What was found
DURING HEAVY CHECK, FWD FLANGE ON RT HORIZONTAL STABILIZER, RIB 11A IS CRACKED AT LAST RIVET. MX REPAIRED CRACKED RIB 11A FWD LOWER FLANGE IAW ETD 2014-170-017791, REV A DATED MARCH 7,2014 SEE CONTINUATION CARDS C1,C2 FOR ALL WORK PERFORMED ISSUED DMI 467748/1 FOR PERMANENT REPAIR INSPECTION TASK 55-10-018-0001 INTERNAL DET THRESHOLD OF 20000 F/C, INTERVAL OF 20000 F/C COUNTED SINCE NEW FCBS 55-10-00-005.