(a)
Open the 125B access door to the E-6 shelf on the bottom side side of the fuselage.
NOTE: The door is immediately forward of the air conditioning
____
packs.
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747-400
MAINTENANCE MANUAL
Installation of the Brake Temperature Monitor Unit (BTMU)
Figure 401
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CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE
_______ BTMU. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE BTMU.
(b)
Install dust caps on the electrical connectors (AMM 20-41-01/201).
(c)
Remove the clamps from the BTMU (2 locations).
(d)
Remove the BTMU from the E6 shelf (AMM 20-11-22/401).
TASK 32-46-03-424-009
3. Brake Temperature Monitor Unit - Installation (Fig. 401)
_____________________________________________
A. General
(1)
You must do the ground test for the Brake Temperature Monitoring System (BTMS) after the installation of a replacement BTMU.
B.
References
(1)
AMM 20-11-22/401, Rack Mounted Electrical/Electronic Modules
(2)
AMM 20-41-01/201, Static Sensitive Devices
(3)
AMM 32-46-00/501, Brake Temperature Monitoring System
(4)
IPC 32-46-00 Fig. 1
(5)
Location Zones 118 Electrical & Electronics Compartment, RH (P180 DC Power Distribution Panel)
125 Area Below Forward Cargo Container Compartment, LH (BTMU location)
(6)
Access Panel
125B Access Electronics
C.
Procedure
S 424-010
(1)
Install the BTMU:
(a)
Open the 125B access door to the E-6 shelf on the bottom side side of the fuselage.
NOTE: The door is immediately forward of the air conditioning
____
packs.
CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE
_______ BTMU. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE BTMU.
(b) Remove the dust caps from the electrical connectors (AMM 20-41-01/201).
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(c) Install the BTMU in the E6 shelf (AMM 20-11-22/401).
(2) S 864-011Remove the DO-NOT-CLOSE tag and close this circuit breaker: (a) P180 DC Power Distribution Panel 1) 180J10 BRAKE TEMP IND
(3) S 734-012Do this task: "Brake Temperature Monitoring System - Ground Test" (Ref 32-46-00/501).
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747-400 MAINTENANCE MANUAL
STEERING - DESCRIPTION AND OPERATION
____________________________________
1. General_______
A. Steering systems for the nose gear and body gear provide airplane directional control during ground maneuvers and taxiing. Body gear steering also reduces tire scrubbing when the airplane is turned with nose wheel angles greater than | 20 degrees. Hydraulic system No. 1 provides power for both nose and body gear steering systems.
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