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Dash 8 Question  
User currently offlineViflyer From US Virgin Islands, joined May 1999, 500 posts, RR: 0
Posted (11 years 4 weeks 1 day 23 hours ago) and read 1999 times:


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Quite a few times I've sat at the end of D concoure at LGA watching planes go by and I've noticed on the Dash 8's that there is a small pipe sticking out of the rear the engine housing which a white smoke or steam seems to be coming out of during taxi (unfortunately you can't see it at all in this picture). I just was wondering if someone could shed some light on what it's coming from and what is causing it.

thanks


I reject your reality and subsitute my own
9 replies: All unread, jump to last
 
User currently offlineDash8tech From United States of America, joined Jul 1999, 732 posts, RR: 5
Reply 1, posted (11 years 4 weeks 1 day 18 hours ago) and read 1933 times:

That is a fuel vent and what you're seeing is some fuel venting. Frequently on startup, taxi and sometimes on landing.

Look close you can see the vent here...


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Cheers!


User currently offlineScootertrash From United States of America, joined Aug 2001, 569 posts, RR: 9
Reply 2, posted (11 years 4 weeks 1 day ago) and read 1847 times:

I return after a long absence and here is a Dash 8 question! I am so pleased!

Dash8Tech is of course correct, that is a fuel vent. At my place, we call it the "afterburner."


User currently offlineYikes! From Canada, joined Oct 2001, 284 posts, RR: 1
Reply 3, posted (11 years 4 weeks 23 hours ago) and read 1839 times:

Umm, folks, that's the oil breather tube.

User currently offlineScootertrash From United States of America, joined Aug 2001, 569 posts, RR: 9
Reply 4, posted (11 years 4 weeks 21 hours ago) and read 1823 times:

Seems we have some disagreement here. In training (which I admit was a while ago) we were told that was a fuel vent... Then again it was a pilot doing the talking, so ya never know.

Next time I preflight an -8 (it'll be a few weeks until I get my medical back) I will look harder at the aft end of the nacels. If memory serves me correctly, there are two tubes back there, one small and narrow and one wide and unpainted. The wide one is where the smoke comes from.


User currently offlineYikes! From Canada, joined Oct 2001, 284 posts, RR: 1
Reply 5, posted (11 years 4 weeks 20 hours ago) and read 1811 times:

The wide one (about an inch and a half in diameter) is an oil breather tube. Peculiar to the deHavilland series of aircraft and a source of perennial oil staining of the aft nacelles of Twin Otters, Dash 7's & 8's.

Any fuel that is purged during engine shutdown goes into a collection cannister which vents elsewhere during flight.

The little tube is at 90 degrees to the airflow and is a pneumatic trigger mechanism once sufficient airspeed is reached to dump that purged fuel from a dedicated cannister in the nacelle. That fuel goes out a separate line well away from the engine exhaust.

As I recall.


User currently offlineScootertrash From United States of America, joined Aug 2001, 569 posts, RR: 9
Reply 6, posted (11 years 3 weeks 6 days 18 hours ago) and read 1755 times:

Yikes!

Just talked to a wrenchbender buddy of mine. He said "of course that's the oil breather tube, don't you know that?"

Not the first time the mighty Dash has humbled me, and it won't be the last.


User currently offlineYikes! From Canada, joined Oct 2001, 284 posts, RR: 1
Reply 7, posted (11 years 3 weeks 6 days 11 hours ago) and read 1731 times:

It's a great airplane indeed.

User currently offlineApathoid From , joined Dec 1969, posts, RR:
Reply 8, posted (11 years 3 weeks 5 days 21 hours ago) and read 1696 times:

Yikes is absolutely correct. It's nice to hear someone speak so eloquently of my beloved DeHaviland's in here. The venerable Twin Otter is the finest aircraft ever built.

User currently offlineViflyer From US Virgin Islands, joined May 1999, 500 posts, RR: 0
Reply 9, posted (11 years 3 weeks 3 days 21 hours ago) and read 1631 times:

Thanks all for the replys, I use to be LGA based and I couldn't get a straight answer from any of the crews I worked with (mainly because all of them mostly flew Metros, J32s, Saabs, and ATR's).
Thanks again



I reject your reality and subsitute my own
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