Hi all, I’ve just been watching some vids on youtube of the 777-300ER taking off and 1 really has me confused.
I would asume on most take-off’s that as soon as possible the engines would be spooled back to climb power in order to conserve them over time, but on this particular one, at time interval 1:11, it sounds as if its the other way round.
Not sure bout linking to YT so I’ve left out the http bit,
http://uk.youtube.com/watch?v=Kl52FdVzK9U
To contrast this, here’s one I’d expect to be the more normal offering, time interval 0:51, reducing to climb power.
Ditto here with link, http://uk.youtube.com/watch?v=P7vxj327Eg4&feature=related
Any takers as to why the ACA engines are spooling up so much on that phase of take off?
Thanks for any info on this.
Edit; Links now in.
By: TJC - 5th August 2008 at 22:39
Next time please put the http in 😉 .
Upon passing 400/500 (I can never remember which one), climb power is automaticly selected, and either CLIMB, CLIMB1 or CLIMB2 becomes active. This usually causes the thrust to decline, and so the engine becomes derated.
I’m not sure about the sound, but maybe if the takeoff itself was derated, and it was a high speed climb out (high cost index), the change in thrust may not have been so significant. But the change in sound on this occasion of probably just caused by the microphone on the videographers camera.
I’m not a commercial pilot though, I don’t think we have any 777 pilots about, but i’m sure someone else will be able to help you.
Sam
Thanks for that Sam.
As stated in the original post I wasn’t sure if YT links were allowed or not so I left the http bit out.
By: B77W - 5th August 2008 at 21:39
Next time please put the http in 😉 .
Upon passing 400/500 (I can never remember which one), climb power is automaticly selected, and either CLIMB, CLIMB1 or CLIMB2 becomes active. This usually causes the thrust to decline, and so the engine becomes derated.
I’m not sure about the sound, but maybe if the takeoff itself was derated, and it was a high speed climb out (high cost index), the change in thrust may not have been so significant. But the change in sound on this occasion of probably just caused by the microphone on the videographers camera.
I’m not a commercial pilot though, I don’t think we have any 777 pilots about, but i’m sure someone else will be able to help you.
Sam
By: Deano - 5th August 2008 at 21:28
Link doesn’t work, just post a direct link
EDIT: appears YT was just running slow. It loads now 😉
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August 5, 2008 at 8:05 pm