I know A340 model designations are in the form "A340-ABC" where A is the series number (200, 300 etc) and B is the engine type. My question is this, what exactly does C designate - I know it describes the variation of the specific model in some way but what distinguishes each variation?
I have seen many descriptors such as A340-211,212,213,311,312 etc.
I think I read somewhere that -211 and -311 were the 5C2 engines, -212 and -312 were the 5C3's and the -213 and -313 were the 5C4 engines all with 257t MTOW- is this correct? Is the MTOW linked to the model number?
Does the -313X signify the 275t MTOW version?
Also, what is the difference between the different CFM56's used on the A340?
Again I think I read somewhere that the 5C2 was rated at 31,200lbs, the 5C3 at 32,500lbs and the 5C4 at 34,000lbs - is this true or is it more complicated?
Any help is much appreciated,