09-11-00
ALL ú ú 08 Page 225 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
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 862-024
(4)
Close the 6L18 PARK BRAKE circuit breaker on the P6 panel.
(5)
Set the parking brake.
S 862-067
NOTE: If the Brake Temp display shows on EICAS, release the
____ parking brake after the wheel chocks are in location.
S 782-025
(6) Make sure the HYD BRAKE PRESS gage shows approximately 3000 psi.
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09-11-00
ALL ú ú 08 Page 226 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 842-028
(7) Put the airplane to it's usual condition (see par. 12).
TASK 09-11-00-582-029
5. Tow the Airplane (Emergency)________________
A. General
(1)
When you move the airplane after it has gone off the runway, taxiway, or parking strip, gear tow loads near maximum can possibly be applied to each gear. This procedure assumes that no damage has occurred to the landing gear. Also, the airplane cannot be moved by nose gear towing without causing the nose gear towing load to exceed the maximum limit (Fig. 202).
WARNING:_______YOU WANT TO PREVENT DAMAGE FROM TOW CABLES IF THEY BREAK. YOU CAN CONNECT MANILA ROPE TO THE CABLES TO PREVENT THE CABLE FROM FAST MOVEMENT IF THE CABLE BREAKS OR THE SHEAR LINK FAILS. THIS CAN PREVENT INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
You must use 98,200-pound shear links when you tow the wing and body main landing gear with a cable.
(3)
You must use a 131,000-pound shear link when you tow the nose gear with a cable.
B. Procedure
S 842-030
(1) Prepare to tow the airplane (see par. 2).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
09-11-00
ALL ú ú 08 Page 227 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 582-077
WARNING:_______ IF YOU LOSE HYDRAULIC POWER ON THE AIRPLANE WHILE YOU ARE
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