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.
14.20.6 D6-27370-866-EGP
Parking Brake
The parking brake can be set with either A or B hydraulic systems pressurized. If
A and B hydraulic systems are not pressurized, parking brake pressure is
maintained by the brake accumulator. Accumulator pressure is shown on the HYD
BRAKE PRESS indicator.
The parking brake is set by depressing both brake pedals fully, while
simultaneously pulling the PARKING BRAKE lever up. This mechanically
latches the pedals in the depressed position and commands the parking brake valve
to close.
The parking brake is released by depressing the pedals until the PARKING
BRAKE lever releases. A fault in the parking brake system may cause the
ANTISKID INOP light to illuminate.
(SB Changes YK982)
The takeoff configuration warning horn sounds if either forward thrust lever is
advanced for takeoff with the parking brake set.
YK981, YK983 - YW274
(SB Changes YK982)
The TAKEOFF CONFIG lights illuminate and the takeoff configuration warning
horn sounds if either forward thrust lever is advanced for takeoff with the parking
brake set.
Air/Ground System
In flight and ground operation of various airplane systems are controlled by the
air/ground system.
The system receives air/ground logic signals from six sensors, two on each
landing gear. These signals are used to configure the airplane systems to the
appropriate air or ground status.
Air/Ground System Logic Table
SYSTEMS
NORMAL INFLIGHT
OPERATION
NORMAL ON GROUND
OPERATION
REFER
TO CH
Emergency
Exit Doors
Flight locks engaged
when either engine N2 is
more than 50% and 3 or
more Entry/Service
doors are closed.
Flight locks disengaged
when either thrust lever is
set below approximately
53 degrees.
1
September 15, 2016
To Next Page
Loading...
