27-09-21
ALL ú ú 01 Page 1 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
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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
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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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27-09-21
ALL ú ú 01 Page 3 ú Nov 15/98
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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