60FltMech-re the 60M model main box ratings: I don’t think they have changed from the 3400 shp box in the L, that is, dual engine continuous 100% above 80 KIAS, 120% below 80 KIAS. 100% is 2800 shp/120% is 3400. Sent a note to the M project pilot, who s retired like me and will get back when I can.
Apologize for being tardy with a response.