{HEAD ~ A multifunction integrated power unit} for {TAIL ~ use} aboard aircraft provides the functions both of an auxiliary power unit and of an emergency power unit while being smaller, lighter, and less expensive than the two units it replaces 
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{ HEAD ~ A multifunction integrated power unit } for { TAIL ~ use } aboard aircraft provides the functions both of an auxiliary power unit and of an emergency power unit while being smaller , lighter , and less expensive than the two units it replaces
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