(c)
 Remove the access panel 131NW 132PW.

 (d)
 Remove the potable water tank (3000MM) (Ref. TASK 38-11-41-000-001).

 1EFF : ALL 1 28-13-00Page 504 1 1 Aug 01/05 1 1 1CES 1

 Center Tank External Vent System
 Figure 501A/TASK 28-13-00-991-005-B

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 Center Tank External Vent System
 Figure 501B/TASK 28-13-00-991-005

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 (2) Get access:
 (a) Remove the floor panel 241AF (Ref. TASK 53-32-12-000-002). R **ON A/C 062-099, 104-149, 151-199, 204-299, 301-399, 401-499,
 Subtask 28-13-00-010-053-A
 B. Get Access
 NOTE : Do one of the two procedures that follow.

____
 (1)
 Get access:

 (a)
 Put the access platform in position below the applicable access panel.

 (b)
 Open the forward cargo-compartment door 825 (Ref. TASK 52-30-00-860-001).

 (c)
 Remove the access panel 131NW.

 (2)
 Get access:

 (a) Remove the floor panel 241AF (Ref. TASK 53-32-12-000-002).
 **ON A/C ALL

 4. Procedure
_________
 **ON A/C 001-049, 051-061, 101-103, 201-203,

 (Ref. Fig. 501/TASK 28-13-00-991-005-A)
 **ON A/C 062-099, 104-149, 204-299,

 (Ref. Fig. 501A/TASK 28-13-00-991-005-B) R **ON A/C 151-199, 301-399, 401-499,
 (Ref. Fig. 501B/TASK 28-13-00-991-005)
 1EFF : ALL 1 28-13-00Page 507 1 1 Aug 01/05 1 1 1CES 1

R **ON A/C 001-049, 051-061, 101-103, 151-199, 201-203, 301-399, 401-499,

 Subtask 28-13-00-020-052
 A. Preparation for Check
 WARNING : THE TEST EQUIPMENT MUST HAVE A SAFETY SYSTEM TO PREVENT

_______
 ACCIDENTAL PRESSURE INCREASE.

 (1)
 If necessary, remove the check valve (3) as follows:

 (a)
 Remove and discard the lockwire from the three bolts (1).

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

 (c)
 Remove the check valve (3).

 (2)
 Connect a locally made adaptor to the check valve housing (4).

 (3)
 Connect the ground air supply capable of 0.01 bar (0.145 psi) to the adaptor on the check valve housing (4).

 (4)
 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
 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 housing (4), the system and the drain mast.

 (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.

R 1EFF : 001-049, 051-061, 101-103, 151-199, 1 28-13-00Page 508 1201-203, 301-399, 401-499, 1Aug 01/05 1 1 1CES 1

 (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)
 Release the air pressure from the vent and drain system.

 (9) Remove the U-tube pressure gage from the drain mast. R **ON A/C 062-099, 104-149, 204-299,
 Subtask 28-13-00-020-052-A
 A. Preparation for Check WARNING : THE TEST EQUIPMENT MUST HAVE A SAFETY SYSTEM TO PREVENT
_______
 ACCIDENTAL PRESSURE INCREASE.

 (1)
 Connect a locally made adaptor to the end of the check-valve extension hose.
　
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