FAA grants STC for Low Plasticity Burnishing
The first FAA Supplemental Type Certificate (STC) for Low Plasticity Burnishing (LPB) has been granted to Delta Air Lines’ maintenance division, Delta TechOps, to mitigate fretting induced fatigue cracking in the high pressure compressor section of the CFM56-7. The initial STC, SE03036CH, allows the use of LPB on the first stage blade. LPB was shown

