Service Instruction No. 1257 G
Horsepower, Manifold Pressure and RPM Values
Supersedes Service Instruction No. 1257F
May 16, 2008
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.
Get It Exchanged
Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.