CFM56-5B series available for the A320 family. To date 3,500 A320 family aircraft have been ordered, and about 2,000 of these have had CFM56-5A/-5B engines specified. Configuration The CFM56-5A/-5B have a two-shaft design, and overall have four and eight different thrust ratings between 21,600lbs and 32,000lbs thrust (see table, page 9). -5A ...