Service Instruction No. 1132 B
Magneto Drop-Off
Supersedes Service Instruction No. 1132A
June 18, 2010
MODELS AFFECTED
All Lycoming Opposed Series Aircraft Engines with Magnetos.
TIME OF COMPLIANCE
During Pre-Flight Inspection
A basic magneto drop-off check based on engine speed is typically done during the pre-flight inspection to determine the loss of engine speed that occurs when magnetos are switched from BOTH magnetos to one (LEFT or RIGHT) magneto. The maximum drop-off limit is specified in most Lycoming publications as Revolutions Per Minute (RPM) from a stated engine speed.
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