# NTSB DEN90LA147: Weatherly 201B, N1255W, Center, CO, June 29, 1990

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: June 29, 1990, 09:30 local (15:30 UTC)
- Place: Center, CO
- Coordinates: 37.459644, -105.870979 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.4596&lon=-105.8710&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report November 9, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 17962
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN90LA147
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17962/pdf
- Page: https://openairdocs.org/ntsb/DEN90LA147

## Probable cause

THE PILOT'S FAILURE TO MAINTAIN FLYING SPEED, WHICH RESULTED IN A STALL AND COLLSION WITH THE GROUND.

## Sequence of events

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

- Loss of control - in flight, maneuvering - aerial application
  - airspeed - not maintained, pilot in command (cause)
  - stall - inadvertent, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - crop

## Analysis

THE COMMERCIAL PILOT MADE A PULL UP AND TURN DURING AN AERIAL APPLICATION FLIGHT. HE REPORTED THAT HE COULD NOT LEVEL THE PLANE AND THE RIGHT WING CONTACTED THE GROUND. THE PLANE CARTWHEELED, AND THE ENGINE WAS TORN OFF THE FUSELAGE. THE PILOT SAID HE THOUGHT THERE WAS SOMETHING WRONG WITH THE AILERONS, BUT AN FAA INSPECTOR COULD FIND NO EVIDENCE OF ANY MALFUNCTION.

## Aircraft

- Registration: [N1255W](https://openairdocs.org/deregistered/N1255W-1992-11-09), registration cancelled 1992-11-09, S/N 609 (OpenAirDocs)
- Reported make and model: WEATHERLY 201B
- Registry model: [Weatherly 201B](https://openairdocs.org/model/weatherly-201b) (registry code 9630408) (OpenAirDocs)
- Category: Airplane
- Serial number: 609
- Engines: P&W R-985-AN-1 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Alpine Ag, Inc
- Registered owner: Unknown
- Airport: NONE

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; flight hours: 8,970 total, 169 in this make and model, 8,950 as pilot in command, 49 in the last 90 days, 25 in the last 30 days, 8 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 330° at 4 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -0 °F

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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