Originally Posted by bearfoil
Still, "Clean at impact"? "Clean all the way down"? If speed is a problem, dirty is good?
RTL still limited at this settings means no slats used all the way down as, if used, its settings would be quite different from Mach 0.80/272 kts. IMO, it also means that two ADRs were turned off after ADR disagree and that this fault was not cleared. No flaps, spoiler at impact is no proof they were not used at one point, but no proof either of any use and later retractation.
If two ADRs (with blocked pitots) were considered reliable by the crew, then turned ON at any point, they could not have remained frozen from FL350 to sea level, hence, at one point in the descent, the airspeed displayed would have been the "real" one and it would certainly not be 272 kts at impact (as shown by RTL) following the BEA description.