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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.
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 
Pack Valves  With one pack operating, regulates to high flow with flaps up.  With one pack operating, regulates to high flow only when pack is operating from the APU and both engine bleed switches are OFF.  2 
Pressurization  Allows programmed pressurization in the automatic modes.  Allows pressurization only at high power settings.  2 

Copyright . The Boeing Company. See title page for details.
14.20.6  September 29, 2005

Landing Gear -System Description 737 Flight Crew Operations Manual
SYSTEMS  NORMAL INFLIGHT OPERATION  NORMAL ON GROUND OPERATION  REFER TO CH 
Ram Air  Ram Air fans operate whenever air conditioning packs operate.  Ram Air fans operate whenever air conditioning packs operate. Deflectors are extended.  2 
Wing Anti–ice  Control valves open when switch is ON. Thrust setting and duct temperature logic is bypassed.  With switch ON, valves cycle open and closed. Switch trips to OFF at lift–off.  3 
Autothrottle  Enables go–around below 2000 ft radio altitude.  Disengaged 2 seconds after landing. Takeoff mode enabled.  4 
TO/GA switch  Flight director engages go–around mode.  Flight director engages takeoff mode.  4 
ACARS  Sends out signal on strut extension for takeoff signal.  Sends out signal on strut compression for landing signal.  5 
Voice Recorder  Prevents tape erasure.  Allows tape erasure when parking brake is set.  5 
Engine Idle Control  Enables minimum flight idle.  Enables minimum ground idle.  7 
Thrust Reverser  Thrust reverse disabled.  Thrust reverse enabled.  7 
APU Fire Horn  Wheel well horn disabled.  Wheel well horn enabled.  8 

YA613, YA626, YA721, YA722, YC153 - YC413, YK101 - YK104
Cargo Fire  Second extinguishing  Second extinguishing bottle  8 
Protection  bottle timer enabled.  timer disabled. 

Speed Brake Lever Actuator  Can be armed to raise ground spoilers for landing.  Activates SPEED BRAKE lever on landing if armed. Rejected take–off feature available. Drives to DOWN when thrust lever advanced.  9 
Auto Slat  System enabled with flaps 1, 2, or 5 selected. PTU available if system B pressure is lost.  System disabled.  9 

Copyright . The Boeing Company. See title page for details.
September 29, 2005  14.20.7
Landing Gear -System Description 737 Flight Crew Operations Manual

SYSTEMS  NORMAL INFLIGHT OPERATION  NORMAL ON GROUND OPERATION  REFER TO CH 
Flight Recorder  Operates anytime electrical power is available.  Operates anytime electrical power is available and either engine is operating.  10 
FMC  FMC position updated from GPS, DME or VOR/DME.  FMC position updated from GPS.  11 
Standby Hydraulic  Pump automatic operation with flaps extended and A or B pressure lost.  Wheel speed must be greater than 60 knots for automatic operation.  13 
Antiskid  Releases normal or alternate brakes for touchdown protection.  Allows normal antiskid braking after wheel spin–up.  14 
Autobrakes  Allows selection of landing mode.  RTO mode available and landing mode may be selected after touchdown if wheel speed is greater than 60 knots.  14 
Landing Gear Lever Lock  Lever lock solenoid released.  Lever lock solenoid latched.  14 
Landing Gear Transfer Unit  Enabled.  Disabled.  14 
Stall Warning  Enabled.  Disabled.  15 
Takeoff Warning  Disabled.  Enabled.  15 
　
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