(a)
Lubricate the four new O-rings with petrolatum.
(b)
Put these coupling components, in this sequence, on the bulkhead body or front spar fitting: 1) coupling nut 2) retaining ring 3) O-ring 4) spacer 5) O-ring.
(c)
Put these components, in this sequence, on the fuel tube ferrule: 1) retaining ring 2) O-ring 3) spacer 4) O-ring.
(d)
Align the bulkhead or front spar fitting and the fuel tube end.
(e)
Keep a distance of 0.15 (|0.05) inch between the tube ends.
(f)
Put the retainer halves together over the gap in the two tubes.
(g)
Inspect the coupling installation to make sure the components are in the correct sequence.
S 432-071
CAUTION:_______DO NOT USE TOOLS TO TIGHTEN THE FUEL LINE FITTINGS. IT CAN CAUSE DAMAGE TO THE FITTING COMPONENTS OR LOOSEN THE ADJACENT FITTINGS.
(4)
Do these steps to tighten the shrouded fuel coupling:
(a)
Slide the O-rings, spacer and retaining ring to the seal position against the retainer.
(b)
Slide the coupling body over the coupling components.
(c)
Manually tighten the coupling body to the coupling nut.
(d)
Tighten the coupling as far as possible by hand.
S 222-081
(5)
Do these steps to inspect the coupling installation.
(a)
Measure the distance between the end of the coupling nut and the end of the coupling body (Fig. 203).
(b)
Make sure the distance is between 2.000 and 2.185 inches.
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747-400 MAINTENANCE MANUAL
(6) S 432-086AIRPLANES WITH A DRAIN LINE ON THE SHROUDED COUPLING; Do these steps to install the drain line to the shrouded fuel coupling. (a) Lubricate a new O-ring with petrolatum. (b) Connect the O-ring, union and drain line to the coupling body.
(7) S 432-082Put a lockwire through the coupling nut to the coupling body.
S 422-092
CAUTION: YOU CANNOT TIGHTEN THE FUEL LINE COUPLING AFTER THE INITIAL
_______ INSTALLATION. YOU MUST INSTALL NEW O-RINGS WHEN YOU TIGHTEN THE FUEL LINE COUPLING AGAIN OR A FUEL LEAK CAN OCCUR.
(8) If you must tighten the fuel line coupling again, disconnect the fuel line coupling and install new O-rings.
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747-400 MAINTENANCE MANUAL
UNION
O-RING
O-RING
A
O-RING COUPLING RETAINER HALF BODY (2 LOCATIONS)
RETAINING RING
SPACER
FUEL TUBE OR BULKHEAD FITTING FUEL TUBE OR
(REF) BULKHEAD FITTING (REF)
RETAINING RING O-RING SPACER O-RING
COUPLING NUT
A
SHROUDED FUEL COUPLING
RETAINER HALF
COUPLING BODY
SPACER
COUPLING NUT SPACER RETAINING RINGRETAINING RING
FERRULE FERRULE
(REF) (REF)
FUEL TUBE OR
BULKHEAD FITTING O-RINGS O-RINGS FUEL TUBE OR
(REF) FWD BULKHEAD FITTING (REF)
A-A
Shrouded Fuel Coupling - Nacelle Strut
Figure 203 (Sheet 1)
F81026
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747-400
MAINTENANCE MANUAL
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