What was found
NR 2 ENG REVERSER MAKING HEAVY POPPING AND CRACKLING SOUNDS. AFTER INVESTIGATION FOUND UPPER SIDEWALL (UPPER BI-FURCATION PANEL) OF REVERSER 90 PERCENT DELAMINATION ON INNER SKIN. DELAMINATION WAS CAUSED BY THE FAILURE OF BOND LINE BETWEEN OUTER SKIN AND HONECOMB SECTION. BOND LINE FAILURE IS DUE TO HIGH HEAT IN THIS AREA IN COMBINATION WITH UPPER REVERSER COMPRESSION RODS HAVING A GAP LARGER THAN 0.050 IN. THIS ALLOWS FLEXING OF PANEL BY THE PRESSURE IN C-DUCT DURING THRUST. COULD BE REQUIRING PERIODIC REVERSER FIT CHECKS, WHICH ENGINEERING IS CONSIDERING ADDING TO MAINT PROG AT HMV.