That seems plausible. An inclined spiral may look like a loop without robbing all the energy at the top. It is hard to imagine a jammed elevator control situation that would result in continuous loops that didn’t end with a stall at the top rather than over-g at the bottom. Worth spending some time to think about the dynamics of a full-aft stick versus witness accounts. They may not line up exactly right.

If the witness accounts are remotely accurate G-LOC would be plausible as well.

An awful mystery.

Andy Blackburn
9B