The second topic concerns the suggestions (an investigator’s initial observation even) that the aircraft progressed laterally along the runway to settle on the grass. Not only does the condition of the undercarriage make that improbable, but the usual dynamics would have caused the aircraft to pitch onto its back and leave the wreckage facing the other way.
Investigators to reconstruct remains of stricken aircraft | Irish Examiner
Quote: "....The AAIU probe, led by air accident inspector Leo Murray, has already established that the tip of the Fairchild Metroliner’s right wing hit the runway as it landed in fog on Thursday morning. The plane then turned onto its roof and ran almost 200 metres along the runway before veering into a muddy verge where one of the engines caught on fire..".
The above was confirmed directly by the investigators over the weekend, I think the implication is that the aircraft flipped immediately and travelled along the runway inverted. The investigators have confirmed there was a debris trail for 180-190m before the aircraft left the runway.