What was found
WHEN PILOT SELECTED GEAR DOWN, HE HEARD A POP/BANG UNDER THE FLOOR AND THE MAIN GEAR FAILED TO EXTEND. ACFT WAS LANDED GEAR UP WITH MINIMAL AIRFRAME DAMAGE. INVEST REVEALED MAIN GEAR ACTUATOR ROD END BEARING PN S2049-6FG HAD FAILED AND SPLIT APART AT THE SPHERICAL END. FAILURE APPEARS TO HAVE STARTED AT THE HOLE IN THE ROD END USED FOR GREASING. AREA INSP APPROX 8 HRS PRIOR, DURING ANNUAL, WITH NO VISUAL DEFECTS. FOUND OLD CESSNA SI LETTER SE79-37 RECOMMENDING ROD END REPLACEMENT WITH PN S2426-6, WHICH IS NOW SUPERCEDED TO PN S3469-1. NEW P/N IS A SEALED UNIT WITH NO GREASER HOLE. SUBMITTER RECOMMENDED CESSNA RE-ADDRESS THIS AS A SERVICE BULLETIN WITH HIGHER PRIORITY. (X)