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Old 21st Aug 2012, 04:07
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Silvio Pettirossi
 
Join Date: Apr 2006
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Question A320 Engine "thermal stabilization" on approach?

Hello Everyone!

A question for the Bus experts around here.
You are descending below 10.000feet in DES mode and due to say, changing winds, the plane becomes a bit low on the calculated ramp and the speed bleeds off to say, 230kts. Now you approach the FMGS created ALT CSTR just before the desceleration point, the plane levels of and the thrust goes in to SPEED mode to recapture 250kts just before slowing down again do to APP FACE auto-activation. These produces a rather large power surge with the associated noise and potential PAX disconfort. Now, some of our capitains try to avoid these by activating the APP FACE earlier, while others say these fenomenom is necesary and build in to "stabilize" the engine temps for approach ore even to "de-ice" the fan blades
I find these explanations a bit strange
I tried to find something about it on FCOMs and FCTM but was unsuccessful.
Does anybody know something about these, or is it just a myth created within our company
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