Multiple E-2D Hawkeye Aircrew with Neurocognitive Symptoms During a Single Over-Pressurization Episode

Area of Science:

• Aerospace Medicine
• Naval Aviation Physiology
• Human Factors in Aviation

Background:

• Physiological episodes are an increasing concern in Naval Aviation across various platforms.
• The E-2D Hawkeye aircraft had no previously documented physiological events.
• This case report details a simultaneous physiological event affecting multiple E-2D Hawkeye aircrew.

Observation:

• Five E-2D Hawkeye aircrew were simultaneously exposed to over-pressurization during a routine flight.
• Four of the five aircrew reported immediate hypoxic-like neurocognitive symptoms, including mental slowing, difficulty concentrating, and headache.
• Standard treatment protocols, including 100% oxygen, were administered.

Findings:

• All affected aircrew experienced symptom resolution following treatment with 100% ground-level oxygen.
• The rapid evaluation and treatment adhered to the Physiologic Event Clinical Practice Guidelines.
• A pressure-related mechanism was identified as the most probable cause after excluding other etiologies.

Implications:

• Physiological events, though rare, can occur in multi-crew aircraft like the E-2D Hawkeye.
• Strict adherence to clinical practice guidelines ensures efficient evaluation and timely treatment.
• This incident underscores the need for continued vigilance and protocol reinforcement in naval aviation safety.