B.
Procedure
S 038-007
(1)
Remove the lubrication fitting from the lubrication retainer.
S 358-002
(2)
Drill a 0.261 (+0.007/-0.000) inch width hole in the lubrication retainer to the depth shown for dimension C minimum.
S 358-003
(3)
Countersink the hole 120 (| 5) degrees by 0.31 (| 0.02) inch diameter.
(4)
Use a tap to make threads for a 1/4-28 class 3B screw.
(5)
Install the MS124696 insert to the depth shown in dimension A.
(6)
Remove the insert tang.
S 358-004
S 438-005
S 038-006
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A
747-400
MAINTENANCE MANUAL
MS15001-2 ALEMITE
YOU CAN INSTALL THE FITTING OR INSERT ONLY IF IT DOES NOT COVER THE LUBRICATION CROSS HOLE (SEE TOP VIEW). MS15001-2 IS THE RECOMMENDED PART, SEE YOU CAN USE MS15001-2 OR ALEMITE 1652-B IF YOU CAN ACCESS THEM WITH A LUBRICATION GUN FOR BOTTOM TAP, USE DIMENSION B
NOTE: ALL DIMENSIONS ARE IN INCHES
Landing Gear Lubrication Retainer Repair
Figure 801
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747-400 MAINTENANCE MANUAL
S 438-008
(7) Install the lubrication fitting in the lubrication retainer.
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747-400 MAINTENANCE MANUAL
LANDING GEAR MULTIPLE USE SYSTEM/COMPONENTS - DESCRIPTION AND OPERATION
_______________________________________________________________________
1. General (Fig 1)_______________
A. The landing gear multiple use system/components supply data related to the landing gear and other airplane systems. The multiple use system/components are air/ground relays and proximity switch electronics unit (PSEU).
B. The air/ground relays operate as air/ground switches for airplane systems that operate different in the air than on the ground. The position of the landing gear tilt switches tells if the airplane is in the air or on the ground. The PSEU supplies this data to the air/ground relays. The air/ground relays are installed in the Left Power Distribution Center Panel or the Right Power Distribution Center Panel. These panels are in the main E/E equipment center. The air/ground relays need 28-volt power to operate. Bus 1, bus 2, and the battery bus supply power.
C. The PSEU is located at E1-3 in the main equipment center. Bus 1, bus 2, bus 3, bus 4, and the battery bus supply power to PSEU. The PSEU supplies the position and the control data for primary landing gear sensor, alternate landing gear sensor, thrust reverser, and auto restow subsystems. The position data comes from proximity sensors located on the landing gear. The control data goes to the relays that start or stop airplane systems.
D. Two subsystems are provided for the landing system, primary and alternate. The primary and alternate landing gear subsystems consist of:
-Proximity Switch Inputs
-Discrete Inputs
-
Logic Functions Outputs The two subsystems have identical channel assignments with different sensor identifications assignments. Each subsystem has its own power source. One subsystem does not have the priority over the other, they are the redundant systems. If a failure occurs, one subsystem can lose power with no effect to the others.
E. 中國航空網 m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：747-400 AMM 飛機維護手冊 起落架 LANDING GEAR 1(40)
