A practical application of hawke37’s answer for your aircraft type would be to climb at maximum IAS (Vno) until you reach the altitude at which you attain your maximum Mach No (Vmo).
Alternately descend at Vmo until you reach the altitude at which you attain your maximum Vno.
The Flight Level (FL) of the intersection of Vmo/Vno will give the maximum TAS for your aircraft (in the range of FL150-300 for a sub-sonic a/c and at or above FL360 for a supersonic one).
Surprisingly, the relationship of FL/IAS/Mach No is such that given any two of the values the third is constant regardless of temperature.
If you fly the "Bus" (from your handle Alpha Floor), then M0.86/330 = FL298 (but you would already know this from your Emergency Descent practice in the Sim!)
Therefore, to obtain Maximum practical cruise TAS in the A330/340 model using M0.835 (Mach Crit Drag Rise is around M0.84) and 330 IAS = FL282.
For practical purposes say M0.835/325IAS = FL290.
Hope I twiddled my CR-4 properly!
Last edited by FlexibleResponse; 9th June 2004 at 12:49.