07-11-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
JACKING AIRPLANE FOR FUEL LEAK TEST - MAINTENANCE PRACTICES
___________________________________________________________
1. General
_______
A. This procedure contains one task to lift the airplane on jacks to do a fuel leak test.
B. To lift the airplane on jacks, put the jacks at the eight locations to hold the airplane.
C. You can do a test of the fuel tank for leaks at the same time you do other maintenance or overhaul operations such as major component removal.
D. When you do this procedure the airplane must weigh approximately 350,000 pounds (158,700 kg) with the CG at 30% MAC (This is the normal weight and CG of a defueled airplane).
TASK 07-11-04-802-001
2. Lift Airplane on Jacks
______________________
A. General
(1) You can remove major components (engines, landing gear, etc.) during the leak test without danger of too much load on the jack points. However, removal must be in a symmetrical manner. You must remove the component on the left before and installed after the component on the right.
NOTE: This restriction is necessary because the left body jack
____ usually has a higher load than the right body jack. This is because of the unsymmetrical location of the tail jack.
(2) If you do not do a leak test at the same time as you remove major components, you do not have to follow the symmetrical removal rules.
B. Special Tools and Equipment
(1)
30MIT65B00112 Jack Adapter
(2)
36MIT65B00141 Jack Adapter
(3)
50MIT65B00112 Jack Adapter
C. Standard Tools and Equipment
(1) Wing and body jacks
D. References
(1)
07-11-01/201, Jacking Airplane
(2)
12-11-01/301, Servicing (Fuel Replenishing)
(3)
32-09-02/201, Air/Ground Relay System
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07-11-04
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
E. Access
(1) Location Zone 116 Area Between Nose Gear Well and Fuselage (Nose Jack Point) 550 Front Spar to Rear Spar From WS 994.500 to WBL 1249 (Outboard Wing Jack Point VII) 565 Inboard Flap Track Fairing - Outboard Flap, Left (Wing Jack Point IV) 650 Front Spar to Rear Spar From WS 944.500 to WBL 1249 (Outboard Wing Jack Point VIII)
665 Inboard Flap Track Fairing - Outboard Flap, Right (Wing Jack Point V)
F. Lift the Airplane
S 862-002
WARNING: YOU MUST CAREFULLY PUT THE AIR/GROUND RELAY SYSTEM IN THE AIR
_______ MODE. A FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1)
Put the air/ground relay system in the air mode (Ref 32-09-02/201).
S 582-003
(2)
Lift the airplane to the usual height on the three primary jacks (Ref 07-11-01/201).
S 492-004
(3)
Install the jack adapters at the jack points IV, V, VII, and VIII (Fig. 201).
S 492-005
(4)
Put all four of the wing auxiliary jacks in their position
(Fig. 201).
S 582-006
(5)
Put a load on each of the auxiliary wing jack points to a load not more than 2000 pounds (900 kg).
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07-11-04 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 LIFTING AND SHORING(17)
