(b)  
Disconnect inlet tube to the A forward smoke detector from the bulkhead fitting (Detail B, Fig. 501).

(c)  
To measure the differential pressure (method 2), do the steps that follow: 1) Connect the tank to the tubing at the inlet fitting. 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 inch. 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 inlet fitting. 7) Reconnect the tubing from the sensing inlet to the A forward smoke detector at
the inlet fitting.
(d)  To measure the flow rate (method 1), do the steps that follow: 1) Connect vacuum source with rotameter and gage to the exposed bulkhead fitting. 2) Pull a vacuum of 3 + 0.5 inches of mercury. Observe that the leakage does not
exceed 0.05 scfm.
3) Disconnect the vacuum source and reconnect inlet tubing.

(4)  Test B Forward Smoke Detector Tubing
(a)  
Make sure there is a plug in the sensing point inlet tubes in the dado panel at station 500A + 7 and in the air grille at station 607.

(b)  
Disconnect inlet tube to the B forward smoke detector from the bulkhead fitting (Detail B, Fig. 501).

(c)  
To measure the differential pressure (method 2), do the steps that follow:
1) Connect the tank to the tubing at the inlet fitting.
2) Connect the vacuum source to the valve on the tank.

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3)  Open the valve on the tank and pull the tank down to a pressure differential of
3.0 inch. 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 inlet fitting. 7) Reconnect the tubing from the sensing inlet to the B forward smoke detector at
the inlet fitting.
(d)  To measure the flow rate (method 1), do the steps that follow: 1) Connect vacuum source with rotameter and gage to the exposed bulkhead fitting. 2) Pull a vacuum of 3 + 0.5 inches of mercury. Observe that the leakage does not
exceed 0.05 scfm.
3) Disconnect the vacuum source and reconnect inlet tubing.

(5)  Test Aft Smoke Detector System Tubing
(a)  
Plug the sensing point inlet tubes in the air grilles at stations 698 and 727B + 12.

(b)  
Plug the sensing point inlet tubes in the air grilles at stations 839 and 879.

(c)  
Remove equipment cooling blower access panel.

(d)  
Disconnect aft 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 aft smoke detection system tubing. 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 in Hg/min. 5) Disconnect the vacuum source from the tank and open the valve. 6) Disconnect the tank from the tubing connection. 7) Reconnect the forward smoke detector tubing 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 aft 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 aft smoke detector tubing. If the leakage was less than specified, you do not have to do the Test A or Test B aft smoke detector tubing.

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(6)  Test A Aft Smoke Detector Tubing
(a)  
Make sure there is a plug in the sensing point inlet tubes in the air grilles at stations 698 and 727B + 12.

(b)  
Disconnect inlet tube to the A aft smoke detector from the bulkhead fitting (Detail B, Fig. 501).
　
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