Flyabunch From United States of America, joined Nov 2004, 519 posts, RR: 4
Reply 1, posted (9 years 3 weeks 2 days 20 hours ago) and read 6290 times:
This phenomenon happens quite frequently in humid climates. The outside moisture enters the plane thru the open doorway and the moisture is picked up by the air conditioning and blown around. It usually freaks out people that have not seen it. There is actually enough moisture that when you put your hand in the air stream, it will get wet.
The moisture usually dissipates after the doors are closed. If there is a real excess of moisture, sometimes it doesn't go away until after takeoff.
I used to call TPA my home airport and I saw this situation a lot in the humid summer months.
SkyexRamper From , joined Dec 1969, posts, RR:
Reply 6, posted (9 years 3 weeks 2 days 19 hours ago) and read 6140 times:
There have been many times when the F/A on our jets would open the door and the "fog" comes pouring down the steps, kind of freaky to see. Not to mention on the hot days you can see the a/c flowing up the cockpit windows.
Nomadic From United States of America, joined Apr 2004, 462 posts, RR: 0
Reply 8, posted (9 years 3 weeks 2 days 16 hours ago) and read 5973 times:
I have seen it once in a while on various aircraft but it happened EVERY time I have flown on a Pulkovo Aviation IL-86.
Moscow & St. Petersburg can get very humid during the summer but I am beginning to think it might have more to do with the actual ventilation system.
SP90 From United States of America, joined May 2006, 388 posts, RR: 0
Reply 13, posted (9 years 3 weeks 2 days 14 hours ago) and read 5754 times:
Happens to me a lot when I turn on the a/c in my car during the hot and humid days. I see white smoke blowing out of the vents. Its almost like the vents are the engine exhaust ports and their pulling contrails.
Lucky42 From , joined Dec 1969, posts, RR:
Reply 16, posted (9 years 3 weeks 2 days 11 hours ago) and read 5638 times:
Quoting Zeke (Reply 12): My mother tells a story of a SEA-HNL flight on Pan Am where
"It rained. I'm telling you it rained" Uh huh, ok ma, whatever!
Took me a few years to believe her.
Anyone who has flown on an NW DC-9 a lot and were in the last rows in the summer will probably tell you they got wet....water would collect on hot humid days and when the a/c rotated they would get a waterfall effect in the last rows coming out of the PSU's. After NW went to the new interiors in the DC-9 the fasten seat belt sign and F/A call button were all controlled in each row were controlled with a curcuit board so when this would get wet would would see the call chime and reading lights in a particular row would go on and off....
Lufthansi From Germany, joined May 2002, 454 posts, RR: 2
Reply 19, posted (9 years 3 weeks 1 day 23 hours ago) and read 5340 times:
In TAM's A330s I got ice-cubes served through the instrument panel outlets of the air conditioning. That's cool! But it only works when it's very hot at CDG and when the pack selector switches are in high position and temp. selectors to cold.
MD80fanatic From United States of America, joined Apr 2004, 2792 posts, RR: 9
Reply 20, posted (9 years 3 weeks 1 day 23 hours ago) and read 5329 times:
That is water vapour, and it's inside the cabin at all times (even if in the desert). Assuming normal flight pressures...when this vapour is cooled by the air conditioning vent it will momentarily condense into a liquid that is visible. Once the now-liquid water warms again, past the air conditioning stream, it will re-evaporate into it's normal invisible gaseous state.
Zeke From Hong Kong, joined Dec 2006, 10136 posts, RR: 76
Reply 21, posted (9 years 3 weeks 1 day 23 hours ago) and read 5311 times:
Quoting LongHauler (Reply 18): Take it even further .... after airborne, as the packs achieve full efficiency with engine bleed source as opposed to APU bleed source, and it starts SNOWING in the cabin.
I see it alot after departure from BGI in an A319.
Pack flow reduces with engine bleed, on HIGH with APU/ext high press, NORM with engines.
Quoting MD80fanatic (Reply 20): That is water vapour, and it's inside the cabin at all times (even if in the desert). Assuming normal flight pressures...when this vapour is cooled by the air conditioning vent it will momentarily condense into a liquid that is visible. Once the now-liquid water warms again, past the air conditioning stream, it will re-evaporate into it's normal invisible gaseous state.
That will depend on the relative humudity and temperature split from dew point.
We are addicted to our thoughts. We cannot change anything if we cannot change our thinking – Santosh Kalwar
IDISA From Italy, joined Jun 2004, 265 posts, RR: 0
Reply 22, posted (9 years 3 weeks 1 day 22 hours ago) and read 5287 times:
This phenomenon had happened to me once on a HAV-FCO flight, while at the gate, doors closed and pushback started. Some clouds of vapor started soaring and I remember an old lady sat next to me being freaking out and asked me what was happening...