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NTSB Report
August 13, 1991 · Piper PA-25-235 · N7658Z
Roxobel, NC
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 13, 1991
Injury Outcomes
1 injury (1 minor injury)
Location
Roxobel, NC
Aircraft
Piper PA-25-235
Tail Number
N7658Z
Operator
Newsome John S & Katherine A
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
ATL91LA157
THE AG PILOT WAS SETTING UP FOR AERIAL APPLICATION PASS WHEN THE ENGINE QUIT SUDDENLY. UNABLE TO GLIDE TO A CLEARED AREA, HE FORCE LANDED IN A WOODED AREA. THE ENGINE WAS EXAMINED FOLLOWING THE ACCIDENT. THE INVESTIGATION REVEALED THAT AN IMPULSE COUPLING STOP PIN FROM THE LEFT MAGNETO HAD FAILED. THE MAGNETO SUBSEQUENTLY JAMMED, AND THE TEETH OF THE MAGNETO DRIVE GEAR IN THE ENGINE WERE SHEARED OFF. THIS RENDERED BOTH MAGNETOS INOPERATIVE, RESULTING IN THE ENGINE STOPPAGE.
NTSB Probable Cause
THE FAILURE OF THE LEFT MAGNETO STOP PIN, RESULTING IN THE SEIZURE OF THE MAGNETO AND THE FAILURE OF THE MAGNETO DRIVE GEAR, AND ULTIMATELY ENGINE STOPPAGE. A FACTOR IN THIS ACCIDENT WAS: THE PRESENCE OF TREES AT THE FORCED LANDING AREA.
Full Narrative
THE AG PILOT WAS SETTING UP FOR AERIAL APPLICATION PASS WHEN THE ENGINE QUIT SUDDENLY. UNABLE TO GLIDE TO A CLEARED AREA, HE FORCE LANDED IN A WOODED AREA. THE ENGINE WAS EXAMINED FOLLOWING THE ACCIDENT. THE INVESTIGATION REVEALED THAT AN IMPULSE COUPLING STOP PIN FROM THE LEFT MAGNETO HAD FAILED. THE MAGNETO SUBSEQUENTLY JAMMED, AND THE TEETH OF THE MAGNETO DRIVE GEAR IN THE ENGINE WERE SHEARED OFF. THIS RENDERED BOTH MAGNETOS INOPERATIVE, RESULTING IN THE ENGINE STOPPAGE.
Flight
Event TypeAccident
Event Time13:00 EDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftPiper PA-25-235
Tail NumberN7658Z
Aircraft CategoryAir
DamageSubstantial
OperatorNewsome John S & Katherine A
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-540-B2B5 · Reciprocating · 235
Seats1
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 39 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind320° @ 7 kt
Visibility6 sm
CeilingNone
Temperature / Dew Point61 F
Altimeter30.00 inHg
Observation Time17:50
Weather SourceWFAC