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Related Experiment Videos

Hazard potential of ejection with canopy fragmentation

W Y Chiou1, B L Ho, D L Kellogg

  • 1Institute of Aerospace Medicine, Air Force General Hospital, Taipei, Taiwan, Republic of China.

Aviation, Space, and Environmental Medicine
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

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Ejection seat canopy fragmentation poses minimal risk of superficial injury. However, spinal injury remains a concern, with risk varying based on pilot size, highlighting the need for further safety considerations in aircraft escape systems.

Area of Science:

  • Aerospace Engineering
  • Human Factors Engineering
  • Biomechanics

Background:

  • Ejection seat systems are critical for pilot safety in aircraft emergencies.
  • Canopy fragmentation during ejection presents potential hazards to occupants.
  • Assessing injury risks associated with ejection systems is vital for aircrew protection.

Purpose of the Study:

  • To evaluate the hazard potential of ejection with canopy fragmentation.
  • To measure impact loads and noise levels during simulated ejections.
  • To assess the risk of spinal injury using the dynamic response index (DRI).

Main Methods:

  • Conducted 14 horizontal sled tests using tandem ejection seats with anthropometric dummies.
  • Simulated ejections at speeds of 0, 150, 350, and 600 knots.

Related Experiment Videos

  • Fired miniature detonating cords (MDC) in nine tests to fragment the canopy; five tests without MDC firing.
  • Measured neck, knee, and shoulder impact loads; recorded noise levels and acceleration waveforms for DRI calculation.

    • Main Results:

    • Minor visible damage to dummies and equipment occurred, irrespective of MDC firing.
    • MDC firing significantly reduced mean neck loads (from 231 kg to 108 kg, p < 0.05).
    • Mean DRI for smaller dummies was significantly higher than for larger dummies (20.8 vs. 18.05, p < 0.05).
    • Noise levels averaged 162 dB when MDC were fired.

    Conclusions:

    • Superficial injuries from canopy fragmentation are not a significant hazard.
    • Spinal injury risk following ejection may range from 5% to 50%, influenced by pilot size.
    • Further research into mitigating spinal injury risks in ejection scenarios is warranted.