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FIRE PROTECTION
Volume 2 Flight Crew Operating Manual Sep 13/2004
09-01-08 CSP 100-6 REV 1
AUXILIARY POWER UNIT FIRE PROTECTION
DESCRIPTION
The auxiliary power unit (APU) fire detection system functions by detecting an overheat condition within the APU enclosure.
An APU fire can only be extinguished from bottle No. 2.
The APU fire protection has a ground mode for unattended operation and a flight mode.
On the ground, when a condition is detected, the APU shuts down automatically. Five seconds later, the APU fire bottle
automatically discharges Halon into the APU enclosure.
In flight, when a fire condition is detected and the APU FIRE switch is pushed, the APU shuts down and arms the discharge
cartridge on the number 2 container. The flight crew must discharge the bottle by pushing the FIRE EXT 2 switch.
COMPONENTS AND OPERATION
DETECTION LOOPS
The APU enclosure is fitted with dual fire detection loops. The loops are connected to the fire detection and extinguishing
control unit. The loops are constructed of an outer metal sheathing and two internal wires that are separated by an insulating
material (thermistor). One of the wires carries electrical current, the other is grounded to the outer sheathing at the control
unit. The resistance of the thermistor decreases with an increase in temperature.
When the electrical resistance decreases to a trip point, electrical current from the live internal wire conducts to the second
internal wire and a fire indication is generated.
This dual loop system minimizes the possibility of false fire warnings. Both loops must sense the fire or overheat condition
under exacting parameters before flight deck fire indications are generated.
ENGINE
L ENG FIRE
FIRE FIRE
2
ARMED
1
ARMED
APU FIRE
OFF ON
FIRE EXT
IGNITION
SYNC MACH HOLD
N1
OFF N2
EVENT
ON
AUTO APR
OFF
R STARTER
CRANK START
OFF
CRANK START
L STARTER
R ENG FIRE
FIRE
FIREX
CONTROL
UNIT FLIGHT COMPARTMENT
APU
ECU
FIRE
APU FIRE
APU SHUT DOWN
FIRE ELEMENT
APU COMPARTMENT
APU
CFO0901002_003
APU
AUTO
FIRE PROTECTION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 09-01-09
AUXILIARY POWER UNIT FIRE PROTECTION (Cont)
FIRE EXTINGUISHER BOTTLE
Discharge of bottle 2 to the APU compartment is controlled exclusively by the cockpit APU FIRE switch during flight.
Discharge to the APU on the ground can be commanded by either the cockpit switch or automatically by the FIREX-CU
during APU unattended mode operation. For both the main powerplants and APU, two switches are required to discharge
the extinguisher. The first switch is a guarded latching switch that shuts down and isolates the engine/APU and arms the
corresponding discharge cartridges on the bottle(s). The second switch is a momentary switch that applies discharge current
to the selected cartridge. A pressure switch, a pressure gauge and one explosive squib for the APU, is installed on the fire
bottle. The bottle is filled with Halon 1301.
APU FIRE SWITCH
If a fire is detected in the APU enclosure, the APU FIRE switch illuminates (along with the master warning light, the master
warning chimes, an APU FIRE (W) CAS message, and the aural APU FIRE). When the APU FIRE switch is depressed:
- Bottle 2 squib is armed and EXT 2 switch illuminates ARMED
- APU fuel shutoff valve closes
- APU electronic control unit closes the APU fuel metering valve
- APU bleed-air shutoff valves closes
- APU generator is selected offline
ENGINE
L ENG FIRE
FIRE FIRE
2
ARMED
1
ARMED
APU FIRE
OFF ON
FIRE EXT
IGNITION
SYNC MACH HOLD
N1
OFF N2
EVENT
ON
AUTO APR
OFF
R STARTER
CRANK START
OFF
CRANK START
L STARTER
R ENG FIRE
FIRE
AUTO
REV 1
FIRE PROTECTION
Volume 2 Flight Crew Operating Manual Sep 13/2004
09-01-10 CSP 100-6 REV 1
MAIN LANDING GEAR OVERHEAT DETECTION
DESCRIPTION
The Challenger 300 includes two main landing gear bays (MLG), also referred to as main wheel wells. due to the possibility
of brake or tire overheat during takeoff and the fact that the MLG bays are constructed from composite material, an overheat
detection system has been installed as part of the aircraft’s FIREX system.
CFO1501002_003
OVERHEAT
DETECTOR
FIRE DETECTION/EXTINGUISHING
SYSTEM CONTROL UNIT
　
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