What should a pilot do if their transmitter relay fails while waiting for takeoff clearance?

If a pilot's transmitter relay fails while waiting for takeoff clearance, the appropriate action is to taxi to face the tower and wait for the flashing white light. This procedure is established to ensure that communication can still occur visually. The flashing white light serves as a signal from the tower, allowing the pilot to receive instructions or clearance to take off without the need for verbal communication.

This method is particularly useful in situations where radio communication is compromised. By orienting the aircraft toward the control tower, the pilot ensures that they are in the best position to be seen by tower personnel, who can then manage the traffic effectively. Waiting for the light means that the pilot is still in a position to receive further instructions if necessary, thereby maintaining safety and operational compliance.

The other choices may not effectively resolve the issue at hand. Returning to the service ramp might not be timely or necessary, especially if the problem can be addressed while on the runway. Holding the microphone up to a passing aircraft may not facilitate proper communication and is generally impractical. Continuing to wait in position without any means to receive instructions would not comply with standard procedures and could pose a risk of miscommunication.