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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-17-00-003
Purpose
The compartment overheat detection controller monitors
sensing elements for overheat and fire conditions in the
wheel well and the wing and body areas.
Physical Description
The control circuits for the wing and body overheat detection
are in the controller. The front panel has these components:
* MAINT ADV (maintenance advisory) light
* LED display
* BITE instructions
* Four BITE control switches (MEM READ, MEM CLEAR, LOC
TEST and DISP TEST).
Location
The compartment overheat detection controller is in the
electronic equipment compartment on the E1-4 rack.
BITE Test Switches and Indications
The non-volatile memory provides a storage area for ten fault/
alarms. Failure of the control cards, power supply card, loss of
ac or dc power are not stored. These failures are coded 00 to 05.
Short circuit faults are stored as alarm codes.
MEM READ (memory read switch), accesses the non-volatile
memory.
MEM CLEAR (memory clear switch), clears the non-volatile
memory. The existing faults and alarms can not be cleared until
corrected.
LOC TEST (local test switch), initiates a test sequence of the
control circuits and detector elements. This test will display
codes 00 to 05, open loop codes and short loop codes.
DISP TEST (display test switch), verifies correct operation of the
control circuits. This is indicated by code 88 being displayed.
MAINT ADV (maintenance advisory light), is on when a fault or
an alarm is stored in the non-volatile memory. The light does
not come on with codes 00 to 05.
FIRE PROTECTION - WHEEL WELL OVERHEAT DETECTION - COMPARTMENT OVERHEAT DETECTION CONTROLLER
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-17-00-004
FIRE PROTECTION - WHEEL WELL OVERHEAT DETECTION - COMPARTMENT OVERHEAT DETECTION CONTROLLER
FIRE PROTECTION - WHEEL WELL OVERHEAT DETECTION - COMPARTMENT OVERHEAT DETECTION CONTROLLER
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-17-00-004
Functional Description
The compartment overheat detection controller supplies power
to the sensing elements. The microprocessor monitors the
wheel well sensing elements for alarm conditions.
If the microprocessor senses a wheel well fire, it keeps the
alarm in memory and sets the fire condition. These are the
indications of a wheel well fire:
* Two red FIRE WARN lights on P7 panel come on
* Aural warning unit gives the bell sound
* Red WHEEL WELL light on the engine and APU fire control
panel comes on
* MAINT ADV light on the compartment overheat detection
controller comes on.
Move thetest switch to the OVHT/FIRE position to start a test of
the wheel well fire detection system. The test alarm inputs are
not kept in memory.
The test does a check of the continuity of the sensing element. If
the sensing element has continuity, the indications are the
same as during a real alarm. If the sensing element does not
have continuity, there are no indications in the flight
compartment.
There is no difference between a real alarm and a short circuit.
If there is a short circuit, the indications are the same as for a
real alarm.
Training Information Point
For the indications and test of the wheel well fire system, 115v
ac power must be on.
FIRE PROTECTION - WHEEL WELL OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-17-00-005
FIRE PROTECTION - WHEEL WELL OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
FIRE PROTECTION - WHEEL WELL OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-17-00-005
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26-18-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The wing and body overheat detection system uses sensing
　
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