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mode (airplanes SN 1144 and subsequent and SN 1000 through
1143 with ASC 178 incorporated)
• A warning bell / tone sounds in the nose wheel well if the airplane is
on the ground
The ECU initiates an automatic shutdown sequence that accomplishes the
following:
• The APU shutdown relay is activated and held closed by the Þre
detection circuit
• Fuel is shut off at the ECU
• The air inlet door closes, de-energizing the APU MASTER switch
• Fuel valve closes at the left wing tank
The APU Þre extinguisher must be manually discharged with the switch on
the APU overhead panel. When the switch is pushed, the contents of the
APU Þre bottle are discharged into the APU enclosure. The bottle contains
2½ lbs. of CF3Br pressurized with nitrogen gas. Normal bottle pressure at
70¡F is 600 psi (+50/-25). The bottle is a single use installation - the entire
bottle contents are discharged if the APU FIRE EXT switch is pushed. A
conÞrmation that the bottle has discharged is shown in the legend of the
switch that will illuminate FIRE EXT DSCHD when the bottle is depleted.
A test of the APU Þre detection system is performed prior to starting the
APU. The test is initiated by pressing the APU TEST switch on the FIRE
TEST panel on the cockpit overhead. During the Þre test, all of the
indications listed above will be displayed.
NOTE:
Pushing the APU FIRE TEST switch while the APU is
running will shut down the APU.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-49-00
Page 7
October 11/02
Revision 8
2A-49-30: APU Controls and Indications
1. Cockpit APU Controls and Indications:
Controls and indications for the APU are installed on Þve panels in the cockpit.
Illustrations of the panels are shown in Figure 2 and in sections 2A-24-00,
2A-26-00 and 2A-36-00 of this manual.
A. APU Panel:
The APU panel has the following controls and indications:
• APU MASTER - alternate action switch illuminates ON in white
when selected to connect battery power to the APU for starting and
open APU air inlet. When the air inlet is fully open, a limit switch
Auxiliary Power Unit
Figure 1
OPERATING MANUAL
2A-49-00 PRODUCTION AIRCRAFT SYSTEMS
Page 8
October 11/02
Revision 8
routes power to the ECU, opens the fuel shutoff valve in the left wing
tank, arms the APU START switch and overspeed switch, and
illuminates of the red OIL PRESS LOW light signalling that the APU
is ready to start. On airplanes SN 1096 and subsequent, and SN
1041-1095 having ASC 119, aborting an APU start prior to 60%
RPM by selecting the APU MASTER switch off will disengage the
APU starter. On all other airplanes, the OVSP TEST - STOP switch
must be used to disengage the starter if a start is discontinued prior
to the APU reaching 60% RPM.
• START - momentary action switch illuminates ON in white when
power is applied to the APU starter initiating the start sequence
controlled by the ECU. The start may by monitored by observing the
EGT and RPM readouts on the APU panel. For airplanes not having
ASCs 13, 212 and 212 AM1, the ON indication only monitors the
APU start relay. For airplanes SN 1000-1155 having ASCs 13 and
212 and SN 1156 and subsequent having ASC 212 AM1, the ON
light monitors actual DC power application to the APU starter. The
ON light should extinguish at 60% RPM, normal starter cutout
speed.
• OVSP TEST-STOP - momentary action switch illuminates TEST in
white when selected. Pushing switch sends an overspeed signal of
114% RPM to the ECU, prompting the ECU to shut down the APU.
Automatic overspeed shutdown is commanded by the ECU at 110%
RPM. This switch is the normal means of shutting down the APU.
• APU FIRE EXT - guarded single action switch illuminates amber text
FIRE EXT DISCHD after APU Þre bottle has been used
• APU FIRE - light capsule illuminates APU FIRE in red if a Þre is
detected in the APU enclosure. ECU automatically shuts down the
APU.
• OIL TEMP HIGH - light capsule illuminates OIL TEMP HIGH in red
and ECU automatically shuts down the APU if oil temperature
exceeds 141¡- 147¡C. APU MASTER switch must be on for the
warning to be armed.
• OIL PRESS LOW - light capsule illuminates OIL PRESS LOW in red
when APU air inlet door is fully open and APU is ready for start.
When APU is operating (RPM above 95%) the light will illuminate
and the ECU automatically shuts down the APU if oil pressure falls
below 31 psi for longer than 10 (±2) seconds. APU MASTER switch
　
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