(b)
Before you park the airplane, complete towing with a 12-foot straight path.
NOTE: This will release torsional stress applied to the
____
landing gear components and tires during a turn.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
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.
(c) 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: To make the final adjustment of the torsion links,
____ move the tow bar sideways (if installed).
S 862-052
(7)
Close the 6L18 PARK BRAKE circuit on the P6 panel.
S 862-051
(8)
Set the parking brake.
NOTE: If the Brake Temp display shows on EICAS, release the
____ parking brake after the wheel chocks are in location.
S 782-053
(9)
Make sure the HYD BRAKE PRESS gage shows approximately 3000 psi.
S 842-052
(10)
Put the airplane back to it's usual condition (see par. 12).
TASK 09-11-00-862-053
9. Tow the Airplane (Maximum Weight 500,000 Pounds) Supported by the Nose and
__________________________________________________________________________ Wing Gear
_________
A. References
(1)
12-15-03/301, Wing Landing Gear Shock Strut
(2)
12-15-05/301, Nose Landing Gear Shock Strut
(3)
12-15-06/301, Landing Gear Tire
B. Procedure
S 842-054
(1)
Prepare to tow the airplane (see par. 2).
(2)
Make sure that the center of gravity is not aft of 24% MAC.
S 862-055
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 212-087
CAUTION:_______ AT THIS WEIGHT AND GEAR CONDITION, TOW THE AIRPLANE STRAIGHT
FORWARD OR STRAIGHT BACK. IF YOU MUST TURN THE AIRPLANE;
FIRST, FOLLOW A STRAIGHT PATH, AND THEN USE THE MINIMUM TURN
ANGLE NECESSARY. START THE TURN AFTER THE AIRPLANE HAS STARTED
TO MOVE. DO NOT MAKE A TURN THAT IS LARGER THAN 15 DEGREES.
DAMAGE TO THE LANDING GEAR CAN OCCUR.
(3)
Make sure that the nose gear steering linkage is connected.
S 862-057
(4)
Make sure that the nose and wing gear are serviceable (Ref 12-15-03/301, 12-15-05/301).
S 782-058
(5)
Make sure that the tire pressures are correct (Ref 12-15-06/301).
S 582-083
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 YOU
_______ TOW THE AIRPLANE.
CAUTION: IN THIS CONFIGURATION, DO NOT USE THE AIRPLANE BRAKES TO TURN
_______ OR STOP THE AIRPLANE. DAMAGE TO THE LANDING GEAR CAN OCCUR.
(6) Tow the airplane. NOTE: For airplane clearances while towing, see Fig. 207.
____
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