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elements adjacent to the pneumatic ducts. It monitors the
pneumatic distribution system ducts for overheat conditions.
When the system detects an overheat condition, alarm
indications turn on in the flight compartment. The indications
are on the P7 glareshield panel and on the P5 air conditioning/
bleed air controls panel.
FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - INTRODUCTION
EFFECTIVITY
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General Description
These are the major components of the wing and body overheat
detection system:
* Wing/body overheat sensing elements
* Compartment overheat detection controller
* Air conditioning panel.
The wing and body overheat detection system uses a single
overheat sensing loop.
The detector loop in the left and right wing and body supplies
overheat and fault signals to the compartment overheat
detection controller. This controller uses the signals to give
overheat or fault indications in the flight compartment on the air
conditioning panel. The fault signals show on the compartment
overheat detection module.
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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 have a 00 to 05
code. Short circuit faults are stored as alarm codes.
The MEM READ (memory read) switch gets access to the nonvolatile
memory.
The MEM CLEAR (memory clear) switch clears the non-volatile
memory. The existing faults and alarms can not be cleared until
corrected.
The LOC TEST (local test) switch starts a test sequence of the
control circuits and detector elements. This test will show codes
00 to 05, open loop codes and short loop codes.
The DISP TEST (display test) switch does a check of the control
circuits. This shows by code 88.
The 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 - WING AND BODY OVERHEAT DETECTION - COMPARTMENT OVERHEAT DETECTION CONTROLLER
　
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