Which cockpit component houses the weight-on-wheels bypass control for HF operation?

• A. The physical MCDU in the center console
• B. The main display unit
• C. The keypad on the radio
• D. The flight management computer

Answer: (A)

The weight-on-wheels bypass control is a cockpit control used to override the normal weight-on-wheels sensing so HF operation can be enabled when needed. It’s placed on the physical MCDU in the center console because the MCDU serves as the centralized interface for radio configuration and related controls. Having the bypass switch there allows quick access for the crew during radio checks and ground operations without navigating through displays or separate radio panels.

The main display unit is for showing information, not for controlling HF bypass. The keypad on the radio handles frequency input, not the bypass function. And the flight management computer handles navigation and flight planning, not HF bypass control.