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are not adjustable.
Functional Description
The brake temperature sensors supply analog signals to the
BTMU.
BRAKE TEMPERATURE MONITORING SYSTEM - TEMPERATURE SENSOR
EFFECTIVITY
GUN 201-999 32-46-00
Page 6
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-46-00-003
BRAKE TEMPERATURE MONITORING SYSTEM - TEMPERATURE SENSOR
BRAKE TEMPERATURE MONITORING SYSTEM - TEMPERATURE SENSOR
EFFECTIVITY
GUN 201-999 32-46-00
Page 7
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-46-00-003
Purpose
The brake temperature monitoring unit (BTMU) receives inputs
from the brake temperature sensors and supplies an analog
signal to the two display electronic units (DEUs).
Location
The BTMU is in the E/E compartment.
Physical Description
The BTMU contains two circuit cards, five LEDs and a rotary test
switch, which are used for the built-in test equipment (BITE)
function of the unit.
Functional Description
The BTMU receives analog inputs from the brake temperature
sensors. The signal is converted by the BTMU to a dc voltage
proportional to the brake temperature and supplied to both
DEUs to show on the lower center systems display unit.
Built-in test functions let you do a self-test of the BTMU, and test
the brake sensor circuit.
BRAKE TEMPERATURE MONITORING SYSTEM - BRAKE TEMPERATURE MONITORING UNIT
EFFECTIVITY
GUN 201-999 32-46-00
Page 8
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-46-00-004
BRAKE TEMPERATURE MONITORING SYSTEM - BRAKE TEMPERATURE MONITORING UNIT
BRAKE TEMPERATURE MONITORING SYSTEM - BRAKE TEMPERATURE MONITORING UNIT
EFFECTIVITY
GUN 201-999 32-46-00
Page 9
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-46-00-004
Purpose
Brake temperature for each main landing gear wheel is shown
by a two-digit number, with a range between 0.0 (100F) and 9.9
(1200F). When the brake temperature is more than 5.0, an
amber BRAKE TEMP light comes on.
Location
The brake temperature display is on the lower central display
unit. To see the display, push the SYS display button on the P2
panel.
The amber BRAKE TEMP light is on the P3 panel.
Functional Description
The hottest brake on each main landing gear, if less than 5.0
and equal to or more than 2.0 shows by a solid white normal
brake symbol.
If any brake temperature is more than 5.0, the brake temp
display and the warm brake symbol turn amber. This shows a
hot brake condition. The amber symbol turns off if the brake
temperature decreases to less than 3.5.
An amber BRAKE TEMP light turns on when any brake
temperature is more than 5.0, and turns off when all brake
temperatures decrease to less than 3.5. Brake temperature
equal to or more than 5.0 show that wheel fuse plugs may melt.
BRAKE TEMPERATURE MONITORING SYSTEM - CONTROLS AND INDICATIONS
EFFECTIVITY
GUN 201-999 32-46-00
Page 10
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-46-00-005
BRAKE TEMPERATURE MONITORING SYSTEM - CONTROLS AND INDICATIONS
BRAKE TEMPERATURE MONITORING SYSTEM - CONTROLS AND INDICATIONS
EFFECTIVITY
GUN 201-999 32-46-00
Page 11
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-46-00-005
Purpose
The brake temperature monitoring system monitors the
temperature of each main landing gear brake. Brake
temperature shows on the lower systems display unit. The
brake temperature monitoring system also controls an amber
BRAKE TEMP light when one of the temperature indications is
more than 5.0.
Functional Description
Four brake temperature sensors send signals to the brake
temperature monitoring unit (BTMU). The BTMU processes the
inputs and sends signals to the display electronic units (DEUs).
The DEUs send signals to the lower systems display unit for
temperature indications. The DEUs also control the amber
BRAKE TEMP light.
The amber BRAKE TEMP light comes on when any of the brake
　
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