cfm56-3/B1/B2/C1 MATURE ENG EGT MARGIN DETERIORATION

[albervama]

Please, anybody can help me; I need to know how is the deterioration of EGT MARGIN for CFM56-3/B1/B2/C1 and the recomendable EGT MARGIN for lease engine acceptance; the engine will operate at 22K thrust.
We were offered a 3C1 engine with 27 degrees of EGT MARGIN at 20K with cycles of last shop visit of 6500.

[Jhieminga]

Have you tried getting in touch with a rep from CFMI? I recall that there are figures which will give you an idea of the margin that you'll have left at 22k but I cannot recall them, and don't have them available either. As for deterioration rates, there is a very large range of rates that I've seen on these engines. Can you get trend data for the engine? That will give you an idea of how it has been deteriorating on the previous installation.