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The Countess of Mar asked Her Majesty's Government: Why filters are not fitted to commercial aircraft to prevent crews and passengers from being exposed to pyrolysis products from synthetic jet engine oils and hydraulic fluids during a contaminated air event. [HL1762]
Lord Davies of Oldham: Filters are not required on commercial aircraft because European airworthiness regulations already require aircraft ventilation systems to be designed to supply air to an acceptable standard, free from harmful or hazardous concentrations of gases or vapours. This is confirmed at the aircraft initial certification and thereafter each commercial aeroplane in the United Kingdom is subject to rigorous scheduled maintenance to ensure that the intended standards are maintained.
To protect the safety of any flight on which an unexpected failure occurs the CAA has directed crews to don their oxygen masks whenever they suspect that the crew air supply has been contaminated.
October 2005
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