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A320 / A330 / A340 Families – Optimum Mach Number
The following appendix exemplifies how the Optimum Mach Number is presented in FCOM tables versus cost index (0, 100, 200, 300, 400, 500kg/min) altitude and wind as calculated by the FMGC. The examples here pertain to the A340-313E and are found in FCOM 3.05.15 pages 1 thru 5.
Cruise tables are established :
- for ISA, ISA + 10, ISA + 15 and ISA + 20
- with normal air conditioning and anti-ice off
-
from FL 290 to FL 410 at M 0.80, 0.82 and 0.84
-
from FL 100 to FL 410 at long range speed
- with a 30% center of gravity below 2500ft and a 37% center of gravity at higher altitudes.
Table 46. Optimum Mach Number
COST INDEX = 0 (MAXIMUM RANGE) COST INDEX = 100 KG/MIN
FLIGHT LEVEL FLIGHT LEVEL
Weight/wind 1000 kg/(kt) 310 330 350 370 390 410 Weight/wind 1000 kg/(kt) 310 330 350 370 390 410
150 100. .631 .661 .693 .721 .747 .771 150 100. .766 .782 .795 .804 .811 .814
50. .649 .678 .708 .734 .757 .776 50. .777 .790 .801 .809 .814 .816
0. .673 .700 .726 .749 .768 .783 0. .786 .797 .807 .813 .816 .818
-50. .696 720 .743 .763 .779 .791 -50. .795 .804 .811 .816 .819 .821
-100. .725 .745 .764 .779 .791 .799 -100. .802 .810 .816 .820 .823 .823
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