HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
FIRE DETECTION
ENGINE FIRE/OVERHEAT
Fire or overheat in each engine is detected by
two fire/overheat responders connected to a
continuous-wire sensor element (Figure 8-1).
The sensor element is a sealed tube contain-
ing gas. The gas expands as the temperature
increases, and, at a predetermined temperature,
the expanding gas initiates visual and audible
warnings in the cockpit. As cooling occurs, the
contraction of the gas in the element cancels
the warnings.
The detector system in each engine sends a sig-
nal to its associated ENG 1 or 2 FIRE annun-
ciator on the FIRE panel and to the respective
repeater annunciators located on the MWS
panel. Also illuminated by an engine fire/over-
heat detection signal are the red MWS flash-
ing annunciators and the respective HP cock
warning light.
The fire detection signal also operates the fire
warning bell. Bell operation can be silenced
by depressing the appropriate BELL CAN-
CEL switchlight which then illuminates BELL
CNCLD in white letters. These annunciators
are located on the FIRE panel which is part of
the roof panel (see Figure 8-1).
Each detector circuit has a TEST button, also
located on the roof panel. Pressing either TEST
switch illuminates the appropriate ENG FIRE
annunciator on the FIRE panel and the re-
spective ENG FIRE repeater on the MWS
panel, causes both red MWS annunciators to
flash, lights the associated HP cock warning
light, and rings the fire warning bell.
The fire detection system in each engine will
not test unless both fire detector elements, in
the engine being tested, have the proper pres-
sure levels.
A l l a n n u n c i a t o r s a r e s h o w n i n t h e
Annunciator Chapter.
REAR EQUIPMENT BAY
OVERHEAT
Six thermal switches are located in the rear
equipment bay. If one or more sense an over-
heat condition, a signal is sent to the red REAR
BAY OVHT annunciator on the MWS center
panel and also to both MWS red flashers.
Figure 8-2 shows the location of the rear bay
overheat detector switches.
FIRE EXTINGUISHING
ENGINE FIRE EXTINGUISHING
Two dual-head, single-shot fire extinguisher
bottles are located in the rear equipment bay.
Each bottle is capable of discharging its total
store of agent into zone 1 of either engine.
Therefore, the pilot can select both extin-
guishers for either engine or a single shot for
each engine.
Revision 1
8-3
FOR TRAINING PURPOSES ONLY
OVERHEAT
DETECTOR
SWITCHES
OVERHEAT
DETECTOR
SWITCHES
REAR BAY
OVHT
RAM-AIR
EXHAUST
Figure 8-2. Rear Equipment Bay Detection
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