APU INDICATING SYSTEM -EGT INDICATING SYSTEM
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APU INDICATING SYSTEM -DATA MEMORY MODULE
Purpose
The data memory module(DMM) keeps this APU data in non-volatile memory:
*
APU serial number
*
APU operating hours
*
Number of APU starts
*
Start data
*
Shutdown data
*
Pneumatic system operating mode
*
APU turbine life used.
*
APU health data.
The DMM keeps this APU data so that APUC replacement will not cause loss of APU operation data.
General Description
The APUC controls the data flow into the DMM. The APUC reads the DMM memory during the APU start sequence and transmits updated information to the DMM during APU shutdown.
Location
The DMM is on the left side of the APU.
Training Information Point
You can read DMM data with special test equipment.
Replacement of the APUC does not cause the loss of the data stored in the DMM.
CAUTION: DO NOT REMOVE THE APUC AND THE DATA MEMORY MODULE AT THE SAME TIME. IF YOU REMOVE THE APUC AND THE DATA MEMORY MODULE AT THE SAME TIME, YOU WILL LOSE THE DATA FOR THE APU.
If you replace the DMM, make sure you obey the precaution given below.
CAUTION: YOU MUST USE A BLANK DATA MEMORY MODULE. IF YOU DO NOT USE A BLANK DATA MEMORY MODULE, LOSS OF DATA OR INCORRECT DATA CAN OCCUR.
If you replace both the APUC and the DMM, make sure you obey the precaution given below.
CAUTION: YOU MUST DO THE APU CONTROLLER INSTALLATION TEST BEFORE YOU REMOVE THE DATA MEMORY MODULE. IF YOU DO NOT DO THE INSTALLATION TEST FOR THE APU CONTROLLER BEFORE YOU REMOVE THE DATA MEMORY MODULE, YOU WILL LOSE THE DATA FOR THE APU.
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APU INDICATING SYSTEM -DATA MEMORY MODULE
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777 AIRCRAFT MAINTENANCE MANUAL
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49-80-00
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
APU EXHAUST SYSTEM
Purpose
The APU exhaust system sends the APU exhaust overboard through the exhaust duct. The exhaust system prevents APU compartment damage from high exhaust gas temperatures and decreases exhaust noise levels.
Components
The stainless steel APU exhaust duct attaches to the APU turbine section with a V-Band clamp. A spring-leaf seal assembly holds the exit end of the exhaust duct in the exhaust duct panel. The 13 degree exhaust duct angle sends the exhaust out the left side of the aircraft.
An insulation blanket goes around the exhaust duct. Safety wire lacings hold the blanket together.
A muffler and acoustic assemblies in the exhaust duct decrease exhaust noise.
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777 AIRCRAFT MAINTENANCE MANUAL
APU EXHAUST SYSTEM
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APU OIL INDICATING SYSTEM -INTRODUCTION
Purpose
The APU oil indicating system supplies APU oil temperature, pressure, and quantity data for APU flight deck display and APU control functions.
Components
These are the oil indicating system components:
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Oil pressure sensor
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Low oil pressure switch
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Oil temperature sensor
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Oil quantity/sump temperature sensor.
An oil level sight gage on the gearbox shows oil level.
Location
The oil pressure sensor, the low oil pressure switch, and the oil temperature sensor are on the lube cluster. The oil quantity/ sump temperature sensor and the oil level sight gage are on the APU gearbox.
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