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Originally Posted by wowpeter
(Post 12219218)
So this is not a problem with CX... it is a fundamental design of the Boeing 747 & 777... It also sometimes happens on Airbus on a very moist and humid day as well...
To boot, most of my recent travel is on CX's 77A or 74A aircraft. Am I the only one not to have been dripped on? |
It's certainly happened to me many times over the years (on CX, KA, and other airlines)
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I've had condensation drip on me on DC-10s, and also seen the vapours on 757s and various 320 models. When you usually get a torrent of water on you is at takeoff when the water moves from wherever it's been pooling and goes back (due to intertia/momentum) and down (gravity).
Does the air cycle machine work by the air being compressed (what's the compressor mechanism, certainly not from the engine bleed offs as that's very hot?) and when it's released into the cabin and expands, it sucks heat from the surrounds? |
Originally Posted by wowpeter
(Post 12219218)
This has nothing to do with it... It doesn't matter what the Air-Cycle machine does... The only thing that the AC might do is cool the air so much that Ice-pellet starting to fly out from the ducts... but this is not the case of the water dripping from the ceiling...
However, YVR Cockroach is correct... it has all got to do with relative humidity... with Hong Kong (and most of South East Asia and most of tropics) being so humid, once the Air-Cond is fire up after Engine start (ground cooling doesn't count as they are not very powerful), the Air-Cycle machine will often cool down the air too quickly... a lot of time with a very warm cabin, it will pump out cold air from the pipe that is only a few degree Celsius, as the system is trying its best to cool the cabin to the preset temperature set at the cockpit / flight attendent panel (hence the ice pellet or the white moist air coming out from the vent)... however air this cold will also cause condensation at the inside of the aircraft fuselage inside the overhead crown space (just above the overhead bins)... once enough condensation occurs, water starts to fall into the cabin between the overhead panels... This is especially worse on Boeing 747 and 777 because the overhead crown space (space between the overhead ceiling and overhead bin and the actual fuselage) is so much bigger than any of the Airbus aircraft... hence there are more moisture trapped... So this is not a problem with CX... it is a fundamental design of the Boeing 747 & 777... It also sometimes happens on Airbus on a very moist and humid day as well... Just my two cents...
Originally Posted by YVR Cockroach
(Post 12221062)
I've had condensation drip on me on DC-10s, and also seen the vapours on 757s and various 320 models. When you usually get a torrent of water on you is at takeoff when the water moves from wherever it's been pooling and goes back (due to intertia/momentum) and down (gravity).
Does the air cycle machine work by the air being compressed (what's the compressor mechanism, certainly not from the engine bleed offs as that's very hot?) and when it's released into the cabin and expands, it sucks heat from the surrounds? The air gets cooled with outside ram air....which causes moisture to condense...the air is then sent through a compressor to separate the water which causes the air to heat up again....so it passes over a second cooling stage. The temperature of the air exiting the pack is a constant....to control the temp of the actual air that enters the cabin it is mixed with outside air to achieve the desired temp. (Was going to upload a schematic of a pack but could not figure out how to. :() |
Originally Posted by kaka
(Post 12212924)
Exactly, you must be asking, WHAT???
Yes. I was on 506/04 and the AC was dripping. all crew knew about it (at least in J) as everyone was stuffing towels while i gave up and moved to the G seat from K. I've also mentioned that in the questionaire (along with other problems) but I dont see anything will be done till i pursue further. I have also complained to the FAs and they were quite apologetic about the incident, but I wonder if CX is going to actively do anything about it. TBH I was on an award trip and tried out JL and BA as well. only if JL had better schedule i'd jump ship anytime. Or in that case, burn miles on JL... sidenote: my gf told me it was also dripping in row 30... what's wrong with these planes!!! |
Originally Posted by Moomba
(Post 12212934)
It has also hailed inside the cabin with small particles of ice falling from above. |
Still on old seats but....
http://www.flickr.com/photos/panism/2577474744/ http://www.flickr.com/photos/panism/2576647105/ http://www.flickr.com/photos/panism/2577478904/ All photos courtesy of panism. |
I've been rained on in a CX 74A in F. But that's the only time I can ever recall it happening.
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I used to get it all the time in the emergency exit seat in Y. It seems to have stopped with the new A330's.
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Come to think of it I got rained on in an SQ A380 a few weeks back
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