yousef727
Posts: 21
Joined: Fri Apr 09, 2004 5:04 am

Contrail From The Rear Of The A320

Fri Jul 30, 2004 1:59 am

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.......
 
SPREE34
Posts: 1592
Joined: Tue Jun 29, 2004 6:09 am

RE: Contrail From The Rear Of The A320

Fri Jul 30, 2004 2:20 am

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.
 
HaveBlue
Posts: 2117
Joined: Fri Jan 30, 2004 3:01 pm

RE: Contrail From The Rear Of The A320

Fri Jul 30, 2004 2:23 am

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!
 
yousef727
Posts: 21
Joined: Fri Apr 09, 2004 5:04 am

RE: Contrail From The Rear Of The A320

Fri Jul 30, 2004 4:21 am

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

Yousef
Aviation all the way.......
 
meister808
Posts: 924
Joined: Sat Jan 01, 2000 11:45 am

RE: Contrail From The Rear Of The A320

Fri Jul 30, 2004 1:57 pm

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.

-Meister
Twin Cessna 812 Victor, Minneapolis Center, we observe your operation in the immediate vicinity of extreme precipitation
 
yousef727
Posts: 21
Joined: Fri Apr 09, 2004 5:04 am

RE: Contrail From The Rear Of The A320

Fri Jul 30, 2004 5:47 pm

Meister808

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.

Yousef
Aviation all the way.......
 
prebennorholm
Posts: 6562
Joined: Tue Mar 21, 2000 6:25 am

RE: Contrail From The Rear Of The A320

Tue Aug 03, 2004 5:37 am

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.
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