I bring you a weekly bite-sized chunk of the science behind helicopter human factors and CRM in practice, simplifying the complex and distilling a helicopter related study into a summary of less than 500 words.
TITLE:
Effects of unexpected event urgency and flight scenario familiarity on pilot trainees’ performance and stress responses.
WHAT?
Study exploring how urgency and familiarity with an aircraft and its procedures affect performance, stress, and anxiety when dealing with unexpected events.
WHERE?
Civil Aviation Flight University of China.
WHEN?
Published in 2025.
WHY?
Unexpected events are a major cause of aviation incidents. The study aimed to better understand how time pressure and aircraft familiarity interact, so training be refined for unpredictable, real-world situations.
HOW?
The researchers ran two simulator-based studies with trainee pilots.
In the first, pilots flew a type they were very familiar with from training (single-engine Cessna 172). They experienced two malfunctions: a low-urgency instrument display failure, requiring attention but not immediate action & a high-urgency stall, requiring rapid recovery action.
In the second study, pilots flew a more complex twin-engine aircraft (DA42), which was less familiar to them as they had less experience on type. They faced greater system complexity, during failures, for example, managing asymmetric thrust.
On this type they completed three conditions:
- no failure
- low-urgency (display failure)
- high-urgency engine failure (more complex and demanding scenario).
The researchers measured:
- Psychological stress (State-Trait Anxiety Inventory – a questionnaire that measures how anxious someone feels in the moment).
- Performance (how accurately pilots maintained speed, altitude, and heading).
- Physical stress (heart rate and heart rate variability).
FINDINGS:
- Low-urgency events had little negative impact, and sometimes improved focus.
- High-urgency events significantly reduced performance in both scenarios.
- High-urgency situations increased cognitive load and led to cognitive tunnelling.
- In the less familiar twin-engine scenario, high-urgency events also:
- increased heart rate (stress)
- increased anxiety.
- Familiarity with aircraft type improved performance and reduced stress.
SO WHAT?
This study has reinforces other research which stresses the importance of:
- Exposure to different aircraft types and systems improves mental flexibility and adaptability.
- Training for unpredictable, high-pressure, and time-critical failures.
- Familiarity with aircraft and systems as well reduces stress and improves performance.
- Repeated exposure to unexpected high pressure events improves performance under stress.
Therefore training must include unpredictable and varied failures, not just scripted events and these should increase complexity gradually.
REFERENCE:
Peng, X., Niu, Q., Liang, Y., Luo, Y., Lu, N., & Li, X. (2025). Effects of unexpected event urgency and flight scenario familiarity on pilot trainees’ performance and stress responses. Frontiers in Physiology, 16, 1599122. https://doi.org/10.3389/fphys.2025.1599122
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