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Small Airplane Directorate
Wichita Aircraft Certification Office
1801 Airport Road, Room 100
Wichita, Kansas 67209

March 13, 2000


Mr. Mike McClary
Single Engine Executive Engineer
Cessna Aircraft Company
7603 East Pawnee
Wichita, KS 67277



Identification of an Unsafe Condition on the Cessna Model 172P Equipped with Integral Wing Fuel Tanks


1. Cessna Letter L417-02-99-178, dated October 20, 1999
2. FAA Letter dated September 23, 1999, same subject.
3. FAA Safety Recommendations 99.283 and 99.284


Dear Mr. McClary:

We have completed our review of the Reference (3) Safety Recommendations. We have identified an unsafe condition, which exists on the subject airplanes and that this condition is likely to exist or develop in other airplanes of the same type design. Additionally, we have determined that the design of the subject airplane fuel system and tanks does not comply with the requirements of CAR 3.4444 for the subject airplane.

Per 14 CFR part 39, we will proceed with Airworthiness Directive action based on the above findings. We have also determined that design changes are necessary to correct the unsafe condition, and per 14 CFR part 21.99 request Cessna submit appropriate design changes for FAA approval within 30 days for the subject airplane. We believe this condition may exist on all Cessna high wing integral wing fuel tank equipped airplanes, and request the identification of applicable models and serial numbers and submittal of appropriate design changes for each model for FAA approval within 60 days.

Based on the findings of this investigation, we shall also be making a Specific Finding to the requirements of 14 CFR part 23.971 on the current Model 182T and T182 programs.

Finally, we are requesting a full review and submittal of the compliance substantiation for the Model 172, 182 and 206 series airplanes manufactured since the restart of production (Type Certificated since 1996), with respect to the requirements of 14 CFR part 23.971, and water egress capability.

If you have any questions, please contact our Propulsion Engineer Jeff Janusz at 316-946-4166.


Original signed by CLB

Carlos L. Blacklock
Program Manager
Wichita Aircraft Certification Office



FAA Form 1360-14.1 (6-89)

Official File Copy

U.S. Government Printing Office 1995-769-211


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