Which action is NOT permitted with a CSD unit once it is disconnected in flight?

Once a CSD (Constant Speed Drive) unit is disconnected in flight, the primary focus shifts to safety and adherence to procedures. The action of reconnecting the CSD unit without maintenance approval is not permitted because it can pose significant risks. Reconnecting a unit requires careful evaluation and approval from maintenance personnel to ensure that it is safe to do so and to minimize the potential for further malfunctions or safety hazards.

In contrast, continuing with flight maneuvers, using backup systems, and monitoring system performance may all be permissible actions. Flight maneuvers can be carried out with caution, as the aircraft is still operable even if a specific system is disconnected. Utilizing backup systems is often a standard procedure to ensure that critical functions are maintained, even when primary systems are compromised. Monitoring system performance is vital during such an event to assess any underlying issues and ensure that the aircraft remains safe and controllable throughout the flight.

The restriction on reconnecting without maintenance approval is crucial for maintaining operational safety and ensuring that all necessary precautions and checks have been completed before any components are reengaged.