(2)  
Access Panels
 4504 Aft Cargo Door
 4505 Aft Cargo Door Access Panel
 4506 Aft Cargo Door Access Panel

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737-300/400/500MAINTENANCE MANUAL
 D. Procedure
 S 644-036
 (1)
Lubricate the cables in the cable guard area (Ref 12-26-00/301).

 S 424-037

 (2)  
Install the water pressure tube (Fig. 401).

 S 424-038

 (3)  
Install the hydraulic tubes (Fig. 401).

 S 424-039

 (4)  
Install the aft cable guards (Fig. 401):

 (a)  
Put the guard assembly (1) in its position.

 (b)  
Install the washers on the sleeve of the guard assemblies (1). 1) Connect each set of washers with a screw and a nut.

 (c)  
Put the guard assemblies (2) into the sleeve of the guard assembly (1). 1) Install the three bolts on the guard assembly (2) into the

 slots on the sleeve of the guard assembly (1). 2) Tighten the nut until the bolt does not turn easily.

 (d)  
Put the clamp on the end of the guard assembly (2) between the two rivets. 1) Tighten the clamp.

 (e)  
Install the guard assembly (3) with the slot on the assembly inboard. 1) Tighten the clamps to hold the guard assemblies. 2) Make sure a minimun clearance of 0.10 inch (adjust tubing

 as necessary) is kept between the cable guard and the hydraulic or the water tubings.
 S 944-040
 (5)  
Remove the DO-NOT-OPERATE tags from the control columns.

 S 714-041

 (6)  
Do a test of the cables to make sure there is free movement (Ref 27-31-00/501).

 (7)  
Supply hydraulic power (Ref 29-15-00/201).

 (8)  
Examine the hydraulic tubes for leaks.

 (9)  
Supply pressure to the water tank (Ref 38-41-00/201).

 (10)
 Examine the water pressure tube for leaks.

 S 864-042
 S 794-043
 S 864-044
 S 794-045
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737-300/400/500MAINTENANCE MANUAL
 S 414-046
 (11)
 Install all floor panels, carpets and seats that were removed (Ref 25-22-00/201 and 25-27-15/401).

 S 414-047

 (12)
 Install all cargo compartment lining that was removed (Ref 25-52-65/401).

 S 864-048

 (13)
 Apply new tape on the screws and the damaged tape.

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737-300/400/500MAINTENANCE MANUAL
 FLIGHT CONTROLS HYDRAULIC MODULAR PACKAGE - DESCRIPTION AND OPERATION
_____________________________________________________________________
 1.  General_______
 A.  The two flight controls hydraulic modular packages are manifold assemblies that contain the components which control hydraulic power for the aileron, rudder, elevator, and spoiler control systems. Also low pressure for the aileron, rudder, and elevator control systems is indicated through the modular units. The packages are identical and are located on the forward bulkhead of each main gear wheel well (Fig. 1). System A flight control modular package is in the left wheel well and system B in the right wheel well. Each modular package is a seven port housing with drilled passageways and cavities for attached check valve, compensator cartridge, low pressure warning switch, and two shutoff valves.
 B.  Hydraulic fluid entering the package is routed to the two shutoff valves. When the spoiler valve is in the ON position, fluid is ported out of the modular package to the spoiler control system. When the flight controls valve is in the ON position, fluid is ported to the low pressure warning switch and then out of the package to the aileron, rudder, and elevator control systems. Hydraulic return from the spoiler control system does not enter the modular package, but is returned directly to the hydraulic system return. Hydraulic return from the aileron, rudder, and elevator control systems enters the modular package and is ported through the compensator cartridge and then through the check valve. From this point, fluid is ported out of the modular package to hydraulic system return. With the shutoff valves OFF, the hydraulic pressure is stopped and the shutoff valve cavity is connected to return allowing pressure in the control systems to equalize with return pressure. The aileron, rudder, and elevator return pressure is maintained for gust damping after hydraulic system shutdown by the compensator cartridge. The check valve is incorporated in the modular unit return port to the hydraulic system to prevent reverse flow when hydraulic power is off.
　
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