After oil overtemperature, must the CSD be reset on the ground before reconnecting?

• A. Yes, in flight after oil cools
• B. No, can be reintegrated immediately
• C. Yes, must be reset on the ground
• D. Only with ground crew approval

Answer: (C)

When oil temperature exceeds limits, the CSD is protected by a trip to prevent damage to the gear train and bearings. After cooling to a safe level, the system must be reset on the ground before reconnecting. Resetting on the ground ensures you can verify that the oil is within limits, that the fault condition has cleared, and that the CSD is in a known, safe state before it can re-engage with the aircraft powered and in flight. Reconnecting or resetting in flight or without a proper ground reset could allow a hot, uncontrolled restart or continued damage. So, after an oil overtemperature event, the correct procedure is to perform the reset on the ground before reconnecting.