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 C.  The overheat detection system can be tested by operation of the TEST switch on the engine and APU fire control module. The switch tests continuity through the wheel well system by simulating an overheat condition and energizing the alarm bell and warning lights.
Engine and APU Fire Control Module Components (Fig. 1)
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 A.  Wheel Well Warning Light
 (1)  A warning light indicates overheat in the wheel well area.
 B.  Test Switch
 (1)  Holding the switch to the fire position operates control circuits in the accessory unit which simulate overheat in the wheel well. The wheel well overheat warning components are then energized.
 C.  Bell Cutout Switch
 (1)  The switch can be pressed to silence the fire alarm bell and
 extinguish the master fire warning lights.AIRPLANES WITH BOEING M237 COMPARTMENT OVERHEAT ACCESSORY UNIT; Compartment Overheat Accessory Unit Components (Fig. 1)
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 A.  The compartment overheat accessory unit is on electronic equipment rack E3 in the electronic compartment.
 B.  Temperature Control Unit A4
 (1)  The temperature control unit plugs into the accessory unit and is held in place by screws. The temperature control unit contains circuitry to continuously monitor the sensing element resistance and provide an alarm signal when the element resistance drops to the trip level. When the overheat condition has passed, the system returns to its standby condition.
 C.  Compartment Overheat Unit A5
 (1)  The compartment overheat unit is a printed circuit card which plugs into the compartment overheat accessory unit and is held in place by screws. The card provides turn-on and cutout control of the alarm bell and master fire warning lights.
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737-300/400/500
MAINTENANCE MANUAL

 

COMPARTMENT OVERHEAT ACCESSORY UNIT SEE

TYPICAL CAUTION-WARNING LIGHTS

F A U L T  B NORMAL A ENG 1 OVERHEAT A I N O P O V H T F I R E OVHT DET TEST  DISCH L R R  A WELL INOP A A R WHEEL FAULT APU DET APU BOTTLE DISCHARGED  BUTTON UNDER HANDLE FIRE SWITCHES PULL WHEN ILLUMINATED (FUEL SHUTOFF) ENG 2 OVERHEAT A R A B NORMAL LOCK OVERRIDE: PRESS OVHT DETBELL CUTOUT DISCH  APU A L G G L R R E X T T E S T 1 ENGINES L BOTTLE DISCHARGE R BOTTLE DISCHARGE DISCH  A R G 2 

ENGINE AND APU FIRE CONTROL MODULE

Wheel Well Overheat Detection System Equipment Location
Figure 1 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Wheel Well Overheat Detection System Equipment Location
Figure 1 (Sheet 2)

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A 737-300/400/500MAINTENANCE MANUAL
BOEING MODULE FENWAL MODULE
CC

Wheel Well Overheat Detection System Equipment Location
Figure 1 (Sheet 3)

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 4.
5.

6.

7.

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737-300/400/500MAINTENANCE MANUAL
 D.  Test Relay
 (1)  A wheel well overheat test relay is in the wheel well test circuit. When the test circuit is operated, the relay closes and connects a resistor and ground to the sensing circuits, thus simulating a fire condition.
　
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