Na’vi River Journey could not be made accessible because the size of the boats. I have heard the size of the boats was limited by the tightness of some of the turns. I also explained already why it would not work.
Because of nature of the ride, the extreme movement of the ride and the quickness, I don’t see how a modified ride seat could safely fit and restrain wheelchairs and also keep the rider safe. The entire front of the room tilts and moves down and the front part of the ride vehicle that guests lean against is a big part of the restraint.
If every guest used an identical wheelchair, maybe something could be designed.
But, wheelchairs come in all shapes and sizes. Some sit much lower to the ground, while my daughter sits pretty high. Straight wheels or wheels with camber (flared out at the bottom); a little camber or a lot. Some wheelchairs have backs that are low (like mid back); others come high up and around for support. More traditional style wheelchairs have the big wheels to the rear, but some have the small casters to the back and the big wheels to the front. There is just too much variation in wheelchairs to design a vehicle that would fit all.
The attraction does have a special transfer wheelchair and a lift that guests can use to transfer from their own wheelchair to the regular seat, so although what they provided doesn’t fît everyone’s needs, it does go well beyond what is required.
There is more discussion about the Pandora attractions in the Pandora thread near the top of this board.
It would not be technically feasible in either Pirates at WDW or in Frozen at WDW.
Since both are boat rides, the issue I mentioned earlier with the wheelchair needing to be in the center of the boat so it stays balanced comes into play. Both attractions include significant drops (Pirates is 14 feet from what I have read) and Frozen also has a very steep uphill climb. It’s not as simple as just parking a wheelchair in the center of the boat as happens on the flat, slow moving boats like Small World or Mexico. The wheelchair would need to be secured well due to the drops (and Frozen has a very bumpy track in the uphill parts).
And because it’s real water, the vehicle can’t open into its own ramp like Epcot’s Nemo or MK’s Little Mermaid.
Bill’s comments about changing the dock level to make the seat more level with average wheelchair seat level make sense. I don’t know what effect that would have on other guests needing to climb over the side.
I’ll only comment on Autopia/Indy Speedway and Tea Cups since the others are
Disneyland attractions I have not been on.
A Speedway car would need a ramp to load, which could maybe possibly be designed like the fold down ramp on Little Mermaid or Aladdin. But, big difference between a ride car running at a constant speed on a track and a vehicle that is being controlled by the person in it. It would not be a matter of just driving the wheelchair in; it would need to be well secured.
I’m pretty sure the Teacups are too small to meet the minimum size guidelines.
Jungle Cruise has a pretty cool wheelchair lift and it seems like a very simple design when you look at it and see it in use. But looking simple doesn’t always mean it was easy.
I knew a CM who worked at Jungle Cruise while it was being developed and he kept me updated on the progress. He didn’t know how many never made it to the point of fabrication and testing, but he knew it was quite a few.
There were a number that made it to the point of installation, but then didn’t work. He told me that several, including the current design, actually sunk the boat.