S 715-027
(11)
Make sure the valve override handle moves to the open position.
S 715-018
(12)
Set the APU master switch to the OFF position.
(a) Make sure the valve override handle moves to the CLOSED position.
S 865-019
(13) Set the battery switch to the OFF position.
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A
737-300/400/500MAINTENANCE MANUAL
APU FUEL FEED LINE SHROUD - REMOVAL/INSTALLATION
________________________________________________
1. General_______
A. This procedure has four tasks:
(1)
A task to remove the main shroud for the APU fuel-feed line
(2)
A task to install the main shroud for the APU fuel-feed line
(3)
A task to remove the aft shroud for the APU fuel-feed line
(4)
A task to install the aft shroud for the APU fuel-feed line.
(a) The APU fuel-feed line shroud is referred to as the APU shroud.
B. The APU shroud has this routing:
(1)
It starts at the position where the fuel line goes out of the skin on the top of the center wing section.
(2)
It goes to the fuel adapter for the APU shroud.
C. To make the removal procedure easier, the APU shroud is divided into two parts. The part that goes from the top of the wing section to the forward side of the pressure bulkhead is referred to as the main shroud. The part that goes from the aft side of the pressure bulkhead to the fuel adapter is referred to as the aft shroud.
TASK 28-22-36-004-001
2. Main APU Fuel Feed Line Shroud Removal______________________________________
A. References
(1)
12-31-00/201, Access Doors and Panels
(2)
24-22-00/201, Manual Control
(3)
25-27-15/401, Carpets
(4)
28-22-81/401, APU Fuel Feed Line
(5)
53-21-00/401, Passenger Cabin Floors
B. Access
(1)
Location Zones
108 Aft Half of Cabin
218 Aft Cargo Compartment
220 Aft Cargo Compartment Equipment Bay
(2)
Access Panel
3804 APU Cowl Door
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A
737-300/400/500MAINTENANCE MANUAL
C. Procedure
S 014-040
(1) Get the access to the fitting and the parts that attach the main shroud.
NOTE: You can get access to the five shroud clamps between
____ Station 947 and Station 1016 by a different procedure. You can remove the access panels in the aft wall of the aft cargo compartment.
(a)
Remove the aisle carpets (Ref 25-27-15/401) between Station 616 and Station 1016.
(b)
Remove the floor panels (Ref 53-21-00/401) between Station 616 and Station 1016.
S 864-002
(2) Remove the electrical power from the airplane (Ref 24-22-00/201).
S 024-041
WARNING: DO NOT CONNECT THE ELECTRICAL POWER TO THE AIRPLANE WHEN THE
_______ FUEL LINES ARE DISCONNECTED. CAREFULLY DO ALL OF THE SAFETY PRECAUTIONS FOR PROCEDURES WITH OPEN FUEL TANKS. AN EXPLOSION AND BAD INJURIES TO PERSONS CAN OCCUR.
(3) Remove the main shroud part of the fuel line.
NOTE: If you are scheduled to remove the flexible fuel-feed line,
____ refer to the applicable procedure (Ref 28-22-81/401).
(a) AIRPLANES WITH BELLOWS ON THE APU SHROUD; Do these steps to disconnect the fuel line: 1) Remove the bolts that attach the flexible shroud flange to
the center tank fitting. 2) Put a container below the drain mast for the APU shroud to catch fuel. 3) Pull the flexible shroud away from the center tank fitting.
NOTE: When you open the flexible fuel line, a small
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