E. Return Airplane to Normal
(1)
Remove all tools and equipment from tank cavities.
(2)
Install fuel tank access panel (Ref 28-11-11 R/I).
(3)
Open LH center tank fuel boost pump removal valve and install access panel (7201L).
NOTE: ensure that boost pump removal valve is open before installing boost pump access panel.
3. Removal/Installation of APU fuel Feed Line (Wing Center Section)
A. Equipment and Materials
(1) Air pressure source - 40 psi maximum
B. Prepare for Removal
(1)
Connect external electrical power to airplane (Ref 24-22-0 MP).
(2)
Check that all fuel system circuit breakers on P6 panel are closed.
(3)
Defuel tank No. 1 and center tank (Ref 28-23-0 MP).
(4)
Remove external electrical power from airplane (Ref 24-22-0 MP).
(5)
Purge tank No. 1 and center tank (Ref 28-10-0 MP).
WARNING: DO NOT COMPROMISE SAFETY PRECAUTIONS GIVEN FOR PURGING AND ENTERING FUEL TANK.
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C. Remove APU Fuel Feed Line (Wing Center Section)
(1)
Remove bolt and washer attaching APU fuel line support clamp (4 places) (View 1, Fig. 401).
(2)
Place suitable container under connection and disconnect APU fuel line coupling nut at bulkhead union (View 2).
WARNING: TO REDUCE POSSIBLE EXPLOSION HAZARD, DO NOT CONNECT ELECTRICAL POWER TO AIRPLANE WHEN FUEL LINES ARE OPEN (REF 28-10-0 MP).
(3)
Disconnect APU fuel line coupling nut at upper interconnect fitting (View 3). Remove line from center fuel tank cavity.
CAUTION: USE CARE IN MANEUVERING LENGTHS OF TUBING OUT OF CENTER TANK CAVITIES TO AVOID DAMAGE TO TUBING AND SURROUNDINGS.
D. Install APU Fuel Feed Line (Wing Center Section)
(1)
Insert APU fuel line through center tank access panel opening and center tank access openings in spanwise beams.
(2)
Connect APU fuel line coupling nuts (finger-tight). Position line and install support clamps (4 places). Tighten coupling nuts.
(3)
Pressurize APU fuel line and check for leaks (air method)
(a)
Enter tank No. 1 and remove relief valve from tee at 70.85 rib web. Plug port in tee.
(b)
Close APU fuel shutoff valve.
(c)
Enter APU compartment and disconnect fuel feed line at APU fuel filter. Attach air pressure source and gage to fitting.
(d)
Apply 40-psi maximum air pressure and hold for a minimum of 5 minutes.
(e)
Check all fuel line connections and fittings for evidence of external leakage (no
(f)
Release pressure, remove air source and pressure gage, and reconnect fuel feed line at APU fuel filter inlet. Check tube nuts for tightness.
(g)
Enter tank No. 1 and remove plug from tee at 70.85 rib web. Reinstall APU pressure relief valve in tee.
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E. Return Airplane to Normal
(1)
Remove all tools and equipment from tank cavities.
(2)
Install center tank access panel (Ref 28-11-31 R/I).
(3)
Install No. 1 tank access panel (Ref 28-11-11 R/I).
4. Removal/Installation of APU Fuel Feed Line (Flexible)
A. Equipment and Materials
(1)
Air pressure source - 10 psi maximum
(2)
Bonding meter (Ref 20-22-01 I/C)
B. Prepare for Removal
(1)
Remove aisle carpets and floor panel at STA 660 for access to center tank interconnect fitting (Ref Chapter 25, Equipment/Furnishing).
(2)
Remove external electrical power from airplane (Ref 24-22-0 MP).
(3)
Open APU CONT circuit breaker on P6 panel.
C. Remove APU Fuel Feed Line (Flexible)
(1)
Remove bolts attaching flexible shroud to interconnect fitting (View 3, Fig. 401).
(2)
Pull flexible shroud away from center tank interconnect fitting and disconnect flexible fuel line coupling nut.
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WARNING: DO NOT CONNECT ELECTRICAL POWER TO AIRPLANE WHEN FUEL LINES ARE DISCONNECTED (REF 28-10-0, MAINTENANCE PRACTICES).
NOTE: When the flexible fuel line is opened, a small amount of fuel will drain from the center cavity/APU shroud drain mast. A suitable container should be placed under the drain mast.
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