28-22-81
ALL ú ú 01 Page 603 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
APU FUEL FEED LINE SHROUD - REMOVAL/INSTALLATION
________________________________________________
TASK 28-22-91-004-001
1. APU Fuel Feed Line Shroud Removal_________________________________
A. General
(1) This subject has been relocated to AMM 28-22-36/401.
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28-22-91
ALL ú ú 01 Page 401 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
DEFUELING - DESCRIPTION AND OPERATION
_____________________________________
1. General_______
A. The fuel system is designed to permit complete or partial defueling of one or more tanks, or to permit fuel transfer to other tanks while the airplane is on the ground. To do the defueling or fuel transfer, parts of the pressure fueling, engine fuel feed, and defueling systems are used in combination.
B. The fastest defueling of one or more tanks done if you attach a fuel truck hose nozzle to the fueling station (right wing) receptacle, put the applicable fuel system valves in position, and operate the fuel truck defueling pumps and the respective airplane fuel tank boost pumps. Fuel remaining in the tanks (unusable, trapped) after the pumps stop drawing fuel, is drained into containers when you open the sump drain valves (AMM 28-11-00/001).
2. Defueling Valve (Fig. 1)_______________
A. The defueling valve is manually operated, semisubmerged, slide-type shutoff valve which controls fuel flow from the engine fuel feed line to the pressure fueling receptacle. It is installed on the wing front spar of the right wing. The handle of the defueling valve is such that its access door cannot be closed while the defueling valve is in the open position.
B. The defueling valve has these major assemblies; actuator handle assembly, gate assembly, and port adapter assembly.
(1)
Actuator handle assembly.
(a) The actuator handle assembly consists of an actuating handle, two spring-loaded balls, and a splined output shaft. The splined output shaft supplies a means for the handle to actuate the gate assembly. The two spring-loaded balls drop into detents and lock the handle in the full open or closed position. The actuating handle assembly is bolted to the gate assembly. The gate and actuator handle assembly is replaced as a single unit.
(2)
Gate Assembly
(a) The gate assembly consists of a housing, a splined input shaft, a valve actuating arm, a sliding gate, and gate seals. One end of the valve actuating arm is attached to the splined input shaft. The other end of the arm carries a roller which engages in a slot in the end of the sliding gate. Spring-loaded seals, held in carriers attached to the housing, supply fuel line seals on the two sides of the sliding gate: Other seals, at the housing mounting flange and the splined input shaft, seal the unit against external fuel leaks. The gate assembly is attached to the airplane by nuts installed on double ended bolts that attach the port adapter assembly to the airplane. If you remove the nuts you can remove the gate assembly and not move the port adapter assembly or the fuel lines.
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28-23-00
ALL ú ú 02 Page 1 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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