T55 Turboshaft Engine Update 
Tony Rich (TAPO)

Q1. Rob Jackson: Tony, in the UK we've had issues with pop surging which we believe relates to erosion on the 6th/7th stages. Have you come across this and do you know if the coating reduces this issue?
A1. Typically, we do get alt of erosion in stages 6 & 7. I have not been informed about the coating effect on those specific stages.