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A higher altitude at constant mass and Mach number requires...
  • A
    a lower coefficient of lift.
  • B
    a lower angle of attack.
  • C
    a lower coefficient of drag.
  • D
    a higher angle of attack.

Refer to figure.
Climb at a Constant Mach Number in Standard Conditions

During a climb, LSS will be decreasing, as temperature decreases. Therefore, if Mach number is being kept constant the TAS must be decreasing (Mach number = TAS/LSS). During the descent air density decreases TAS is decreasing and IAS also decreases at a greater rate (Dynamic Pressure = 1⁄2 ρ V2).

Lift is a function of the Dynamic Pressure. During climb with a decreasing IAS the aircraft must compensate with a higher angle of attack generate the same amount of Lift.

Lift = 1⁄2 ρ V2 CL

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