Efficiency is reduced because the propeller exerts less force at high density altitudes than at low density altitudes. Efficiency is reduced due to the increased force of the propeller in the thinner air. Efficiency is increased due to less friction ...
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increased endurance. an inflight fire. a change in aircraft center of gravity.
Involves public aircraft or air carrier operations. Can be safely conducted under the terms of that certificate of waiver. Will be conducted outside of the United States.