What was found
RECEIVED POST AIRWORTHINESS DIRECTIVE 2012-05-02 SERVICE BULLETIN 737-78-1079 REVISION 3 THRUST REVERSER PN 315A2295-702 78-31-40 FIGURE 1 ITEM 17F. UPON REMOVAL OF THE 315A2130 BLANKET INSTALLATION, VISUAL & ULTRASONIC INSPECTION OF THE 315A2102-165 BONDED PANEL ASSEMBLY, 78-31-37 FIGURE 35 ITEM 45L, REVEALS 3 AREAS OF THERMAL DEGRADATION TYPICALLY ASSOCIATED WITH AD 2012-05-02 SB’S 1079 & 1088 RESULTING IN DISBOND & DELAMINATION CT THE 165 BONDED PANEL ASSEMBLY. FURTHER VISUAL & CONDUCTIVITY INSPECTION REVEALS THE 315A2117-12 NR 2 UPPER COMPRESSION PAD IS DISCOLORED DUE TO HEAT EXPOSURE WITH CONDUCTIVITY MEASURING 45.5 % IACS OUT WITH TOLERANCE OF 38 & 42.5 % IACS. NOTE A 315A2137-2 COOLING BUSHING IS INSTALLED CT THE 165 AT NR 3 UPPER COMPRESSION PAD LOCATION. THE COOLING BUSHING IS VERIFIED TO BE 100% FREE OF BLOCKAGE.