NO. INDEX PART NAME DIM. DESIGN LIMITS WEAR LIMITS WORN PART REPLACE PART WORN REPAIR INSTR REPAIR
DIAMETER PER-WEAR MITTED DIM. 6 DIA MAX ANCE CLEAR-
MIN MAX
1 BUSHING ID 1.2495 1.2510 1.2540 0.0070 X 1
SPACER OD 1.2490 1.2496 1.2470 X
2 BEARING ID 1.2495 1.2500 1.2530 0.0070 X
SPACER OD 1.2490 1.2496 1.2560 X
3 BEARING ID 0.9995 1.0000 1.0035 0.0065 X
BOLT OD 0.9992 0.9997 0.9970 X
4 BUSHING ID 0.9995 1.0005 1.0032 0.0065 X 2
BOLT OD 0.9992 0.9997 0.9967 X
5 SPACER ID 0.8751 0.8757 0.8783 0.0065 X
BOLT OD 0.8744 0.8750 0.8718 X
6 BUSHING ID 0.5000 0.5015 0.5030 0.0055 X 3
BOLT OD 0.4985 0.4995 0.4975 X
7 BUSHING ID 0.5015 0.5030 0.5035 0.0055 X
BOLT OD 0.4985 0.4995 0.4980 X
8 BUSHING ID 0.7500 0.7515 0.7530 0.0060 X 4
BUSHING OD 0.7480 0.7490 0.7470 X
9 BEARING ID 0.4995 0.5000 0.5020 0.0055 X
BOLT OD 0.4985 0.4995 0.4965 X
Wear Limits of the Forward Door Bellcrank for the Nose Wheel Well
Figure 601 (Sheet 3)
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747-400
MAINTENANCE MANUAL
NO. INDEX PART NAME DIM. DESIGN LIMITS WEAR LIMITS WORN PART REPLACE PART WORN REPAIR INSTR REPAIR
DIAMETER PER-WEAR MITTED DIM. 6 DIA MAX ANCE CLEAR-
MIN MAX
10 BUSHING ID 0.7500 0.7515 0.7530 0.0060 X 4
BOLT OD 0.7480 0.7490 0.7470 X
11 BUSHING ID 1.0000 1.0015 1.0025 0.0065 X 5
BUSHING OD 0.9970 0.9980 0.9860 X
INSTALL BUSHING PER 20-11-01 WITH TOUCH FIT OF 0.0007-0.0027 INCH. MAXIMUM OVERSIZE
BUSHING AND HOLE IN FITTING IS 1.520 INCH, IF IT IS NECESSARY.
INSTALL BUSHING PER 20-11-01 WITH TOUCH FIT OF 0.0005-0.0025 INCH. MAXIMUM OVERSIZE
BUSHING AND HOLE IN FITTING IS 1.230 INCH, IF IT IS NECESSARY.
INSTALL BUSHING PER 20-11-01 WITH TOUCH FIT OF 0.0003-0.0018 INCH. MAXIMUM OVERSIZE
HOLE IN FITTING IS 0.767 INCHES, IF IT IS NECESSARY.
INSTALL BUSHING PER 20-11-01 WITH TOUCH FIT OF 0.0004-0.0023 INCH. MAXIMUM OVERSIZE
BUSHING AND HOLE IN FITTING IS 1.079 INCH, IF IT IS NECESSARY.
INSTALL BUSHING PER 20-11-01 WITH TOUCH FIT OF 0.0005-0.0025 INCH. MAXIMUM OVERSIZE
BUSHING AND HOLE IN FITTING IS 1.277 INCH, IF IT IS NECESSARY.
YOU CAN HAVE MORE THAN THE LIMITS SHOWN IF YOU DO NOT HAVE MORE THAN THE MAXIMUM CLEARANCE.
Wear Limits of the Forward Door Bellcrank for the Nose Wheel Well
Figure 601 (Sheet 4)
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747-400 MAINTENANCE MANUAL
EXTENSION AND RETRACTION - DESCRIPTION AND OPERATION
____________________________________________________
General
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A. The extension and retraction of all landing gear and the applicable wheel well doors operates hydraulically. The movement of the shock struts of the landing gear operates the shock strut doors. A safety solenoid stops the movement of the control lever for the landing gear to the up position. This occurs when the indication from the position sensors of the landing gear show the airplane is on the ground.
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本文链接地址：747-400 AMM 飞机维护手册 起落架 LANDING GEAR 4(13)
