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The time of useful consciousness in case of a decompression at an altitude of 40 000 ft is…

  • A
    1 minute.
  • B
    12 seconds.
  • C
    30 seconds.
  • D
    5 minutes.

Note: This has been reported as a type-in style question for rapid decompression, especially in UK CAA exams.  

TIME OF USEFUL CONSCIOUSNESS

The time of useful consciousness refers to the time available to individuals to perform their tasks, after they have been deprived of oxygen, but are still aware of their environment and capable of controlling their actions.
It is important for the cabin crew to realize that the time of useful consciousness is different for each individual, and depends on the:

  • Altitude;
  • Individual’s state of health;
  • Amount of activity.

Relationship between Altitude and TUC:

AltitudeTUC
40 000 ft15 – 20 s
35 000 ft30 – 90 s
30 000 ft1 – 2 min
25 000 ft2 – 3 min
20 000 ft30 min

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This question has appeared on the real examination, you can find the related countries below.

  • Austro Control
    5
  • Denmark
    1
  • Poland
    1
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