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 (8)  For the surge tank access panels No. 13, 7101L or 7501R, put the pressure relief valve (if installed) into the open position if it is not open.
 (a)  PRESSURE RELIEF VALVE WITH THE KNOB TYPE OF RESET; Do these steps to open the pressure relief valve:
 NOTE: An open valve has the poppet above the skin on the wing
____ bottom. The manual reset knob and the stem extend below the poppet. When the valve is closed, the outer surface of the poppet is level with the access panel and the skin surface (Fig. 401). The reset knob is also level with the access panel and the skin surface when the valve is closed.
 1)  Put the end of a tube into one of the three pressure holes in the outer surface of the relief valve (Fig. 402).
 NOTE: The usual type of plastic straw that is used to
____ drink a beverage is sufficient for this function.
 2) Hold your fingers tightly on the other two pressure holes. 3) Blow into the tube with sufficient force to open the relief valve.
 NOTE: You can also use an air pressure source with a
____ maximum limit of 1.0 psi to pressurize the pressure hole.
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A 737-300/400/500MAINTENANCE MANUAL
 4) Blow into the tube until the relief valve opens.
 NOTE: The valve makes a sudden click that you can hear
____
 when it opens.

 (b)  PRESSURE RELIEF VALVE WITH THE T-HANDLE TYPE OF RESET; Do these steps to open the pressure relief valve: 1) Put a round rod with a diameter less than 0.415 inch (10.54
 millimeters) into the pressure sense hole in the center of the T-handle. 2) Apply a moderate force to the rod to simulate the pressure differential necessary to open the pressure relief valve.
 NOTE: The valve makes a sudden click that you can hear
____
 when it opens.

 E. Removal Procedure
 S 034-009
 (1)  Remove the mounting screws (Fig. 401).
 (a)  
Hold the clamp ring up to make sure it does not fall.

 (b)  
Remove the mounting screws.

 (c)  
Put the screws in a small container.

 S 034-010
 CAUTION:_______BE CAREFUL WITH THE CLAMP RING AND THE GASKET. YOU CAN CAUSE DAMAGE TO THEM.
 (2)  Remove the clamp ring and the aluminum gasket, and put them in a flat container.
 S 024-011
 CAUTION:_______DO NOT PUSH THE PANEL FROM THE HOLE WITH A SHARP OBJECT. YOU WILL CAUSE DAMAGE TO THE ACCESS PANEL FLANGE AND THE EDGE OF THE HOLE, WHICH MUST SEAL TIGHTLY.
 (3)  Remove the access panel from the fuel tank.
 (a)  Push the access panel up.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (b)  
If the panel does not move up freely, hit it lightly near the edge with a rubber mallet.

 (c)  
Remove the panel from the fuel tank.

 S 494-012
 (4) Install the rubber protector panel around the access panel hole.
 TASK 28-11-11-404-002
 3. Access Panels No. 1 thru 13 Installation (Fig. 401)
________________________________________
 A. General
 (1)  
The No. 14 access panels, 65C38139-1/-2, have a flame arrestor/vent scoop installed on them. The No. 13 access panels 65C15617-2 have a pressure relief valve installed on them.

 (2)  
The No. 14 surge tank access panels with the flame arrestor/vent scoop must be installed with the No. 13 surge tank access panels with the pressure relief valve. If the flame arrestor becomes clogged, and there is no pressure relief valve, the wing can be damaged by the pressure differences.

 B. Consumable Materials
 (1)  
D00020 Anticorrosion Grease - MIL-G-25537 or Equivalent

 (2)  
B00316 Solvent - Aliphatic Naphtha TT-N-95

 (3)  
G00033 Cloth, Lint-free BMS15-5

 C. References
 (1)  
　
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