PPRuNe Forums - View Single Post - A320 Flap overspeed during retraction?
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Old 23rd Jun 2013, 23:44
  #27 (permalink)  
PantLoad
 
Join Date: Jul 2006
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Not as long as

Not my problem as long as I've followed the SOP.....

The issue becomes relevant with the 321 (not the 320) when
the actual take off weight is close to 89T (for an 89T 321).
The problem is that the minimum speed and the maximum speed
are close. So, if you retract (from Flaps 1 to Flaps Zero) at
"S" speed (SOP), with pitch and subsequent acceleration
as typical, the slats become fully retracted extremely close
to 230 KIAS. (We're talking just a few knots....)

If you don't accelerate quite quickly enough, you could get
ALPHA LOCK. If you accelerate very slightly too quickly,
you get an overspeed by a few knots. Even if the pilot is
"Bob Hoover" quality, in turbulence, under the above-stated
conditions, it's possible to get either ALPHA LOCK or
overspeed. (Again, if you do it just right, you'll get the
slats completely retracted within only a few knots of the
230 maximum.)

Again, when Airbus went to 93T on the 321, they increased
the speed from 230 to 235. They had to....
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