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The maximum operating altitudeofthe APUis 37,000feet.The maximum altitudeforAPU startingis 30,000feet. The maximum altitudefor main engine starting usingAPUbleedair is 13,000feet. ECSoperation usingAPUbleedair is 15,000feet.
AnElectronic ControlUnit(ECU), locatedin theaftequipment compartment, controls the APUthroughallphases ofoperation. The ECU monitors all sensors andswitches, sets up theappropriatefuelacceleration schedules andrelays specific operatingdatato theengine indication andcrew alertingsystem(EICAS). TheECUis poweredthroughselection of a PWR/FUEL switchlight ontheAPU controlpanelin theflight compartment.
The APUintake doorposition is continuously shown on theEICAS statuspage.APURPM andexhaustgastemperature (EGT)indications are shown on theEICAS statuspage,only whentheAPUPWR/FUEL switchlight ontheAPU controlpanelis selected.
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APUINTAKE
BLEEDAIR DUCT APUENCLOSURE
LOAD
STARTER
GENERATOR
FUEL MODULE COOLER
EXHAUST PIPE ASSEMBLY
COOLING AIR EXHAUST
OIL
MODULE
SERVICE DOOR ENGINEFIRE EXTINGUISHER
SUPPORT CUT-
OFF
ECU
SKID SWITCH
COOLING
AIRINLET
Auxiliary Power Unit Installation
Figure 04---10---1
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APUVALVE
Auxiliary Power Unit Pneumatic FlowFigure 04---10---2
Flight Crew Operating Manual MASTER
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<0039> <0006>
FUELSHUTOFFVALVE APUSTART/STOP SWITCH/LIGHT SWITCH/LIGHT
APU Control Panel
Overhead Panel
CAUTION MESSAGES
Primary Page
APU EGT Indicator and Readout
Indicates exhaust gas temperature in degrees celcius.
APU RPM Indicator and Readout
Indicates percent of APUrpm.
APU Inlet Door Status Indicator
Indicates DOOROPEN or DOORCLOSED DOORMIDPosition.
Auxiliary Power Unit Indication <MST>
Figure 04---10---3
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1. APU POWER PLANT
The APUpowerplant consistsof agasturbine engine andagearbox.
A. Engine
The engine is asingle-shaft, constant speeddesign, consistingof acompressor, a combustorand atwo-stageturbine. The compressor draws large volumes ofair in throughtheinletdoor ontopoftheaftfuselagethendelivers itunderpressure tothe combustor. Fuelfrom bothwingtanks is addedtothehighpressure air andignited, increasingthe energyofthe airflow. Thehigh velocity, hightemperature gasses are deliveredtotheturbine section. The turbine convertsthehigh velocitygasses into mechanical energytodrive the compressor andgearbox. The exhaustgases are ducted overboardthroughthe exhaustpipe on the rightaftfuselage.
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