Differing a/c cruise speeds - what are the knock on effects?
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Differing a/c cruise speeds - what are the knock on effects?
I'm sure this one has been done before on PPrune, but couldn't narrow a search down well enough, and given the new A380 (see various current threads), thought it might make for some (re-newed) interesting discussion.
So:
- Does the A340 continue to get in the way of faster aircraft (eg B744) during cruise ?
- Any other aircraft that are fast or slow ? (Eg B767?)
- What about the A330, which is now being used regularly on many long haul missions ?
- What will be the cruise speed for the A380 ?
- Will the A380 also be a slow mover in the fast lane ?
- Does it matter ? Does it affect you ? If so, how & how much ?
Any comment from pilots or ATCO's ?
Many thanks
Z.
So:
- Does the A340 continue to get in the way of faster aircraft (eg B744) during cruise ?
- Any other aircraft that are fast or slow ? (Eg B767?)
- What about the A330, which is now being used regularly on many long haul missions ?
- What will be the cruise speed for the A380 ?
- Will the A380 also be a slow mover in the fast lane ?
- Does it matter ? Does it affect you ? If so, how & how much ?
Any comment from pilots or ATCO's ?
Many thanks
Z.
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A340`s are always in the way, as are 767`s.
Over Siberia, they even have their own airways! (three cheers for the Russians).
What it costs? In practice you settle for an off optimum level. For the 744, this means 4000 ft lower and an increase of approx. 4% in fuel consumption.
Over Siberia, they even have their own airways! (three cheers for the Russians).
What it costs? In practice you settle for an off optimum level. For the 744, this means 4000 ft lower and an increase of approx. 4% in fuel consumption.
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At the other end of the scale, one colleague lost seperation with a 734 on a SID followed by a Saab 2000, 2 minutes behind. Both had to level off at the SID altitude due other traffic.
Radar recordings showed neither broke the speed limit, yet the Saab accelerated to 250kts far quicker than the 73, and seperation was lost, degrading to 2.2 miles before becoming constant.
Bloody fast those Saab Screws
Radar recordings showed neither broke the speed limit, yet the Saab accelerated to 250kts far quicker than the 73, and seperation was lost, degrading to 2.2 miles before becoming constant.
Bloody fast those Saab Screws
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B767,A340,A330,A300 and occasionally the B777 are always getting in the way of 747s.
The same problems happen every day. A B767 (M.78) in the lead followed by a A340 (M.82) then a B777 (M.84) then a B744 (M.86). My question is:- Is any thought given to enroute separation requirements when scheduling. Pilots often complain when they can't get their level but if they left 10mins earlier or later it may relieve the problems most of the time?
The same problems happen every day. A B767 (M.78) in the lead followed by a A340 (M.82) then a B777 (M.84) then a B744 (M.86). My question is:- Is any thought given to enroute separation requirements when scheduling. Pilots often complain when they can't get their level but if they left 10mins earlier or later it may relieve the problems most of the time?