# NTSB DEN85LA155: Piper PA-25-235, N7346Z, Fillmore, UT, June 9, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 9, 1985, 08:00 local (14:00 UTC)
- Place: Fillmore, UT
- Coordinates: 38.960281, -112.390769 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=38.9603&lon=-112.3908&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16695
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN85LA155
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16695/pdf
- Page: https://openairdocs.org/ntsb/DEN85LA155

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(total) - mech failure/malf, maneuvering - aerial application
  - accessory drive assy,drive gear - failure,partial (cause)
  - ignition system,magneto - jammed (cause)
- Forced landing, descent - emergency
- Nose over, landing - roll
  - terrain condition - soft (contributing factor)
  - terrain condition - crop (contributing factor)

## Analysis

THE PLT REPORTED THE ENGINE FAILED WHILE HE WAS SPRAYING A CORN FIELD, NECESSITATING A STRAIGHT AHEAD FORCED LANDING. DURING THE LANDING ROLL THE WHEELS BOGGED DOWN IN THE SOFT EARTH AND THE PLANE OVERTURNED. SUBSEQUENT EXAMINATION OF THEENGINE BY THE PLT REVEALED THE DOWEL PIN ON THE MAGNETO IMPULSE COUPLER HAD BEEN SHEARED OFF BY THE MAIN CRANKSHAFT DRIVE GEAR.

## Aircraft

- Registration: [N7346Z](https://openairdocs.org/deregistered/N7346Z-2008-07-24), registration cancelled 2008-07-24, S/N 25-3297, built 1965 (OpenAirDocs)
- Reported make and model: PIPER PA-25-235
- Registry model: [Piper PA-25-235](https://openairdocs.org/model/piper-pa-25-235) (registry code 7102504) (OpenAirDocs)
- Registry engine: [Lycoming 0-540 series](https://openairdocs.org/engine/lycoming-0-540-series) (registry code 41532, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 25-3297
- Airframe hours: 3500
- Engines: LYCOMING O-540-B2B5 235 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Spanish Fork Flying Service
- Airworthiness certificate: Special, Restricted (Special)
- Departed: U19, FILLMORE, UT

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 42; commercial; airplane ratings: multi-engine land, single-engine land; medical: class 2, expired; seat: center; flight hours: 10,000 total, 5,000 in this make and model, 150 in the last 90 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 5 knots
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 70 °F

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19850609027579A](https://openairdocs.org/incident/19850609027579A), Jun 9, 1985: Piper PA25235, Fillmore, UT, Substantial damage. Engine failed while spraying field. Landed in a soft field and overturned. Dowell pin on mag impulse coupler broke.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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