Originally Posted by
k.swiss
Dear Colleagues,
As a general rule it is suggested 3NM before FDP to select FLAP 1. (conditions permitting) However on some straight in approaches you may be cleared for the approach from a high altitude and more than 25NM from the field. In this scenario, you will be intercepting the LOC and GS well before FDP.
In such situations it is advised to activate the approach phase 15NM from the field but when is the correct time for FLAP 1as there is no longer a requirement to be at platform altitude to intercept the GS from below? What I would expect is we would select FLAP 1 prior to GS capture but that would be too early from about 10-15NM resulting in us dragging it in. However I do not want to be on the GS without at least FLAP 1 as per FCOM.
Thanks in advance!
So it really depends…
if you’re not doing a straight in as a general rule you want flap 1 on base leg (no later then when on an intercept heading for the LOC) ATC should inform you of this with language like “…on this heading you are cleared for the approach”
if flying straight in remember you can always activate the approach early and maintain your speed in selected mode until you want to decelerate towards green dot.
if doing a decelerated style of approach you’ll want flaps 1 and S speed out at least 2-3 miles before FDP otherwise achieving Flaps 2 will be tough without speed brake/gear once on the GS.
it’s quite rare to be cleared for an approach as far as 25nm and in most cases ATC will clear you for the approach and clear you down to the platform altitude at the same time so in this case simply keeping slightly below the GS (ie 1 dot) simply by using VS having armed the approach should allow you to manger the energy until closer to the FDP.
communicating with ATC for further descent even after cleared for the approach way out at an altitude higher then platform may help your situation so long as you respect the MSA/terrain etc.
so to answer your question, it’s imperative to have flap 1 min out and S speed before GS capture. And off all else fails you always have the gear! 😆 nothing will slow you down better then those bad boys. Bit noisy though out at 15nm
i hope that helps.