How new DGCA rules put human limits at centre of air safety, PgII

Key Highlights:

• The DGCA's new fatigue and rest norms aim to minimize fatigue among aviation personnel following recent disruptions in India's aviation sector.
• The new rules increase the weekly rest period from 36 to 48 hours, reduce permitted night landings from six to two, and expand the definition of night duty.
• These modifications are similar to practices in the U.S. and Europe, where limits on hours and mandatory rest have reduced fatigue-related incidents.
• Fatigue has been a recurring factor in global air safety investigations, highlighting the importance of these regulations.

Detailed Insights:

• The DGCA's new framework addresses the stresses imposed during flight, such as lower atmospheric pressure and the physiological effects of acceleration on the body.
• Pilots working across time zones and overnight schedules destabilize the body’s circadian rhythm, leading to sleep debt and impaired cognitive function.
• Immediate physiological effects of disrupted circadian rhythm include slower reaction time, impaired judgment, microsleeping, and emotional irritability.
• Chronic circadian misalignment is associated with higher blood pressure, metabolic disturbances, lower immunity, mood disorders, and higher cardiovascular risk.
• Managing operational risks due to fatigue remains uneven and under-regulated in sectors beyond aviation, such as hospitals, railways, and trucking.
• The DGCA’s rules are commendable for prioritizing human physiology in aviation policy, setting a precedent for other sectors.

Scientific/Technical Concepts Involved:

• Circadian Rhythm: The body's internal clock that regulates sleep-wake cycles and other physiological processes.
• Melatonin: A hormone that regulates sleep and is affected by disruptions to the circadian rhythm.
• Microsleeping: Brief, involuntary periods of sleep that can occur when a person is fatigued.