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General Description
These are the components of the APU fire detection system:
* APU fire detectors
* Engine and APU fire detection module
* Glareshield, P7 panel
* Engine and APU fire control panel
* APU remote control panel, P28.
* Aural warning unit
* APU electronic control unit.
Fire detectors on the APU send signals to the engine and APU
fire detection module. This module will supply aural and visual
indications in the flight compartment. Also, the module sends
signals to the APU control unit to automatically shutdown the
APU.
The APU remote control panel gives the external indications of
an APU fire. A horn and red light operate alternately at a one
per second rate.
Overheat/Fire Test
You use the TEST switch on the engine and APU remote control
panel. In the OVHT/FIRE position, the indications in the flight
compartment and on the APU remote control panel are the
same as for a real fire condition. If the test fails, use the engine
and APU fire detection module to isolate the fault.
Fault/Inop Test
You use the TEST switch on the engine and APU fire control
panel. In the FAULT/INOP position, the indications in the flight
compartment are the same as a real fault condition. If the test
fails, use the engine and APU fire detection module to isolate
the fault.
FIRE PROTECTION - APU FIRE DETECTION - GENERAL DESCRIPTION
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Purpose
The APU fire detectors monitor for high temperatures in the
APU compartment.
General Description
The APU has three detectors. The detectors monitor three
sections of the APU. In each section, one detector attaches to a
support tube with clamps. There is one loop for the APU fire
detection.
Physical Description
Each detector has these parts:
* Fire and fault pressure switches
* Resistors
* Terminal stud
* Stainless steel, gas charged tube.
Location
These are the locations of the APU fire detectors:
* Upper APU compartment
* APU compartment door
* Tailpipe.
Detector Characteristics
Detector Location Fire
Upper APU Compt 450F (232C)
Lower APU Compt 450F (232C)
Tailpipe 275F (135C)
Operation
The two pressure switches sense for these conditions:
* Fire
* Fault (loss of gas pressure).
Gas pressure in the sense tube holds the fault pressure switch
in the closed position. The other pressure switch closes when
the gas pressure increases because of a fire condition.
The fire signals go to the engine and APU fire detection module.
This module supplies the fire indication in the flight
compartment.
See the engine fire detection section for more information on
the engine and APU fire detection module. (SECTION 26-11)
If the pressure in the sense tube decreases, the fault switch
opens. This switch sends the fault signal to the engine and APU
fire detection module.
FIRE PROTECTION - APU FIRE DETECTION - APU FIRE DETECTOR
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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FIRE PROTECTION - APU FIRE DETECTION - APU FIRE DETECTOR
FIRE PROTECTION - APU FIRE DETECTION - APU FIRE DETECTOR
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Functional Description
At the fire temperature set point, the gas expands in the
detector and closes the FIRE pressure switch. This decreases
the resistance of the detector.
The engine APU control module uses this change in resistance
to set the fire condition. These are the results of a fire condition:
* APU fire handle light comes on
* APU fire handle switch unlocks
* Two red FIRE WARN lights come on
* Aural warning unit gives the bell sound
* APU automatic shutdown
* APU remote horn and light come on.
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