MAIN CABIN SMOKE DETECTION SYSTEM - TROUBLE SHOOTING
EFFECTIVITY
Passenger/Cargo Convertible Airplanes
1. General
A.  Most main cabin smoke detection system failures can be quickly detected by operation of the test switch on fire protection module P8-1. System faults can be readily recognized by observing the cargo smoke indicator lights on P8-1 and using the associated trouble-shooting chart.
B.  System lights should be tested by manually pressing each light before assuming the system is faulty. If both cargo smoke lights illuminate when the system is tested, but the fire warning lights do not illuminate and the fire bell does not ring, P8-1 is faulty.
C.  Since the test switch on P8-1 is used by other systems besides the smoke detector system, it is important to isolate all other systems by pulling their main circuit breakers before attempting to trouble shoot the main cabin smoke detection system. All necessary circuit breakers are under the fire protection detection portion of load control center P6. Refer to the trouble shooting charts.
D.  Whenever the fire protection module (P8-1) is removed and replaced, a test must be performed on the main cabin smoke detection system (Ref Main Cabin Smoke Detection System -Adjustment/Test).
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4.  Smoke Detector Lamp Checks
A.  The smoke detector test circuit includes the filaments of both lamps in the smoke detector. If either lamp is burned out, there will be no smoke detector response when tested. Before replacing an apparently faulty smoke detector, check lamps as follows:
(1)  
Remove smoke detector shroud.

(2)  
Remove perforated cover of smoke detector involved by releasing dzus fasteners.

(3)  
Unscrew one of the two lamp holder inserts in labyrinth. Replace lamp with one of the two spares located in the spare lamp receptacles mounted on the baseplate. Replace lamp holder insert.

(4)  
Repeat smoke detector test. If now operative, replace lamp used from spare lamp receptacle, replace cover and shroud. If not operative, repeat lamp test procedures for the other lamp holder insert.

(5)  
If not operative after testing both lamps, replace smoke detector.
(Refer to Smoke Detector, 26-16-11.)

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MAIN CABIN SMOKE DETECTION SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
Passenger/Cargo Convertible Airplanes

1. General
A.  The smoke detection system tests consist of operationally testing the entire system using the test switch on fire protection module P8-1 and testing system tubing leakage. Test the system whenever an electrical component has been replaced. Test system tubing leakage whenever tubing has been repaired or replaced.
2.  Main Cabin Smoke Detection System Test (Fig. 501)
A.  Main Cabin Smoke Detection System Operation Test
(1)  
Equipment and Materials

(a) Smoke source capable of producing small quantities of smoke as required.

(2)  
Prepare for Test

(a)  
Provide electrical power

(b)  
Open the following circuit breakers under fire protection detection on panel P6. 1) Engine -1 2) Engine -2 3) APU 4) Wheel Well – Wing –Body Overheat

(c)  
Check that the following circuit breakers are closed on panel P6. 1) Cargo Smoke 2) Master Warning and Control

(3)  
Test Main Cabin Smoke Detection System Operation

(a)  Hold the TEST switch on fire protection module P8-1 to OVHT INOP - SMOKE A. Observe that the FWD and AFT CARGO SMOKE lights and master fire warning lights illuminate and the fire alarm bell sounds.
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(b)  
While still holding the test switch press the bell cutout switch on P8-1. Observe that the master fire warning lights go out, the alarm bell stops and the cargo smoke lights remain illustrated.

(c)  
Release the test switch. Observe that the cargo smoke lights go out.

(d)  
　
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