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A Puff Of Smoke From The Wing Of A 727?  
User currently offlineB737-112 From United States of America, joined Nov 1999, 891 posts, RR: 5
Posted (2 years 11 months 6 days 3 hours ago) and read 6479 times:

If you go to about the 5:30 mark of the attached video, you'll see what appears to be a plume of smoke come out of the top of the Boeing 727's wing. If anybody has any insight as to why this would happen, please let me know.

Thanks,
Ryan





http://www.youtube.com/watch?v=JdB5HfI3DZ0



15 replies: All unread, jump to last
 
User currently offlinenutsaboutplanes From United States of America, joined Jul 2010, 504 posts, RR: 8
Reply 1, posted (2 years 11 months 6 days 3 hours ago) and read 6465 times:

I believe that the 727's APU vented from the wing. This looks like an APU start-up shortly after arrival.


American Airlines, US Airways, Alaska Airlines, Northwest Airlines, America West Airlines, USAFR
User currently offlineaussiebrat From Australia, joined Jan 2009, 12 posts, RR: 0
Reply 2, posted (2 years 11 months 6 days 3 hours ago) and read 6456 times:

Its the auxiliary power unit doing its thing. The vent is visible from the cabin, located around the wing exit markings.

[Edited 2011-11-24 01:22:55]


"It is fatal to enter a war without the will to win it." - General Douglas MacArthur
User currently offlineB737-112 From United States of America, joined Nov 1999, 891 posts, RR: 5
Reply 3, posted (2 years 11 months 6 days 3 hours ago) and read 6450 times:

OK, thanks guys! I had no idea that the APU vented there.

User currently offlinenutsaboutplanes From United States of America, joined Jul 2010, 504 posts, RR: 8
Reply 4, posted (2 years 11 months 6 days 3 hours ago) and read 6419 times:

Here is something that I found that you might be interested in. While I worked at NW, there were several instances where evacutations were initiated by passenger onboard the 727 due to "APU torchngs". This link talks a bit about the spectacle and my understanding is that it can light up a dark cabin at night.

http://actacting.com/theatre-acting/aa-flight-panic-487838.html



American Airlines, US Airways, Alaska Airlines, Northwest Airlines, America West Airlines, USAFR
User currently offlineB737-112 From United States of America, joined Nov 1999, 891 posts, RR: 5
Reply 5, posted (2 years 11 months 6 days 3 hours ago) and read 6348 times:

nutsaboutplanes, that's a fascinating read. Thanks!

User currently offlineTomassjc From United States of America, joined Jan 2010, 886 posts, RR: 2
Reply 6, posted (2 years 11 months 5 days 15 hours ago) and read 5527 times:
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Quoting nutsaboutplanes (Reply 4):
While I worked at NW, there were several instances where evacutations were initiated by passenger onboard the 727 due to "APU torchngs".




We had 2 such instances with the 727-264 when I worked at MX. One at LAX, when the aircraft was clearing the runway and the "U-pa" (APU in Spanish) was fired up, pax seated on the starboard side initiated an evacuation after seeing a flame shoot out of the APU exhaust. Fortunately the flight attendants knew what was going on and got everyone under control.

The second one on taxi in at SFO in the early 80s (In the alley between the original international terminal and the old WA gates) resulted in a full evacuation through the L1 door by a not so savvy crew. I vaguely remember piles of shoes in the forward galley and walking passengers to customs in their stocking feet. Talk about embarrassing!

Tomas SJC



When once you have tasted flight, you will forever walk the Earth with your eyes turned skyward -Leonardo DaVinci
User currently onlinemaxpower1954 From United States of America, joined Sep 2008, 1110 posts, RR: 7
Reply 7, posted (2 years 11 months 5 days 13 hours ago) and read 5349 times:

During the original design period of the 727, small gas turbine APUs were still impractical. Late in the development phase, Garrett perfected one, but the 727 design was already frozen. So the APU was located in the left wheel well area, with the APU exhaust on the top of the left wing. BTW, the APU cannot be used in flight on the 727 because of this location.

