LANDING GEAR AND
BRAKES
AIRPLANE
OPERATIONS
MANUAL
2-12-10
Page
6
Code
01
REVISION 40
AOM-145/1114
TOUCHDOWN PROTECTION
The touchdown protection system inhibits brake actuation before the
main wheels spin up during landing. Brake actuation will be allowed
only after 3 seconds from the latest touchdown or after the wheels
have spun-up to 50 kt. In bouncing landings, the countdown is reset
after each runway contact.
Touchdown protection is provided by the brake system receiving
signals from main landing gear weight-on-wheel proximity switches. If
one landing gear proximity switch fails at the air position, the brake
system will operate normally. However, if both proximity switches fail
at the air position, braking capacity will be available only for wheel
speeds above 10 kt.
Below 10 kt, a loss of the main brake capacity will occur, but
emergency braking is still available.
GEAR-RETRACTING-IN-FLIGHT BRAKING
Gear-retracting-in-flight braking prevents the landing gear from being
retracted when the wheels are turning. This system computes signals
from the air/ground indicating system and from the landing gear lever
position. As soon as the airplane is airborne and the gears are
commanded to retract, it applies braking pressure to the main wheels.
The nose wheels are braked by a stop within the nose landing gear
wheel well.
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