During an IFR flight, who may perform flight engineer duties if incapacitated?

The ability to perform flight engineer duties in the event of a crew member's incapacitation hinges on the qualifications of the remaining flight crew. If either pilot meets the necessary qualifications to undertake the flight engineer's responsibilities, they can step in and manage those tasks. This is important for ensuring the safety and continued operation of the aircraft during IFR (Instrument Flight Rules) flight, where multiple technical systems must be monitored and managed effectively.

The rationale behind allowing either qualified pilot to assume the flight engineer's duties is that both pilots typically undergo extensive training that includes knowledge of the aircraft's systems and operational procedures. Therefore, if one pilot is unable to carry out their duties, the other can take over crucial functions without compromising safety.

This flexibility is crucial during IFR operations, where communication and coordination among the crew are vital for navigating in reduced visibility and ensuring compliance with air traffic control instructions. Hence, the correct choice reflects a consideration of safety and practical operational capabilities amid unforeseen circumstances.