(e)  
Check that the equipment cooling blower is on.

(f)  
Generate smoke at each of the following sensing ports and observe that the FWD CARGO SMOKE light illuminates, the master fire warning lights illuminate and the fire alarm bell sounds in each case (Fig. 501).

NOTE:  Allow the cargo light and alarms to go off before proceeding to the next station.
1) Station 344, electronic equipment compartment
2) Station 449, right side
3) Station 500A + 7, left side
4) Station 607, right side

(g)  Generate smoke at each of the following sensing ports and observe that the AFT CARGO SMOKE light illuminates, the master fire warning lights illuminate and the fire alarm bell sounds in each case.
NOTE:  Allow the cargo light and alarms to go of before proceeding to the next station.
1) Station 698, left side
2) Station 727B + 12, right side
3) Station 839, left side
4) Station 940, right side

501 
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H21726
527  Smoke Detection System Test Connections 
Feb 20/92  Figure 501  26-16-0 
Page 503 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(h)  
Close the following circuit breakers:
1) Engine -1
2) Engine -2
3) APU
4) Wheel Well - Wing - Body Overheat

(i)  
If no longer required, remove electrical power from airplane.

B.  Main Cabin Smoke Detection Tubing Leakage Test
NOTE:  This test has two methods to measure the leakage of the smoke sense tubes. Method 1 measures the flow rate through the tubes. Method 2 measures the pressure differential in the tubes. You can use whichever method you prefer.
(1)  Equipment and Materials
(a)  
Air vacuum source capable of drawing a continuous airflow of 4.0 scfm at 5 inches of water gage and 4 inches of mercury gage at no flow.

(b)  
Plugs or tape used for sealing the sensing inlets.

(c)  
To measure the differential pressure (method 2) 1) Tank (2.0 ft3) with a vacuum gage, valve, and port to connect the tank to the tubing system.

2)  Flexible tubing used to connect the tank port to the tubing system. The tubing length must not exceed 100 ft and the tubing ID must not exceed 3/8 inch.

(d)  
To measure the flow rate (method 1): 1) Vacuum gage 2) Rotameter - P/N 10A1450N (Stock No. 821A14U45) Fischer & Porter,

Warminister, Pennsylvania, 18974
(2)  Test Forward Smoke Detector System Tubing
(a)  
Plug the sensing point inlet tubes in the electronic equipment compartment at station 333 or 334 and in the dado panel at station 449.

(b)  
Plug the sensing point inlet tubes in the dado panel at station 500A + 7 and in the air grille at station 607.

(c)  
Remove equipment cooling blower access panel.

(d)  
Disconnect the forward smoke detection system tubing from the electronic cooling exhaust air duct between stations 344 and 360 (Detail A, Fig. 501).

(e)  
To measure the differential pressure (method 2), do the steps that follow: 1) Connect the tank to the forward smoke detection tubing at the tubing

connection. 2) Connect the vacuum source to the valve on the tank. 3) Open the valve on the tank and pull the tank down to a pressure differential of
3.0 in Hg. 4) Close the valve on the tank. Verify that the rate of change of the pressure does
not exceed 0.75 inch Hg/min. 5) Disconnect the vacuum source from the tank and open the valve. 6) Disconnect the tank from the tubing connection.
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7)  Reconnect the tubing from the sensing inlet to the electronic cooling intake duct at the tubing connection.
(f)  
To measure the flow rate (method 1), do the steps that follow: 1) Connect vacuum source with rotameter and gage to the forward smoke detection system tubing. 2) Pull a vacuum of 3 + 0.5 inches of mercury. Observe that the leakage does not

exceed 0.10 scfm.
3) Disconnect the vacuum source and reconnect tubing.

(g)  
If the leakage is greater than specified, do the Test A and Test B forward smoke detector tubing. If the leakage was less than specified, you do not have to do the Test A or Test B forward smoke detector tubing.

(3)  Test A Forward Smoke Detector Tubing
　
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