TM 55-1520-240-23-8
10-96
INSTALL DUAL CHECK VALVE FITTING
(Continued)
10-96
Do not allow dual check valve
breakaway fitting (1) to turn within its
mounting when connecting fuel and
pressure lines. Otherwise valve can
fail and cause fuel blockage.
NOTE
Procedure is same to install No. 1 or
No. 2 system dual check valve fittings.
No. 2 system fitting is shown here.
1.
Install four-bolt flange (2) of dual check valve
breakaway fitting (1) in tank access door (3).
Check that ends of fitting are in position to accept
fuel and pressure lines without turning fitting in
its mounting.
2.
Remove caps from fitting (1) ends.
3.
Install dual check valve breakaway fitting (1) in
tank access door (3). Use four screws (4) and
washers (5).
4.
Remove plugs from fuel hose (6 and 7) fittings.
Install conical seals (8 and 9) in hose fittings.
Hold dual check valve breakaway fitting (1) with
a strap wrench and connect hoses.
5.
Remove plug from pressure hose (10) fitting.
Hold dual clock valve breakaway fitting (1) with a
strap wrench and connect hose.
6.
Remove plug from fuel hose (12) fitting (inside
aft fuel tank). Hold dual check valve breakaway
fitting (1) with a strap wrench and connect hose.
INSPECT
FOLLOW-ON MAINTENANCE:
Refuel aircraft (Task 1-51).
Bleed fuel system (Task 10-121).
Perform operational check of fuel system (TM
55-1520-240-T).
Check for leaks (Task 10-4).
Close aft intertank access door (Task 2-188).
END OF TASK
10-454
