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The manual OFF
position will command the LCV to close as selected.
APU Shutdown
When the “OFF” position on the APU control panel is selected, the FADEC controls the shut down
sequence. The readytoload
signals are cancelled, commanding the APU load valve closed and
reducing the APU speed to 70% (below 20,000 feet) or 100% (above 20,000 feet) for a 60 second
cooldown period.
NOTE
If the APU switch is selected to RUN prior to completion of the
60 second cooldown period, the APU returns to 100% and continues
normal operation.
After cooldown is completed, the APU FADEC shuts down the APU and all loads and fuel
demands are cancelled. When the speed drops below 25%, the inlet door is closed, APU
operating hours and fault information are stored in the FADEC and the APU indications are
removed from EICAS.
If the BATT MASTER switch is selected OFF, fire handle is pulled, or either APU shutoff switches
(External Services Panel or APU compartment) is selected, the APU FADEC will cancel the
cooldown period and initiate an immediate shut down.
AUXILIARY POWER UNIT
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
05−10−13
APU DOOR OPERATION AND INDICATION
The APU door operation and EICAS indication displays are as follows:
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 when the APU control switch is selected to RUN. The door will
be commanded to 100% open for start and onspeed
condition for ground operation. In flight prior
to start, the inlet door will be positioned to either 10 degrees open at 0.85 MACH or 20 degrees
open at 0.40 MACH. The door remains in either position until the APU reaches 20% speed and
then will begin to gradually open until the door has reached the full open position and remains
there.
The inlet door will be commanded to the closed position by the FADEC when the speed drops
below 25% on shut down.
Door Indication
The APU door position is displayed on the EICAS STAT page. It is only indicated when there is a
door fault and appears in conjunction with the APU DOOR FAIL caution message. The numerical
readout is amber when a door fault exists as sensed by the FADEC.
GF0510_008
APU RPM
Indication
Indicates that RUN
position is selected on
the APU control panel.
APU DOOR
Indication
APU EGT
Indication
Indicates that RUN
position is selected on
the APU control panel.
Indicates that a door
failed open condition
exists.
APU DOOR
CKPT (°C) FWD
CABIN (°C)
AFT
CABIN (°C)
20
90
22
20
22
20
300
0.00
000
OXYGEN 000
CAB ALT
P
CAB RATE
LDG ELEV
19
%
OIL QTY (QTS)
ENG
APU
RES
10.4
4.5
5.0
10.4
APU
RPM 100 EGT 430
BRAKE TEMP
03 03 03 03
APU DOOR 13.2°
APU RPM and EGT Indications
For normal operations, the two APU parameters (RPM, EGT and corresponding numerical values)
are displayed on the status page when the RUN position is selected on the APU control panel. The
display remains active until APU speed drops below approximately 5% and the APU door is closed
with the APU switch selected to OFF. The numerical readouts change to red when their limit
values (refer to FCOM CSP 7006
VOL 1, Chapter 2 LIMITATIONS) are exceeded.
AUXILIARY POWER UNIT
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
05−10−14
APU FIRE PROTECTION
When the APU fire DISCH handle is pulled, the electronic control unit initiates an immediate APU
shutdown (with no cooldown period) and sends a signal to display the APU SHUTDOWN advisory
message. When the APU fire handle has been pulled, then turned, the fire extinguishing bottle is
discharged. If necessary, a second fire extinguishing bottle can be discharged (fire handle pulled) by
displacing the fire handle unlock pin and turning the fire handle in the opposite direction.
GF0510_009
APU DISCH
HANDLE
APU BOTTLE
SELECT
UNLOCK PIN
DISCH
PULL
1 2
DISCH
PULL
1 2
DISCH
PULL
1 2
WARNING
The APU must not be left unattended during ground operations.
Although there are protective shutdown features for the APU, 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
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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