Originally Posted by
tdracer
That is definitely impressive, but no doubt it had a big assist from the rather sizeable derate the CFM56-3 got when installed on a 737-500. IIRC Max takeoff on the 737-500 was less than max climb on a -400.
I've seen a number of CFM56-5B3 (33k rating) on A321 with 40k+ FH, some even close to 45k - first run without shop visits.