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WING FOLD SYSTEMS - 14018_513
VARIABLE RAMP AND BELLMOUTH SYSTEMS

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Figure 12-64.—AC generator drive system. with approved metal closures. Repaired components that are to be installed immediately subsequent to bench testing should be drip-drained, capped, and plugged as neccessary. Plastic plugs are prohibited because of the possibility of plastic chips entering the component and damaging seals or blocking critical passages. The man-hours expended in correcting mal- functions are documented on a VIDS/MAF. When apart is removed and is to be processed through the IMA for repairs, an additional VIDS/MAF is initiated with the appropriate information tilled in and attached to the component for turn-in. Consult the appropriate manuals for proper documentation of the VIDS/MAF. The job is not considered complete until the necessary paperwork has been completed screened, and turned in. GENERATOR DRIVE SYSTEM (HYDRAULICALLY OPERATED) The ac generator drive system shown in figure 12-64 is hydraulically operated by pressure from the hydraulic power system. The AC GEN switch on the copilot’s sub-instrument panel operates the shutoff valve that controls the generator drive system. The system consists of a shutoff valve, a hydraulically driven motor a heat exchanger, a control switch, and a relay. During normal aircraft operation and with the AC GEN switch at OFF, the solenoid-operated shutoff valve is energized (closed). The hydraulic motor lockout relay is also energized. Under this condition, the generator does not operate, since hydraulic pressure is stopped at the shutoff valve. When the AC GEN switch is moved to ON, the hydraulic motor lockout relay and the shutoff valve is de-energized and the valve opens. Hydraulic fluid at 3,000 psi is directed to operate the constant speed variable displacement motor at 8,000 RPM. When the fluid exits from the motor into the return lines, it is routed through a heat exchanger and ram air cooled before returning to the power system reservoir. When ram air is not available on the deck, an electrically driven blower is engaged automatically to provide airflow. Maintenance of the generator drive system normally consists of servicing, testing and checking for proper operation, adjusting, troubleshooting, and removal and installation of system components, flexible line couplings, and other plumbing. Servicing and maintenance procedures and precautions are listed in the MIM and respective (03) overhaul manuals and must be observed at all times to complete the procedures efficiently and safely. Particular attention should be 12-74







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