Shawn
Many years ago I was asked to audit a company that had suffered a fatal CFIT by the management of that company. What I was able to establish was that the 6-8 pilots regularly employed had all completed their 6 monthly IMC Base Checks on the same medium twin helicopter - the one owned by them.
The company routinely operated up to seven different medium twins but whilst they were all the same type each had a different avionics suite and area nav.
So, the only time you were asked to demonstrate your competence was on the same helicopter with very familiar avionics.
The rest of the time you had to struggle with any one of seven alternatives without one single jot of instruction on how the systems worked.
"The handbook is in the door pocket" - sound familiar.
Is it no wonder........
I bet there are charter outfits out there still doing the same.
G.