Photo © Mike Moores
|Quoting EMBQA (Reply 2):|
This was just asked a few days back... If the weather conditions are right and the humidity is high this will happen. VERY-VERY common in the summer time
|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.
|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.
|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.
|Quoting Zeke (Reply 21):|
Pack flow reduces with engine bleed, on HIGH with APU/ext high press, NORM with engines.
|Quoting Flyabunch (Reply 1):|
I used to call TPA my home airport and I saw this situation a lot in the humid summer months.
|Quoting LongHauler (Reply 23):|
If the selector is left in NORM, however out of Caribbean destinations, we select HI, to quickly cool the cabin.
|Quoting Afay1 (Reply 31):|
I too have only seen it (vapor) on Airbus planes, but have seen actual water dripping from various Soviet aircraft.
|Quoting Afay1 (Reply 31):|
but have seen actual water dripping from various Soviet aircraft
|Quoting Brenintw (Reply 34):|
I've seen this a few times on B744's -- most obviously a full SQ flight from SIN - TPE -- the poor child sitting next to me was getting very wet. I eventually rigged a "tent" from a blanket over his seat so that he wouldn't get wet
|Quoting Zeke (Reply 32):|
The selector has no effect on the ground at all with the APU only running, if you are doing it "to quickly cool the cabin down" (non standard) after engine start it does not change the pack flow either, as it would have been on HIGH with the APU running.
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