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Given the following information, calculate the average TAS during the descent:

Cruising altitude: FL130
Target level: FL60
Average CAS during descent: 130 kt
Temperature Conditions: ISA

  • A
    161 kt
  • B
    150 kt
  • C
    115 kt
  • D
    143 kt

Refer to figure.
According to the Learning Objectives the Average TAS used for:

  • Climb problems is the TAS at the altitude 2/3 of the cruising altitude.
  • Descent problems is the TAS at the altitude 1/2 of the descent altitude.

1. The aircaft descends from FL130 to FL60. The 1/2 of the descent altitude is at:

  • [1/2 x (13 000 - 6 000)] ft + 6 000 ft= 9 500 ft.

2. The Outside Air temperature at Pressure Altitude 9 500 ft in ISA conditions is: 15oC - (2oC x 9 500/1 000) = -4oC.

3. Using the airspeed correction window of your nav computer, find the TAS at 9 500 ft.

  • 1. Align Pressure altitude 9 500 feet with actual OAT -4oC.
  • 2. Opposite CAS 130 kt (inner disc), read TAS 150 kt (outer disc).

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