TM 55-1520-240-23-8
10-118
VENT SYSTEM FLOW TEST
(Continued)
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17.
Check for blockage as follows:
a.
Check vent breakaway fitting (18) at aft end of
tank (17). Replace fitting, if needed. Repeat
step 16.
b.
At main or aft tank only, remove tank forward
access door (Task 10-51 or 10-79). At
forward tank only, remove aft access door
(Task 10-24).
c.
Check vent system hoses (18) and tubes (19)
for kinks. Replace kinked tube or hose.
d.
If hoses (18) or tubes (19) are not kinked,
remove each hose or tube until blockage
source is located. Install hoses or tubes
removed for blockage check.
e.
At main or aft tank only, install forward access
door (Task 10-52 or 10-80). At forward tank
only, install aft access door (Task 10-25).
18.
Repeat step 16.
19.
With valve (5) open, wait 1 minute. Check gage
(15). For forward (17) or aft (20) tanks only, if
gage reads between 1.25 and 2.25 psi go to
step 20. For main tank (21) only, if gage reads
between 1.5 and 2.5 psi, go to step 20. If gage
reading is not within these limits, repeat step 17.
20.
Slowly close valves (4 and 5).
21.
Close valve (6).
22.
Check gage (15). When gage reads 0 psi
remove plug (3).
23.
Disconnect two hoses (7 and 8) from two fittings
(9 and 10).
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