(b)
If electrical power is not available, close the module as follows: 1) Open the 6L18 PARK BRAKE circuit breaker on the P6 panel. 2) Move the parking brake module, manual override lever, to
position 1 (closed).
NOTE: The manual override lever is found in the body
____ gear wheel well.
TASK 09-11-00-582-018
3. Tow the Airplane (Usual - Body Landing Gear Centered and Locked)
________________
A. General
(1) It is optional to tow the airplane with the entry or cargo doors open.
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747-400
MAINTENANCE MANUAL
CAUTION: WHEN YOU TOW AN AIRPLANE WITH A GROSS WEIGHT MORE THAN 778,000
_______ POUNDS, LIMIT THE NOSE GEAR TOWING ANGLE TO A MAXIMUM OF 65 DEGREES. IF YOU HAVE DISCONNECTED THE TORSION LINKS AND YOU MUST TURN THE AIRPLANE GREATER THAN 65 DEGREES, MAKE SURE YOU DO NOT DAMAGE THE STRAIN GAGE WIRING INSTALLATION ON THE AFT SIDE OF THE NOSE GEAR.
DO NOT OVER-ROTATE INTO THE ORANGE MARKER. DAMAGE TO THE TILLER ASSEMBLY OR STEERING ACTUATORS CAN OCCUR.
(2) You must monitor a turn at or near 65 degrees.
NOTE: There is a painted stripe on the nose gear outer cylinder
____ that will align with a painted stripe on the inner cylinder when the nose gear turning angle is at 60 degrees. The marks are on the both the forward and aft side of the nose gear, however, not all airplanes have the painted stripe due to the airplanes configuration and paint.
CAUTION: IF YOU USE A TOW BAR, YOU CAN CAUSE THE SHEAR PINS TO SHEAR IF
_______ YOU USE THE AIRPLANE BRAKES WHILE YOU TOW THE AIRPLANE. MOST TOWBARLESS TOW VEHICLES DO NOT HAVE A SHEAR PIN TO LIMIT THE LOADS IF AIRPLANE BRAKES ARE USED DURING TOWING. IF AIRPLANE BRAKES ARE USED WHILE TOWING WITH A TOWBARLESS TOW VEHICLE ATTACHED TO THE NOSE LANDING GEAR, PERFORM THE "HARD LANDING OR HIGH DRAG/SIDE LOAD LANDING CONDITION" INSPECTION FOR THE NOSE LANDING GEAR AREAS (REF 05-51-05).
(3) When you tow the airplane, do not use the airplane brakes to stop the airplane, unless it is an emergency.
B. References
(1) 32-53-00, Body Gear Steering System
C. Procedure
S 842-011
(1)
Prepare to tow the airplane (see par. 2).
S 862-075
(2)
Make sure the body landing gear are centered and locked
(Ref 32-53-00).
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747-400 MAINTENANCE MANUAL
S 582-012
WARNING:_______ IF YOU LOSE HYDRAULIC POWER ON THE AIRPLANE WHILE YOU ARE
TOWING THE AIRPLANE, YOU MUST TELL THE TOW VEHICLE OPERATOR.
YOU MUST DECREASE THE TOW SPEED OR STOP TOWING, IF IT IS
NECESSARY. IF YOU HAVE A DECREASE IN HYDRAULIC POWER, ONLY
ACCUMULATOR PRESSURE WILL BE AVAILABLE FOR BRAKE OPERATION.
IF YOU HAVE A DECREASE IN HYDRAULIC POWER WHILE TOWING, DO NOT
APPLY THE BRAKES EXCEPT IN AN EMERGENCY OR UNTIL THE AIRPLANE
IS PARKED. SMALL PRESSURE ON THE PEDAL ENDS WILL CAUSE A
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