RB211 engine maintenance

[Pilot RatBoy]

Hi. I am currently doing a university project on the incident that affected G-BNLG on 20/2/2005 where number 2 engine surged on climbout. One of the reasons for this was excessive wear of the birdmouth feature which joins the HPC and IPC casings. I was just wondering if anyone knows how maintenance crews cehck this feature for wear, and if they are aware of any regulation changes following this incident.

Thank for reading,

Pilot RatBoy

[chemical alli]

it can be measured by using ,what is called a red fafc which will increase fuel flow by either 15% or 45%.engine is then run to 1.48 epr and if she goes boom then the clearances are no good ,i mean by boom surge