TomB From United States of America, joined Nov 2006, 84 posts, RR: 1 Posted (2 years 9 months 3 weeks 6 days 1 hour ago) and read 6206 times:
A commercial pilot friend of mine has question on cabin ozone which he and his fellow pilots cannot answer. Perhaps the experts on the forum can provide an answer. Here is the question.
While flying from Iceland to Dulles, their airplane, a 757, diverted around some thunderstorms in the area, they were at a cruise altitude near 35000 feet.
A powerful electrical smell invaded the cabin, causing some alarm, but no smoke was present. (At this point I figured one of the recirculation fans for the air conditioning system burned up, it happens, they are electrical motors and can fail).
The pilots came on the PA explaining that there was nothing wrong with the plane itself, and what people were smelling was ozone from the electrical activity near the thunderstorms. The smell did go away.
I now have about 7800 hours, have flown in and around just about everything, and have never ever heard of this, not have any of my pilot friends.
I know ozone has a particular smell, but I think most aircraft have ozone scrubbers as part of their air filtration systems ( don't know about the 737...)
woodreau From United States of America, joined Sep 2001, 1181 posts, RR: 7
Reply 2, posted (2 years 9 months 3 weeks 4 days 6 hours ago) and read 5948 times:
I have no idea what your question is either, but for some aircraft there are aircraft limitations as to how long they can spend at certain altitudes due to cabin ozone concentration. The limitations are based on location, altitude, and time of year. The maximum permissible flight time can be as little as 1:00hr or as long as unlimited.
I believe the maximum permissible ozone concentration by FARs is 75 parts per billion and the aircraft limitations are supposed to prevent it from getting above that limit.
Bonus animus sit, ab experientia. Quod salvatum fuerit de malis usu venit judicium.
HAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 6, posted (2 years 9 months 2 weeks 10 hours ago) and read 4929 times:
Quoting TomB (Thread starter): A powerful electrical smell invaded the cabin, causing some alarm, but no smoke was present. (At this point I figured one of the recirculation fans for the air conditioning system burned up, it happens, they are electrical motors and can fail).
Did a cb trip.
Also the B757 has a cataltic convertor in the PACK that will convert ozone to O2........how will it enter the Aircraft.