737-600/700/800/900 TRAINING MANUAL
00-00-00-323 Rev 1 03/20/1997
DOWNLOCK SPRING (2)
DOWNLOCK ACTUATOR
REACTION LINK
DOWNLOCK PIN HOLE
UPPER STRUT SIDE STRUT
DOWNLOCK
LEFT MAIN LANDING GEAR (LOOKING FORWARD)
FWD
737 GENERAL - MAIN LANDING GEAR DOWNLOCK PIN
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737-600/700/800/900 TRAINING MANUAL 737 GENERAL -- NOSE LANDING GEAR DOWNLOCK PIN General
You install a downlock pin into the nose landing gear (NLG) to prevent an outside force from unlocking the nose landing gear.
There is one nose landing gear downlock pin for the nose landing gear.
The nose landing gear downlock pin installs in the NLG downlock pin hole.
WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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737-600/700/800/900 TRAINING MANUAL
00-00-00-324 Rev 1 03/21/1997
UPPER DRAG BRACE
AFT LOCK LINK FORWARD LOCK LINK
FWD
FWD NLG DOWNLOCK PIN HOLE LOWER DRAG BRACE
NOSE LANDING GEAR NOSE LANDING GEAR LOCKING MECHANISM
00-00-00 737 GENERAL - NOSE LANDING GEAR DOWNLOCK PIN
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737 GENERAL -- TOWING LEVER General
A towing lever permits you to depressurize the nose wheel steering system. Because of this, you do not have to depressurize hydraulic system A to tow the airplane.
The towing lever is on the left side of the metering valve module above the steering actuator.
Operation
The towing lever is spring-loaded to the off position. Move the lever forward to the tow position. Insert a pin in the pin hole in the lever to hold the lever in the towing position. A placard on the protective cover (not shown) shows the two positions of the towing lever.
If you tow the airplane and turn the nose wheels more than 78 degrees, you must disconnect the torsion links. Support the lower torsion link from dragging on the ground when it is disconnected.
A red stripe on the outside of each nose landing gear door shows when the wheels are at 78 degrees. When the tow bar aligns with the red stripe, the wheels are at 78 degrees.
If you tow the airplane and turn the nose wheels more than 90 degrees, you must disconnect the taxi light wire bundle.
737-600/700/800/900 TRAINING MANUAL
WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE NOSE GEAR UNTIL THE NOSE GEAR IS CENTERED. A FAST MOVEMENT OF NOSE GEAR CAN OCCUR IF THE HYDRAULIC SYSTEM IS PRESSURIZED WHEN THE LOCKOUT PIN IS REMOVED. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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737-600/700/800/900 TRAINING MANUAL
00-00-00-329 Rev 1 03/21/1997
TOWING
LEVER
FWD
NOSE LANDING GEAR
TOWING
LEVER
PIN HOLE
STRIPE TORSION NOSE WHEEL STEERING HYDRAULIC COMPONENTS LINKS (PROTECTIVE COVER REMOVED)
FWD
RED
737 GENERAL - TOWING LEVER
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737 GENERAL -- PARKING BRAKE SYSTEM Purpose
The parking brake system uses the normal hydraulic brake system to keep the main landing gear brakes applied when you park the airplane.
Parking Brake System Indication
A red parking brake light next to the parking brake lever shows the condition of the parking brake system.
A brake pressure indicator shows the available brake pressure.
Operation
To set the parking brakes, push the brake pedals and pull the parking brake lever. The linkage latches the brake pedals in the brakes-applied position.
A fully charged brake accumulator shows 3000 PSI on the brake pressure indicator. This keeps the brakes pressurized for at least 8 hours.
Training Information Point
CAUTION: PARKING BRAKES SHOULD NOT BE SET FOLLOWING A HIGH ENERGY STOP. HIGH ENERGY STOPS ARE DEFINED AS A REFUSED TAKE OFF OR ANY STOP OTHER THAN NORMAL. UNDER STATIC PRESSURE, HOT BRAKE SURFACES TEND TO FUSE TOGETHER.
737-600/700/800/900 TRAINING MANUAL
THEREFORE, AFTER A HIGH ENERGY STOP, OR FOLLOWING TOUCH AND GO STOPS, A COOLING PERIOD OF 40 TO 60 MINUTES SHOULD BE ALLOWED BEFORE THE PARKING BRAKE IS SET.
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737-600/700/800/900 TRAINING MANUAL
00-00-00-034 Rev 1 12/23/1997
3 2
4 BRAKE
1
PRESS
0 BRAKE PRESSURE INDICATOR
BRAKE
PARKING
PEDALS (4) BRAKE LEVER
PARKING BRAKE LIGHT
CONTROL STAND 737 GENERAL - PARKING BRAKE SYSTEM
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