Upgrade to turbo engines

[WebMaster]

Rob, it's a certification thing. The P models are only certified to 20K, and riley certainly isn't going to change that part of the certification. Also, at 20K, they have a 10K cabin, so you wouldn't want to go much higher. Others have suggested that if you depressurize a P model, you can go as high as the T models, which is like 30K. Of course that requires the appropriate Oxy system.