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EFFECTIVITY
GUN ALL 26-18-00
Page 8
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-18-00-003
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - COMPARTMENT OVERHEAT DETECTION CONTROLLER
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - COMPARTMENT OVERHEAT DETECTION CONTROLLER
EFFECTIVITY
GUN ALL 26-18-00
Page 9
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-18-00-003
Functional Description
The compartment overheat detection controller supplies power
to the sensing elements. The microprocessor monitors the
wing/body sensing elements for overheat conditions.
If the microprocessor detects a wing/body overheat, it keeps the
alarm in memory and sets the overheat condition. These are the
indications of a wing/body overheat:
* Left, right amber WING-BODY OVERHEAT light comes on the
air conditioning panel
* MASTER CAUTION and AIR COND annunciator lights come
on
* MAINT ADV light on the compartment overheat detection
controller comes on.
Push and hold the P5 OVHT TEST switch for 5 seconds to start a
test of the wing and body overheat detection system. The test
alarm inputs are not kept in the memory.
The test does a check of the continuity of the sensing elements.
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 the real alarm and a short
circuit. If there is a short circuit, the indications are the same as
for a real alarm.
The faulty sensing element (no continuity or a short circuit) can
be found by the coded indications on the compartment overheat
detection controller.
Training Information Point
For the indications and test of the wing/body overheat system,
115v ac power must be on.
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 26-18-00
Page 10
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-18-00-004
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 26-18-00
Page 11
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-18-00-004
Functional Description
Overheat sensing elements in the left and right wing/body
supply the overheat detection signal. The signal goes to the
compartment overheat detection controller. This controller
supplies the overheat alarms.
These are the flight compartment indications of a wing and body
overheat:
* Left, right amber WING BODY OVERHEAT light on the air
conditioning panel come on
* MASTER CAUTION and AIR COND annunciator lights come
on.
If the wing and body overheat indications come on due to a real
overheat or a fault, the MAINT ADV light on the compartment
overheat detection controller also comes on. Use the module to
do a check for real overheat condition or a fault condition.
Wing and Body Overheat Test
The wing and body overheat detection test is with the OVHT
TEST switch on the air conditioning panel. If the test passes, the
indications in the flight compartment are the same as for a real
overheat condition. If the test fails, use the compartment
overheat detection controller to isolate the fault.
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 26-18-00
Page 12
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-18-00-005
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 26-18-00
Page 13
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-18-00-005
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
　
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