Air Vent Scoop Flame Arrestor Installation 533
28-13-31 Figure 401 May 01/76
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
SURGE TANK FLAME ARRESTOR PRESSURE
RELIEF VALVE -REMOVAL/INSTALLATION
EFFECTIVITY
Airplanes incorporating SB 28-1026 or SB 28-1131
1. General
A. A removal of relief valve may be unnecessary if valve actuation malfunction is suspected. A positive and negative pressure differential check on valve actuation can be performed without removing valve or its access panel from the airplane (Ref 28-13-41, I/C).
2. Equipment and Materials
A. Aliphatic Naphtha -TT-N-95
3. Prepare to Remove Relief Valve
A. Observe all standard purging and fuel tank entry precautions (Ref par. l.C., 28-10-0,
Maintenance Practices).
B. Ensure that there is no residual fuel in surge tank by opening sump drain and draining any remaining fuel into a suitable container.
C. Trip relief valve into open position (if not already open).
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. When valve is closed, outer surface of poppet and reset knob (or T-handle) are flush with access panel and wing lower skin surface (Fig. 401).
(1) On airplanes with reset knob, insert end of tube (a common drinking straw can be used) into one of three pressure sensing holes in outer face of valve (Fig. 402). Hold fingers firmly over remaining two sensing holes and blow forcibly into the tube until valve trips. On airplanes with T-handle, insert a screwdriver into the pressure sense hole in the valve and push up until the valve trips.
WARNING: DO NOT ATTEMPT TO REMOVE ACCESS PANEL WITH RELIEF VALVE IN CLOSED POSITION. VALVE OPENING MECHANISM CONTAINS A POWERFUL, FAST ACTING SPRING WHICH CAN EASILY BE UNLATCHED CAUSING SEVERE INJURY IF FINGERS ARE CAUGHT BETWEEN VALVE PARTS. A LOUD, STARTLING NOISE IS NORMAL WHEN VALVE OPENS.
4. Remove Relief Valve
A. Remove access panel (No. 13) from surge tank (Ref 28-11-11, R/I).
B. Remove eight mounting screws and separate relief valve from access panel (Fig. 402).
C. Remove O-ring seal from flange groove and discard.
May 01/01 28-13-41 Page 401
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K86444 K86446
Surge Tank Flame Arrestor Pressure Relief Valve Position Identification 559
28-13-41 Figure 401 May 01/01
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
533 Surge Tank Flame Arrestor Pressure Relief Valve Installation
May 01/01 Figure 402 28-13-41
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5. Install Relief Valve (Fig. 402)
WARNING: RELIEF VALVE SHOULD BE STORED, HANDLED, AND INSTALLED ONLY WHEN VALVE IS IN THE OPEN (SPRING RELAXED) POSITION AS SEVERE INJURY TO FINGERS CAN RESULT FROM INADVERTENT SPRING RELEASE.
A. If relief valve is found to be in closed position, trip valve open using method in par. 3.C. above. Use care to handle valve on outer housing only if in closed position.
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