737 Flight Crew Operations Manual
Landing Gear -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 14.20.5
The RTO mode is automatically disarmed when both air/ground systems indicate
the air mode. The AUTO BRAKE DISARM light does not illuminate and the
AUTO BRAKE select switch remains in the RTO position. To reset or manually
disarm the autobrake system, position the selector to OFF. If a landing is made
with RTO selected (AUTO BRAKE select switch not cycled through OFF), no
automatic braking action occurs and the AUTO BRAKE DISARM light
illuminates two seconds after touchdown.
Landing
When a landing autobrake selection is made, the system performs a turn–on– self–
test. If the turn–on–self–test is not successful, the AUTO BRAKE DISARM light
illuminates and the autobrake system does not arm.
Four levels of deceleration can be selected for landing. However, on dry runways,
the maximum autobrake deceleration rate in the landing mode is less than that
produced by full pedal braking.
After landing, autobrake application begins when:
• both forward thrust levers are retarded to IDLE
• the main wheels spin–up.
Note: Landing autobrake settings may be selected after touchdown prior to
decelerating through 30 kts of ground speed. Braking initiates immediately
if the above conditions are met.
To maintain the selected landing deceleration rate, autobrake pressure is reduced
as other controls, such as thrust reversers and spoilers, contribute to total
deceleration. The deceleration level can be changed (without disarming the
system) by rotating the selector. The autobrake system brings the airplane to a
complete stop unless the braking is terminated by the pilot.
Autobrake – Disarm
The pilots may disarm the autobrake system by moving the selector switch to the
OFF position. This action does not cause the AUTO BRAKE DISARM light to
illuminate. After braking has started, any of the following pilot actions disarm the
system immediately and illuminate the AUTO BRAKE DISARM light:
• moving the SPEED BRAKE lever to the down detent
• advancing the forward thrust lever(s), except during the first 3 seconds
after touchdown for landing
• applying manual brakes.
May 15, 2008
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