E. Install fueling manifold. Refer to 28-21-22, Fueling Manifold - Removal/Installation.
F. Tighten nut on body or elbow assembly and attach applicable fueling or defueling line.
G. Install fuel tank access panels.
508
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-21-42 Page 401
Fueling Body/Elbow Assembly 500
28-21-42 Figure 401 Feb 15/68
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FUELING SHUTOFF VALVE - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Cleaning solvent - Aliphatic Naphtha TT-N-95 (Ref 20-30-31)
B. Bonding meter (Ref 20-22-01 I/C)
C. Container for fuel
2. Prepare Fueling Shutoff Valve for Removal
A. Open fueling station access door.
B. Check that manual defueling valve is closed.
C. Remove electrical power from airplane.
D. Check that all fueling shutoff valve switches at fueling station are in CLOSE position, then open circuit breakers for fueling shutoff valves and fuel quantity indicators on P6 circuit breaker panel.
E. Remove receptacle cap (Fig. 401).
F. With suitable container under receptacle, press poppet valve in receptacle and allow residual fuel to drain from receptacle and manifold.
G. Install receptacle cap.
H. Disconnect electrical plug from fueling shutoff valve.
I. Disconnect bonding jumper from fueling shutoff valve.
J. Place suitable container under fueling shutoff valve to catch fuel drip.
3. Remove Fueling Shutoff Valve
A. Support fueling shutoff valve and remove bolts attaching valve to fueling manifold.
B. Withdraw fueling shutoff valve from fueling manifold.
508
Feb 20/87 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-21-52 Page 401
Fueling Shutoff Valve Installation 500
28-21-52 Figure 401 Nov 15/69
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
4. Prepare Fueling Shutoff Valve for Installation
A. Clean attaching bolts, washers, and backup rings with naphtha; wipe dry with lint-free cloth.
B. Install washer and backup rings on attaching bolts. Install new O-ring, lightly lubricated with fuel, on attaching bolts.
C. Clean machined surfaces of manifold and shutoff valve with naphtha; wipe dry with lint-free cloth.
D. Install new O-ring, lightly lubricated with fuel, on shutoff valve.
5. Install Fueling Shutoff Valve
A. Lightly lubricate shutoff valve O-ring with fuel and insert valve into manifold. Rotate valve until bolt holes align with holes in manifold.
CAUTION: DO NOT DISLODGE OR PINCH O-RING WHEN ROTATING FUELING VALVE.
B. Lightly lubricate attaching bolt O-ring with fuel and insert into fueling valve. Tighten all bolts equally.
C. Connect bonding jumper to fueling shutoff valve.
D. Connect electrical plug to fueling shutoff valve.
E. Check electrical bond between fueling shutoff valve and airplane structure per 20-22-01, I/C. Resistance shall not exceed 0.0010 ohm.
F. Close fueling station access door.
500
Oct 20/84 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-21-52 Page 403
FUELING FLOAT SWITCH - REMOVAL/INSTALLATION
1. General
A. A float switch is used in each fuel tank to sense full level and terminate fueling during fueling operations. Electrical wiring to the switches is enclosed in conduit with fuel-tight connections. Wiring splices are located close to the respective conduit bulkhead fitting at the wing front spar.
B. There are two types of float switches that can be installed. The Type I float switch (PRE-SB 28-1141) has a red float shell. The Type II float switch (POST-SB 28-1141) has a green float shell. In the tanks No. 1 and No. 2, the Type II float switch must be replaced if the float switch is replaced. In the center tank, the conduit for the Type II float switch contains a liner which must be replaced each time the float switch is replaced. Service Bulletin 28-1141 replaces the Type I float switch with the Type II float switch installation.
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