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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
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
05−10−13
APU FIRE PROTECTION
When the APU fire DISCH handle is pulled, the electronic control unit initiates an immediate APU
shut down (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 FIRE PROTECTION Chapter of this manual for information on APU fire protection system.
APU CONTROL PANEL
START
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.
(APU enters a 60 second cooldown period)
RPM decreases to 70% RPM for 60 seconds (below 20,000 ft.)
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.
RUN
Initiates the APU prestart BITE.
On ground, commands the inlet door to full open
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.
GF0510_011
OFF
APU
RUN
OFF START
Accelerates to 100% RPM.
AUXILIARY POWER UNIT
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
05−10−14
START SEQUENCE
The APU requires 28 VDC to start. APU start is automatic, following switch selections of RUN and
START on the APU control panel.
The start sequence is initiated by selecting the APU control switch to RUN:
· APU speed and EGT indicators appear on the EICAS secondary display.
· Activates fuel request signals.
· APU IN BITE (on ground only) status message comes on.
· APU inlet door opens (on ground).
· APU IN BITE (on ground) advisory message goes out (approximately 10 seconds).
Select the APU control switch to START position (spring loaded from START to RUN) for greater
than one second and note the following:
· In flight the inlet door opens and “APU IN BITE” message annunciates.
· At approximately 5% speed, fuel and ignition occur.
· Between 50 and 60% the starter disengages.
NOTE
At 99% RPM plus 2 seconds, the APU is ready to load electrically.
At 99% RPM plus 60 seconds on ground or 2 seconds in flight, the
APU is ready to load pneumatically.
· RPM accelerates to 100%.
NORMAL SHUT DOWN
Select the APU control switch to OFF (the APU enters a cooldown period) and note the following:
· RPM decreases to 70% RPM for 60 seconds or remains at 100% (above 20,000 ft.).
· After 60 seconds fuel is terminated and the RPM will decrease rapidly.
· Below 25% RPM the inlet door closes.
· Below 5% RPM speed and EGT indications are removed from EICAS display.
EMERGENCY SHUT DOWN
The following methods are considered not normal shut down procedures, but may be used in an
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