SURGE TANK FLAME ARRESTOR PRESSURE RELIEF VALVE -INSPECTION CHECK
EFFECTIVITY
AIRPLANES POST-SB 28-1026 or POST-SB 28-1131
1. General
A. The relief valve, if actuated to the open position, will bypass the normal air vent scoop in the fuel vent system. Once open, from an abnormal positive or negative pressure differential, the valve must be manually closed. The actuation pressure check is made with the valve installed in the airplane, using special equipment attached to the external skin of the airplane.
2. Close the Relief Valve Using Manual Reset
A. Check for open relief valve by examining poppet position at center of elliptical access panel adjacent to air vent scoop at each wing tip.
NOTE: An open valve will have poppet positioned above the wing lower skin surface with the manual reset knob (or T-handle) and stem protruding down below poppet.
B. Manually reset relief valve poppet to closed position (Fig. 601).
(1)
Grasp manual reset knob (or T-handle) and pull downward until outer face of poppet is flush with skin.
(2)
Relax downward pull gradually to ensure poppet is latched in closed position then continue to relax pull gradually until return spring retracts reset knob (or T-handle) into recess.
NOTE: Outer face of reset knob (or T-handle) and poppet should all be flush with wing lower skin in final closed position.
3. Relief Valve Actuation Pressure Check (Fig. 602)
A. Equipment and Materials
(1)
Test Fixture, Pressure Relief Valve -F80166-1
(2)
Leak Tracing Device -F71329
(3)
Pressure monitoring device -0-5 psig (0-138 inches of water/0-34.5 kPa) Use one of these or equivalent:
(a)
Water Safety Relief Manometer -F72951-1 (recommended)
(b)
DigiMano 2000
Available from:
Netech Corporation
60 Bethpage Drive
Hicksville, NY 11801, USA
(4)
Air supply - 0-10 psig (0-68.9 kPa)
B. Prepare for Pressure Check
(1) Make sure the relief valve is in the closed position. Manually reset to the closed position, if open (Ref par. 2.).
May 01/03 28-13-41 Page 601
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K08117 K15531
Surge Tank Flame Arrestor Pressure Relief Valve Manual Reset 533
28-13-41 Figure 601 May 01/01
Page 602
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
533 Surge Tank Flame Arrestor Pressure Relief Valve
May 01/99 Actuation Pressure Check 28-13-41
Figure 602 Page 603
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(2) Install the F80166 test fixture on the relief valve.
(a)
Remove, at 90-degree intervals, four of the eight mounting screws that attach the relief valve to the surge tank access panel.
(b)
Put the test fixture against the relief valve with MS29513-154 0-ring seal installed in the test fixture flange groove.
NOTE: MS29513-154 O-ring seal is part of test fixture assembly.
(c)
Attach the test fixture to the relief valve using four MS16998-31 screws in place of the regular mounting screws removed in 3.B.(2)(a).
NOTE: MS16998-31 screws are part of test fixture assembly.
(3)
Attach hose of the pressure gage or water safety relief manometer to the adapter fitting at bottom of the F80166-1 test fixture.
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