PANEL, P180
BRAKE TEMPERATURE MONITOR UNIT, M915
E6
FWD

CENTER EQUIPMENT CENTER
A

MAIN EQUIPMENT CENTER B
Brake Temperature Monitor System - Component Location
Figure 102 (Sheet 1)

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A

747-400
FAULT ISOLATION/MAINT MANUAL

BRAKE TEMPERATURE COMPENSATOR,
X288 (L WING GEAR)
X289 (L BODY GEAR)
X290 (R BODY GEAR)
X291 (R WING GEAR)

JUNCTION
BOX TERMINAL STRIP, T247 (L WING GEAR) T367 (L BODY GEAR) T371 (R BODY GEAR) T375 (R WING GEAR)
JUNCTION BOX D
NOTE:THE WING GEAR IS SHOWN, THE BODY GEAR IS ALMOST THE SAME.
BRAKE TEMPERATURE SENSOR
SEE E
SHOCK STRUT
(REF)
JUNCTION BOX, J6 (L BODY GEAR) J5 (R BODY GEAR) J8 (L WING GEAR) J7 (R WING GEAR)
SEE D
BRAKE TEMPERATURE SENSOR, T518 (L WG RR WHEEL) T519 (L WG RF WHEEL) T520 (L WG LF WHEEL) T521 (L WG LR WHEEL) T522 (L BG RR WHEEL) T523 (L BG RF WHEEL) T524 (L BG LF WHEEL) T525 (L BG LR WHEEL) T526 (R BG RR WHEEL) T527 (R BG RF WHEEL) T528 (R BG LF WHEEL) T529 (R BG LR WHEEL) T530 (R WG RR WHEEL) T531 (R WG RF WHEEL) T532 (R WG LF WHEEL) T533 (R WG LR WHEEL)
MAIN GEAR
C FROM SHT 1

AXLE (REF) BRAKE PISTON HOUSING (REF)
BRAKE TEMPERATURE SENSOR E
Brake Temperature Monitor System - Component Location
Figure 102 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 BRAKE TEMPERATURE MONITORING SYSTEM - ADJUSTMENT/TEST
_____________________________________________________
 1.  General_______
 A.  This procedure has two tasks:
 (1)  
The ground (BITE) test for the Brake Temperature Monitoring System (BTMS)

 (2)  
The system test for the BTMS.

 B.  
Each task uses the Central Maintenance Computer (CMC) and the EICAS display to do the tests.

 TASK 32-46-00-745-001
 2.  Brake Temperature Monitoring System - Ground Test_________________________________________________
 A.  General
 (1)  
This task uses the Central Maintenance Computer (CMC) and the EICAS display to verify the proper operation of the the Brake Temperature Monitoring System (BTMS). It also verifies the interfaces with all 16 brake temperature sensors and all 4 temperature compensators.

 (2)  
With a S283U004-5 BTMU, a brake temperature sensor and/or compensator wire shorted to the structure will blank the EICAS temperature indications for the brakes on that gear. Failure messages for that gear's four brake temperature sensors and associated temperature compensator will be recorded in the CMC. The EICAS indication of the remaining twelve brake temperatures will not be affected if no other failure exists.

 (3)  
When you are performing this test, the brake temperature of all 16 brakes displayed on the EICAS gear maintenance and synoptic pages will change to a "5 or greater". The "BRAKE TEMP" message will also display for 10 seconds.

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 C.  
Access

 (1)  
Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH

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747-400 MAINTENANCE MANUAL
 D.  Preconditions
 S 865-055
 (1)  
These conditions are necessary for this task:

 (a)  
Electrical power is available (AMM 24-22-00/201).
　
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