Multifunctional Requirements for a Gearbox Secondary Power System in a Modern Fighter Aircraft and Its Components and Interface Requirements,
KLOECKNER-HUMBOLDT-DEUTZ A G OBERURSEL (GERMANY F R)*
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The basic task of the gearbox in a Secondary Power System SPS of an aircraft is to provide and distribute mechanical energy from the Auxiliary Power Unit APU or from the Main EnginesME to the accessories, i.g. generators, hydraulic pumps and fuel pumps. The complexity as well as the functional facilities increased by incorporating further functional requirements such as main engine start, cross drive operation between redundant systems with the associated control devices, including oil supply to the accessories into the gearbox oil system. The Tornado-SPS is one of the most modern systems flying today. Inspite of its high complexity, as a result of the extreme functional requirements, the system shows a high reliability although the aircraft has been inservice for a few years only. The experience gained with major components like gearbox housing, gearing, freewheel clutches, dry friction clutches and components of the oil system will be reported. Some aspects from this experience will be given for the design of gearboxes for future secondary power systems.