(2)
 Connect the ground air supply capable of 0.01 bar (0.145 psi) to the adaptor on the check-valve extension hose.

 (3)
 Set the ground air supply to a pressure of 0.01 bar (0.1450 psi) (100 mm (3.9370 in.) of water).

 Subtask 28-13-00-720-052-A
 B. Functional Check
 (1) Operate the ground air-supply and supply a pressure of 0.01 bar (0.1450 psi) (100 mm (3.9370 in.) of water) through the vent and drain system. Make sure the air flows freely through the check-valve extension hose, the system and the drain mast.
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 (2)
 Stop the ground air supply.

 (3)
 Install the U-tube pressure gage 300 mm (11.8 in.) on the ventilation pipe outlet of the center tank drain mast.

 (4)
 Operate the ground air supply and slowly pressurize the vent and drain system to 0.01 bar (0.1450 psi) (100 mm (3.9370 in.) of water).

 (5)
 Stop the ground air supply.

 (6)
 Measure the leakage rate. It must not be more than 0.005 bar (0.0725 psi) (50 mm (1.9685 in.) of water) in 30 seconds.

 (7)
 If the leak rate is more than is permitted continue as follows:

 (a)
 Operate the ground air-supply to supply and maintain a pressure of 0.01 bar (0.1450 psi) (100 mm (3.9370 in.) of water) to the vent and drain system.

 (b)
 Use the SPECIAL MATERIALS (Material No. 05-071) to inspect the vapor seal and its interfaces for leaks.

 (c)
 Repair the vapor seal (Ref. TASK 28-13-42-300-001) and/or the pipe connections.

 (d)
 Do the leak test of the center tank/box external ventilating system again.

 (8)
 Carefully remove the U-tube pressure gage from the drain mast. NOTE : Any pressure in the vent and drain system will be released.

____
 **ON A/C ALL

 5. Close-up
________ R **ON A/C 001-049, 051-061, 101-103, 201-203,
 Subtask 28-13-00-410-055
 A. Close Access
 (1)
 Disconnect the ground air-supply connection from the adaptor.

 (2)
 Remove the adaptor from the check valve housing (4).

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 (3)
 If necessary, install the check valve (3) as follows:

 (a)
 Install the check valve (3) in the check valve housing (4).

 (b)
 Install the three bolts (1) and the washers (2).

 (c)
 Safety the bolts (1), as shown, with MISCELLANEOUS (Material No. 19-010).

 (d)
 Manually operate the check valve (3) to make sure it opens and closes correctly.

 (4)
 If applicable, install the potable water tank (3000MM) (Ref. TASK 38-11-41-400-002).

 (5)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (6)
 Make sure that all of the bonding straps are correctly installed and attached (Ref. TASK 20-28-00-912-002), before you install the access panel(s).

 (7)
 If applicable, install the access panel 131NW 132PW.

 (8)
 If applicable, install the floor panel 241AF (Ref. TASK 53-32-12-400-002).

 (9)
 If applicable, close the forward cargo-compartment door (Ref. TASK 52-30-00-860-002).

R **ON A/C 062-099, 104-149, 204-299,
 Subtask 28-13-00-410-055-B
 A. Close Access
 (1)
 Disconnect the ground air-supply connection from the adaptor.

 (2)
 Remove the adaptor from the check-valve extension hose.

 (3)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (4)
 Make sure that all of the bonding straps are correctly installed and attached (Ref. TASK 20-28-00-912-002), before you install the access panel(s).

R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 28-13-00Page 511 1 1 May 01/05 1 1 1CES 1

 (5)
 If applicable, install the access panel 131NW.

 (6)
 If applicable, install the floor panel 241AF (Ref. TASK 53-32-12-400-002).

 (7)
 If applicable, close the forward cargo-compartment door (Ref. TASK 52-30-00-860-002).

R **ON A/C 151-199, 301-399, 401-499,
 Subtask 28-13-00-410-055-A
 A. Close Access
 (1)
 Disconnect the ground air-supply connection from the adaptor.

 (2)
 Remove the adaptor from the check valve housing (4).

 (3)
 If necessary, install the check valve (3) as follows:
　
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