On rare occasions, bleed air used for air conditioning and pressurization can be contaminated by chemicals such as oil or hydraulic fluid. This is known as a fume event. While those chemicals can be irritating, such rare events have not been established to cause long-term harm. Certain neurological and respiratory ill health effects have been linked anecdotally to exposure to bleed air that has been alleged to have been contaminated with toxic levels on commercial and military aircraft. This alleged long-term illness is referred to as Aerotoxic Syndrome by agenda groups , but it is not a medically recognized syndrome. One alleged potential contaminant is tricresyl phosphate. Many lobbying groups have been set up to advocate for research into this alleged hazard. The groups include the Aviation Organophosphate Information Site (AOPIS) (2001), the Global Cabin Air Quality Executive (2006) and the UK-based Aerotoxic Association (2007). Cabin Environment Research is one of many functions of the ACER Group, but their researchers have not yet established any causal relationship. While no scientific evidence to date has found that airliner cabin air has been contaminated to toxic levels (exceeding known safe levels, in ppm, of any dangerous chemical), a court in Australia in March 2010 , found in favor of a former airline flight attendant who claimed she suffered chronic respiratory problems after being exposed to oil fumes on a trip in March 1992.Turner v Eastwest Airlines Limited (2009) at Dust Diseases Tribunal of New South Wales  
On about 1 in 5,000 flights, bleed air used for air conditioning and pressurization can be contaminated by chemicals such as oil or hydraulic fluid. This is known as a fume event. While those chemicals can be irritating, such events have not been established to cause long-term harm. Certain neurological and respiratory ill health effects have been linked anecdotally to exposure to bleed air that has been alleged to have been contaminated with toxic levels on commercial and military aircraft. This alleged long-term illness is referred to as aerotoxic ayndrome , but it is not a medically recognized syndrome. One potential contaminant is tricresyl phosphate. Many lobbying groups have been set up to advocate for research into this hazard, including the Aviation Organophosphate Information Site (AOPIS) (2001), the Global Cabin Air Quality Executive (2006) and the UK-based Aerotoxic Association (2007). Cabin Environment Research is one of many functions of the ACER Group, but their researchers have not yet established any causal relationship. While no scientific evidence to date has found that airliner cabin air has been contaminated to toxic levels (exceeding known safe levels, in ppm, of any dangerous chemical), a court in Australia in March 2010 found in favor of a former airline flight attendant who claimed she suffered chronic respiratory problems after being exposed to oil fumes on a trip in March 1992.Turner v Eastwest Airlines Limited (2009) at Dust Diseases Tribunal of New South Wales Such testing is infrequent due to Boeing's refusal to install air quality sensors in its planes, fearing lawsuits from crew or passengers over fume events, and airlines refused to allow flight attendents to carry air samplers after Congress mandated chemical measurements. The FAA has revoked the medical certificates of several pilots who developed neurological issues after fume events. A judge who awarded workers' compensation to a pilot who had suffered toxic encephalopathy (brain damage) from a fume event condemned the airline industry's obstructionism around fume events.
R
rare occasions,
about 1 in 5,000 flights,
D
rare
R
Aerotoxic Syndrome by agenda groups
aerotoxic ayndrome
D
alleged
R
alleged hazard. The groups include
hazard, including
D
,
A
Such testing is infrequent due to Boeing's refusal to install air quality sensors in its planes, fearing lawsuits from crew or passengers over fume events, and airlines refused to allow flight attendents to carry air samplers after Congress mandated chemical measurements.
A
The FAA has revoked the medical certificates of several pilots who developed neurological issues after fume events. A judge who awarded workers' compensation to a pilot who had suffered toxic encephalopathy (brain damage) from a fume event condemned the airline industry's obstructionism around fume events.