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CNA Explains: How airlines ensure pilots don’t accidentally fall asleep while flying

March 15, 2024
in News
CNA Explains: How airlines ensure pilots don’t accidentally fall asleep while flying
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SINGAPORE: Two pilots from the Batik Air carrier were suspended after they both dozed off mid-flight in January, resulting in the plane veering off-path.

One pilot asked the other if he could rest and had his request granted, but his co-pilot inadvertently fell asleep while in command of the aircraft.

Their simultaneous snooze lasted around 28 minutes during a commercial flight from South East Sulawesi in Indonesia to the capital Jakarta.

While the plane eventually landed safely with no casualties, the incident highlighted the need for better pilot fatigue monitoring systems.

What are the rules around fatigue management?

The International Civil Aviation Organization (ICAO) sets global standards and recommended practices on pilot flight duty and rest, aviation safety consultant Michael Daniel pointed out.

ICAO takes two approaches to fatigue risk management.

The prescriptive approach requires airlines to comply with duty time limits defined by the state or country. Airlines manage fatigue with existing processes that are used for general safety hazards.

The performance-based approach is more specific, allowing airlines to implement their own fatigue risk system tailored to their operations. It must be approved by the state or country.

Both approaches are based on scientific principles, knowledge and operational experience, according to an ICAO guide for airline operators.

For example, they should take into account the need for adequate sleep to restore and maintain all “waking functions” such as alertness, physical and mental performance and mood.

They should also consider how the brain’s circadian clock affects the ability to perform mental and physical work, as well as the ability to fall asleep and stay asleep.

The impact of workload on physical and mental performance degradation, and the safety risk of a “fatigue-impaired” crew member in an operational context should also be taken into account.

Fatigue management is a shared responsibility between individuals, the state or country and service providers or airlines, ICAO noted.

Wait, so are pilots allowed to rest while in the air?

Yes. But there are strict rules governing nap time.

ICAO outlines two types of pilot rest – though not every country permits both.

The first is “controlled rest”, where pilots can sleep in the cockpit.

The second is “bunk rest”, where pilots can sleep in a passenger seat or crew bunk available in a long-haul widebody aircraft, aviation analyst Shukor Yusof told CNA.

The United States, for one, forbids controlled rest. This applies to US airlines operating domestically or abroad, as well as foreign airlines in US airspace.

What are the safeguards for pilots sleeping in cockpits?

Pilots who are allowed controlled rest should follow certain criteria recommended by ICAO before getting some shut-eye.

While only one pilot can take controlled rest at a time, both pilots must have agreed to the rest duration. This should be no longer than 40 minutes, akin to a “power nap”, explained Mr Shukor.

The resting pilot must also pull their seat away from the controls. And once they wake, they cannot immediately take control of the plane, to ensure “full alertness”.

The other pilot must inform cabin crew that one pilot is taking controlled rest. This ensures flight attendants maintain regular contact with the awake pilot, to prevent them from falling asleep.

ICAO’s recommendations for controlled rest also state that autopilot and auto-thrust systems, if available, should be operational. 

Are there different rules for cabin crew?

Pilots and cabin crew have different rest time as they perform separate tasks, said Mr Shukor, whose expertise includes aviation strategy and airline economics.

This may also differ by airline and union.

In Singapore, for example, the in-flight rest plan for pilots on ultra long-range operations should provide for at least two rest periods, of which one should not be less than four hours.

This is according to a 2018 Civil Aviation Authority of Singapore (CAAS) advisory circular on fatigue risk management for such flights. An ultra long-haul flight lasts more than 16 hours, but the flight duty period can last longer.

Cabin crew with a duty period of 19 hours or less should receive at least four hours of in-flight rest, while those with more than 19 hours’ duty should get at least five hours of in-flight rest, the advisory added.

While flight attendants are subject to rest time too, it is “nowhere near as stringent as (what) pilots (get)”, said former airline executive Chow Kok Wah.

This is logical as they face less risk than pilots, he said.

Have there been other incidents of pilots unintentionally falling asleep at the wheel?

The Batik Air pilots were not the first.

In April 2022, two pilots with Italy’s ITA Airways reportedly dozed off mid-flight from New York City to Rome, with 250 passengers onboard.

One pilot had slept during his designated break, while the other unintentionally fell asleep soon after. The latter was eventually sacked.

In August that same year, two pilots of an Ethiopian Airlines flight missed their landing when they fell asleep at their controls. They were jolted awake by an alarm when the autopilot disconnected after the plane overshot the runway without descending, according to reports.

Both pilots were suspended during investigations.

Back in February 2008, two pilots were also suspended when they fell asleep while flying over Hawaii, and missed their destination.

Reports stated that they had been flying towards open ocean for 18 minutes before waking up and returning for a safe landing.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : ChannelNewsAsia – https://www.channelnewsasia.com/world/batik-air-pilots-sleep-cna-explains-rules-fatigue-safeguards-4195606

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