westhawk:
But I appreciated the opportunity presented to review AC 120-91 again aterpster.
This is probably the single most misunderstood and misapplied operational requirement I've encountered in my experience as a part 135 pilot. The very few pilots who do seem to grasp the concept are grossly outnumbered!
Anyway, it's been a treat!
If nothing else AC 120-91 sends a strong message that Part 121 and 135 operators that operate Part 25 birds really do need the expert assistance of performance engineers.