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ALTERNATING CURRENT (AC) SYSTEMS
Carrier aircraft servicing system

Airman - Aviation theories and other practices
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AIRBORNE AUXILIARY POWER UNITS (APU) Most larger aircraft use APUs. These power units furnish electrical power when engine-driven generators are not operating or when external power is not available. The power output from the APU supplies a constant voltage at a constant frequency. The APU does not depend on engine rpm. Most units use a gas turbine (fig. 7-3) to drive the generator. The gas turbine provides compressed air for air conditioning and pneumatic engine starting. This makes the aircraft independent of the need for ground power units to carry out its mission. CARRIER AIRCRAFT ELECTRICAL POWER SERVICING SYSTEM The deck-edge electrical power system on aircraft carriers provides servicing power to aircraft. Twenty-eight volt dc power is supplied by rectified ac or by motor-generators. Ac generators usually supply the 400-hertz, three-phase, ac servicing voltage. Figure 7-4 shows an electrical power service system found on modern carriers. Power is supplied by service outlets located at the edge of the flight deck or from recesses in the flight deck. Additionally, receptacles are located throughout the hanger bay. All systems have standard remote control switches, service outlet boxes, and 7-4 APU GENERATOR MOUNTING PAD ANF0703 Figure 7-3.—Gas turbine power plant unit.







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