TEST AFT FUEL TANK AFTER INSTALLATION
At aft end of tank (9), hold fitting (10) with wrench
and disconnect hose (11). Plug hose.
Make sure valve (12) is open and valve (13) is
closed. Connect test setup to fitting (10).
Structural damage to aircraft may
occur if more than 4.0 psi is applied.
Open nitrogen or air supply source (13.1) and
regulate pressure to 3.0 psi. Do not apply more
than 4.0 psi.
Open valve (12) and allow pressure to stabilize
at 3.0 psi. Close valve. Do not apply more than
Wait 15 minutes. Check gage (14). If gage
indicates 3.0 psi, go to step 14. If age indicates
less than 3.0 psi, go to step 8.
CHECK FOR LEAKS OUTSIDE OF TANK
Check for leaks as follows:
Check test setup connections upstream
and downstream of valves (12 and 13), and
gage. Use mixture of soap (E353) and water,
and brush (E85). Allow system to remain
under pressure for 15 minutes. If bubbles
grow in size, connection is leaking. Tighten
leaking connections or replace packings as
needed. Also check all joints, seams, and
cast components. If leak is found, repeat
steps 6 and 7.