HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
8-5
FOR TRAINING PURPOSES ONLY
APU FIRE EXTINGUISHING
The APU has its own fire extinguisher (Figure
8-5). Discharging of the APU fire bottle is con-
trolled by a guarded switch on the APU con-
trol panel (see Figure 8-6) that fires the
cartridge on the single-shot bottle which is lo-
cated in the rear equipment bay. In addition
to discharging the bottle, the switch also iso-
lates the DC power to the APU fuel solenoid
valve, ensuring APU shutdown.
This bottle has its own red pressure relief indi-
cator disc, located on the exterior of the airplane
under the left engine pylon. If the bottle is dis-
charged due to excessive heat buildup, it will
blow out the red disc, leaving a red indication.
APU FIRE DETECTION
The APU fire detection system comprises three
overheat detector switches, a red FIRE warn-
ing light, and the fire bell.
If an overheat condition is detected by one or
more of the detector switches, a signal is
transmitted to illuminate the FIRE warning in-
dicator, ring the fire bell, and shut down the
APU. The fire bell can be silenced by moving
the master switch to OFF (Figure 8-6), but
the FIRE light remains on until the fire has
been extinguished or the overheat condition
remedied. The momentary TEST button, lo-
cated adjacent to the FIRE light, tests the light
and the bell.
Figure 8-5. APU Extinguisher System
EXTINGUISHER
BOTTLE
PRESSURE-
RELIEF DISC
FUEL PUMP
BOX
APU
FIRE
RESET
SWITCH
Figure 8-6. APU Fire Detection
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