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Given the following information, what is the TAS for an aircraft flying at FL230?

OAT: -31°C
IAS/CAS: 210 kt

  • A
    299 kt
  • B
    284 kt
  • C
    210 kt
  • D
    278 kt
Refer to figure.
For this question your Flight/Nav computer is required to apply the following steps:
  • In the airspeed window, align the OAT: -31°C with the altitude 23 000 ft (23).
  • Now against the given IAS/CAS: 210 kt (21) on the inner scale, read a TAS of 303 kt, which is very close to 299 kt.

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