when I press "w" key in the cabin view does not appear
Sounds like you have deleted the 'default' folder from the '...\Flight Simulator 9\aircraft\...' folder.
The displayed instruments are called a mini-panel. The default a/c have theirs coded in their 'panel.cfg' file while most add-ons use an appropriate mini-panel from the
'....Flight Simulator 9.0\aircraft\default\panel\panel.cfg' file.
You can recover the folder from CD1. (or check your Trash Bin and restore it if there)
Cheers,
Dave
The 'w' key cycles 2-D views, while the 's' keys cycle thru 2-D, V/C, Tower, Spot views.
At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.