Chemistry World reported in September that an independent panel of scientists appointed by the government has rejected claims that organophosphate nerve toxins from engine oil fumes are causing ill-health among pilots.
For those interested in knowing more about this topic, here is an interesting video link.
http://video.google.co.uk/videoplay?docid=272139391103460907
Whilst I am myself an airline pilot, I have to confess I have never knowingly encountered such an event. However, I have also never flown the aircraft types rumoured to be the worst offenders. Boeing have actually designed filters for the bleed air – surely recognition of the problem? However most airlines continue to fly without the modification.
Incidentally, the airlines have for years refused to formerly accept that DVT is in any way associated with air travel. I know several pilots who have lost their CAA medicals (and therefore flying licences), due to severe cases of DVT. It was a very very long time before they got any recognition that it may in fact have been the nature of their jobs which made them ill. Perhaps the industry is simply covering up another issue that only affects a minority?