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Cabin Ozone Question  
User currently offlineTomB From United States of America, joined Nov 2006, 78 posts, RR: 0
Posted (9 months 1 week 4 days 17 hours ago) and read 3405 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...)

William the Pilot

6 replies: All unread, jump to last
 
User currently offline320tech From Turks and Caicos Islands, joined May 2004, 491 posts, RR: 5
Reply 1, posted (9 months 1 week 4 days 7 hours ago) and read 3286 times:

So, umm, what's your question?


The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
User currently offlinewoodreau From United States of America, joined Sep 2001, 978 posts, RR: 6
Reply 2, posted (9 months 1 week 2 days 22 hours ago) and read 3145 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.
User currently offlineIFixPlanes From Germany, joined Feb 2005, 239 posts, RR: 0
Reply 3, posted (9 months 1 week 2 days 1 hour ago) and read 3051 times:

I think i know what the question is.   
My answer:
Yes, ozone smell can caused by nearby TS.



never tell an engineer he is wrong ;-)
User currently offlineArmitageShanks From UK - England, joined Dec 2003, 3552 posts, RR: 15
Reply 4, posted (9 months 1 week 1 day 12 hours ago) and read 2945 times:

I seem to remember this being an issue on Concorde due to the higher altitude it cruised at, no?

User currently offlineDavid L From United Kingdom, joined May 1999, 9483 posts, RR: 42
Reply 5, posted (9 months 2 days 23 hours ago) and read 2440 times:

Quoting ArmitageShanks (Reply 4):
I seem to remember this being an issue on Concorde due to the higher altitude it cruised at, no?

There was a lot of debate about how much effect Concorde had on the ozone layer but I don't remember any discussion about ozone in the cabin. That's not to say it didn't happen.


User currently offlineHAWK21M From India, joined Jan 2001, 31568 posts, RR: 57
Reply 6, posted (8 months 4 weeks 1 day 1 hour ago) and read 2126 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.



Think of the brighter side!
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