747 5th Contrail
 

Here's an interesting one....

http://www.airliners.net/open.file/208678/L


http://www.airliners.net/open.file/765736/L

both these 747's have a 5th contrail, what do we reckon is the cause? APU? Fuel venting? Water from the galleys?

:8

The second pic shows the 5th trail commencing roughly at the forward drain mast so quite possibly the unquaffed chardy from First Class. :{ :{

Probably just mind suppressing chemicals being released over populated areas as part of a DoD contract...

Any chance it's the moisture from a cabin air outflow?

Another possibility might be bleed air coming from one of the packs.

Nope - it's clearly from the chemtrail outflow valve.....

Both pictures are clearly fakes. No cloud cover over Manchester.

Luckily for me I was wearing my tinfoil helmet those days...

Water separator outflow from one of the packs?

These fifth and third contrails have been discussed lots before, lots of ideas and possibilities, some thoughts are the shape of the fuse and the condensation that it causes.

Why dont people do a search to check for info before posting new threads.

There is so much info on pprune - doesnt take long

Hay Ewe - there's another one "what a sixth contrail?"

Hay Ewe,

I do agree that there's lots of repetition on here but hey it's a forum and that's what they're here for - discussion.

You don't have to read the post if you find it tiresome old chap.

:ok:

RU.

Ooops, I thought I'd let that Vindaloo out quietly. :O Those CIA spy planes are everywhere. :uhoh:

--------------------
"I tell you, we are here on Earth to fart around, and don't let anybody tell you any different." Kurt Vonnegut, Jr.

The first picture could be waste water from the aft drain mast, the second picture clearly shows waste water from the forward drain mast. Both drain masts are electrically heated to prevent freezing.

Clearly? Would a single sink's-worth of waste water really cause a trail 400' long?

Boeing has told us a 5th contrail may be produced with the Packs in HI FLOW.

Rgds.
NSEU

Would a single sink full cause a contrail 400 ' long " ?
Most assuredly. Water tank head pressure decreases at altitude ( think of the number of times there is no water in an upper deck galley in cruise ) and a marginal faucet that depends to some extent on system pressure to shut it off fails to do so, you have a non stop flow down the sink and out the mast.
Not an every day event but flights have definitely depleted a complete water supply via a faucet that fails to shut off and for whatever reason, goes unnoticed.
PS: I think Boeing were fibbing :p