Originally Posted by
Nightstop
The open potable water access panel is underneath the rear passenger door, the aircraft appears to be parked and coned correctly. So, I’d suggest the potable water tanker skidded on the icy Apron surface while reversing into position after “honey” wagon had left the scene.
Then why/how would the water access door already be open? It's unlikely anyone would have opened it after the accident, so it's logical it was opened before.
As a guess I'd suggest it's more likely the truck was positioned as normal, the operator got out, opened the accesss door but had left the (auto-gearbox) truck in reverse and it just trundled off without him.