737-800 VNAV arm before takeoff.
For what technical reason(s) if any, would you not arm VNAV before takeoff on the 737-800, if you have U10.8A installed?
Is there hardware issues? Or does it have something to do with having a mix of CL/NG aircraft in the fleet and pilots who fly both?
I've been searching for an answer for weeks; no dice. Pprune was my last resort.