- Date
- April 5, 1987, 14:00 local (21:00 UTC)
- Place
- Conrad, MT
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N23069Air Tractor AT-301
- Weather
- Visual (VMC) · Day
- Status
- Completed · report May 19, 1989
- Report
- Approved by Office Director
- FAA report
- 19870405008359A
- Case key
- 17190
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
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.
Aircraft
- Registration
- N23069
- Reported as
- Air Tractor AT-301
- Category
- Airplane
- Serial number
- 301-0350
- Airframe hours
- 1,095
- Engine
- P&W R-1340-AN-1, 600 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Aerial application · Part 137
- Registered owner
- Mark G. Mamuzich
- Airworthiness certificate
- Special, Restricted (Special)
- Last inspection
- Annual · March 1, 1987 · 12 hours before
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 27
- Certificate
- Commercial
- Airplane ratings
- Multi-engine land, Single-engine land
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Front
- Flight hours
- 2,404 total · 934 in this make and model · 1,627 as pilot in command · 21 in the last 90 days · 2 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- Calm
- Visibility
- 40 statute miles
- Lowest ceiling
- None
- Temperature
- 63 °F, dew point 37 °F
- Altimeter
- 29.00 inHg
- Observed at
- CTB, 28 nm away
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N23069 · 3
Matched to the same aircraft by N-number and date.