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| Reference: APP Sikorsky? Reference information: Auxiliary Power Plant "Each engine start system has a hydraulic starting motor with a speed switch witch electrically connected to the main engine start valve upon completion of a starting cycle. Power for starting engines is furnished by the engine start hydraulic pump. Since the engine start pump is driven by the accessory gear box, the Auxiliary Power Plant (APP) must be used for all normal ground starts. APP is not required for airborne starts as the main rotor head will drive the accessory gear box. When the engine start valve is energized by depressing the engine starter button, the engine start pump provides 4000 psi hydraulic ... Reference: http://aussiex.org/forum/index.php?app=core&module=attach&se... |
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