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made at the ELEC PWR location on the overhead panel. Aircraft that incorporate
Canadair Service Bulletin 600-0435 have an auxiliary 28-volt dc battery in the
nose avionics compartment. Use of the auxiliary battery for cold weather
starts prevents automatic start shutdown which would otherwise occur if the APU
electronic control unit detected a large voltage drop on the battery bus.
Auxiliary battery power is selected on the AUXILIARY BATTERY panel and is made
available to the APU electronic control unit when the FUEL ON/OFF switch/light
is pressed in during the start sequence (refer to Figure 3).
Before starting the APU, the external APU fault panel should be clear of all
warnings and the BLEED AIR switch/light on the APU control panel pressed out.
The start cycle is initiated by pressing in the FUEL ON/OFF switch/light,
followed by the START/STOP switch/light on the APU control panel. The FUEL
ON/OFF switch/light energizes the APU fuel pump and completes an electrical
power supply circuit to the START/STOP switch/light. On aircraft with an
auxiliary battery installed, the engine-mounted fuel shutoff valve opens when
the FUEL ON/OFF switch/light is pressed in. When the START/STOP switch/light
is pressed in, both of the shutoff valves in the APU fuel feed system open
(refer to Section 12), the APU starter motor is energized and the STARTER
legend on the switch/light comes on. At 10% rpm, the engine-mounted fuel
solenoid shutoff valve opens on aircraft without the auxiliary battery
installation and the ignition system is energized. At 60% rpm, the STARTER
light goes out, indicating that the starter has disengaged. At 95% rpm,
ignition is de-energized and a green APU READY light on the START/STOP
switch/light comes on. The engine then accelerates to 100% rpm. Normally, the
engine accelerates to running rpm in not more than 60 seconds.
SECTION 5
Page 3
Mar 01/85
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OPERATING MANUAL
PSP 606
BLEED AIR SWITCH/LIGHT
When pressed in, green OPEN light comes on,
load control valve opens and APU air is available
for aircraft systems.
When pressed out, load control valve
closes and OPEN light goes out.
Amber FAILED light comes on if load
control valve fails to respond to
switch light commands or if engine
bleed air is selected and load control
valve fails to close.
When pressed in, fuel booster pump is
energized and power is connected to
START/STOP switch/light.
Amber PUMP INOP light comes on when
switch/light is pressed and fuel booster pump
fails.
When pressed out, fuel booster pump is deenergized
and power is removed from
START/STOP switch/light.
If the APU FIRE PUSH switch/light is pressed
after a fire warning, the fuel shutoff valve
closes and diverts fuel back to the tank. The
white SOV CLOSED light comes on.
START/STOP SWITCH/LIGHT
When pressed in, both APU fuel feed system
shutoff valves open, starter motor is energized
and amber STARTER light comes on. At 60%
rpm, amber STARTER light goes out. At 95%
rpm and 4 ± 1 seconds later, green APU
READY light comes on.
When pressed out, APU READY light goes out,
fuel valves close and APU shuts down.
ADPTR OIL FAULT LIGHTS
Amber HI TEMP light comes on to indicate generator
adapter high oil temperature. APU shuts down
automatically.
Amber LO PRESS light comes on to indicate
generator adapter low oil pressure. APU shuts down
automatically.
ENGINE SPEED
INDICATOR
APU OIL FAULT LIGHTS
Amber HI TEMP light comes on to indicate APU high
oil temperature. APU shuts down automatically.
Amber LO PRESS light comes on to indicate APU
low pressure. APU shuts down automatically.
APU Controls and Indicators SECTION5
Figure 2 Page 4
Oun 12/86
canatiair
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OPERATING MANUAL
PSP 606
|4. SHUTDOWN (Figures 2 and 4)
Normal shutdown of the APU is accomplished by removing all loads from the unit,
then pressing out the START/STOP switch/light on the APU CONTROL panel. When
| the APU has completely stopped, pressing out the FUEL ON/OFF switch/light
de-energizes the APU fuel pump and disconnects the electrical power supply
circuit to the START/STOP switch/light.
Remote APU shutdown is accomplished by pressing the APU STOP pushbutton on the
external APU FAULT panel* After a remote shutdown, the START/STOP switch/light
must be pressed out to reset the APU starting system.
| The APU electronic control unit shuts down the APU automatically for any of the
following reasons:
APU overspeed
Overcurrent
High exhaust gas temperature
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