Vixen
Penultimate Amazing
These two links say the lugs on the bottom lock failed through overload though it's not quite clear to me whether the pin was ripped out of the lugs or the lugs were torn off their welds. Either way the lug on the visor was able to slip off the pin while remaining attached to the visor, though that lug was both stretched and somewhat bent:
https://web.archive.org/web/2004081...nettomuustutkinta.fi/estonia/chapt12_3.html#1
https://web.archive.org/web/2004081...nettomuustutkinta.fi/estonia/chapt13_2.html#3
It does say the likely sequence of the progressive failure had the locks fail before the hinges, so the visor was not dangling on its bottom lock as Vixen suggested.
By the JAIC's own account, it was, with the two side locks having come off.