Toxic cabin air!

S.T.Aviator

Well-Known Member
Clearing the air up there


By Kara Kostanich - bio | email
Posted by Rachel Leigh - email
(WFLX) - Ever wonder just how clean the air is aboard a commercial jetliner? You may be surprised to learn your favorite airline could be serving up more than just peanuts and soda at 30,000 feet.
For 30 years, Captain John Hoyte had a dream career as an airline pilot. Then, in 2004, an awful moment. He couldn't fly. "I thought I had Alzheimer's. I started to lose my speech. I couldn't relate to other people, had all sorts of other issues -- brain fog, word finding, memory. I thought what was going on? If I fly today I'm going to kill myself, kill passengers, this is not good. I've got to stop. And that was in 2004. I actually walked off the aircraft."
Soon, Hoyte's flying career was over. He was grounded - diagnosed with chronic stress. Then, he was contacted by another grounded pilot, Tristan Lorain, who asked Hoyte to volunteer for a blood test.
The results for Hoyte and 25 other grounded pilots showed the presence of Tricresi lphosphates or TCP.
TCP is used on aircraft as an oil additive to prevent engine wear. It's chemically similar to a pesticide.
Now, every aircraft gets fresh air into the cabin the same way: It's drawn in through the engine and fed through the plane's air conditioning system. Some say the air can be contaminated by leaking oils to form a fine, sometimes toxic, mist. "All the pilots that I've seen are very senior pilots. They're all captains; they've been flying for over 10 years."
In 2006, the United Kingdom Department of Transport commissioned an independent study by Cranfield University to monitor and analyse cabin air aboard Bae 146s, Boeing 757s and Airbus 319s. In all, 100 flights will be monitored. Study results won't be known until next summer.
Five European airlines are allowing inflight monitoring, but no U.S. carriers are participating. So, as a passenger, there are things you can look for.
Professor Clement Furlong at the University of Washington says sometimes you can't see a fume event, but you can often smell it. "So, as far as the passengers are concerned, they'd smell what's been described as a dirty sock smell, a vomit smell, a wet dog smell, and then the symptoms they might experience would be headache, nausea, dizziness, shaking, tingling."
The U.S. Federal Aviation Administration says: "The concerns raised by crew members about fume events are reasonable and are being investigated. The FAA believes that the cabin environment in the vast majority of commercial flights is safe."
To push the airlines into using different air supplies, Hoyte started a Web site devoted to Aerotoxic Syndrome, http://www.aerotoxic.org/.

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I am disappointed it will take so long to get the results back and that the FAA doesn't seem to be publicly pro-active, maybe behind the scenes they are. I hope they do look into it.
 
I've brewed up some toxic air in the cabin quite a few times. I don't see what the big deal is.



Pilot uniform: $160

Headset: $500

Being the first person to step through the open door of a EMB 120 on a warm summer morning after they forgot to service the LAV the night before. . . .priceless.


Seriously though, that is an interesting and scary article. I wonder how long it takes the body to flush that chemical out.

On the bright side, at least we have another excuse to use for firm landings.
 
