Speed regimes – Relationship between AoA, Thrust and Level flight?

[Ref. Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25B Page 5-2]

Straight-and-level  flight may  be  sustained  at  a  wide  range of speeds. The pilot coordinates AOA and thrust in all speed regimes  if the  aircraft  is to  be held  in level  flight.
The speed regimes  of flight  can  be grouped in three  categories:  low-speed flight, cruising flight, and high-speed flight.
  • Low airspeeds – Large  AOA
  • High airspeeds – Low AOA

As the thrust affects the airspeed, the AOA must also vary to maintain level flight.

 

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