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NOTE:  Metal contacting surfaces between flame arrestor and air vent stack flange must be clean to ensure electrical bonding of no higher than 0.010 ohm maximum resistance.
B.  Ensure cells of flame arrestor are unrestricted to airflow; clean, if necessary.
C.  Install flame arrestor on air vent stack flange using a new seal washer under the head of each bolt.
D.  Apply brush coat of BMS 5-26, Type II, Class A sealant material to the flange edge areas of the flame arrestor and air vent stack (Ref 28-11-0, Approved Repairs, except omit requirement to realodize affected surfaces). Coating may overlap fillet seal edge margin by 0.050 inch.
E.  At any time after application of brush coat BMS 5-26, apply BMS 5-26, Type II, Class B fillet
sealant around flange edge as shown in Fig. 401. Use gun or tube for dispensing sealant  (Ref 26-11-0, Approved Repairs).
F.  Install air vent scoop access panel (Ref Removal/Installation).
G.  If disconnected, reconnect battery and remove all warning signs.

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 - Unpublished Work - See title page for details.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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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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