BODY TRUCKS POSITION OF PARKED PRESSURIZED SYSTEM HYDRAULIC NO. 1 POWER AVAILABLE ELECTRICAL (Fig. 208) EXIT PATH TOWING PROCEDURE COMMENTS AND
Steered No Yes or No B,F towed per paths B or F. above. Aircraft may then be given for paths A, G, and H and locked using procedure Body trucks must be centered
C,D,E No special towing procedure themselves as aircraft rolls. required. Body trucks will center and lock
Recommended Towing Procedures
Figure 210 (Sheet 4)
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747-400 MAINTENANCE MANUAL
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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 LOSS
OF HYDRAULIC BRAKE PRESSURE. A DECREASE IN HYDRAULIC PRESSURE
WILL LIMIT THE ABILITY OF THE BRAKE SYSTEM TO STOP THE
AIRPLANE.
CAUTION: DO NOT HOLD OR TURN THE NOSE WHEEL STEERING TILLER WHILE TOWING
_______ THE AIRPLANE.
(2) Tow the airplane (Ref 32-53-00/001).
NOTE: For airplane clearances during towing, see Fig. 207.
____
WARNING: WHEN YOU TOW THE AIRPLANE, ALL PERSONS MUST STAY OUT OF
_______ THE DANGEROUS AREAS AROUND THE TOW VEHICLE, TOW BAR, NOSE WHEELS, AND THE MAIN WHEELS. PERSONS ON THE GROUND MUST KNOW IT IS POSSIBLE TO BE RUN OVER BY THE NOSE WHEELS, MAIN WHEELS, AND THE TOW VEHICLE. THIS IS BECAUSE THE AIRPLANE WILL CHANGE POSITION DURING PUSHBACK AND TOWING. MAKE SURE YOU KEEP A MINIMUM OF 10 FEET SEPARATION BETWEEN PERSONS ON THE GROUND AND THE EQUIPMENT THAT MOVES. IF YOU DO NOT KEEP THE MINIMUN DISTANCE, A FATAL INJURY CAN OCCUR.
(a)
Make sure the persons that work near the areas that follow, know the pushback hazard zones as shown in Figure 207A:
-
tow vehicle
-
tow bar
-nose wheels
-main wheels.
(b)
To center the body landing gear trucks that have been parked in a steered position, do the steps that follow.
NOTE: This is when hydraulic power is not available.
____
1) Tow the airplane forward or aft with the nose gear steering angle set for the same direction turn as the body gear trucks.
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747-400
MAINTENANCE MANUAL
2) When the body landing gears center and lock, you can follow the normal towing procedures (par. 2 and 3).
(c) The main gear body trucks will center and lock when a straight path of 20- to 40-feet is used to get the airplane to the parked position.
NOTE: This will release torsional stress applied to the
____ landing gear components and tires during a turn.
CAUTION: IF YOU HAVE DISCONNECTED THE TORSION LINKS, MAKE SURE THE
_______ TORSION LINKS DO NOT DROP. DAMAGE TO THE SQUAT SWITCH MOUNTING BRACKET CAN OCCUR.
(d) If the torsion links were disconnected, align the links during the last few feet of the tow so that the torsion link bolt can be installed.
NOTE: The make the final adjustment of the torsion links,
____ move the tow bar sideways (if installed).
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(3)
Close the 6L18 PARK BRAKE circuit breaker on the P6 panel.
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(4)
Set the parking brake.
NOTE: If the Brake Temp display shows on EICAS, release the
____ parking brake after the wheel chocks are in location.
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