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APU engine speed shows on the control display unit (CDU) input
monitoring.
APU CONTROLS - SPEED SENSOR
EFFECTIVITY
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APU CONTROLS - SPEED SENSOR
APU CONTROLS - SPEED SENSOR
EFFECTIVITY
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Inlet Temperature Sensor
The inlet temperature sensor supplies inlet air temperature
data (T2). The ECU uses this data for these functions:
* Fuel control
* IGV control
* SCV control
* EGT trim schedule (ECS and MES modes)
* Inlet overheat.
Location
The inlet temperature sensor is on the bottom of the APU
compressor plenum.
Functional Description
The inlet temperature sensor is a resistive temperature device
(RTD). When the air temperature into the inlet of the compressor
changes, the resistance changes in the sensor. The ECU
senses this change in resistance. The ECU adjusts the APU
operation due to that temperature change.
The ECU also sends the temperature to the control display unit
(CDU) in the flight compartment.
APU CONTROLS - INLET TEMPERATURE SENSOR T2
EFFECTIVITY
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APU CONTROLS - INLET TEMPERATURE SENSOR T2
APU CONTROLS - INLET TEMPERATURE SENSOR T2
EFFECTIVITY
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Purpose
The APU exhaust gas temperature indicating system supplies
APU exhaust gas temperature data for flight compartment
indication and APU control.
Location
Two chromel/alumel thermocouples are on the bottom of the
exhaust section. Each thermocouple has two temperature
sensing junctions. The thermocouples are close together, but
the tips in the exhaust stream are 60 degrees apart.
Functional Description
The ECU receives temperature inputs from the two
thermocouples. The ECU uses the highest temperature) for
indication and control.
Indication
The APU EGT is on the EGT indicator on the P5 panel and on the
CDU.
Training Information Point
Loss of input from one thermocouple does not cause the loss of
EGT indication. Loss of EGT input from both thermocouples
causes loss of indication. EGT overtemperature or loss of EGT
from both thermocouples cause an APU protective shutdown.
APU INDICATING SYSTEM - EGT INDICATION
EFFECTIVITY
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APU INDICATING SYSTEM - EGT INDICATION
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Purpose
The data memory module (DMM) keeps this APU data in nonvolatile
memory:
* APU health data
* APU operating hours
* APU serial number
* APU turbine life used
* Number of APU starts
* Shutdown data
* Start data.
The DMM keeps this APU data so that APU engine data stays
with the APU engine.
General Description
The ECU controls the data that goes in the DMM. The ECU reads
the DMM memory during the APU start sequence and gives
updated information to the DMM during APU shutdown. The
control display unit (CDU) shows APU parameters that are in
the DMM.
Location
The DMM is on the left side of the APU.
Training Information Point
You read DMM data with special test equipment or with the
CDU.
Replacement of the ECU does not cause loss of the data that is
in the DMM.
Do not remove the data memory module at the same time you
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