NTSB Identification: ATL89IA104.
The docket is stored on NTSB microfiche number 39214.
Incident occurred Tuesday, March 14, 1989 in SAVANNAH, GA
Probable Cause Approval Date: 08/26/1992
Aircraft: CESSNA 177RG, registration: N52800
Injuries: 4 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

THE AIRPLANE LANDED GEAR-UP AFTER THE PLT WAS UNABLE TO LOWER THE GEAR USING THE NORMAL OR EMERGENCY GEAR EXTENSION SYSTEMS. EXAMINATION OF THE AIRPLANE AFTER THE MISHAP REVEALED THAT THE MLG ACTUATOR ROD END HAD FRACTURED. METALLURGICAL EXAMINATION OF THE FRACTURE SURFACE REVEALED PROGRESSIVE FATIGUE CRACKING THROUGH THE THREADED SHANK. IN 1979, CESSNA HAD ISSUED A SERVICE LETTER RECOMMENDING THE REPLACEMENT OF THIS P/N ROD END WITH A NEW, HIGH-STRENGTH ROD END. COMPLIANCE WITH THE SERVICE LETTER WAS NOT MANDATORY. EXAMINATION OF SDR'S FROM 1983 TO 1989 REVEALED NO HISTORY OF SIMILAR FAILURES INVOLVING THE OLD P/N ROD END.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

FATIGUE-INDUCED FRACTURE OF THE MAIN LANDING GEAR ACTUATOR ROD END.

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