When should a pre-takeoff check be performed?

A pre-takeoff check should be performed just prior to takeoff to ensure that all systems are configured correctly and that the aircraft is ready for a safe departure. This check typically involves verifying that all instruments are functioning properly, that the flight plan is set, and that the necessary safety measures are in place. Conducting this check right before takeoff allows the flight crew to address any last-minute issues and to confirm that critical pre-flight tasks have been completed. Timing the check at this moment is crucial for ensuring safety and preventing any misunderstandings or lapses that could occur with an earlier check.

Performing this check immediately after boarding or after the engines have started would not provide an opportunity to address all necessary systems thoroughly and could lead to oversight. Completing the check when holdover time has been exceeded may not be relevant as it pertains specifically to de-icing procedures rather than the pre-takeoff status of the aircraft itself.