Originally Posted by
joepilot50
Prelim is out.
Short and sweet of it is approach speed was set appropriately at 149 knots per EDV guidance, power was at 64%, 175' airspeed got a bit slow at 144 knots, power remained the same, 150' airspeed spiked to 154 knots, PF brought power back to idle and remained there until touchdown. They lost the gust and the airspeed began to bleed off from there. Sink rate GPWS went off and airspeed decreased to 134 knots at touchdown where the right gear felt 3G's of force at 1098 FPM.
Sounds like a screw up all around. If going to idle is what it takes to arrest an increase in airspeed especially at 150', they should have went around. Or at the very least, only reduce power, but never go to idle and anticipate bringing it back in once the gust is lost. But go around would be the preferable and desirable course of action obviously vs trying to save it.
150' was plenty of time for the captain to intervene and either say something or take control. Both were at fault in this accident just going off the prelim.
You would normally idle that thing at 10'.
15 knots slow => big loss of lift, all else equal.
Ooops.
The part of the gear sidestay that's shown edge-on in the video looks like clean brittle overload failure. Brittle due to sudden impact, overload for obvious reasons. It doesn't show a direct view of the edge of the web between the padeyes, might be some sort of corrosion or fatigue induced failure there, which could have precipitated the overload failure of the main beam.