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Pilot performance and workload whilst using an angle of attack system.

Michael A Bromfield1, Thomas Milward2, Samuel B Everett2

  • 1School of Metallurgy & Materials, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom.

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Displaying angle of attack (AoA) in cockpits improves pilot performance and reduces stall events during flight. This enhanced situational awareness offers a safer approach, even with a slight, manageable increase in pilot workload.

Keywords:
Airspeed managementAngle of attack managementLoss of control in flightPilot performanceWorkload

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Area of Science:

  • Aviation Safety
  • Human Factors in Aviation
  • Aerospace Engineering

Background:

  • Loss of control in flight, often due to stalls, is a leading cause of fatal aviation accidents.
  • Airspeed is an unreliable indicator of stall potential; angle of attack (AoA) is a more direct measure.
  • Despite military use for decades, academic research on AoA display effectiveness is limited.

Purpose of the Study:

  • To investigate the impact of displaying angle of attack (AoA) on pilot performance and workload.
  • To assess the effectiveness of AoA displays in reducing stall events and improving approach safety.

Main Methods:

  • A fixed-base flight simulator with a commercial angle of attack (AoA) system was used.
  • Twenty pilots performed normal and emergency procedures during simulated light aircraft approaches.
  • Pilot performance, workload, and stall occurrences were measured with and without AoA display.

Main Results:

  • Pilot performance significantly improved for normal and emergency procedures when AoA was displayed.
  • Fewer stall events were observed when pilots utilized the AoA display.
  • A moderate, tolerable increase in pilot workload was noted during the approach phase.

Conclusions:

  • Angle of attack (AoA) displays enhance pilot situational awareness and decision-making, particularly during critical flight phases.
  • AoA displays can help maintain aircraft within optimal flight envelopes, reducing unstable approaches and stall occurrences.
  • Integrating AoA displays represents a promising advancement for improving overall aviation safety and reducing accidents.