Well, I stumbled on this today, it seems to be the issue.
It is temperature driven.
See this article:
OAT of 248 C ?! (Impacts negatively on aircraft performance and autopilot function)
Well, I stumbled on this today, it seems to be the issue.
It is temperature driven.
See this article:
OAT of 248 C ?! (Impacts negatively on aircraft performance and autopilot function)