RE: BOEING 777 QUESTION?
Ok first thing. Make sure you have enough positive trim to help the airplane lift off. Without trim it will never get off the runway with out running off the end.
Second, make sure you switch over to Mach when you get that high. Click the Mach button instead of the SPD button when. Usually when I fly the triple 7 I climb at 2,000 feet per minute, have the plane hold 310 kts. When the speed starts to slip I click the Mach on the autopilot then set it to .80. Once cruising I then set it to .85. Good luck.
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