(p)  
Make sure the pressure relief valve opens between -2.50 and -2.75 psig.

 (q)  
Put the pressure to 0 psig.

 (r)  
Remove the vacuum source.

 (s)  
Hold onto the check fixture and remove the check fixture bolts.

 (t)  
Remove the check fixture.

 (u)  
Install the four bolts on the surge tank access door, 543AB or 643AB.

 (v)  
Pull the T-handle down until the pressure relief valve sets again.

 TASK 28-13-04-282-015
 5.  Pressure Relief Valve - Manual Operation (Fig. 201)________________________________________
 A. Access
 (1)  Location Zones
 543 Surge Tank - Rib No. 21 to 23 (Left)
 643 Surge Tank - Rib No. 21 to 23 (Right)

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757
MAINTENANCE MANUAL

 (2)  
Access Panels
 543AB Surge Tank Access Door (Left)
 643AB Surge Tank Access Door (Right)

 B.
Procedure

 S 282-012
 (1)  
Manually operate the pressure relief valve.

 (a)  
Put a screwdriver into the pressure sense hole on the left or right surge tank access door, 543AB or 643AB.

 (b)  
Push up on the screwdriver.

 (c)  
Make sure the pressure relief valve opens.

 NOTE: There is a loud noise and the pressure relief valve
____ moves away from the screwdriver, when the pressure relief valve opens.
 (d)  
Remove the screwdriver from the pressure sense hole.

 (e)  
Pull the T-handle down until the pressure relief valve sets again.

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757 MAINTENANCE MANUAL
 SURGE TANK VENT FLAME ARRESTOR - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General_______
 A.  The vent flame arrestor does not let external flames enter the fuel tank through the vent outlet. Each vent scoop contains one vent flame arrestor. The housing of the vent flame arrestor prevents damage to the vent flame arrestor.
　
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