AD 79-12-08

79-12-08 PIPER: Amendment 39-3493. Applies to series PA-24-400 S/N 26-2 through 26-148; PA-30 S/N 30-2 through 30-2000; and PA-39 S/N 39-1 through 39-155 aircraft.

PART A

This part applies to all aircraft listed above. Compliance required within 50 hours of operation after the effective date of this AD and at each 50 hours of operation thereafter.

To prevent fuel mismanagement from inter-port leakage with the fuel selector valve causing fuel to transfer from one tank to another, accomplish checks in accordance with the Instructions paragraph in Piper Service Letter No. 851, Part A or an approved equivalent. Item 3 is to be repeated only twice. If drainage still exceeds one half (1/2) fluid ounce of fuel then comply with Item 5. Item 5 is maintenance and must be performed by a certified mechanic.

PART B

This part applies to the cited Models PA-30 and PA-39 aircraft.

If the airplane has been exposed to below freezing temperatures, compliance is required prior to the first flight of the day and after each refueling operation.

To eliminate water contamination of the aircraft fuel supply, accomplish a check in accordance with the Instructions paragraph of Piper Service Letter 851, Part B, Item 2a and 2b or an approved equivalent check.

PART C

This part applies to the cited Model PA-24-400 aircraft.

If the airplane has been exposed to below freezing temperatures, compliance is required prior to the first flight of the day and after each refueling operation.

To eliminate water contamination of the aircraft fuel supply, accomplish a check in accordance with the Instructions paragraph in Piper Service Letter No. 851, Part C, Item 2a or an approved equivalent check.

Upon submission of substantiating data through an FAA maintenance inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, may adjust the repetitive intervals. The checks required by this AD may be performed by the pilot.

Equivalent checks, inspections, and maintenance must be approved by Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

This amendment is effective June 19, 1979.