Service Instruction No. 1257 G

Horsepower, Manifold Pressure and RPM Values

Publications

Supersedes Service Instruction No. 1257F

May 16, 2008 

MODELS AFFECTED

Lycoming supercharged and turbocharged aircraft engines.

TIME OF COMPLIANCE 

During engine maintenance.

It is important to note that all Lycoming supercharged (GSO and IGSO) engines attain take­off power at  less than full throttle, while some turbocharged engines attain take­off power only at full throttle and others  at part throttle. It is the operator’s responsibility to know the type being operated.

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