S 714-014

 (4)  
Do the Wheel Well Overheat Dectection Operational Test (AMM 26-17-00/501).

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 ALL  ú ú 02 Page 402 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

SHELF ASSY
TYPICAL MATED ELECTRICAL CONNECTORS

NOTE:DIMENSIONS MAY BE MEASURED

0.09 INCH MAX FOR ANY CONNECTOR FULLY
BY PUTTY OR A PAPER SLEEVE MATED (ALTERNATE METHOD)
OR RING OF A SUITABLE LENGTH
THAT WILL BE CRUSHED WHEN THE
CONNECTOR IS MATED PROPERLY.

Electrical/Electronic Black Box Installation Figure 401
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 ú  01  Page 403
 ú  Jul 15/91 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 ú
 ú  S 714-017
 ú  (5)  Do the Wing and Lower Aft Body Overheat Detection Operational Test
 ú  (AMM 26-18-00/501).

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 ALL  ú ú 01.1 Page 404 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

A
737-300/400/500MAINTENANCE MANUAL
 ENGINE FIRE DETECTION - DESCRIPTION AND OPERATION
_________________________________________________
General
_______
 A.  The engine fire detection system monitors engine and nacelle temperature for fire and overheat conditions. Dual-loop fire/overheat detectors are in each engine area.
 B.  The system uses power from the 28-volt dc battery bus. The circuit breakers are on panel P6.
 C.  Engine fire detection system components are fire detectors, engine and
 APU fire detection accessory unit, and engine and APU fire control panel.Engine Fire/Overheat Detectors (Fig. 1)
______________________________
 A.  A detector consists of two identical sensing elements attached to a support tube by quick-release mounting clamps.
 (1)  
Each sensing element is part of a continuous electrical resistance loop, with resistance varying inversely as a function of temperature.

 (2)  
As the temperature of the element increases, resistance decreases. When resistance lowers to the first alarm setting, an overheat signal is sent to the control card. When resistance continues to lower to the second setting, a fire alarm signal is sent.

 (3)  
The detectors are identical except for length, temperature trip and reset settings.

 B.  The engine fire detectors are in strut, fan upper, fan lower, and engine
 core areas.Engine and APU Fire Detection Accessory Unit (Fig. 1)
____________________________________________
 A.  Engine fire detection system components of the engine and APU fire detection accessory unit are engine 1 and 2 control cards and interface logic cards. The unit is on shelf E3-3 of the electronics rack.
 B.  Control Cards
 (1)  
Each engine has a corresponding control card. These cards constantly monitor and process signals produced by detector loops. The cards send alarm or fault signals to the accessory control card.

 (2)  
The cards send alarm or fault signals to the interface logic cards.

 C.  Interface Logic Cards
 (1)  The interface logic cards interpret detection control card signals, provide tests, and send fire/overheat warning and fault indication signals to the fire control panel.
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