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GEN switch, on the electrical control panel, the green
AVAIL light comes on (a delay of 3 seconds or less between
the RUN light and the AVAIL light coming on is not abnormal).
An APU AVAILABLE white CAS will be displayed.
5. APU GEN Switch — ON.
6. APU BLEED Switch — ON.
7. PACK Switch — On.
APU SHUTDOWN
To shut down the APU:
1. APU START/STOP Switch — Press (momentarily) and release.
An automatic shutdown sequence is initiated. Verify that the
green RUN light goes off and R STBY PUMP white CAS goes
out.
2. APU MASTER Switch (after 30-second delay) — Off.
3. BCN/STROBE Switch — OFF.
4. EMER BATT Switch — OFF.
5. L and R BATT Switches — OFF.
Pilot’s Manual
2-48 PM-126A
APU SHUTDOWN FEATURES (Automatic)
During APU operation, the ECU monitors engine speed, temperature,
oil pressure and electrical surge conditions. The ECU contains circuitry
which will automatically remove power from the APU’s internal fuel
solenoid valve and shut down the APU under the following conditions:
- Overspeed
- Electrical surge in ECU driven circuits
- Low oil pressure
- Over temperature
- Failure of EGT thermocouple
- High oil temperature
APU CIRCUIT BREAKERS
All APU circuit breakers are located on the copilot’s circuit breaker
panel.
CIRCUIT BREAKER SUPPLIES POWER TO
APU CMPTR APU Ammeter,
APU Electronic Control Unit,
APU Fans,
APU FIRE PUSH Control,
APU Fuel Shutoff Valve,
APU Maintenance Control Panel,
APU MASTER Switch,
Generator Reset Control
APU FIRE DET APU Fire Detection Circuit
APU FIRE EXT APU Fire Bottle
APU GEN APU Generator Control Unit
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Bombardier_Learjet-General_Description(27)
