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What is an example of an undesired aircraft state based on Threat and Error Management (TEM) model?

  • A

    A higher approach speed than cleared by ATC.

  • B

    A hard landing resulting in the collapse of the landing gear.

  • C

    An approach attempt to an aerodrome with predicted wind shear.

  • D

    The inadvertent selection of a lower flap setting than recommended by the performance planning tool.

UNDESIRED AIRCRAFT STATES (UAS)

Undesired aircraft states result from ineffective threat or error management. They are defined as:

  • flight crew induced aircraft position or speed deviations, or
  • misapplication of flight controls or
  • incorrect systems configuration

associated with a reduction in the margins of safety.

Examples of undesired aircraft states are:

  1. lining up for the incorrect runway during approach to landing,
  2. exceeding ATC speed restrictions during an approach,
  3. landing long on a short runway requiring maximum braking.

All flight crew MUST employ counter measures in order to keep threats, errors and undesired aircraft states from reducing safety margins in flight operations.

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