CTO Fatigue Management & Human Factors 5

Question 1

Which error-producing condition in the HFACS framework directly relates to fatigue management failures?

Accepted Answer

Adverse mental states (physiological state)

Answer

HFACS places fatigue under 'adverse mental states' within the Unsafe Acts layer, caused by pre-conditions including inadequate rest.

Question 2

Which physiological sign is the EARLIEST reliable indicator of cumulative fatigue in a controller during a shift?

Accepted Answer

Increased frequency of attention lapses and task-switching errors

Answer

Attention lapses and subtle task-switching errors emerge early in cumulative fatigue before more obvious physical symptoms appear.

Question 3

An air traffic facility implements mandatory 30-minute breaks every 2 hours during overnight shifts. This policy is PRIMARILY intended to:

Accepted Answer

Interrupt monotony and allow brief sleep recovery to sustain alertness

Answer

Scheduled breaks during overnight shifts combat the circadian nadir by allowing short recovery rest and reducing the monotony that accelerates fatigue.

Question 4

The 'Swiss Cheese model' of accident causation is most applicable to ATC fatigue incidents because it shows:

Accepted Answer

Multiple defensive layers must all fail simultaneously for an accident to occur

Answer

The Swiss Cheese model illustrates that accidents result from aligned holes in multiple defensive layers, showing the importance of redundant safeguards beyond individual controller vigilance.

Question 5

A controller transfers to a facility 3 time zones westward. To minimize circadian disruption, the controller should:

Accepted Answer

Gradually shift sleep time earlier by 1–2 hours per day before the move

Answer

Gradually advancing sleep timing before westward travel helps pre-adapt the circadian clock, reducing disruption compared to abrupt schedule changes.

(CTO) Air Traffic Control Tower Operator Certification Practice Test

(CTO) Air Traffic Control Tower Operator Certification Practice Test

CTO Fatigue Management & Human Factors 5