Airworthiness Directive

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Federal Aviation Administration

14 CFR Part 39

AD 57-10-02

Airworthiness Directives; Piper Model PA-23 Aircraft
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57-10-02 PIPER: Applies to Model PA-23 Aircraft Serial Numbers 23-1 to 23-1391 Inclusive.

Compliance required as soon as possible but not later than June 15, 1957.

It has been reported that the flare on the oil pressure gage line has cracked or broken where it attaches to the connector fitting on the aft side of the firewall resulting in loss of oil pressure.

Inspect both right and left oil pressure line flares to determine whether or not they are normal and also to determine that the lines in the area of the flares are not cracked or broken.

Lines that are cracked or broken or have defective flares should be cut off and reflared. Care should be taken that there is no line strain against the fitting or the retainer block and that the line into the fitting is straight. If the line is too short for this repair, it should be cut off and spliced using a connector and flexible hose, Piper P/N 17766-07 or equivalent.

(Piper Service Bulletin No. 152A covers this subject.)