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(1)  On 737-200 series passenger airplanes incorporating Service Bulletin 26A1081, there is also a cargo fire control panel located on the aft control stand electronic panel (P8), that indicates fire in the cargo areas, and from which fire extinguishing agent can be dispensed to the forward or aft lower cargo area (Fig. 1).
3.  Lightshield Module
A.  The lightshield module (P7) contains master fire warning and master caution lights and the annunciator lights necessary to warn the captain and first officer of a fire or overheat condition. For further information on the module, refer to system coverage and Chapter 33, Master Caution and Warning Lights.
4.  Remote APU Fire Control Panel
A.  The remote APU fire control panel (P28) contains the components necessary to visually check for a fire warning in the APU, to control the remote horn and alarm bell and to control the APU fire extinguishing system from the ground. The fire panel is located on the aft bulkhead of the right main wheel well. For detailed coverage of components, refer to applicable system coverage.
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EFFECTIVITY
AIRPLANES INCORPORATING SB 26A1081

K15683
501  Fire Protection System Panels Locations 
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EFFECTIVITY
AIRPLANES INCORPORATING
SB 26A1081

K15686
Cargo Compartment Smoke Detection and Fire Suppression Component Location  500 
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DETECTION - DESCRIPTION AND OPERATION
1.  General
A.  Detection is separated into two categories; fire and overheat. The detection systems include the following subsystems; engine fire detection system, auxiliary power unit (APU) fire detection system, wheel wel1 overheat detection system, and wing and lower aft body overheat detection system. The fire detection systems are basically dual loop detectors (engines) and single loop detector (APU) circuits with the sensing elements spirally wrapped about a rigid support tube and connected to the engine and APU fire detection accessory unit. The overheat detection systems are single loop detector circuits connected to the compartment overheat detection accessory unit.
2.  Engine and APU Fire Detection Accessory Unit (Control Module)
A.  The engine and APU fire detection accessory unit contains all components necessary for fire detection, except the sensing elements, system control switches and indicators. The accessory unit is located on electronic equipment rack E3 in the electronic compartment. The accessory unit contains a detector control card for each sensing loop in the engine and APU areas, relays for fire warning and short circuit discrimination tests, aural warning and master warning light control circuits, a detector test switch and four amber detector inoperative lights (Fig. 1).
3.  Compartment Overheat Detection Accessory Unit (Control Module)
A.  The compartment overheat detection accessory unit contains all components necessary for overheat detection, except the sensing elements, system control switches and indicators. The accessory unit is located on electronic equipment rack E3 in the electronic compartment. The accessory unit contains three overheat control units; an alarm cutout control card; a wheel well overheat test relay; an overheat test relay; test switches and a test light. The overheat control units are connected to sensing loops in the wheel well area, the right overheat section and the left overheat section (Fig. 1).
4.  Bleed Air Duct Overheat Test and Indication Section
A.  The bleed air duct overheat test and indication section is part of the air conditioning module P5-10 on overhead panel P5 and contains the left and right overheat detection system lights to provide a visual means of monitoring overheat conditions along the air conditioning bleed air ducts. A test switch provides the means to test the overheat detection system (Fig. 1). For further information on the module, refer to system coverage and Chapter 21, Air Conditioning.
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H27548
Detection Systems Accessory Unit Location  539 
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ENGINE AND APU FIRE DETECTION ACCESSORY UNIT - REMOVAL/INSTALLATION
　
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