If the seatbelts are off and the door is open on an Otter, then a pilot chute getting out the door is likely to be a problem for one person. I think by 1000ft the risk of it happening vs the odds that it can be handled by a jumper are reasonable. I'm familiar with the WFFC incident a few years back where the premature deployed into the horizontal stabilizer, but that guy climbed out and held on all the way to inflation which wouldn't happen in the case we're talking about.
If the seatbelts are on and the door is open a pilot chute getting out the door is likely to be a problem for the whole plane whether you're at 1000ft or not. The risk of it happening isn't really any greater than in the above case but the stakes are much much higher.
If a pilot chute goes out the door then the jumper connected to it is going to manufacture a new door opening, somewhere between the trailing edge of the existing door and the tail of the aircraft.
Not only will this severely compromise the structural integrity of the aircraft but it’s very likely that the control mechanisms will also be damaged in the process – not great for anyone still in the aircraft, especially the poor pilot.
Don’t be fooled into thinking that the jumper will be able to respond quickly enough by diving out of the door after their pilot chute – if they were that switched-on then they wouldn’t have gotten themselves into this situation in the first place.
Hopefully we’ll never get see which one of us is right about this.
I don't think they're automatically going through the bulkhead although I agree it's possible. Depending on the exact seating configuration of the Otter there are only a few people who are likely to have a pilot chute get out the door. I'm used to seeing said people sitting pretty close to and and at least slightly forward of the door such that if they were just sitting there haplessly with their seatbelt off they'd get slammed into the doorframe and drug out before the slider came "down." That's just my speculation.
I agree though, I wouldn't want to see either scenario.