BRAKE TEMPERATURE MONITORING SYSTEM -FUNCTIONAL DESCRIPTION
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BRAKE TEMPERATURE MONITORING SYSTEM -INDICATION
General
Brake temperature indication shows on the landing gear synoptic display and the brake and steering maintenance page.
Brake Temperature Indication
Brake temperature between approximately 38C (100F) and 1038C (1900F)shows as a number on a linear scale between 0.0 and 9.9.
On the landing gear synoptic display, the values less than 5.0 show in white. A solid white brake symbol shows the hottest brake on each main gear truck between 3.0 and 4.9. If two brakes on one truck are the same temperature, the solid white brake symbol shows the brake that first went to that temperature.
When the brake temperature is 5.0 or more, the number changes to amber and the brake symbol changes to a solid
amber. All brake temperatures above 5.0 will show this
indication. The amber indication stays on until the brake
temperature decreases to less than 3.5.
A BRAKE TEMP message shows on the EICAS display if there is an amber temperature indication.
Training Information Point
If the brake temperatures are more than 5.0, the wheel thermal fuse plugs may melt.
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BRAKE TEMPERATURE MONITORING SYSTEM -INDICATION
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777 AIRCRAFT MAINTENANCE MANUAL
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TIRE PRESSURE INDICATION SYSTEM -INTRODUCTION
Purpose
The tire pressure indication system measures the tire pressures for the two nose gear and 12 main gear tires.
Components
These are the tire pressure indicating system components:
*
Tire pressure sensor (14)
*
Wheel interface unit (WIU) (14)
*
Tire pressure monitor unit (TPMU).
General Description
The TPMU sends tire pressure data to AIMS through the left ARINC 629 bus.
The MFD shows tire pressure data on the landing gear synoptic display and brake and steering maintenance page.
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TIRE PRESSURE INDICATION SYSTEM -INTRODUCTION
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TIRE PRESSURE INDICATION SYSTEM -TIRE PRESSURE SENSORS AND WHEEL INTERFACE UNITS
Location
A tire pressure sensor is on each tire. There is one wheel interface unit for each wheel in the axles.
Tire Pressure Sensor
The tire pressure sensor is a strain gauge device that changes tire pressure to a dc voltage.
The tire pressure sensors attach to a sensor holder on the wheel.
A sensor wire connects the tire pressure sensor to the WIU.
Wheel Interface Unit
The WIU is a rotating transformer. It sends the tire pressure signal across the rotating interface of the wheel by inductance.
The WIUs change the output from the tire pressure sensors to a frequency that is in proportion to the tire pressure.
Training Information Point
To remove a tire pressure sensor, you do not need to deflate the tire. However, if the sensor is not installed, air will leak out of a fully inflated tire at approximately four psi per minute. You can install a cap to stop the leakage.
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TIRE PRESSURE INDICATION SYSTEM -TIRE PRESSURE SENSORS AND WHEEL INTERFACE UNITS
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TIRE PRESSURE INDICATION SYSTEM -TIRE PRESSURE MONITOR UNIT
Purpose
The TPMU supplies power to the WIUs and the tire pressure sensors. It gets the tire pressure inputs and sends this data to the AIMS.
The TPMU also monitors the tire pressure indication system components for faults.
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