PPRuNe Forums - View Single Post - A320: flaps full or flaps 3+speed brakes?
Old 2nd Oct 2008, 22:58
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flyingins
 
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If you can see that you're high on any sort of approach, but particularly a visual approach, it is more effiacious to select "VS 0", configure to CONF FULL, Gear Down and reduce speed to Vapp (this occurs quite quickly when level), then push forward to achieve a rate of descent which will re-capture your approach path to the runway by an appropriate altitude (to allow the engines to "spool up" by 500' AGL). Close attention must be paid to rates of descent approaching the ground (as a guide, VS-2000 at 2000', -1500 at 1500' & no more than -1000 below 1000').

It seems utterly counter-intuitive but given that CONF FULL is basically all drag and you've reduced your speed across the ground to an absolute minimum (Vapp), pushing forward at that point will provide the steepest angle of descent with all other factors required for landing (except Vapp since your speed will increase to not above 177 knots!) already accomplished.

This technique is best applied to visual approaches, since ILS, LLZ, GPS, VOR and NDB approaches (if conducted in IMC) have a higher "stable" requirement; in my company, we must be stable by 1000'AGL on an ILS, and the earlier of 2000' or the FAF on NPA's. If you're high enough to have to try to correct to profile using any unusual technique in IMC, you'll almost certainly be better off discontinuing the approach, or doing a go-around!
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