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Which option correctly identifies the reasons, listed below, for disconnecting a constant speed drive (CSD) of an AC generator in flight?

1. Low oil pressure in the CSD
2. Slight variation about the normal operating frequency
3. High oil temperature in the CSD
4. Excessive variation of voltage and kVAR

  • A
    1, 3.
  • B
    1, 4.
  • C
    2, 4.
  • D
    2, 3.

The reason for the availability of disconnecting the CSDU (constant speed drive unit) from the AC Generator is to make sure the malfunction will not affect engine performance. For the CSDU there are only two fault indications in the cockpit; Low Oil Pressure Warning and High Oil Temperature as these can cause more damage to the aircraft when the operation is continued.

Note: The CSDU can only be reconnected on the ground manually after the shutdown of the engine.

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