When an aircraft is threatened by grave and imminent danger and requires immediate assistance, the person in command should direct appropriate action as follows:

A. Declare an emergency
B. Transmit a distress call
C. Operate transponder on Mode A
D. All of the above

Answer :

Final answer:

The person in command of an aircraft facing grave and imminent danger should follow specific steps, including declaring an emergency, transmitting a distress call, and operating the transponder on Mode A.

Explanation:

The correct answer is Option D: All of the above.

When an aircraft is threatened by grave and imminent danger and requires immediate assistance, the person in command should follow these steps:

  1. Declare an emergency: The pilot or the person in command must declare a state of emergency to indicate the seriousness of the situation.
  2. Transmit a distress call: The distress call is a radio transmission that alerts air traffic control and other nearby aircraft about the emergency situation.
  3. Operate transponder on Mode A: By operating the transponder on Mode A, the aircraft sends out a specific code that indicates it is in distress and requires immediate assistance.
  4. All of the above: These three steps are crucial in requesting immediate assistance when an aircraft is facing grave and imminent danger.