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15,000
20,000
25,000
30,000
35,000
40,000
45,000
(--1,000 feet)
APU Generator Loading
Limit (41,000)
APU Altitude Starting
Limit (37,000)
APU MES and ECS Bleed
Altitude Limit (25,000)
Surge Valve Closed
Below 17,000 FT
Ground Starting
Altitude Limit
(15,000)
PRESSURE ALTITUDE, FEET
STATIC AIR TEMPERATURE, CELSIUS
Vol. 1 04--10--6
AUXILIARY POWER UNIT
Introduction REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
APU Door Position
Figure 04---10---5
0
0
DOOR POSITION SCH. (Degrees)
10
20
30
40
50
60
20 40 60 80 100
ARINC MACH NO = 0.4
ARINC MACH NO = 0.85
N (% speed) ARINC MACH NO = 0.4
DOOR POSITION SCH.
(Degrees)
0
10
30
50
70
95
100
9.0
9.0
45.0
45.0
45.0
45.0
45.0
ARINC MACH NO = 0.85
DOOR POSITION SCH
(Degrees)
4.5
4.5
9.0
45.0
45.0
45.0
45.0
APU DOOR POSITION SCHEDULE
N (% speed)
Vol. 1 04--10--7
AUXILIARY POWER UNIT
Introduction REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
EGT Shutdown Schedule
Figure 04---10---6
NOTE
EGT acceleration shutdown limit
increases with higher altitudes.
NOTE
EGT ECS & MES shutdown limits increase with
higher inlet temperatures and higher altitudes.
Vol. 1 04--10--8
AUXILIARY POWER UNIT
Introduction REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 04--20--1
AUXILIARY POWER UNIT
Power Plant Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
1. APU POWER PLANT
The APU power plant consists of a gas turbine engine and 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
through the inlet ducting and delivers it under pressure to the combustor. Fuel from the
left collector tank 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.
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.
Vol. 1 04--20--2
AUXILIARY POWER UNIT
Power Plant Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 04--30--1
AUXILIARY POWER UNIT
Systems REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
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, oil temperature sensor and a deprime solenoid. The
lube module provides pressurized oil to the power plant, gearbox and generator for
lubrication and heat removal. To ease starting under cold conditions, a de-prime
solenoid allows vent air to enter the lube pump to reduce starter motor drag.
B. Fuel
Fuel is supplied to a fuel control unit from the left collector tank by a dedicated APU fuel
pump (refer to Chapter 13). 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
used to ignite the fuel/air mixture in the combustor which further accelerates the power
plant. As the APU accelerates toward 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 sustaining.
D. Air Intake and Exhaust
The air inlet door is located in the upper right side of the rear fuselage and is controlled
by the ECU. When open, the door provides ram air for APU operation and oil cooling.
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