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Old 10th Aug 2013, 04:09
  #264 (permalink)  
Capn Bloggs
 
Join Date: Mar 2002
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Raising the nose momentarily by a couple of degrees (read level flight, not a climb) is entirely dependant on the severity of the shear and where it occurs
while it does increase the glide deviation, and seems counter-intuitive, its energy management 101, if you're above path in descent because of atc(energy gain in this case), you slow down while level and then accelerate to recapture your profile once you can descend, (lower groundspeed in this case) so you can still lose enough feet per mile to recapture the glide as opposed to being high and fast. this is done knowing:

A- the wind you have on the ND is trending towards the reported surface wind which means it wont normally swing round again.

B- pireps give you some clue as to where you can expect the shear, and so you know if its at 1000 feet you have time to correct, if its at 200 feet and is not severe, you can manage it, probably without having to raise the nose at all just reduce thrust

C- If you cant recover it... just go around.
I still disagree. Fair enough going high to slow down before the ILS (jet energy management 101) but pulling up off the GS (even if only to "level") to slow down, given you'd already be at Idle, is IMO not a good idea, regardless of what you think might happen later. Better to be fast and on the GS/PAPI than high and on-speed and poking the nose down to get back on it at low level.
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