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NTSB Report
September 11, 1990 · Piper PA-601P · N321GB
Monroe, MI
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 11, 1990
Injury Outcomes
No injuries (2 uninjured)
Location
Monroe, MI
Aircraft
Piper PA-601P
Tail Number
N321GB
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI90LA261
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.
NTSB Probable Cause
A FATIGUE FRACTURE OF THE TORQUE LINK ON THE RIGHT LANDING GEAR STRUT SCISSOR ASSEMBLY.
Full Narrative
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.
Flight
Event TypeAccident
Event Time06:15 EDT
Nearest AirportCUSTER (0nm N)
Runway21
Runway Length5000 ft
Runway Width100 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftPiper PA-601P
Tail NumberN321GB
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 135
Engines2
Engine TypeReciprocating
Engine DetailsLycoming · IO-540-S1A5 · Reciprocating · 290
Seats6
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 24 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind30° @ 9 kt
Visibility7 sm
CeilingOvercast 2300 ft
Temperature / Dew Point64 F / 55
Altimeter30.00 inHg
Observation Time09:55
Weather SourceWFAC