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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
Airworthiness Directives; Piper Model PA-23 Aircraft
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AGENCY: Federal Aviation Administration, DOT
55-14-02 PIPER: Applies to Model PA-23 Serial Numbers 23-1 to 23-208 Inclusive.
Compliance required by August 1, 1955.
Because of possible damage to the hydraulic actuating cylinders for the landing gear system and flap system of the two end plug retaining pins, as a result of excessive pressures caused by thermal expansion, it is necessary that these cylinders be inspected and replaced or modified as follows:
1. If the cylinder housing is upset or fractured, it must be replaced by a new reinforced cylinder P/N 455927.
(Piper Service Bulletin No. 138 dated May 9, 1955, covers this same subject.)
2. If the cylinder housing is not upset or fractured, it must either be replaced by P/N 455927, or reinforced by adding two retaining plugs in accordance with Piper Service Letter No. 250 dated June 8, 1955.
This supersedes AD 55-12-01.