Aviation English
Aircraft Systems

What is outside air temperature?

outside air temperature The temperature of the air outside the aircraft, used in performance and anti-ice calculations.

Source: ICAO Doc 9432, FAA PCG

How is “outside air temperature” Used in Practice?

Outside Air Temperature at cruise is minus 50 Celsius, anti-ice systems remain on.

Certification Exam Relevance

ICAO Level 4ICAO Level 5ICAO Level 6EASA FCL.055

Who Needs to Know This Term?

  • Pilots
  • Air Traffic Controllers
  • Cabin Crew

Related Aviation English Terms

density altitudeFuel temperaturerunway‑length correction for slope and temperaturestandard‑atmosphere temperature lapse rate

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Frequently Asked Questions

What is outside air temperature?

The temperature of the air outside the aircraft, used in performance and anti-ice calculations.

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