When operating HF radios on the ground, the weight-on-wheels safety feature must be bypassed from where?

• A. The physical MCDU in the center console
• B. The audio panel
• C. The RF front end
• D. The overhead switch

Answer: (A)

Safety interlocks for mission radios are controlled at the system interface level, not in the hardware modules. For HF radios on the ground, the bypass of the weight-on-wheels safety feature is implemented through the physical MCDU in the center console because this is the dedicated control point for the mission radio subsystem. The MCDU provides the authorized, logged way to enable maintenance or ground operations that would otherwise be blocked by WOW interlocks, ensuring deliberate action and traceability.

The audio panel is where you route and manage crew communications, not safety interlocks. The RF front end is the tuner hardware that selects frequencies, not the interlock controller. An overhead switch would be a general cockpit control but typically does not provide the formal, auditable bypass capability required for HF ground operations.