Clearing the air up there


By Kara Kostanich - bio | email
Posted by Rachel Leigh - email
(WFLX) - Ever wonder just how clean the air is aboard a commercial jetliner? You may be surprised to learn your favorite airline could be serving up more than just peanuts and soda at 30,000 feet.
For 30 years, Captain John Hoyte had a dream career as an airline pilot. Then, in 2004, an awful moment. He couldn't fly. "I thought I had Alzheimer's. I started to lose my speech. I couldn't relate to other people, had all sorts of other issues -- brain fog, word finding, memory. I thought what was going on? If I fly today I'm going to kill myself, kill passengers, this is not good. I've got to stop. And that was in 2004. I actually walked off the aircraft."
Soon, Hoyte's flying career was over. He was grounded - diagnosed with chronic stress. Then, he was contacted by another grounded pilot, Tristan Lorain, who asked Hoyte to volunteer for a blood test.
The results for Hoyte and 25 other grounded pilots showed the presence of Tricresi lphosphates or TCP.
TCP is used on aircraft as an oil additive to prevent engine wear. It's chemically similar to a pesticide.
Now, every aircraft gets fresh air into the cabin the same way: It's drawn in through the engine and fed through the plane's air conditioning system. Some say the air can be contaminated by leaking oils to form a fine, sometimes toxic, mist. "All the pilots that I've seen are very senior pilots. They're all captains; they've been flying for over 10 years."
In 2006, the United Kingdom Department of Transport commissioned an independent study by Cranfield University to monitor and analyse cabin air aboard Bae 146s, Boeing 757s and Airbus 319s. In all, 100 flights will be monitored. Study results won't be known until next summer.
Five European airlines are allowing inflight monitoring, but no U.S. carriers are participating. So, as a passenger, there are things you can look for.
Professor Clement Furlong at the University of Washington says sometimes you can't see a fume event, but you can often smell it. "So, as far as the passengers are concerned, they'd smell what's been described as a dirty sock smell, a vomit smell, a wet dog smell, and then the symptoms they might experience would be headache, nausea, dizziness, shaking, tingling."
The U.S. Federal Aviation Administration says: "The concerns raised by crew members about fume events are reasonable and are being investigated. The FAA believes that the cabin environment in the vast majority of commercial flights is safe."
To push the airlines into using different air supplies, Hoyte started a Web site devoted to Aerotoxic Syndrome, http://www.aerotoxic.org/.

<!--END WNStoryBody-->

CNN International did their weekly Sunday business travel show, dedicated to strictly to pilots and their plight. Pay cuts, low starting pay, requirement to become an airline pilot etc. This guy had a 5 min section giving to him. Basically they are saying that oil additives get mixed with the bleed air, and get through the packs... any rate it was an excellent show.
 
The levels of impairment differ for each person, and often can be mis diagnosed as effects of aging, or other diseases. I'd wait for the study to finish before discarding the notion that toxic chemicals could be bad for you.
 
The MILSPEC (formula) used in a lot of turbine engine oil meets MIL-L-23699.

The one we most commonly used in the T700 (civie CT-7, Saab engine) engines in Blackhawks in the Army was a known neurotoxin.

Ingesting concentrated vapors or swallowing the stuff could readily be lethal through nervous system failure.

Vaporized trace amounts breathed continuously over time could well be a cause of long term health problems, in my opinion.

I know for a fact that the EMB-145 has issues with seals on the bleed air system adding unwanted oil to Pack air supply.

I know for a fact that I can smell MIL-L-23699 when it's present. It's got a distinctive odor and I can't miss it. Even if somebody walked through some on the ramp and then tracked it into the airplane, I can smell it.

I'm forced to wonder, ya know?
 
I've done air quality tests at an engine test facility (as a result of health complaints) and some of the compounds are quite scary. The fact that the oil manufacturer (naming no names) will keep the formula secret despite the liability concerns is also not helpful. The prescriptions for fuel and oil datasheets only cover a few categories of chemicals and you could easily add something outside of that. With the move to biofuels you can produce a whole set of new organic nasties through incomplete combustion - monitoring and more refreshes of air/hour are the key, especially as your body is working harder at 8000ft cabin altitude than normal.

Alex.
 
We already know toxic chemicals are bad for you, hence the "toxic" part.

Thats kinda why I added the "toxic". I just felt like being redundant today. For those of us who are not in turbine equipment, and are not sure how "bleeds" function, they are valves located at various stages of the engine before the combustion chambers, so you are tapping off small amounts of high pressure air before it has fuel added to it.

The notion here, is that there are sometimes small oil leaks, faulty labyrinth seals , or spilled fluids in the engine area where the bleeds may be, allowing the oils to mix with high pressure/temperature air and then be circulated though the cabin. When it finally enters the cabin it will be in the form of fine vapor or smoke. Pretty much just like after a jet deices, and you get that sweet smell like burning anti-freeze from a leaky car.

Our bleed controllers have fine wire filters to keep large objects(dirt,bugs) out, but would only help vaporize the oils.

That being said, I don't think this is a normal problem, and you would be more likely to run into it at a place with shoddy mx... but you never know
 
Just thinking aloud here. How long have the additives been in oil? Over the years with tens of thousands of professional pilots in America, I wonder how many have had these types of symptoms and problems? Certainly not every seasoned professional pilot. What aircraft would be more prone to this problem? No way to answer all of this without a ton of research.
 
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