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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
57-01-02 PIPER: Applies to Model PA-23, Serial Numbers 23-1 to 23-844 Inclusive.
Compliance required not later than February 15, 1957.
The following inspection and action is necessary in order to prevent the possibility of stabilizer failure or malfunction in the event the proper number of bolts are not found attaching the front stabilizer fittings, right and left, P/N 17093-00.
Inspect the two front stabilizer attachment fittings and ascertain that there are three bolts securing each fitting to the longitudinal stringer and the bulkhead (two in the stringer and one in the bulkhead). If less than three bolts have been used, the unsatisfactory condition must be corrected. It will be necessary to remove the stabilizer fairing on the bottom side, and to use a mirror to make the inspection.
(Piper Service Bulletin No. 150 of December 21, 1956, covers this same subject.)