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• In flight, commands the inlet door to open to either
10° (0.85 MACH) or 20° (0.40 MACH)
• Activates the flight compartment displays (oil quantity,
speed and RPM).
• Starts the fuel pump.
OFF (APU enters a 60 second unloaded, i.e. bleed and AC loads removed, cooldown period).
• RPM decreases to 70% RPM for 60 seconds (below 20,000 ft.) or remains at 100% above
(20,000 ft.).
• After 60 seconds the RPM will continue to decrease and fuel will stop at this time.
• Below 25% RPM the inlet door closes.
• Below 5% RPM the EICAS displays and indications are removed.
START
• Spring-loaded to RUN
• Fuel and ignition on at 5%.
• Starter disengage at approximately
50% RPM.
• Ground - ignition off at 50% RPM.
• In-flight - ignition off at 98% RPM.
• Accelerates at 100% RPM.
GX_04_007
For Training Purposes Only
Sept 04
4-15
P I LOT T R A I N I N G GU I D E
AUXILIARY POWER UNIT
NOTE
At 99% rpm plus 2 seconds, the APU is ready to load electrically.
At 99% rpm plus 60 seconds on ground, the APU is ready to load
pneumatically, if the prestart EGT < 149°C. At 99% rpm plus 2
seconds on ground, the APU is ready to load pneumatically, if
the prestart EGT ≥ 149°C. At 99% rpm plus 2 seconds in flight,
the APU is ready to load pneumatically.
APU DOOR POSITIONING
The APU door is positioned as a function of WOW, Mach number, and APU speed.
When RUN is selected on the APU control panel and the airplane is on ground, the
APU door is commanded to the full open position (47°).
DOOR OPERATION
The APU inlet door is located on the upper right fuselage area. It is electrically
actuated and is scheduled opened by the FADEC. The door will be commanded to full
open for start and on-speed condition for ground operation. In flight prior to start, the
inlet door will be positioned according to Mach number until the APU reaches 20%
speed and then will begin to gradually open until the door has reached the full open
position.
The inlet door will be commanded to the closed position by the FADEC when the
speed drops below 25% on shut down.
A fully opened door will cause profile drag and affect performance (refer to AFM
Chapter 6, PERFORMANCE).
EICAS DISPLAY
DOOR INDICATION
The APU door position is normally NOT displayed on the EICAS STAT page. It is
only indicated when there is a door fault and will appear in conjunction with an
APU DOOR FAIL caution message. When a door fault is sensed by the FADEC an
amber numerical readout in degrees will be displayed.
4-16 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
AUXILIARY POWER UNIT
APU FIRE PROTECTION
When the APU DISCH fire handle is pulled, the FADEC initiates an immediate APU
shut down (with no cooldown period) and sends a signal to display the APU
SHUTDOWN advisory message. When the pulled APU fire handle is then turned, the
first fire extinguishing bottle is discharged. If necessary, the second fire bottle can be
discharged by displacing the APU bottle unlock pin, and turning the fire handle in the
opposite direction (this is a two-handed operation).
Honeywell
APU DOOR
RPM EGT
BRAKE TEMP
90%
100 650
03 03 03 03
OIL QTY (QTS)
ENG
APU
RES
12 . 3 12.3
5.0
3.2
13.2
CKPT (C) FWD
CABIN (C)
AFT
CABIN (C)
OXYGEN
CAB RATE
LDG ELEV
P
1300
20
19
22
20
22
20
0.00
0
1000
CAB ALT
APU DOOR
APU RPM
INDICATION
Indicates that RUN
position is selected on
the APU control panel.
APU DOOR
INDICATION
Indicates that a door
fault exists.
APU EGT
INDICATION
Indicates that RUN
position is selected on
the APU control panel.
GX_04_008
DISCH
PULL
1 2
L PULL
A
P
U
DISCH
1 2
DISCH
1 2
RPULL
GX_04_009
Disch Handle
APU Bottle
Unlock Pin
For Training Purposes Only
Sept 04
4-17
P I LOT T R A I N I N G GU I D E
AUXILIARY POWER UNIT
Although there are protective shutdown features for the APU (see “Protective
Shutdowns” on page 6-20), there is no automatic discharging of the fire agent in the
event of a fire. The APU must not be left unattended for ground operation. Refer to
FIRE PROTECTION chapter 9 in this manual for information on APU fire protection
system.
WARNING
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