*
Disconnect the brake line
*
Remove the brake.
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WHEELS, BRAKES, AND TIRES -MAIN LANDING GEAR WHEEL BRAKES
If the brake is removed or the brake line is disconnected, the gear must remain down for two minutes before retraction.
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WHEELS, BRAKES, AND TIRES -MAIN LANDING GEAR WHEEL BRAKES
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777 AIRCRAFT MAINTENANCE MANUAL
THIS PAGE IS INTENTIONALLY LEFT BLANK
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
BRAKE TEMPERATURE MONITORING SYSTEM -INTRODUCTION
Purpose
The brake temperature monitoring system (BTMS) gets brake temperature inputs from the twelve main gear brakes and supplies this data for flight deck indication.
Components
These are the brake temperature monitoring system components:
*
Brake temperature sensor (12)
*
Brake temperature compensation module (2)
*
Brake temperature monitor unit (BTMU).
General Description
Brake temperature sensors send brake temperature data through the brake temperature compensation modules to the BTMU. The compensation modules supply a reference ambient temperature.
The BTMU sends brake temperature data to the AIMS through the left ARINC 629 system bus.
The multi-function display (MFD) shows brake temperature data on the landing gear synoptic display and on the landing gear brakes/steering maintenance page.
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BRAKE TEMPERATURE MONITORING SYSTEM -INTRODUCTION
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BRAKE TEMPERATURE MONITORING SYSTEM -SENSOR AND COMPENSATION MODULE
Brake Temperature Sensor
The brake temperature sensor is a thermocouple. It sends a brake temperature signal through the brake temperature compensation module to the BTMU.
A brake temperature sensor is near the bottom of the brake in each of the main gear brake assemblies.
Brake Temperature Compensation Module
The brake temperature compensation modules connect the thermocouple wire to the aircraft wiring.
Two reference temperature sensors in each brake temperature compensation module supply reference ambient temperature signals to the BTMU. The BTMU uses this reference temperature to correct the brake temperature signals from the brake temperature sensors.
A brake temperature compensation module is in the forward electrical junction box on the bottom of each wheel truck.
Training Information Point
The brake temperature sensors are LRUs. The brake temperature compensation modules are also LRUs.
A cover on the forward electrical junction box permits easy access to the brake temperature compensation module.
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BRAKE TEMPERATURE MONITORING SYSTEM -SENSOR AND COMPENSATION MODULE
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BRAKE TEMPERATURE MONITORING SYSTEM -BRAKE TEMPERATURE MONITORING UNIT
Purpose
The brake temperature monitor unit (BTMU) gets the brake temperature signals from the brake temperature sensors (through the brake temperature compensation modules) and supplies this data to the AIMS.
The BTMU also monitors the brake temperature monitoring system for faults.
Location
The BTMU is on the E6-2 shelf in the aft cargo compartment.
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BRAKE TEMPERATURE MONITORING SYSTEM -BRAKE TEMPERATURE MONITORING UNIT
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BRAKE TEMPERATURE MONITORING SYSTEM -FUNCTIONAL DESCRIPTION
General
The left 28v dc bus supplies the electrical power for the brake temperature monitoring system.
Brake Temperature Inputs
The brake temperature sensors in each of the wheel brakes send temperature signals to the brake temperature compensation modules.
The compensation modules supply ambient reference temperature signals.
These inputs go to the brake temperature monitor unit.
BTMU Operation
The BTMU gets the brake temperature input and changes this data to a value between 0.0 and 9.9. This value goes to AIMS for flight deck display.
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