Brake operations should be able to handle emergencies such as which scenario?

• A. Be able to handle emergencies such as a heavy weight take off and aborted or rejected takeoff at the last possible moment
• B. Provide automatic braking during taxi only
• C. Require no maintenance
• D. Operate only at high altitudes

Answer: (A)

Brakes must be capable of handling the most demanding emergency on the takeoff run: a heavy-weight takeoff where an abort or rejected takeoff is executed at the last possible moment. In this scenario the aircraft is moving fast and loads are high, so the braking system must deliver rapid, stable deceleration, prevent tire lockups, and bring the airplane to a controlled stop within the remaining runway length. Redundancy and proper brake modulation (and anti-skid systems) are essential to maintain controllability under these extreme conditions.

Automatic braking during taxi only doesn’t address the major emergency during the takeoff roll, where deceleration from high speed is required. Requiring no maintenance is unrealistic for any braking system, since components wear and must be inspected and serviced. Operating only at high altitudes is irrelevant to the emergency braking needs on the runway.