User currently offlineshufflemoomin From Denmark, joined Jun 2010, 480 posts, RR: 2
Reply 8, posted (2 years 11 months 5 days 12 hours ago) and read 5172 times:

To be honest, the video explains itself why it happens. It told you exactly what you just heard here.

User currently offlineB737-112 From United States of America, joined Nov 1999, 891 posts, RR: 5
Reply 9, posted (2 years 11 months 5 days 8 hours ago) and read 4121 times:

Quoting shufflemoomin (Reply 8):
To be honest, the video explains itself why it happens. It told you exactly what you just heard here.



I added that text when the answer was explained to me above, the video is on my channel and I did that to answer the question for people who may be curious as I was.



User currently offlineoldtimer From United Kingdom, joined Aug 2006, 191 posts, RR: 1
Reply 10, posted (2 years 11 months 5 days 3 hours ago) and read 4037 times:

Quoting maxpower1954 (Reply 7):
with the APU exhaust on the top of the left wing.



Exhausts on top of right wing, inboard and some models had a flap that opened prior to startup, others had a grill. A well worked APU was evident by the exhaust stains under the overwing exits.



Oldtimer, I should have known better!
User currently offlinen901wa From United States of America, joined Oct 2009, 468 posts, RR: 0
Reply 11, posted (2 years 11 months 5 days ago) and read 3977 times:

Man I remember changing the 727 APU. Here's a photo I took back when, that shows the exhaust and half of the APU in the RT Main W/W, looking fwd in a WAL 727-247. The Oil tank is right below the duct.
WAL 727-200 WW


User currently offlineB737-112 From United States of America, joined Nov 1999, 891 posts, RR: 5
Reply 12, posted (2 years 11 months 4 days 17 hours ago) and read 3795 times:

Quoting n901wa (Reply 11):
Here's a photo I took back when, that shows the exhaust and half of the APU in the RT Main W/W, looking fwd in a WAL 727-247. The Oil tank is right below the duct



Awesome pic, thanks man!



User currently offline737tdi From United States of America, joined Sep 2007, 903 posts, RR: 1
Reply 13, posted (2 years 11 months 4 days 16 hours ago) and read 3777 times:
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Quoting n901wa (Reply 11):
Man I remember changing the 727 APU. Here's a photo I took back when, that shows the exhaust and half of the APU in the RT Main W/W, looking fwd in a WAL 727-247. The Oil tank is right below the duct.


WAL 727-200 WW

Thanks for that pic. Wow that brings back some old memories. I worked on Fed-X 727s at the old Dalfort MRO and removed and installed a few APUs. That is an awfully clean wheelwell. Usually never see them that clean. I work strictly 737s now.

737tdi


User currently offlinetb727 From United States of America, joined Jun 2005, 1616 posts, RR: 9
Reply 14, posted (2 years 11 months 4 days 15 hours ago) and read 3768 times:

Quoting 737tdi (Reply 13):
That is an awfully clean wheelwell.

Yeah that is the cleanest well I've ever seen! You get dirty just looking in ours.



Too lazy to work, too scared to steal!
User currently onlinemaxpower1954 From United States of America, joined Sep 2008, 1110 posts, RR: 7
Reply 15, posted (2 years 11 months 4 hours ago) and read 3310 times:

Quoting oldtimer (Reply 10):
Quoting maxpower1954 (Reply 7):
with the APU exhaust on the top of the left wing.



Exhausts on top of right wing, inboard and some models had a flap that opened prior to startup, others had a grill. A well worn APU was evident by the exhaust stains under the overwing exits

It's been over 20 years since I last flew the 727, my memory let me down - thanks for the correction!

Maxpower1954

[Edited 2011-11-30 01:13:33]

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