise to the bondholders.

Weighted average life (WAL) means the average time until the investor receives the principal on a security, weighted by the size of each principal payment and calculated under specified prepayment assumptions.

Dated: September 3, 2014.
Dale L. Aultman, Secretary, Farm Credit Administration Board.

[FR Doc. 2014–21319 Filed 9–5–14; 8:45 am]

**BILLING CODE 6705–01–P**

**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.

**SUMMARY :**  These special conditions are
issued for Airbus Model A350–900 airplanes. These airplanes will have a novel or unusual design featureassociated with electronic systemsecurity 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 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 operationalfunctions. However, electronic systemnetwork-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 § 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 of14 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 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:


### 53129 Federal Register / Vol. 79, No. 173 / Monday, September 8, 2014 / Rules and Regulations

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 airplanecontrol domain and operatorinformation-services domain. Theairplane-control domain and operatorinformation-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 mayallow the exploitation of networksecurity 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

■ 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 ismaintained, including all post-typecertification 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**

**DEPARTMENT OF TRANSPORTATION**

**Federal Aviation Administration**

**14 CFR Part 25**

**[Docket No. FAA–2013–1002; Special Conditions No. 25–530–SC]** 

**Special Conditions: Airbus Model A350–900 Airplane; Lightning** 
**Protection of Fuel-Tank Structure To Prevent Fuel-Tank Vapor Ignition** 

**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 that will incorporate a nitrogen generation system (NGS) for all fuel tanks, to actively reduce flammability exposure within the fuel tanks significantly below that required by the fuel-tank flammability regulations. Among other benefits, the NGS significantly reduces the potential for fuel-vapor ignition caused by lightning strikes. 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.