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Vol. 1 04--10--4
AUXILIARY POWER UNIT
Introduction
Flight Crew Operating Manual MASTER
CSP A--013
Auxiliary Power Unit Indication <MST>
Figure 04---10---3
<0039>
Status Page
Primary Page
CAUTION
MESSAGES
APU RPM Indicator
and Readout
Indicates percent of
APU rpm.
APU EGT Indicator
and Readout
Indicates exhaust gas
temperature in degrees
celcius.
APU Inlet Door
Status Indicator
Indicates DOOR OPEN
or DOOR CLOSED or
DOOR MID Position.
<0039>
<0039>
FUEL SHUTOFF VALVE
SWITCH/LIGHT
APU START/STOP
SWITCH/LIGHT
<0006>
APU Control Panel
Overhead Panel
Vol. 1 04--20--1
REV 56, Jan 31/03
AUXILIARY POWER UNIT
Power Plant
Flight Crew Operating Manual
CSP A--013
MASTER
1. APU POWER PLANT
The APU power plant consists of a gas turbine engine and a gearbox.
A. Engine
The engine is a single-shaft, constant speed design, consisting of a compressor, a
combustor and a two-stage turbine. The compressor draws large volumes of air in
through the inlet door on top of the aft fuselage then delivers it under pressure to the
combustor. Fuel from both wing tanks is added to the high pressure air and ignited,
increasing the energy of the airflow. The high velocity, high temperature gasses are
delivered to the turbine section. The turbine converts the high velocity gasses into
mechanical energy to drive the compressor and gearbox. The exhaust gases are
ducted overboard through the exhaust pipe on the right aft fuselage.
B. Gearbox
The gearbox reduces the turbine shaft rpm to a speed suitable to operate the gearbox
mounted accessories. Accessories include the lubrication module, fuel control unit,
electric starter and generator. The gearbox has an integral oil sump. The oil level can
be checked using a sight glass on the oil filler assembly.
REV 56, Jan 31/03
Vol. 1 04--20--2
AUXILIARY POWER UNIT
Power Plant
Flight Crew Operating Manual MASTER
CSP A--013
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 04--30--1
REV 56, Jan 31/03
AUXILIARY POWER UNIT
Systems
Flight Crew Operating Manual
CSP A--013
MASTER
1. SYSTEMS
The APU consists of a lubrication system, fuel system, ignition and starting systems, and an
air intake and exhaust.
A. Lubrication
The lubricating system consists of a mechanically driven lubrication module, oil filter, oil
cooler, low oil pressure switch, and an oil temperature sensor. The lube module
provides pressurized oil to the power plant, gearbox and generator for lubrication and
heat removal.
B. Fuel
Fuel is supplied to the APU fuel control unit from the left and right wing tanks by the
XFLOW/APU pump (refer to Chapter 13). The fuel shutoff valve is opened by the ECU
at 10% speed. The fuel control unit starts, stops and modulates the flow of fuel to the
APU in response to commands from the ECU.
C. Ignition and Starting
The ignition and starter systems are controlled by the ECU. The ECU commands the
DC starter motor to rotate the power plant. The starter accelerates the power plant to a
specific speed where the ECU introduces fuel to the combustor. The ignition system is
provided to ignite the fuel/air mixture in the combustor which further accelerates the
power plant. As the APU accelerates towards the onspeed condition, the starter is
disengaged. When the APU reaches normal operating speed the ignition is turned off.
At this point the engine becomes self sufficient.
D. Air Intake
The air inlet door is located in the upper rear fuselage. An actuator, controlled by the
ECU positions the door. When open, the door provides ram air for APU operation and
the oil cooling. On the ground, the air inlet door has only two positions, open and
closed (0 and 42_). In flight, during APU start above 13,000 feet, the ECU limits the
door position in response to APU engine rpm and aircraft speed. This prevents
excessive amounts of ram air which could cause the APU to flameout. For APU start
below 13,000 feet, the door is fully open.
When the APU is not operating, the door remains closed to prevent windmilling of the
compressor. The inlet door also serves as a barrier in the event of fire.
REV 56, Jan 31/03
Vol. 1 04--30--2
AUXILIARY POWER UNIT
Systems
Flight Crew Operating Manual MASTER
CSP A--013
Auxiliary Power Unit Controls and ECU Interface
Figure 04---30---1
PWR
FUEL
START/
STOP
APU
L
ENG
R
ENG
APU
　
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