When the 300ER came out, it had some airframe vibration problems. The fix was to fly the aircraft at lower FL. So the CoG was moved forward to limit the maximum envelope. Initially it was 7.5% MAC, however it's been changed to 17.5% MAC.
Standard 200/200ER/300 is 30% MAC. The 200LR and 200F is 20% MAC.
Last edited by oz in dxb; 28th November 2009 at 11:25.
Reason: Additional models added