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fire detection module.
FIRE PROTECTION - ENGINE FIRE DETECTION - ENGINE FIRE DETECTORS
EFFECTIVITY
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FIRE PROTECTION - ENGINE FIRE DETECTION - ENGINE FIRE DETECTORS
FIRE PROTECTION - ENGINE FIRE DETECTION - ENGINE FIRE DETECTORS
EFFECTIVITY
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Purpose
The engine and APU fire detection module monitors detectors
for overheat and fire conditions on the engine. Also it monitors
for fire conditions on the APU.
Physical Description
The control circuits for the engine overheat and fire, and the
APU fire detection are in the module. The front panel has these
components:
* ENGINE 1 LOOP A amber fault light
* ENGINE 1 LOOP B amber fault light
* ENGINE 2 LOOP A amber fault light
* ENGINE 2 LOOP B amber fault light
* APU amber fault light
* Three red FAULT DISPLAY lights
* FAULT/INOP test switch.
Location
The engine and APU fire detection module is on the electronic
equipment compartment on the E2-2 shelf.
Operation
During normal conditions, all front panel lights are off. When a
fault condition occurs, the related FAULT AREA light comes on.
The FAULT DISPLAY lights show a fault code.
When you push the FAULT/INOP test switch, faults are
simulated to do a check of the circuit ability to detect a fault. If
the circuits operate correctly, all lights on the front panel come
on. If a light does not come on, it shows a faulty circuit
operation.
The FAULT DISPLAY lights show the type of fault and the
detector location.
Fault Signal Priorities
When there are multiple engine loop faults (two or more amber
lights on), this is the display priority:
Highest Priority Engine 1 Loop A
Engine 1 Loop B
Engine 2 Loop A
Engine 2 Loop B
Lowest Priority APU
If there is more than one fault, the lower priority fault does not
show until you isolate the higher priority fault.
FIRE PROTECTION - ENGINE FIRE DETECTION - ENGINE AND APU FIRE DETECTION MODULE
EFFECTIVITY
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FIRE PROTECTION - ENGINE FIRE DETECTION - ENGINE AND APU FIRE DETECTION MODULE
FIRE PROTECTION - ENGINE FIRE DETECTION - ENGINE AND APU FIRE DETECTION MODULE
EFFECTIVITY
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FIRE PROTECTION - ENGINE FIRE DETECTION - ENGINE AND APU FIRE DETECTION MODULE
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Functional Description
The OVHT DET switch on the engine and APU fire control panel
permits selection of the mode of operation. Each switch has
these positions:
* NORMAL - makes loop A and loop B agree before the alarm
condition operates
* A - makes loop A the only sense authority
* B - makes loop B the only sense authority.
At the overheat temperature set point, the gas expands in the
detector and closes the OVERHEAT pressure switch. This
decreases the resistance of the detector.
The engine and APU fire detection module uses this decrease
in resistance to set the overheat condition. These are the results
of an overheat condition:
* MASTER CAUTION and OVHT/DET annunciator lights come
on
* Related engine fire handle switch unlocks
* Related ENG OVERHEAT light comes on.
At the fire temperature set point, the gas expands more to close
the FIRE pressure switch in the detector. This decreases the
resistance further.
The engine and APU fire detection module uses this signal to
set the fire condition. These are the results of a fire condition:
* Two red FIRE WARN lights
* Aural warning unit bell
* Related engine fire warning switch lights
* Related overheat indications stay on.
The FAULT/INOP test does a check of the module fault detection
circuitry and related flight compartment indications. These are
　
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