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 2.  Flight Controls and Spoiler Shutoff Valves__________________________________________
 A.  The flight controls shutoff valve and the spoiler shutoff valve are identical. Each valve is mounted on the modular package by four bolts. The valves are electrically-operated from a 28 volt dc source and consist of a motor spool sleeve and cartridge. The cartridge containing the spool and sleeve fits into a cavity in the modular package. The electric motor is splined to a cam which converts rotary motor action into linear spool travel in the sleeve. The valve is equipped with a manual override lever and position indicator. The manual override allows the valve to be positioned with electrical power off. The valve is on when the lever is in position 1, and off when the lever is in position 2. Electrical control of the flight controls and the spoiler shutoff valve is accomplished by the FLT CONTROL and the SPOILER switches on the P5 pilot's forward overhead panel.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE A
SWITCH WARNING LOW PRESSURE 
HOUSING 
VALVE SPOILER SHUTOFF  SHUTOFF VALVE FLIGHT CONTROLS 

MANUAL OVERRIDE 
LEVER 
COMPENSATOR 
CARTRIDGE 

A
Flight Controls Hydraulic Modular Package
Figure 1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 3.  Compensator Cartridge
_____________________
 A.  The hydraulic compensator cartridge maintains aileron, rudder, and elevator return pressure after hydraulic system shutdown. The cartridge compensates for volume changes in the hydraulic fluid due to temperature change or minor fluid loss. The compensator cartridge screws into a cavity in the modular package and consists of a housing with inlet ports and an outlet port, a spring-loaded piston, and a poppet valve. The inlet ports receive fluid from the aileron, rudder, and elevator return. The outlet port is connected through a check valve to the hydraulic system return line. Thermal expansion of hydraulic fluid or operation of the aileron, ruder, or elevator power control packages will cause flow of return fluid to the modular package. This return fluid will displace the spring-loaded piston within the compensator housing. When maximum capacity of the compensator cartridge is reached at 40 to 70 psi, the stops on the piston contact a poppet valve. This will unseat the poppet valve and allow additional fluid to flow to the hydraulic system return. When the hydraulic power is off, or the flight controls shutoff valve is off, the spring-loaded piston will force hydraulic fluid back into the aileron, rudder, and elevator power control packages to compensate for thermal contraction and minor fluid loss. The compensator cartridge is capable of supplying about 8 cubic inches of fluid.
 4.  Low Pressure Warning Switch
___________________________
 A.  The flight controls hydraulic low pressure warning switch is screwed into a cavity in the modular package. The switch input is for aileron, rudder, and elevator hydraulic pressure with low pressure indicated on the forward overhead panel adjacent to the flight controls switch. The low pressure warning light will go off at 1200 |350 psi and will come on within 100 psi below the "light off" pressure. The master warning and caution lights and the flight controls warning light also come on with the flight controls hydraulic low pressure lights (AMM 33-15-00/001).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 FLIGHT CONTROLS MODULAR PACKAGE - REMOVAL/INSTALLATION
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