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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

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Flight Controls Hydraulic Modular Package  500 
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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 shutoff valve is accomplished by the FLIGHT CONTROLS switch on the forward overhead panel. Electrical control of the spoiler shutoff valve is accomplished by the SPOILER switch on the forward overhead panel.
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, rudder 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 contacts a poppet valve. This wil1 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 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 out at 1200 +350 psi and will illuminate within 100 psi below the "light out" pressure. The master warning and caution lights and the flight controls warning light also illuminate with the flight controls hydraulic low pressure lights (Ref Chapter 33, Master Warning and Caution Lights).
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FLIGHT CONTROLS HYDRAULIC MODULAR PACKAGE - REMOVAL/INSTALLATION
1.  General
A.  The flight controls hydraulic modular packages for system A and system B are identical. The system A modular package is located in the left main wheel well on the forward bulkhead. The system B modular package is located in the right main wheel well on the forward bulkhead. Each modular package contains a check valve, low pressure warning switch, compensator cartridge, spoiler shutoff valve and flight controls shutoff valve. The flight controls modular package may be replaced as a unit, or any of the components may be replaced individually. This section covers removal/installation of the entire package. Maintenance practices for the individual components are covered in separate subjects.
2.  Remove Modular Package
A.  On panel P6 open the following circuit breakers:
(1)  
FLT CONTR SHUT-OFF VALVES

(2)  
SPOILER SHUT-OFF VALVES

(3)  
IND LIGHTS

B.  If modular package in left wheel well is being removed, depressurize hydraulic system A. If modular package in right wheel well is being removed, depressurize hydraulic system B. Ensure hydraulic reservoirs are depressurized.
C.  Disconnect electrical connectors from motor valves and from low pressure warning switch.  (See figure 401.)
　
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