32-13-01
ALL ú ú 01 Page 603 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
INDEX NO. PART NAME DIM. DESIGN LIMITS WEAR LIMITS PART REPLACE WORN REPAIR WORN PART INSTR REPAIR
DIAMETER DIM. WEAR MITTED PER- DIA CLEAR-ANCE MAX
MIN MAX
1 SUPPORT 1 ID 10.7500 10.7520 10.7540 0.0000
BEARING RACE OD 10.7520 10.7540 10.7520 X 2
2 BEARING ID 8.5030 8.5050 8.5120 0.0140 X 2
TRUNNION OD 8.4970 8.4980 8.4910 X 3
3 BUSHING ID 5.0000 5.0020 5.0065 0.0095 X
TRUNNION OD 4.9970 4.9980 4.9925 X 3
4 TRUNNION 5 5.7430 5.7470 5.7520 0.0120 X 7
BUSHING 6 5.7400 5.7410 5.7350 X 7
OUTBOARD TRUNNION SUPPORT
REFER TO 20-11-01/401 WHEN YOU INSTALL THE BEARING.
THE CHROME THICKNESS CAN NOT BE MORE THAN 0.010 INCHES.
THE MEASURED LIMIT CAN BE MORE THAN THE PERMITTED LIMIT IF THE MEASURED CLEARANCE IS
NOT MORE THAN THE MAXIMUM CLEARANCE.
THIS IS THE WIDTH OF THE GROOVE IN THE BODY GEAR TRUNNION.
THIS IS THE WIDTH OF THE BUSHING BETWEEN THE OUTER SIDES OF THE BUSHING FLANGES.
7 YOU CAN REPAIR THIS PART. REFER TO THE OVERHAUL MANUAL FOR REPAIR INSTRUCTIONS.
Wear Limits For the Body Landing Gear
Figure 601 (Sheet 3)
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747-400 MAINTENANCE MANUAL
TASK 32-13-01-216-007
3. Body Landing Gear External Inspection (Fig. 601)_____________________________________
A. Access
(1)
Location Zone
755 Body Landing Gear, LH
765 Body Landing Gear, RH
B.
Procedure
S 206-008
(1)
Do an external inspection of the components for the body landing gear.
(a)
Examine the shock strut, the drag strut, the side brace, and the wheel truck for corrosion and damage.
(b)
Examine all of the pin connections on the body landing gear for corrosion and damage.
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32-13-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
BODY LANDING GEAR SHOCK STRUT - MAINTENANCE PRACTICES
_____________________________________________________
1. General
_______
A. This procedure contains seven tasks:
(1)
The removal of the pressure gage from the shock strut
(2)
The installation of the pressure gage on the shock strut
(3)
The removal of the flow fuse and the shutoff valve from the shock strut
(4)
The installation of the flow fuse and the shutoff valve on the shock strut
(5)
The repair of a clogged flow fuse.
(6)
An inspection for seal leaks.
(7)
Inspection for scraper rings and replacement of the damaged scraper rings with optional split scraper rings.
B.
A pressure gage, a flow fuse, and a shutoff valve are on the shock strut of the body landing gear. The pressure gage gives a visual indication of the pressure in the shock strut. The flow fuse prevents fluid leakage if the gage or the hydraulic tube have damage. To isolate the pressure gage for servicing, you can use the shutoff valve to stop pressure from the shock strut.
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