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Contrail From The Rear Of The A320  
User currently offlineYousef727 From Denmark, joined Apr 2004, 22 posts, RR: 0
Posted (11 years 4 days 2 hours ago) and read 3246 times:

A few times I've seen a single thin contrail coming from the most rear part of the A320, the same area as the APU exhaust in the tail. When I saw it the planes were on approach about 20 miles from the airport flying at aprox. 1500-2000 Ft.

Any explanations appreciated  Smile/happy/getting dizzy

Aviation all the way.......
6 replies: All unread, jump to last
User currently offlineSPREE34 From United States of America, joined Jun 2004, 2347 posts, RR: 8
Reply 1, posted (11 years 4 days 2 hours ago) and read 3188 times:

They were probably starting it (the APU) up. Some carriers do this on final so they can shut an engine off after landing for fuel conservation, yet still have full electrical and air conditioning during the taxi

I don't understand everything I don't know about this.
User currently offlineHaveBlue From United States of America, joined Jan 2004, 2158 posts, RR: 1
Reply 2, posted (11 years 4 days 2 hours ago) and read 3189 times:

Hopefully they are a lot higher than 1,500-2,000' at 20 miles out. 1,500' is the altitude you go around the pattern at a field if you are in a high peformance prop plane.

Just nitpicking  Smile

Here Here for Severe Clear!
User currently offlineYousef727 From Denmark, joined Apr 2004, 22 posts, RR: 0
Reply 3, posted (11 years 4 days ago) and read 3104 times:

Thanks for the answer - It makes sense  Smile/happy/getting dizzy


Aviation all the way.......
User currently offlineMeister808 From United States of America, joined Jan 2000, 973 posts, RR: 1
Reply 4, posted (11 years 3 days 15 hours ago) and read 3002 times:

Man, it must be really stinking cold up there in Denmark, because someone making contrails on approach is pretty unheard of.

Of course, we tend to have a day or two a year in ND where we can get Cherokees to make little itty-bitty contrails, so I guess anything is possible.


Twin Cessna 812 Victor, Minneapolis Center, we observe your operation in the immediate vicinity of extreme precipitation
User currently offlineYousef727 From Denmark, joined Apr 2004, 22 posts, RR: 0
Reply 5, posted (11 years 3 days 11 hours ago) and read 2956 times:


No it was not cold. It's summer here. Yesterday when I saw it, the temperature was 75F (+23C).
Probably it was not a contrail like the ones you see from planes flying at high altitude, but some kind of exhaust gas from APU startup. That's the explanation I'm thinking is the correct one.


Aviation all the way.......
User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6813 posts, RR: 54
Reply 6, posted (10 years 12 months 4 days 23 hours ago) and read 2757 times:

The contrail from the tail wasn't necessarily created by the APU. It might have been a vortex generated contrail like we often see them from wing tips in humid air.

Last Thursday, even if we had temperatures in the 70'es, the air was very humid. I watched a satellite photo of the country on the weather bureau web, and even if the cloud cover was scarce, then the whole country was practically covered with high altitude airliner contrails.

Often the contrails evaporate in minutes, but last Thursday they staid for hours and became thousands of feet wide.

Always keep your number of landings equal to your number of take-offs
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