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Which cabin pressure do commercial aircraft typically maintain?

  • A.A pressure that varies with the cruising altitude, remaining a fixed fraction of the outside pressure
  • B.Equivalent to about 2400 metres altitude
  • C.Sea level pressure, so that passengers experience no change at all during the whole of the flight above
  • D.Equivalent to about 5000 metres

Answer: B

Cabins are pressurised to about 750 hectopascals, equivalent to 2400 metres, which is a compromise between passenger comfort and the structural stress of the pressure differential. Newer composite airframes maintain a lower cabin altitude. Full sea level pressurisation would require a much stronger and heavier fuselage for no proportionate benefit.

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