Originally Posted by
HighFlight
No, it was a fellow pilot telling me to engage NAV mode around 200’. The CFM tells us to select speed mode at V2 + 10, and HDG/NAV mode at 400’. Then he requested A/P on about 3-400’ vs. 600’. Said it was in a memo, but I did not remember such.
Technically it doesn't matter when below 400' you engage NAV mode because it automatically goes to HDG mode IF below 400'. Then it switches to NAV at 400'. If you engage HDG mode first then it requires a second button push, this time NAV mode, at 400' or higher.
At AWAC we departed out of DCA RWY 01 about four times a day and we would engage NAV mode at gear rotation whether using the National Five (using the VOR) or subsequently the RNAV procedures now in use.
BUT, as always, policy is policy so if it says wear out your finger pushing extra buttons, do it.