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4-3.10. Engine Shutdown
Supplement the AFM/POH engine shutdown procedures with the following:
1. Throttle............................................................. 1700 RPM
Absence of RPM drop during the magneto check may be an
indication of a faulty ignition circuit resulting in a condition
known as "Hot Magneto." Should the propeller be turned by
hand, the engine may inadvertently start and cause personal
injury or death. This condition must be corrected prior to
continued aircraft operation.
CAUTION: When operating on single ignition, some RPM drop
should be noted. Normal indications are up to 150 RPM drop and
slight engine roughness as each magneto is switched off. RPM drop
in excess of 150 RPM may indicate a faulty magneto or fouled spark
plugs. Avoid prolonged single magneto operation to preclude spark
plug fouling.
NOTE: The difference between magnetos individual operation should not
exceed 75 RPM. Maximum RPM drop for either magneto is 150 RPM.
Observe engine smoothness during magneto switching.
If the engine runs roughly after single magneto operation, increase engine
speed to 2200 RPM in the BOTH position and lean the mixture control
until the RPM peaks for ten seconds before returning to the full rich
position to clear the spark plugs and restore smooth operation before
returning to single magneto operation.
2. Ignition Switch................................................. R
RESULT: Noticeable RPM (not to exceed 150 RPM) drop and slight engine
roughness. Maximum allowable RPM drop spread between channels is 75 RPM.
3. Ignition Switch................................................. BOTH
RESULT: Engine speed returns to normal. Allow Ignition switch to remain in
BOTH for approximately 30 seconds to clear engine.
4. Ignition Switch................................................. L
RESULT: Noticeable RPM (not to exceed 150 RPM) drop and slight engine
roughness. Maximum allowable RPM drop spread between channels is 75 RPM.
5. Ignition Switch................................................. BOTH
6. Throttle............................................................. IDLE
7. Mixture Control ............................................... IDLE CUT-OFF
Wait for the propeller to stop...
O-200-D & X Series Engine Installation and Operation Manual
3 January 2017
WARNING
Engine Operation
4-13
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