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NTSB Report
April 5, 1987 · Air Tractor AT-301 · N23069
Conrad, MT
Overview
Report Status
Preliminary report
Event Type
Accident
Date
April 5, 1987
Injury Outcomes
No injuries (1 uninjured)
Location
Conrad, MT
Aircraft
Air Tractor AT-301
Tail Number
N23069
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN87LA084
AN AG PLT WAS RETURNING FROM AN AERIAL APPLICATION. SIX MILES FROM THE DESTINATION ARPT THE ENGINE QUIT. THE PLT ATTEMPTED TO LAND ON A ROAD BUT THE ACFT STRUCK THE EDGE OF A PIT, SPUN ACROSS THE ROAD AND CAME TO REST FACING 180 DEGREES FROM THE ORIGINAL HEADING. ENGINE EXAMINATION DISCLOSED SUPERCHARGER IMPELLER DAMAGE TYPICAL OF FOREIGN OBJECT INGESTION. FIVE OF THE NINE CYLINDERS HAD LOW COMPRESSION AND SHOWED METAL PARTICLES ON PISTON AND VALVE SURFACES. THE LEFT MAGNETO HAD BRASS, COPPER, AND ALUMINUM PARTICLES THROUGHOUT THE INTERIOR AND FAILED TO PRODUCE SPARK WHEN ROTATED. THE RIGHT MAGNETO DID PRODUCE SPARK WHEN ROTATED BUT THREE OF THE NINE PLUGS SERVED BY THIS MAGNETO WERE METAL FOULED IN THE ELECTRODES.
Full Narrative
AN AG PLT WAS RETURNING FROM AN AERIAL APPLICATION. SIX MILES FROM THE DESTINATION ARPT THE ENGINE QUIT. THE PLT ATTEMPTED TO LAND ON A ROAD BUT THE ACFT STRUCK THE EDGE OF A PIT, SPUN ACROSS THE ROAD AND CAME TO REST FACING 180 DEGREES FROM THE ORIGINAL HEADING. ENGINE EXAMINATION DISCLOSED SUPERCHARGER IMPELLER DAMAGE TYPICAL OF FOREIGN OBJECT INGESTION. FIVE OF THE NINE CYLINDERS HAD LOW COMPRESSION AND SHOWED METAL PARTICLES ON PISTON AND VALVE SURFACES. THE LEFT MAGNETO HAD BRASS, COPPER, AND ALUMINUM PARTICLES THROUGHOUT THE INTERIOR AND FAILED TO PRODUCE SPARK WHEN ROTATED. THE RIGHT MAGNETO DID PRODUCE SPARK WHEN ROTATED BUT THREE OF THE NINE PLUGS SERVED BY THIS MAGNETO WERE METAL FOULED IN THE ELECTRODES.
Flight
Event TypeAccident
Event Time15:00 MDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAir Tractor AT-301
Tail NumberN23069
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsP&W · R-1340-AN-1 · Reciprocating · 600
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 27 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility40 sm
CeilingNone
Temperature / Dew Point63 F / 37 C
Altimeter29.00 inHg
Observation Time20:50
Weather SourceWFAC