What must a pilot-in-command determine if there is no MEL?

A pilot-in-command (PIC) must determine that the operation will be safe when there is no Minimum Equipment List (MEL) available. The MEL provides a list of equipment that may be inoperative under specific conditions while still allowing for safe flight operations. In the absence of an MEL, the PIC takes on the responsibility to carefully assess the aircraft's condition and ensure that it is airworthy for the flight.

This evaluation involves considering any inoperative equipment, its potential impact on the aircraft's performance, and whether the pilot can still operate the aircraft safely. Safety is the primary concern, and any aspect that compromises safety must be addressed before proceeding with the flight.

The other options do not accurately represent the PIC's responsibilities when there is no MEL. For instance, determining that the aircraft cannot be flown does not consider the PIC's ability to assess the situation and make a safe decision. Consulting a mechanic might be a prudent step in some situations, but it is not a requirement for the PIC in every instance. Filing an additional report is not relevant in the context of ensuring safe operation when an MEL is not present. Therefore, the focus is on the PIC's ability to determine the safety of the operation based on their knowledge and assessment of the aircraft.