Human Factors: The Cockpit Reality While the technical malfunction was the trigger, the human element of the crashes revealed critical gaps in system design and crew resource management. Compounded by the high G-forces and aerodynamic forces during the steep dives, the pilots' ability to calmly diagnose the issue and manually trim the aircraft was severely compromised.
Understanding System Interactions and Human Factors in the Boeing 737 Max Crashes
Furthermore, the system was certified under an assumption that a single-point failure would be addressed by pilot training and procedures, a calculation that failed to account for the simultaneous failure of a primary instrument and the physical limitations a pilot faces during an unexpected high-speed dive. The critical flaw lay in its dependence on a single angle-of-attack (AOA) sensor, creating a dangerous vulnerability where a faulty or misaligned sensor could feed incorrect data, triggering an uncommanded nose-down input that was difficult for pilots to override.
Checklist Ambiguity Procedures did not clearly guide pilots to diagnose and counteract the runaway trim. The Core Culprit: Maneuvering Characteristics Augmentation System (MCAS) The central technical element behind both accidents was the Maneuvering Characteristics Augmentation System, a new automated feature introduced with the 737 MAX to address a critical aerodynamic shift.
Understanding System Interactions and Human Factors in the Crashes
In both incidents, pilots were confronted with an unresponsive stabilizer trim system and an overwhelming barrage of alerts, including the activation of the stick shaker—a stall warning that should never have been active in level flight. This led to decisions that masked the novel MCAS system from pilots; it was not prominently featured in the flight manual as a system that could repeatedly command stabilizer trim against pilot input.
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