CTO Fatigue Management & Human Factors 4 — Questions and Answers
Question 1: A controller experiences a microsleep during a low-traffic overnight period. This event is BEST classified as:
- A safety event requiring mandatory reporting and immediate relief (Correct answer)
- A normal physiological occurrence requiring no action
- A minor lapse that can be self-corrected with caffeine
- A medical emergency requiring emergency medical services
Correct answer: A safety event requiring mandatory reporting and immediate relief
Microsleeps represent a complete—if brief—loss of consciousness while on position and must trigger relief, documentation, and reporting.
Question 2: Under the crew resource management (CRM) concept adapted for ATC, 'assertiveness' refers to:
- Speaking up to prevent errors even when it challenges authority (Correct answer)
- Aggressively directing traffic during high-density periods
- Overriding pilot requests without coordination
- Refusing to accept instructions from supervisors
Correct answer: Speaking up to prevent errors even when it challenges authority
Assertiveness in CRM means confidently communicating safety concerns or correcting errors regardless of rank or social pressure.
Question 3: Which caffeine strategy is MOST effective for sustaining ATC alertness during a night shift?
- Consuming moderate amounts in the first half of the shift and avoiding it 4–6 hours before sleep (Correct answer)
- Drinking large amounts of coffee immediately before the shift begins
- Using caffeine continuously throughout the entire shift
- Avoiding all caffeine to prevent tolerance development
Correct answer: Consuming moderate amounts in the first half of the shift and avoiding it 4–6 hours before sleep
Strategic caffeine use early in the shift boosts alertness while preventing sleep disruption afterward due to caffeine's 4–6 hour half-life.
Question 4: The 'normalization of deviance' concept, as applied to ATC fatigue, describes:
- Gradual acceptance of unsafe fatigue levels as routine over time (Correct answer)
- Sudden recognition of a new fatigue-related hazard
- A controller's first experience with shift-work fatigue
- Regulatory approval of modified rest requirements
Correct answer: Gradual acceptance of unsafe fatigue levels as routine over time
Normalization of deviance occurs when controllers and facilities repeatedly tolerate sub-standard rest practices until they are perceived as acceptable.
Question 5: Which metric is the FAA's primary measure used to evaluate fatigue risk in controller scheduling under FRMS principles?
- Predicted sleep duration based on schedule analysis (Correct answer)
- Number of operational errors per fiscal quarter
- Total overtime hours worked per pay period
- Controller self-reported fatigue survey scores
Correct answer: Predicted sleep duration based on schedule analysis
Fatigue Risk Management Systems (FRMS) use biomathematical models that predict sleep opportunity and alertness levels from schedule data.
Question 6: A tower controller on a 'midnight' shift notices the post-lunch dip beginning around 1400 during a day-shift overlap. This dip is caused by:
- A secondary circadian trough that occurs in the early afternoon (Correct answer)
- Digestion diverting blood flow away from the brain
- Reduced radio traffic reducing cognitive stimulation
- Dehydration from inadequate fluid intake during the shift
Correct answer: A secondary circadian trough that occurs in the early afternoon
The post-lunch dip is a genetically programmed circadian trough occurring ~12 hours after the nocturnal nadir, independent of meal timing.
Question 7: When a controller suspects another controller has returned from a break still suffering from sleep inertia, the correct action is to:
- Allow additional recovery time and notify the supervisor before they take position (Correct answer)
- Have the controller take position and monitor their performance remotely
- Require the controller to complete a fatigue self-assessment form first
- Immediately relieve the controller and file an ATSAP report
Correct answer: Allow additional recovery time and notify the supervisor before they take position
Sleep inertia typically dissipates within 15–30 minutes; allowing recovery time and informing a supervisor prevents unsafe staffing of the position.
CTO Fatigue Management & Human Factors 4
A controller experiences a microsleep during a low-traffic overnight period.
This event is BEST classified as: