At what speed does the anti-skid system become operational?

At what speed does the anti-skid system become operational?

• A. 35 Knots
• B. 15 Knots
• C. 50 Knots
• D. 75 Knots

Answer: (C)

Anti-skid prevents tire skidding by constantly monitoring wheel speeds and modulating brake pressure to keep all wheels turning at a similar rate. It only becomes active once the airplane is on the ground and the wheels are turning fast enough to give reliable slip information, so it won’t interfere during slow taxi or in flight. On the CRJ-550, this means the system starts working during the higher-speed portion of the ground roll when braking is being used, so it can detect a tendency for a wheel to lock and automatically reduce pressure on that wheel. If a wheel tends to slow too much relative to the others, the system briefly releases and then reapplies braking to maintain control and steering. In short, anti-skid turns on once you’re on the ground and the wheels are moving at a sufficient speed during the ground roll, not during very slow taxi or flight.

Anti-skid prevents tire skidding by constantly monitoring wheel speeds and modulating brake pressure to keep all wheels turning at a similar rate. It only becomes active once the airplane is on the ground and the wheels are turning fast enough to give reliable slip information, so it won’t interfere during slow taxi or in flight. On the CRJ-550, this means the system starts working during the higher-speed portion of the ground roll when braking is being used, so it can detect a tendency for a wheel to lock and automatically reduce pressure on that wheel. If a wheel tends to slow too much relative to the others, the system briefly releases and then reapplies braking to maintain control and steering. In short, anti-skid turns on once you’re on the ground and the wheels are moving at a sufficient speed during the ground roll, not during very slow taxi or flight.