Latetonite,
My airline also uses 1000ft as Minimum FRA.Which is safer than just using the minimum based on obstacles(ie 600ft).
As far as i know we could accelerate higher (ie1500) as long as you are not TOGA time limited...
The fact than the FCTM (boeing) says 400 ft is the legal minimum FRA (as they are under FAA) doesnt help me to find out whether some ICAO licensing states use higher Minimum MFRA (ie 800ft).
I understand Boeing uses 1000 ft as MFRA for training as it is an easy nr to remember and safe in most airports.
Thanks all for your inputs so far.