55-02-02 LYCOMING: Applies to Model O-320 Engines Below Serial Number 612 Installed in Aircraft Equipped With Fixed Pitch Propellers.
Compliance required as soon as possible but not later than February 28, 1955.
Several immediate forced landings have occurred with aircraft equipped with the above engine and propeller combinations due to rapid loss of engine oil from the engine accessory drive adapter gasket location. To preclude this possibility, all such engines should be inspected to insure that the proper gasket is installed under the lower accessory drive adapter cover. For engines with fixed pitch propellers, Lycoming P/N 69551, gasket must be installed at this location.
(Lycoming Service Bulletin No. 176 covers this same subject.)