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December 18, 2020 09:30 pm

How Toxic Fumes Seep Into the Air You Breathe on Planes

An anonymous reader shares an investigative report by LA Times: The plane had begun its descent into Boston. Inside the cockpit, the captain was slumped in his seat. Sitting beside him, copilot Eric Tellmann was starting to pass out. Tellmann managed to strap on his oxygen mask, then grabbed the captain's arm and forced him to follow suit. Reviving slowly, the captain looked at Tellmann through his mask, and his eyes grew wide with fear. A strange smell had permeated the plane that day. Passengers and flight attendants were coughing and wiping teary eyes. The pilots briefly lifted their masks and could still smell the odor as the runway drew nearer. Tellmann and the captain parked the Airbus A319 at the gate. But they had no memory of landing or taxiing Spirit Airlines Flight 708. Tellmann went to the hospital for treatment and spent the next week at home in bed, vomiting and shaking and feeling "like a freight train had run over us," he said in a letter to his union about the July 2015 event. A mysterious smell. Strange symptoms. A trip to the emergency room. The signs were all there: Something had gone seriously wrong with the plane's air supply. The air you breathe on airplanes comes directly from the jet engines. Known as bleed air, it is safe, unless there is a mechanical issue -- a faulty seal, for instance. When that happens, heated jet engine oil can leak into the air supply, potentially releasing toxic gases into the plane. For decades, the airline industry and its regulators have known about these incidents -- called fume events -- and have maintained that they are rare and that the toxic chemical levels are too low to pose serious health risks. But a Times investigation found that vapors from oil and other fluids seep into planes with alarming frequency across all airlines, at times creating chaos and confusion: Flight attendants vomit and pass out. Passengers struggle to breathe. Children get rushed to hospitals. Pilots reach for oxygen masks or gasp for air from opened cockpit windows. Such events are documented in airport paramedic records, NASA safety reports, federal aviation records and other filings reviewed by The Times. Tellmann, the Spirit Airlines pilot, was one of hundreds of airline crew members and passengers who reported being sickened or impaired on flights in recent years. A Times analysis of NASA safety reports from January 2018 to December 2019 identified 362 fume events that airline crew members reported to the agency, with nearly 400 pilots, flight attendants and passengers receiving medical attention. During at least 73 of those flights, pilots used emergency oxygen. Four dozen pilots were described as impaired to the point of being unable to perform their duties. Because they're made voluntarily, the NASA safety reports are the "tip of the iceberg," according to a recent study by a researcher from the National Institute for Occupational Safety and Health.

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