Service Instruction No. 1497 A

Engine Procedures for Flight Training Operations

Publications

Supersedes Service Instruction No. 1497

April 12, 2011

MODELS AFFECTED

Lycoming IO-360-L2A engines installed in Cessna C172R and 172S aircraft used in training operations

TIME OF COMPLIANCE

As required during aircraft operations

The flight training environment makes an engine more susceptible to spark plug fouling, decreased efficiency, and excessive fuel consumption. Some of the flight training profiles that cause these conditions include over-priming, prolonged idling, a taxi at low engine speeds, and extended operation at full rich mixture.

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