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Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
AUXILIARY POWER UNIT
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 on-speed 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.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
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.
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
RUNSTART
Initiates the APU prestart BITE.
Activates the flight compartment
displays (oil quantity, speed and RPM).
Starts the fuel pump.
OFF
(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.).
Below 25% RPM the inlet door closes.
Below 5% RPM the EICAS displays and indications are removed.
GF0510_011
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
AUXILIARY POWER UNIT
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.
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