TEST PRESSURE REFUELING SYSTEM FOR LEAKS
Check manifold (14), tee (29), breakaway
fittings (30), check valve (31), and elbows
(32) at forward end of main tank (33). Use
soap and water mixture as in step 17b.
On aircraft with 68 do a check for leaks as
follows. Use soap and water mixture as in
Check vacuum relief hose fitting
(33.1) and nipple (33.2) on bottom of
refueling adapter (33.3). If a leak is
indicated, tighten or replace fitting or
nipple. Replace packing under nipple if
Check vacuum relief valve (33.4) and
vacuum relief hose fitting (33.5). Tighten
fitting or replace line (33.6) if leakage
continues. Proceed as follows if nitrogen
is heard escaping from valve.
Remove pressure from system.
Remove vacuum relief valve (33.4)
Blow low pressure air into screen end
(33.7) of relief valve to dislodge any
dirt that might be present inside.
Apply pressure (air or nitrogen) to
fitting end (33.8) of valve and make
sure valve holds pressure. If leakage
continues, flush valve with solvent
(E162), and perform step c again.
Replace valve if leakage continues.
Install vacuum relief valve (33.4) (Task
10-87.3), and continue leak check of