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CFR Citation: 14 CFR Part 23

Docket ID: [Docket No. CE253, Notice No. 23-06-05-SC]

NOTICE: PROPOSED RULES

ACTION: Airworthiness standards:

DOCUMENT ACTION: Notice of proposed special conditions.

SUBJECT CATEGORY: Special Conditions; Cessna Aircraft Company Model 510 Airplane; Turbofan Engines and Engine Location

DATES: Comments must be received on or before July 24, 2006.

DOCUMENT SUMMARY: This notice proposes special conditions for the Cessna Aircraft Company, Model 510 airplane. This new airplane will have novel and unusual design features not typically associated with normal, utility, acrobatic, and commuter category airplanes. These design features include turbofan engines and engine location, for which the applicable regulations do not contain adequate or appropriate airworthiness standards. These proposed special conditions contain the additional airworthiness standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.

SUMMARY: Special conditions—; Cessna Aircraft Co. Model 510 airplane,

SUPPLEMENTAL INFORMATION

Interested persons are invited to participate in the making of these special conditions by submitting such written data, views, or arguments as they may desire. Communications should identify the regulatory docket or notice number and be submitted in duplicate to the address specified above. All communications received on or before the closing date for comments will be considered by the Administrator. The proposals described in this notice may be changed in light of the comments received. All comments received will be available in the Rules Docket for examination by interested persons, both before and after the closing date for comments. A report summarizing each substantive public contact with FAA personnel concerning this rulemaking will be filed in the docket. Persons wishing the FAA to acknowledge receipt of their comments submitted in response to this notice must include with those comments a selfaddressed stamped postcard on which the following statement is made: ``Comments to Docket No. CE253.'' The postcard will be date stamped and returned to the commenter.

Background

On January 28, 2004, Cessna Aircraft Company; One Cessna Boulevard; Post Office Box 7704; Wichita, KS 67277, made an application to the FAA for a new Type Certificate for the Cessna Model 510 Mustang. If approved, the Cessna 510 would be approved under TC No. A24CE. The Cessna Model 510 Mustang is an all new, high performance, low wing, aft fuselage mounted twin turbofan engine powered aircraft in the Normal Category including flight into known icing conditions and single pilot operations. The Model 510 is to use existing Cessna Citation construction materials and methods. The design criteria includes: 8,480 pounds maximum ramp weight, 8,395 pounds maximum takeoff weight, 250 KCAS/0.63 Mach VMO/MMO, and a 41,000 foot maximum altitude. Type Certification Basis

Under the provisions of 14 CFR, part 21, Sec. 21.17, Cessna Aircraft Company must show that the Cessna Model 510 Mustang meets the applicable provisions of 14 CFR, part 23, effective February 1, 1965, as amended by Amendments 231 through Amendment 2354, effective September 14, 2000; 14 CFR, part 36, effective December 1, 1969, through the amendment effective on the date of type certification; 14 CFR, part 34; exemptions, if any; and the special conditions adopted by this rulemaking action.

Discussion

Special conditions, as appropriate, as defined in Sec. 11.19, are issued in accordance with Sec. 11.38, and become part of the type certification basis in accordance with Sec. 21.17.

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 the provisions of Sec. 21.101.

Novel or Unusual Design Features

The Cessna Model 510 Mustang will incorporate the following novel or unusual design features:

Engine Fire Extinguishing System

The Model 510 design includes engines mounted aft on the fuselage; therefore, early visual detection of engine fires is precluded. The applicable existing regulations do not require fire extinguishing systems for engines. Aft mounted engine installations were not envisaged in the development of part 23; therefore, special conditions for a fire extinguishing system with the applicable agents, containers, and materials for the engines of the Model 510 are appropriate. Applicability

As discussed above, these special conditions are applicable to the Cessna Model 510. Should Cessna Aircraft Company apply at a later date 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 under the provisions of Sec. 21.101.

Conclusion

This action affects only certain novel or unusual design features on one model of airplane. It is not a rule of general applicability, and it affects only the applicant who applied to the FAA for approval of these features on the airplane identified.
List of Subjects in 14 CFR Part 23

Aircraft, Aviation safety, Signs and symbols.

Citation

The authority citation for these Special Conditions is as follows:

Authority: 49 U.S.C. 106(g); 40113 and 44701; 14 CFR 21.16 and 21.17; and 14 CFR 11.38 and 11.19.

The Proposed Special Conditions

Accordingly, the Federal Aviation Administration (FAA) proposes the following special conditions as part of the type certification basis for the Cessna Model 510 airplane:
SC23.1195 Engine Fire Extinguishing System
(a) Fire extinguishing systems must be installed and compliance must be shown with the following:
(1) Except for combustor, turbine, and tailpipe sections of turbineengine installations that contain lines or components carrying flammable fluids or gases for which a fire originating in these sections is shown to be controllable, a fire extinguisher system must serve each engine compartment.
(2) The fire extinguishing system, the quantity of the extinguishing agent, the rate of discharge, and the discharge distribution must be adequate to extinguish fires. An individual ``one shot'' system may be used.
(3) The fire extinguishing system for a nacelle must be able to simultaneously protect each compartment of the nacelle for which protection is provided.
(b) Fire extinguishing agents must meet the following requirements: (1) Be capable of extinguishing flames emanating from any burning fluids or other combustible materials in the area protected by the fire extinguishing system; and
(2) Have thermal stability over the temperature range likely to be experienced in the compartment in which they are stored.
(3) If any toxic extinguishing agent is used, provisions must be made to prevent harmful concentrations of fluid or fluid vapors (from leakage during normal operation of the airplane or as a result of discharging the fire extinguisher on the ground or in flight) from entering any personnel compartment, even though a defect may exist in the extinguishing system. This must be shown by test except for built in carbon dioxide fuselage compartment fire extinguishing systems for which:
(i) Five pounds or less of carbon dioxide will be discharged, under established fire control procedures, into any fuselage compartment; or (ii) Protective breathing equipment is available for each flight crewmember on flight deck duty.
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(c) Fire extinguishing agent containers must meet the following requirements:
(1) Each extinguishing agent container must have a pressure relief to prevent bursting of the container by excessive internal pressures. (2) The discharge end of each discharge line from a pressure relief connection must be located so that discharge of the fire extinguishing agent would not damage the airplane. The line must also be located or protected to prevent clogging caused by ice or other foreign matter. (3) A means must be provided for each fire extinguishing agent container to indicate that the container has discharged or that the charging pressure is below the established minimum necessary for proper functioning.
(4) The temperature of each container must be maintained, under intended operating conditions, to prevent the pressure in the container from falling below that necessary to provide an adequate rate of discharge, or rising high enough to cause premature discharge. (5) If a pyrotechnic capsule is used to discharge the extinguishing agent, each container must be installed so that temperature conditions will not cause hazardous deterioration of the pyrotechnic capsule. (d) Fire extinguisher system materials must meet the following requirements:
(1) No material in any fire extinguishing system may react chemically with any extinguishing agent so as to create a hazard. (2) Each system component in an engine compartment must be fireproof.

Issued in Kansas City, Missouri on June 16, 2006. James E. Jackson,
Acting Manager, Small Airplane Directorate, Aircraft Certification Service.
[FR Doc. 065636 Filed 62206; 8:45 am]
BILLING CODE 491013P

FOR FURTHER INFORMATION CONTACT Peter L. Rouse, Aerospace Engineer, Standards Office (ACE110), Small Airplane Directorate, Aircraft Certification Service, Federal Aviation Administration, Room 301, 901 Locust
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Street, Kansas City, Missouri 64106; telephone (816) 3294135.