generators c) APU, external power then engine generators d) Engine generators, external power then APU 2) What is the maximum altitude at which the APU may be started using the batteries only? a) 15, 000 ft b) 30, 000 ft c) 25, 000 ft d) 39, 000 ft 3) Can APU be used for Wing Anti Ice? a) No b) Yes but only below FL150 c) Yes but only when one pack is OFF d) Yes can be used without any restrictions. 4) In normal flight in closed circuit configuration, the avionics ventilation system controls…
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