_______CAUTION: ABRUPT STARTS OR STOPS DURING TOWING, ROUGH OR SOFT RUNWAYS, OR SHARP TURNS, WILL LET
THE WHEEL FLANGES TOUCH RUNWAY SURFACES. THIS CAN CAUSE DAMAGE TO BEAMS, TORQUE ARMS,
WHEEL/BRAKE ASSEMBLIES AND OTHER LANDING GEAR COMPONENTS.
____ ABOVE LIMITATIONS ARE FOR AIRPLANES BELOW OR AT THE MAXIMUM LOAD CONDITIONS.NOTE:
Tow Airplane with Flat Tires
Figure 211
U20804
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747-400
MAINTENANCE MANUAL
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)
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.
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 862-062
(3)
Close the 6L18 PARK BRAKE circuit breaker on the P6 panel.
(4)
Set the parking brake.
S 862-063
NOTE: If the Brake Temp display shows on EICAS, release the
____
brake after the wheel chocks are in location.
S 782-064
(5) Make sure the HYD BRAKE PRESS gage shows approximately 3000 psi.
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747-400 MAINTENANCE MANUAL
S 842-071
(6) Put the airplane to it's usual condition (see par. 12).
TASK 09-11-00-582-076
11. Tow the Airplane in High Wind_____________________________
A. Procedure
S 582-096
(1) You can tow the airplane in high wind. You must obey the conditions specified in Fig. 212.
TASK 09-11-00-842-072
12. Put the Airplane to It's Usual Condition________________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
29-11-00/201, Main Hydraulic Supply System
(3)
AMM 32-21-03/201, Nose Gear Torsion Links
B. Procedure
S 862-094
(1)
Remove the pressure from the hydraulic systems No. 1 and 4 (Ref 29-11-00/201).
S 862-074
(2)
Remove electrical power, if it is not necessary.
(a)
To remove external power, disconnect the power cable from the external power receptacle No. 1 (Ref 24-22-00/201).
(b)
Do these steps to remove power supplied by the APU generators: 1) Remove APU generator power to the ground handling/ground
service busses (Ref 24-22-00/201). 2) Stop the APU (Ref 49-11-00/201).
S 432-075
(3) Connect the upper and lower landing gear torsion links, if it is necessary (Ref 32-21-03/201).
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