@Shalvenay Why would you be lower and slower more? I’ve always heard that dive and drive was less safe
@Shalvenay ymb’s answer says something about 4-D trajectory is needed to achieve conflict-free CDA. So I guess it has to do with less accurate airspeed control. I dunno, though.
@TomMcW I think the detractors misunderstand when the dives are happening in dive-and-drive, really. if you step down as soon as you can, you'll actually be lower/slower more often than you would on a CDFA
@TomMcW in high density airports, where there are a lot of planes -- in a proper CDA it's the pilot, not the ATCO, that knows the optimum top of descent, now in a very busy environment, if each pilot flew their optimum VNAV path, then conflicts happen
on paper it seems like a really cool idea, apply it to a high density airport, and it's a cool idea that requires very high tech
the solution is for the ATCO to know each pilot's ToD
they can ask by voice, but that's making things worse, so an automated way to each FMS to downlink its 'future plans' is the way to go
then if a conflict is detected ahead of its time, a plane or two can be delayed to solve that conflict
@TomMcW topic change, about your London City comment, it may seem like one runway, but it's one of the hardest single runway apts to control out there, mainly due to the high traffic and that there isn't a full length parallel taxiway
@Koyovis not sure if you saw my comment, but with regard to this aviation.stackexchange.com/a/47531/14897 maybe it's better suited for chat--I was saying a heavier plane needs a gentler pull, due to the load factor on the heavy wings + the diminishing vertical lift
or is that not correct
@DanHulme true, initially I dismissed it as a pilot's-only problem
it doesn't feel that steep to me, because the Tiger Moth likes really steep approaches
if you're number two on approach, you always have to be careful not to turn inside the number one, because they're probably running a much longer final than you
@ymb1 EGLC sure isn't built for high volume. All that back-taxiing. How do they get anything done?
I have always wondered why tod isn't part of an IFR flight plan. I asked a question about it at some point. It seems to me that they should be able to figure out where that will be ahead of time. If conditions change dramatically, then they'd have to update, just like anything else in the flight plan.
@TomMcW and to play the devil's advocate, all that spending on the cool tech to increase the capacity by 30% (IIRC), can be solved by using bigger planes :P :D
bring back the A300! :P
from 1994:
> ATN's coming into existence, however, requires at least three things: cash invest- ment; a modest degree of technical advancement; and agreement over how to proceed. What is emerging, most recently at Flight International's Paris datalinking conference, is that the final element is in short supply.
In This question there is discussion about how to determine when to start the descent from cruise. There are several factors at play and it is usually calculated for maximum fuel performance.
Would this calculation not be done ahead of time, especially for aircraft cruising in class A airspace ...
@TomMcW so it's two parts, what's been said which is not knowing the exact, and taking into account the other traffic, which brings up the CDA issue, communicating those trajectories and simulating before hand any conflict
@ymb1 Casey said in his answer that the FMS calculates it based on the STAR. Doesn't seem that hard to include it in the FP. That'd be a start. But, yeah, with so many different AC types with differing descent profiles, etc. It would be a task for the ATC computer you make it work
@ymb1 The real question is how a few inches of snow can gum up KMEM so badly. They got another storm Monday night, so we're still running a full day behind.
@ymb1 It must be. They don't seem to be having that much trouble getting flights in/out. During the the years I worked there we didn't have a single snow accumulation. It only actually snowed, as in real, significant flakes, twice. It just melted right off. So I don't know what kind of chaos it creates on the sort