I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 181
FOR SIMULATION USE ONLY – NOT A TRAINING AID
OVERSPEED GOVERNOR CHECK
Any fault discovered during this check is reason for ground abort. Complete this
check in a non-congested area. Monitor oil temperature, and attempt to park facing
into the wind for extended ground operations.
NOTE
If conditions permit, park aircraft facing into the wind prior to beginning
overspeed governor check to enhance oil cooling and reduce engine
operating temperatures.
1. Brakes – Hold as required
2. PCL – IDLE
3. PMU switch – OFF (Verify idle N1 stabilizes between 60 to 70%)
4. PCL – Advance to 100±2% NP (approximately 30% torque) and allow engine to
stabilize
(Verify that propeller remains in governed range with PMU off.)
CAUTION
Advancing the PCL prior to engine stabilizing with PMU OFF or too rapidly
may cause high ITT and engine overtemperature.
5. PCL – Advance slightly and verify NP remains 100±2%
6. PCL – IDLE
7. PMU switch – NORM
(Verify PMU FAIL message extinguishes, NP returns to 46-50% NP and N1
returns to 60-61%.)
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