How does the RCP pilot signal the FCP pilot to actuate the Auxiliary Battery switch?

The correct answer is based on the standard operating procedures that dictate how the RCP (Rear Cockpit Pilot) communicates specific actions to the FCP (Front Cockpit Pilot). Touching the mask with two extended fingers is a non-verbal signaling method that allows the RCP pilot to discreetly and effectively convey the instruction to actuate the Auxiliary Battery switch. This method is especially useful in noisy environments or situations where verbal communication may not be practical or efficient.

The action of touching the mask serves as a clear and recognizable signal between the pilots, promoting a swift response without disrupting the flow of operations. This kind of signaling is important in aviation, where quick, concise communication can be critical to safety and efficiency during flight operations.

Other methods mentioned, such as verbal commands, visual light signals, or raising the battery cover, are either less efficient in certain flight conditions or not specifically designated for this particular instruction, making them unsuitable for this context. The chosen method of signaling creates clarity and minimizes the potential for miscommunication, which is essential in a cockpit environment.