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An aircraft descends from FL240 to FL80 for the final approach

Track 070°
Cas 220 kt
OAT ISA -10°C

The average TAS in the descent is?

  • A
    282 kt
  • B
    276 kt
  • C
    228 kt
  • D
    268 kt

The average TAS during a descent is obtain from the CAS at the altitude that corresponds to 1/2 of the altitude difference.

The average TAS during a climb is obtain from the CAS at the altitude that corresponds to 2/3 of the altitude difference.

1/2 x (FL240 - FL080) + FL080 = FL160
Isa temp. FL160 = 15 - 2 x 16 = -17 º C

OAT = -17º - 10º = -27º C

With your flight computer set OAT (-27ºC) over the PA (16 000) and read the TAS (277 kts) in outer scale over CAS (220 kts) in the inner scale.

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