Airworthiness Directive

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Federal Aviation Administration

14 CFR Part 39

AD 57-05-03

Airworthiness Directives; Piper Model PA-23 Aircraft
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57-05-03 PIPER: Applies to Model PA-23, Serial Numbers 23-1 to 23-903 Inclusive.

Compliance required at the next 100-hour inspection but not later than May 1, 1957.

The following careful examination and action is required to overcome excessive wear and possible failure of the elevator push-pull tube.

1. Careful examination should be made of the wear area on the elevator push-pull tube at the point where it passes through the fiber rollers. Any tube that shows wear exceeding 0.005 inch must be replaced.

2. Obtain four each of nylon block, Piper P/N 19225-00 and eight AN 960-516 washers. Remove the four bearings, P/N 80012-67 and the six washers, P/N 81342-61 from the fiber roller installation and reuse in the nylon block installation. Install the above parts, except for the rollers, in accordance with the sketch and instructions shown in Piper Service Bulletin No. 151 dated February 11, 1957.