ADVANCED AVIATION FORWARD AREA REFUELING SYSTEM MODEL M100A1
REPLACE UNISEX COUPLING FACE SEAL/DUST CAP SEAL
This procedure applies to all AAFARS unisex couplings. All two-inch face seals are the same throughout the system, as are
all three-inch face seals. The seal in the coupling face and the dust cap are identical, and may be interchanged as an
The face plate and dust cap of AAFARS unisex couplings employ a U-ring type seal which is designed to seat with pressure.
The seal is slightly higher than the groove it sits in, so that the top protrudes above the surface. Pressurized fluid enters
beneath this protrusion and expands the seal against the bottom of the seal groove and against the corresponding seal in the
dust cap or other face plate. Special care must be taken during installation to ensure the seal is fully seated in the groove. If it
is not, pressurized fluid will be forced under the seal and the coupling will leak.
Remove seal (1) by hand.
Wipe seal groove clean.
Press seal (1) in groove with a smoothing motion of fingertips. Note that when fully seated, the outer lip of the seal
protrudes slightly above the surface. Ensure the seal is not twisted or kinked.
END OF WORK PACKAGE
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