Beware Frequent Fliers - Aircraft Cabin Air Can be Toxic

Bangalore: Headache, breathing trouble and other unexplained illnesses in frequent fliers just might be the result of breathing toxic fumes circulating in commercial airline cabins, according to a report.
"Aerotoxic Syndrome", the unofficial name now being used to identify symptoms, is caused by breathing air contaminated with oil fumes leaking into aircraft cabins, it says.
The report has been prepared by London-based Aerotoxic Association founded by Former British Aerospace pilot John Hoyte and run by a group of aircrew "whose careers have ended prematurely due to Aerotoxic Syndrome".
The air inside the cockpit and cabin doesn't come from the "fresh air" outside the aircraft as one might think. The outside air is too cold and thin and in order to make it fit for breathing, it must be pressurized, heated, and then circulated to the passengers.
At first, planes were designed with mechanical compressors that produced clean, cabin air. But since the 1950s, most commercial planes have been redesigned to make cabin air - in a less expensive way - by drawing in a compressed supply of it from the plane's engines. Typically, this "bleed air" is mixed with existing cabin air and re-circulated throughout the flight.
In other words, the air in the passenger cabin is a mixture of re-circulated cabin air and fresh air that is compressed in the airplane engine. The problem is that the engine housing from where this air is drawn is often contaminated with toxic fumes from the hot oil used to lubricate the various moving parts of the engine.
The synthetic oil used to lubricate plane engines is specially formulated to endure extreme conditions. It contains all kinds of toxic components, including 'tricresyl phosphate', an organophosphate that is used in pesticides and nerve agents and is known for its neurotoxin properties, the Association says. In addition, bleed air may contain particles of heavy metals from the engines, such as nickel, cadmium and beryllium.
25/06/10 IANS/K.S. Jayaraman/Daijiworld.com

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Categories: Indian Aviation- In General Jun 2010