As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION FOR CRACKS ON THE RIB FLANGES OF THE HORIZONTAL STABILIZER ASSY, RIB WAS FOUND CRACKED (ALONG WITH 8 OTHER RIBS; EACH RIB FAILURE IS DOCUMENTED ON SEPARATE SDR FORMS) ON THE LOWER FLANGE AT LT HORIZTONAL CANTED STATION 29.92, BETWEEN THE FWD AND AFT SPARS. CRACKS EMANATE FROM THE FASTENER HOLES. RIB REPLACED IAW 128-6200-001.