On the 734 the speed is certainly a prime candidate.
You can sometimes get it to give 350 rather than 349 by altering the cruise mach number very slightly. I am wondering whether the actual OAT will have an effect also. I don't know how the FMC takes this into account but on occasion I noticed the max alt varying during the climb as it is recalculated.
Last edited by Seat1APlease; 29th Dec 2004 at 12:21.