# Accident 20170410002289A: Weatherly Aviation Co Inc 620B, Lewistown, MT, April 10, 2017

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: April 10, 2017, 17:00 local time
- Place: Lewistown, MT
- Airport: Lewistown
- Damage: Substantial damage
- Phase of flight: Maneuver
- Operating rules: Agricultural (Part 137)
- Operator: 5KSG
- Location: 47.0336° N, 109.4633° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=47.0336&lon=-109.4633&mi=10
- Aircraft: N9004M, a cancelled registration (https://openairdocs.org/deregistered/N9004M-2019-12-17) (OpenAirDocs)
- Registry model: Weatherly 620B (registry code 9630605, https://openairdocs.org/model/weatherly-620b) (OpenAirDocs)
- Registry engine: Pratt & Whitney R-985 series (registry code 52008, https://openairdocs.org/engine/pratt-whitney-r-985-series) (OpenAirDocs)
- Reported make and model: WEATHERLY AVIATION CO INC 620B
- Reported engine: P&W R-985 SERIES
- People aboard: 1
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Commercial pilot, private pilot
- Pilot flight hours: 2,601 total, 558 in this make and model, 90 in the last 90 days
- NTSB investigation: [NTSB GAA17CA225](https://openairdocs.org/ntsb/GAA17CA225) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20170410002289A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

ON APRIL 10, 2017, AT 1700 MDT, A WEATHERLY 620B, N9004M, REGISTERED TO

SKYLINE AVIATION LLC, COLLIDED WITH THE GROUND  AT LEWISTOWN  AIRPORT, LEWISTOWN, MONTANA, WHILE MAKING A PRACTICE SPRAY RUN FLIGHT. VISUAL METEOROLOGICAL CONDITIONS PREVAILED AT THE TIME, AND A VFR FLIGHT PLAN WAS NOT FILED. THE AIRCRAFT WAS SUBSTANTIALLY DAMAGED, AND THE COMERCIAL RATED PILOT WERE NOT INJURED. THE FLIGHT ORIGINATED AT LEWISTOWN,

MONTANA, ON APRIL 10, 2017, AT 1645 MST.

## The NTSB's investigation of this event (1)

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.

- [NTSB GAA17CA225](https://openairdocs.org/ntsb/GAA17CA225), Apr 10, 2017: Weatherly 620B (N9004M), Lewistown, MT, substantial damage. Probable cause: The pilot’s failure to maintain altitude during low-altitude maneuvers in flat light conditions.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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