Service Instruction No. 1462 A

Propeller Oil Control Leak Test Procedure

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Supersedes Service Instruction No. 1462

July 10, 2003


All Lycoming Direct Drive aircraft engines equipped with a propeller governor.


1. Whenever sluggish propeller action is reported.

2. Whenever the engine does not hold RPM during cruise, climb or descent.

3. Whenever the engine is going into feather during landing roll out with reduced throttle setting.

Front and rear mounted propeller governors are used on Lycoming engines. The purpose of the air pressure check to the propeller governor system is to determine if the governor oil passages have openings (excessive clearance), leaks or restrictions, or blockages (tight clearance).

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