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Ozone concentration limiting?
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Written on: 03. 07. 2008 [17:16]
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| Deleted user |
Hi fellow aviators, I've been studying my AOM (Legacy)recently and there are a few pages about ozone concentration limits in there. The table shows the highest flightlevels (dependant on location) at which the aircraft can be safely flown at over a certain period of time. Is this more of a human factor limitation or aircraft limitation? I can't imagine it has anything to do with the aircraft. Anyone knows? |
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Written on: 04. 07. 2008 [15:43]
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daftpuddings
 Board FOregistered since: 13.01.2008
Posts: 26
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Yes, only human factor limiting: Ozone (O3) and "Galactic Radiation" Flight Planning. Most Airliners (except the A310, there must be more types, cost factor...) are equipped with ozone filters. Flight Planning restrictions might be applied as Ozone concentration is not only dependent on alt but of location and season as well, therefore the scheduled routes might differ, again cost driven. I remember having had a hard limit of 6mSv/year (OM-A). If the concentration of exposure of the sum of all flights within a year would exceed this limit, we had to stop in theory. This value set by the airline was so high, of course, you wouldn't reach it if you flew 1000h/yr all on long-range @ high alt and NAT region. This is not the only exposure of course. Take your yearly dose of x-rays into account as well. It is stated that the 5 yearly avarage dose should not exceed 20mSv per year and not with not more than 50mSv in a single year... There is an approximate way to calculate your exposure for a single flight: http://jag.cami.jccbi.gov./cariprofile.asp Unions, if any, might handle the issue. News on this issue from any FAA-Pilot? Symptoms O3. Symptoms of high ozone levels in the cabin include an acrid taste or smell. Individual responses to ozone exposure may vary widely and usually appear in people most physically active during the flight. Moderate constrictions of the chest with some discomfort on deep inhalation, or coughing on deep inhalation, as well as headache and eye irritation are other symptoms of ozone exposure. The highest ozone concentrations are usually experienced at the tropopause level. Ozone Encounters. Use 100% oxygen at the first sign of discomfort and descend to a lower altitude or below the tropopause, if practical. Source: FAA Radiobiology Research Team http://www.faa.gov/education_research/research/med_humanfacs/aeromedical/radiobiology/ Hope this info was useful. e.g. Galactic Radiation Received In Flight (as FAA calles the threat) Flight Summary Date of Flight 05/2008 Origin Code OMDB DUBAI, UNITED ARAB EMIRATES Destination Code KJFK NEW YORK, NY Number of en route altitudes 1 Minutes to 1st en route altitude 30 En route altitude(s) and time(s) Altitude (in feet) Minutes at altitude 37000 840 Minutes descending to touchdown 25 Effective Dose 92.39 microsieverts [This article was edited 4 times, at last 04.07.2008 at 16:14.] |
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Written on: 03. 08. 2008 [06:33]
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| Deleted user |
Thanks. Thats exactly the answer I was looking for. Sorry for late reply, but have been busy flying and was therefore not online very often. bluejet |
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