Flight Duty Time Limitation (FDTL) Rules

• India’s largest Airline, IndiGo, is facing large-scale flight cancellations and delays due to crew shortages following the implementation of the new Flight Duty Time Limitation (FDTL) Rules.

About Flight Duty Time Limitations (FDTL)

• Flight Duty Time Limitations (FDTL) are mandatory safety rules that ensure pilots and cabin crew are adequately rested before flying.
• These rules prevent pilot and cabin crew fatigue to maintain the highest aviation safety standards.
• The FDTL regulations vary from country to country.
• In India, Directorate General of Civil Aviation (DGCA) issues FDTL rules as Civil Aviation Requirements under the Bharatiya Vayuyan Adhiniyam, 2024 and the Aircraft Rules, 1937.
  • The revised FDTL rules were issued in January 2024 and implemented in phases from July 2025 until full enforcement on November 1, 2025.

Key Provisions of the Revised FDTL Rules

Flight Time and Rest Requirements

• Weekly rest increases to 48 continuous hours, including two full nights at the pilot’s home base.
• Flight time limits are fixed at 8 hours daily, 35 hours weekly, 100 hours in 28 Days, and 1,000 hours yearly. Crew members must receive at least 10 hours of rest in any 24-hour window.

Foundation Courses

Night-Related Restrictions

• The “Window of Circadian Low” (WOCL) has been extended by one hour to cover the period from 00:00 to 06:00.
• Pilots may undertake only two consecutive night duties under the revised rules. Also night operations are limited to a maximum of two landings per week.
• Night flight time cannot exceed 8 hours, and night duty time cannot exceed 10 hours.

Need for Stricter FDTL Rules

• Pilot Deaths: On-duty pilot deaths in Nagpur (2023) and Delhi (2024) exposed severe cumulative fatigue and triggered DGCA action.
• Safety Risk: A recent ICAO study showed that 15-20% of fatal aviation accidents involve crew fatigue, prompting tighter regulatory controls.
• Circadian Science: Emerging evidence of reduced pilot alertness between 02:00 and 06:00 led DGCA to extend night duty hours and restrict night landings.
• Global Alignment: India’s earlier 125-hour monthly limit raised concerns about potential international safety downgrades.
• Roster Abuse: DGCA audits found airlines treating maximum duty limits as standard practice by scheduling pilots to fly 35 hours each week.

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