Definitions
John,
My sentiments exactly. However thats what they want.
Anyway, let me try and decipher some of your queries.
Formulas for the MD-80 series:
Index = ((Wt*(Arm-922)/1000)) + 5000. 922 is the Datum.This formula is not for individual items. For individual items remove the 5000.
% MAC = ((Arm-885.547)/158.512)*100. LEMAC = 885.547, MAC = 158.512
Forget the Stab Trim Equation for the moment please. Regarding the % MAC Equation:
Reference Weight: I have no idea what that is.
Balance Arm / %MAC: Each 1 % MAC change corresponds to a certain amount of inches of arm movement, in this case 1.6 inches.
Datum %MAC: This the Datum in inches converted to %MAC. In this case 23%.
Boeing guys help us out here please.
I think this information is available with access to My Boeing Fleet.
Ev.