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illuminate, the APU fire warning horn sounds and the
APU shuts down.
- Ten seconds after illumination of the APU FIRE PUSH
annunciator, the fire bottle will release a charge of Halon
into the APU compartment.
- The fire extinguisher may also be activated manually by
depressing the APU FIRE switch.
The following CAS illuminations are specific to the APU fire warning
system:
APU BLEED AIR
Refer to Section VI, ANTI-ICE & ENVIRONMENTAL, for information
on APU bleed air.
APU GENERATOR
Refer to Section IV, ELECTRICAL & LIGHTING, for information on the
APU generator.
CAS Color Description
APU FIRE Red A fire has been detected in the APU
compartment.
Pilot’s Manual
PM-126A 2-45
OPERATING PROCEDURES
APU PRE-START CHECK
This check should be accomplished if the APU is to be started without
accomplishing the standard aircraft preflight.
The APU maintenance panel is located in the tailcone.
Access is gained through the tailcone access
door.
1. L and R BATT Switches — On, simultaneously.
2. EMER BATT Switch — EMER.
3. APU MASTER Switch — ON.
4. Tailcone Interior Check:
a. OIL TEST Switch (on the APU maintenance panel) —
Select. If the LOW indicator comes on, have oil serviced
prior to starting the APU.
b. APU FAN FAIL indicator (in the tailcone) — Check. If indicator
shows amber, obtain maintenance as required prior to
running APU (temperatures above 100° F [38° C]).
APU may be operated at ambient temperatures up to
100° F (38° C) with an amber APU FAN FAIL indication.
c. APU Fire Bottle Pressure — Check.
5. APU Exhaust — Clear of obstructions.
6. APU Inlet — Clear of obstructions.
7. Check APU firebox drains for indications of oil or fuel leaks.
8. Fuel Quantity (right wing) — Check.
9. PACK Circuit Breaker (pilot’s ENVIRONMENTAL group) —
Set.
10. APU Circuit Breakers (copilot’s APU group) — Set.
11. L and R BLEED Circuit Breakers (pilot’s and copilot’s ENVIRONMENTAL
and ENVIR group) — Set.
12. MAN and AUTO Circuit Breakers (copilot’s ENVIR group
[TEMP CTRL]) — Set.
13. L and R BLEED Switches — OFF.
14. PACK Switch — OFF.
15. HI FLOW Switch — Off.
16. MANUAL TEMP Switch — Off.
17. COCKPIT and CABIN TEMPERATURE COLD-HOT Knobs —
Rotate to the mid (12 o’clock) position.
NOTE
NOTE
Pilot’s Manual
2-46 PM-126A
APU START UP
To start the APU:
1. L INSTR Lights Switch — On.
2. BCN/STROBE Switch — BCN.
3. APU Fire Detection System — Test:
Ensure personnel are clear of the nose wheel well/
avionics bay area during the APU fire warning system
test. The APU fire warning horn is located in this
area.
a. SYSTEM TEST Switch — Rotate to FIRE DET. Press and
hold.
b. Verify:
- The APU FIRE red CAS activates.
- The Master WARN tone and lights activate.
- The APU FIRE switch/indicator illuminates.
- After 13 to 18 seconds the APU fire warning horn will
sound.
c. SYSTEM TEST Switch — Release.
4. APU START/STOP Switch — Press (momentarily) and release.
An automatic start sequence is initiated and the following
events will occur:
- The white START light will illuminate.
- The APU engine start relay receives 28-vdc power from
both aircraft batteries.
- The APU fuel shutoff valve opens. The right fuel standby
pump begins operation (an R STBY PUMP ON white CAS
is displayed and ON will illuminate on the R STBY PUMP
switch/indicator).
- As the starter is energized, it provides a rotational input to
the gear train. The gear train drives the compressor and
turbine components, the oil pump and the fuel control unit.
- When the engine reaches the specified RPM, the ECU permits
fuel flow to the fuel nozzle assemblies, and the ignition
unit causes the igniter plug to fire and ignite the fuelair
mixture in the combustion chamber.
- The starter assists acceleration up to the starter cutout
speed.
CAUTION
Pilot’s Manual
PM-126A 2-47
- At approximately 60% RPM, compressor discharge pressure
opens the surge control valve, dumping a small percentage
of compressor discharge air overboard preventing
engine surge.
- As acceleration continues and engine speed reaches
approximately 95% RPM plus 4 seconds, the ECU deactivates
ignition.
- On the START/STOP switch/indicator, the START light
goes off and the green RUN light comes on. On the APU
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