4-3.11. Engine Shutdown

Supplement the AFM/POH engine shutdown procedures with the following:

1. Boost Pump......................................................OFF (according to AFM/POH)

2. Throttle............................................................. 1700 RPM

   WARNING

   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: 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.

3. Ignition Switch.................................................R
   RESULT: RPM drops 150 RPM or less; record Left Magneto RPM drop results. Maximum allowable RPM drop spread between magnetos is 75 RPM.

4. Ignition Switch.................................................BOTH RESULT: Engine RPM returns to approximately 1700 RPM.

5. Ignition Switch.................................................L
   RESULT: RPM drops 150 RPM or less; record Right Magneto RPM drop results. Maximum allowable RPM drop spread between magnetos is 75 RPM.

6. Throttle ............................................................. IDLE

7. MixtureControl...............................................IDLECUTOFF

8. Ignition Switch.................................................OFF