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Let me get this straight; .. the 189 is a civil variant of the 149 which, in turn is a military version of the 139. If the civilian version of the 149 equals the 189 (as a derivative of 139) this means that the new designator (assuming constant values for the numbers 1 and 9) is the sum of both the civil and military versions (ie. 3+4) plus a factor of one (presumably added as a result of the new designation). This being the case, any new designations would, one imagine, follow a similar pattern.
Therefore, the next AW product should be the AW1149 based on the 169, its military equivalent the 179 (following the above pattern) plus a factor of one, ie: 6+7+1 = 14.
