boeing772er Someone correct me please if I am wrong, but aren't the last two digits of the engine designation the thrust rating?
Example: RR Trent 884 = 84,000 lbs thrust
RR Trent 892 = 92,000 lbs thrust
Another exmample: P&W 4152 = 52,000 lbs thrust (in this case the engine series is 4 = 4000, the airframe is 1 = Airbus.
Just curious guys.