Thanks. That's close to what my FCOM is saying -- 349 knots (MMO/VMO - 16) for the DRAG REQUIRED message, then up to 354 knots (MMO/VMO -11) before it drops out of VNAV PTH to VNAV SPD and resets FMC target speed to MMO/VMO - 16.
It just seems like I have seen DRAG REQUIRED when I wasn't going this fast. Is there something outside of this specific VNAV PTH descent that would trigger the DRAG REQUIRED message?
(EDIT): Maybe I misunderstood you. Are you saying that you think the DRAG REQUIRED message happens when more than 15 knots above FMC target descent speed?
I have a friend who is a captain on the 747-8 at NCA. He often tells me about the -8 "anomalies." He thinks that Boeing pulled a lot of their software engineers off the -8 project when they had trouble with the 787.
Last edited by cf6-80c2b5f; 3rd Aug 2015 at 06:12.
Reason: EDIT