(52)
Push in the two fire switches to close.

(53)
Push the left MASTER CAUTION light or the right MASTER CAUTION light.

(54)
Make sure that the two MASTER CAUTION lights and the OVHT/DET annunciator go off.

(55)
Make sure these lights stay on:

(a)  
The ENG 1 OVERHEAT light

(b)  
The ENG 2 OVERHEAT light

(56)
Push the left annunciator light or the right annunciator light on the P7 panel.

(57)
Make sure the two MASTER CAUTION lights come on.

(58)
Make sure the OVHT/DET annunciator light comes on.

NOTE: Ignore other master caution annunciator lights that come on.

(59)
Release the TEST switch on the P8-1 panel.

(60)
Make sure these lights on the P8-1 panel go off:

(a)  
The ENG 1 OVERHEAT light

(b)  
The ENG 2 OVERHEAT light

(61)
Make sure these lights on the P7 panel go off:

(a)  
The two MASTER CAUTION lights

(b)  
The OVHT/DET annunciator

(62)
Try to pull out the engine 1, the engine 2, and the APU fire switches on the P8-1 panel.

NOTE: The switches must stay in the locked position.
F.  Test the OVHT DET Switches
(1)  
Move the two OVHT DET switches from the NORM position to the FIRE position.

(2)  
Hold the TEST switch on the P8-1 panel to the OVHT position.

(3)  
Make sure all overheat indicators stay off.

(4)  
Release the TEST switch on the P8-1 panel.

(5)  
Hold the TEST switch on the P8-1 panel to the FIRE position.

(6)  
Make sure these lights on the P8-1 panel come on:

(a)  
All of the lights in the engine-1 fire switch

(b)  
All of the lights in the engine-2 fire switch

(c)  
All of the lights in the APU fire switch

(7)  
Make sure the two FIRE WARN lights on the P7 panel come on.

(8)  
Make sure the alarm bell in the control cabin operates.

(9)  
Make sure the warning horn in the right main wheel well comes on and goes off continuously.

(10)
Make sure the fire warning light in the main wheel well flashes.

(11)
Release the TEST switch on the P8-1 panel.

(12)
Move the two OVHT DET switches on the P8-1 panel to the NORM position.

(13)
Make sure there are no fire indications.

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26-11-0 Page 508  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 01/95 

G.  Test the Fault Circuits in the Fire Warning System
(1)  
Hold in the DET TEST switch on the M279 module.

(2)  
Make sure the four Eng-1 and Eng-2 overheat and fire detector inoperative lights on the M279 module come on.

(3)  
Release the DET TEST switch.

(4)  
Make sure the four lights on the M279 module go off.

(5)  
Make sure all lights on the P8-1 panel are off.

H.  Put the airplane back to its usual condition.
(1)  
Try to pull the engine 1, the engine 2, and the APU fire switches on the P8-1 panel; the switches must stay in the locked position.

(2)  
Close these circuit breakers:

(a)  P6 Load Control Center - Right 1) WHEEL WELL WING AND LWR BODY OVHT 2) EXTINGUISHER BOTTLES RIGHT 3) EXTINGUISHER BOTTLES LEFT 4) EXTINGUISHER BOTTLE RIGHT (if installed) 5) EXTINGUISHER BOTTLE LEFT (if installed) 6) EXTINGUISHER BOTTLES APU 7) CARGO SMOKE (Passenger/Cargo Convertible Airplanes)

(3)  
Remove electrical power if it is no longer necessary (Ref\24-22-0\MP).

5C4 
Oct 20/90  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  26-11-0 Page 509 

ENGINE FIRE DETECTION SYSTEM - DESCRIPTION AND OPERATION
EFFECTIVITY
WA ALL EXCEPT N4502W thru N4530W, N4569N, N4571M, N235WA CA B-2509
1.  General
A.  The engine fire detection system provides fire detection for each engine and firewall. Fire detection is provided by shrouded detectors on the horizontal firewall and along the bottom of the engine. The detection system is an electrical heat sensing system that responds to general overheat or localized fire by activating warning lights and an alarm bell.
B.  The engine fire detection system consists of the engine and APU fire control module, engine and APU fire detection accessory unit, alarm bell, master warning and caution lights, and detectors. Each sensor is connected to the engine and APU fire detection accessory unit. The accessory unit contains control cards, test circuits and warning component control circuits. The detector control card monitors the electrical resistance of their associated sensors. The control card circuit discriminates between a fire and overheat or a short circuit and actuates overheat or fire warning lights and alarm bell. The detector inoperative light will illuminate when a short is sensed in the detection circuit.
　
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