Good info on the "bump".
What about the "L" in the GE90-115 B1L1?
Also, is there any significance to the "1" in both terms? Probably just a serial number I am guesing, but can't find out for sure. Have searched many times for some info, and like 160 kts says, very little on the bump from GE and Boeing FCOMs; same about the "L" term.