63 in 100 Indian pilots may be sleepy during dawn landings, safety review warns

The figure describes predicted sleepiness at the final landing of a particular duty, not the condition of every Indian pilot. The review modelled a legally permitted night duty running from 9pm to 7am. It estimated that about 63 in 100 pilots might be sleepy when landing at dawn. This matters because legal compliance does not necessarily match human alertness.

The estimate came from a sleep and body-clock model using legal duty limits and anonymised rosters. It focused on how sleep pressure and circadian timing affect alertness near the end of a night duty. Europe’s comparable figure was 16 in 100, according to the review.

The foundation stressed that the result does not show Indian flying is unsafe or identify unsafe individuals. It is a warning about a type of roster. The proposed response is to change fatigue rules, improve reporting, and independently study pilots’ sleep and alertness.

The estimate was produced using anonymised rosters from 13 pilots. Those rosters were entered into a sleep and body-clock model alongside India’s legal duty limits. The model then forecast how many pilots might be sleepy at the last landing of a specified duty. It did not monitor 63 pilots or examine a group in which unsafe behaviour had been confirmed.

The example duty ran from 9pm to 7am, ending with a dawn landing. The model considered the effects of restricted sleep, time awake, and the body’s overnight drop in alertness. It produced the 63-in-100 prediction for that duty pattern. The review compared this with 16 in 100 for Europe’s day-flight context.

The foundation repeatedly clarified the estimate’s limits. It does not say flying in India is unsafe, or that any pilot was unsafe. Instead, it indicates that a legal roster can create substantial predicted fatigue and supports further independent measurement of sleep and alertness.

India’s rules treat some deep-night work more strictly than daytime work. Duties touching midnight to 6am are limited to 10 hours and two landings. This recognises the difficulty of operating during the body clock’s low-alertness period. However, the review found weaker safeguards for long duties that begin during the day or extend into late evening.

A routine day duty can last 13 hours for any start up to 10:30am, with no additional safeguard based on the start time. A legal day ending just before midnight may include six landings. If one of those landings occurs at 11:30pm, the review predicts sleepiness in 55 to 77 of 100 pilots.

The article also describes the legally permitted maximum night duty as 10 hours, including a 9pm-to-7am example. Five weeks after night rules fully took effect in late 2025, the DGCA suspended them for one large operator.

A duty can follow every roster rule yet still create serious fatigue because hours alone do not measure alertness. The time of day, previous sleep, and total time awake all affect how well a pilot can perform. This matters most when a duty ends during the night or at dawn, when natural alertness is low.

The review compares sleep pressure to a phone battery draining from the moment a person wakes. Sleep recharges it, but a short night leaves the battery partly empty. The body clock also lowers alertness, especially between about 2am and 6am. Repeated short sleep creates a carry-over deficit, or sleep debt.

The article therefore says the fix belongs in the rules, not with pilots alone. Surveys found 71 in 100 pilots had often been too tired for cockpit duty. The foundation urged limits based on duty start time, penalty-free fatigue reporting, and independent sleep and alertness research.

Three forces can reduce alertness before a dawn landing. First, sleep pressure grows from the moment a person wakes. Second, the body clock lowers alertness naturally, reaching its lowest point at about 2am to 6am. Third, earlier short nights can leave accumulated sleep loss that carries into the next duty.

A 9pm-to-7am duty brings these forces together. A pilot may have been awake for many hours, have less restorative sleep available, and reach the cockpit during the body clock’s overnight low. The review compares this to a phone with a flat battery meeting a low tide of alertness. After 17 to 19 hours awake, performance can resemble performance at 0.05% blood alcohol.

That is why dawn landings concern the foundation. Its model predicted 63 in 100 pilots could be sleepy on the example duty. The proposed response is stronger science-based scheduling, fatigue reporting without penalties, and better evidence before exemptions are granted.

Microsleeps are short, involuntary episodes in which a tired person briefly falls asleep or loses normal awareness. They may happen without warning and can prevent someone from processing what is happening. In aviation, even a brief lapse matters because pilots must continuously monitor instruments, communicate, make decisions, and respond to changes.

The article reports that 66 in 100 surveyed Indian pilots had experienced unplanned sleep or microsleeps on duty. It connects this concern with the effects of long wakefulness and sleep loss. Alertness is especially strained during overnight operations, when the body clock is low and sleep pressure is high.

The survey result is not proof that every reported episode caused an accident, and the review did not declare Indian flying unsafe. It is evidence of a fatigue warning signal. The foundation wants penalty-free fatigue reports and an independent study measuring pilot sleep and alertness, rather than relying mainly on roster records.

Regulators are concerned because fatigue appears in both pilot reports and earlier safety investigations. The foundation’s surveys found that 71 in 100 respondents had often been too tired for cockpit duty. Another 66 in 100 reported unplanned sleep or microsleeps while on duty. These findings point to a recurring operational concern, not just a theoretical risk.

Earlier cases provide concrete examples. In the 2010 Mangalore crash, which killed 158 people, the Court of Inquiry found that the captain had slept for most of the recorded cruise. In 2013, investigators found that fatigue contributed to an error in a serious incident in Mumbai. These findings show how sleep and alertness can enter accident and incident investigations.

The review also criticised the evidence behind current rules. It said the DGCA’s 2023 study reviewed rosters and reports but did not use wrist-worn sleep monitors or measure alertness. The foundation urged independent research and stronger fatigue reporting protections.