NTSB Identification: CHI90LA261.
The docket is stored on NTSB microfiche number 42790.
Nonscheduled 14 CFR
Accident occurred Tuesday, September 11, 1990 in MONROE, MI
Probable Cause Approval Date: 12/14/1992
Aircraft: PIPER PA-601P, registration: N321GB
Injuries: 2 Uninjured.

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

THE PILOT FELT THE AIRPLANE PULL RIGHT AT TOUCHDOWN. COMBINED USE OF FLIGHT CONTROLS, LEFT BRAKE AND DIFFERENTIAL POWER REDUCED BUT DID NOT PREVENT A DRIFT OFF THE RUNWAY. A BROKEN TORQUE LINK ON THE RIGHT MAIN LANDING GEAR SCISSORS ASSEMBLY ALLOWED THE LOWER STRUT TO TURN OUT OF ALIGNMENT, SCRUBBING THE RIGHT MAIN TIRE SIDEWAYS THROUGHOUT THE LANDING ROLL. THERE HAVE BEEN 17 SIMILAR FAILURES SINCE 1985. THE MANUFACTURER HAS USED A REDESIGNED LINK IN NEW PRODUCTION SINCE 1982 WITHOUT FAILURE. SERVICE BULLETIN 746A, ISSUED 5/86, OFFERS A LINK REPLACEMENT.

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

A FATIGUE FRACTURE OF THE TORQUE LINK ON THE RIGHT LANDING GEAR STRUT SCISSOR ASSEMBLY.

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