Added altimeter
Added electric and magneto switch bars
Added directional gyro
Added circuit breakers
Make aircraft data be saved once a minute
Fix inverted normals
Fix parking brake handle rotating the wrong way
Add 310R and T310R service manual
Animated parking brake handle and fixed cabin door handle position
Add parking brake handle (by @chad3006) (#8)
* Add files via upload
* Fix praking brake model path
Co-authored-by: chad3006 <chad3006@...>
