# NTSB DEN90LA157: Piper PA-36, N9980P, Clarkston, UT, July 12, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 12, 1990, 06:05 local (12:05 UTC)
- Place: Clarkston, UT
- Coordinates: 41.919898, -112.059928 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=41.9199&lon=-112.0599&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 9, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 17969
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN90LA157
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17969/pdf
- Page: https://openairdocs.org/ntsb/DEN90LA157

## Probable cause

JAMMED AILERONS RESULTANT FROM THE COLLISION WITH CROPS.

## Sequence of events

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

- On ground/water encounter with terrain/water, landing - aborted
  - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (cause)
  - terrain condition - crop
- Loss of control - in flight, landing - aborted
  - flight control,aileron - jammed (cause)
  - directional control - not possible, pilot in command
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE COMMERCIAL PILOT WAS LANDING ON A GRAVEL ROAD. DURING LANDING ROLL, HE SAW TALL VEGETATION AND ATTEMPTED A GO AROUND. THE RIGHT SPRAY BOOM CONTACTED THE VEGETATION AT LIFT OFF AND THE BOOM WAS STRIPPED OFF THE WING. THE PILOT SAID HE WAS IN FLIGHT, FULL POWER, WITH NO CONTROL OF THE AILERONS. THE PLANE MADE AN UNCOMMANDED LEFT BANK TO 45 DEGREES, AT WHICH POINT THE PILOT REDUCED POWER AND THE PLANE STRUCK THE TERRAIN LEFT WING FIRST. THE PLANE CARTWHEELED AND TORE THE ENGINE, COWLING AND NOSE FRAMEWORK FROM THE FUSELAGE. THE PLANE CAME TO REST FACING OPPOSITE OF THE FLIGHT PATH.

## Aircraft

- Registration: [N9980P](https://openairdocs.org/deregistered/N9980P-2013-03-21), registration cancelled 2013-03-21, S/N 36-7560093, built 1975 (OpenAirDocs)
- Reported make and model: PIPER PA-36
- Registry model: [Piper PA-36-285](https://openairdocs.org/model/piper-pa-36-285) (registry code 7103610) (OpenAirDocs)
- Registry engine: [Lycoming IO-720 series](https://openairdocs.org/engine/lycoming-io-720-series) (registry code 41546, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 36-7560093
- Engines: LYCOMING IO-720-A1B 400 horsepower reciprocating
- Damage: Substantial damage
- Flight: Positioning, Part 137
- Operator: Larsen, Wayne C.
- Registered owner: Unknown
- Departed: U27, TREMONTON, UT
- Destination: NONE
- Airport: NONE

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 38; flight instructor, commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; flight hours: 8,543 total, 3,513 in this make and model, 8,423 as pilot in command, 209 in the last 90 days, 80 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -0 °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 19900712025499A](https://openairdocs.org/incident/19900712025499A), Jul 12, 1990: Piper PA36285, Clarkston, UT, Substantial damage. Spray boom caught in tall wheat on go around from a gravel strip. Lost control aborted. Wing hit. Caused cartwheel.

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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