Check Pilot Detects Fatigue Pattern, Preventing Mid-Flight Crew Incident Over Casablanca

The moment

In March 2024, during a routine line check flight from Casablanca to Marrakech, Amira Mohammed was acting as the senior check pilot. The aircraft, a modern Boeing 737 MAX, was en route with approximately 150 passengers and crew onboard. The flight had commenced smoothly, with standard communications and procedures unfolding as expected. However, as the aircraft entered the cruise phase, Amira began to notice subtle deviations in the cockpit crew’s performance.

While the crew maintained their assigned headings and altitudes, Amira observed inconsistencies in their adherence to checklists, slight delays in response to cockpit alerts, and signs of decreased alertness during routine communication exchanges. These signs, though not overtly alarming, raised a red flag for her trained eye. The aircraft was operating at high altitude, where cognitive performance is critical, and any deterioration in crew alertness can lead to errors with serious safety implications. Amira’s focus sharpened as she continued her monitoring, knowing that such small cues could be early indicators of fatigue or decreasing situational awareness.

Why years of experience made the difference

Amira’s ability to recognize these subtle signs stemmed from her 15 years of professional experience with Royal Moroccan Airlines, where she specialized in crew performance assessments and safety audits. Her extensive background in aviation safety, combined with rigorous Crew Resource Management (CRM) training, had ingrained in her the importance of observing not just what is explicitly said or done, but also what is implied in crew behavior.

Over the years, she had developed a keen sense for micro-behaviours—microexpressions, delayed checklist completion, inconsistent responses to standard calls—that often precede more serious issues like fatigue or distraction. Her familiarity with ICAO fatigue management guidelines further honed her ability to interpret these early warning signs. For example, delayed responses to cockpit alarms or inconsistent checklist adherence are well-documented indicators of fatigue, especially when combined with recent duty hours and scheduling patterns. Amira’s experience taught her to cross-reference these behavioural cues with operational data—such as recent crew duty hours, rest periods, and workload distributions—to assess the risk level accurately.

Her deep understanding of cockpit procedures and human factors meant she recognized the importance of early intervention. Rather than waiting for overt errors or alarms, she relied on her accumulated knowledge to interpret the pattern holistically. This expertise, built over thousands of hours of flight and assessment, allowed her to distinguish between normal variability and signs of significant fatigue that could impair decision-making or reaction times.

What happened next

Acting on her observations, Amira discreetly communicated her concerns to the flight captain during a routine call, suggesting a review of crew alertness levels. She referenced her observations of delayed checklist completion, inconsistent responses to routine calls, and slight micro-sleeps she had detected through cockpit voice recorder data analysis. Recognising the potential for fatigue to impair operational safety, she recommended implementing the airline’s established fatigue management protocols, which included a brief crew rest period.

The captain concurred and coordinated with the cabin crew and flight operations. They arranged for a temporary crew rest, allowing the crew to step away from their duties and recover. During this period, Amira continued to monitor the situation, maintaining communication with the crew and ensuring no further performance issues arose. The rest period lasted approximately 20 minutes, after which the crew was reassessed and cleared to resume their duties.

Following the rest, the crew demonstrated renewed alertness and adherence to procedures. The flight continued safely to Marrakech without incident, and the remaining flight time was uneventful. Amira documented her observations and the steps taken, submitting a detailed report to the airline’s safety management team. This incident was subsequently reviewed in safety audits and incorporated into ongoing training modules to reinforce early fatigue detection and intervention strategies.

What this tells us

This case illustrates how the depth of professional expertise in aviation—particularly in recognizing the nuanced signs of fatigue—serves as a critical safeguard in routine operations. Experienced pilots like Amira, with comprehensive training in crew performance monitoring and human factors, can identify early indicators of risk that automated systems or less seasoned observers might miss. Her proactive intervention, grounded in technical knowledge and operational protocols, prevented a potential in-flight error that could have affected passenger safety. It underscores that in aviation, routine checks are only as safe as the vigilance and judgment of those conducting them, and that expertise remains a fundamental element in maintaining safety at high altitudes.