speed reduction to 250 IAS

[bflyer]

Hi everybody

Is there any time limit for speed reduction from a descend speed of, say 300 IAS to 250 IAS when radar-vectored in the approach area?
A figure of 2min / 1 min was mentioned.
My understanding was that one should do it asap..but don't know if asap is time limited
thanks for your time
bf

[Blockla]

I'd imagine it's very variable in terms of what you actually get, but I've always worked on 1K per second... So around a minute is reasonable for this request, but it depends on what the a/c is doing, on a good rate of descent etc will get significantly less reduction in speed when compared to level flight.

[bflyer]

thanks Blockla....sounds rasonable, 60kts in 1min looks like a good figure
300 kts to 240 in one min
thank you for your time
regards
bf

[PPRuNe Radar]

I'd agree 1Kt per second is the generic 'Rule of Thumb' for speed reductions.

[Tight Slot]

Hmmm, try that in a heavy A330 and it will be fun!

[PPRuNe Radar]

Try getting an A330 or A340 to climb at anything more than the curvature of the Earth ... at any weight ;)

Seriously though, ATC do not expect instantaneous speed reductions and don't plan on them. Those lucky enough to have Mode S downlinked parameters can soon work out how quickly the IAS is changing :ok: