# NTSB CHI91DTG07: Ayres S2R, N4010H, Drayton, ND, August 7, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: August 7, 1991, 17:00 local (22:00 UTC)
- Place: Drayton, ND
- Coordinates: 48.559352, -97.170974 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=48.5594&lon=-97.1710&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report May 5, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 14876
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI91DTG07
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14876/pdf
- Page: https://openairdocs.org/ntsb/CHI91DTG07

## Probable cause

MISJUDGED CLEARANCE BY THE PILOT.  A FACTOR RELATED TO THE ACCIDENT IS OVERCONFIDENCE IN PERSONAL ABILITY.

## Sequence of events

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

- In flight collision with terrain/water, maneuvering - aerial application
  - terrain condition - crop
  - clearance - misjudged, pilot in command (cause)
  - overconfidence in personal ability, pilot in command (contributing factor)

## Analysis

THE PILOT WAS ATTEMPTING TO FLY UNDER A POWERLINE DURING AN AGRICULTURAL FLIGHT. THE PILOT BEGAN A DESCENT AND CONTINUED THE DESCENT INTO THE CROPS. THE AIRCRAFT IMPACTED THE GROUND 30 YARDS SHORT OF THE POWER LINE.

## Aircraft

- Registration: [N4010H](https://openairdocs.org/aircraft/N4010H), registered now, S/N 2527R (OpenAirDocs)
- Reported make and model: AYRES S2R
- Registry model: [Ayres S2R-600](https://openairdocs.org/model/ayres-s2r-600) (registry code 0970102) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 2527R
- Airframe hours: 3129
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Dakota Aviation, Inc.
- Registered owner: Dakota Aviation, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: 100 hour, July 16, 1991, 63 hours before
- Departed: GAF, GRAFTON, ND

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 41; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 9,000 total, 4,000 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 100° at 8 knots
- Visibility: 20 statute miles
- Lowest ceiling: 5,500 ft broken
- Temperature: 75 °F, dew point 59 °F
- Altimeter: 30.00 inHg
- Observed at: GFK, 42 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 (OpenAirDocs).

- [Accident 19910807032539A](https://openairdocs.org/incident/19910807032539A), Aug 7, 1991: Ayres S2RR1340REST, Drayton, ND, Substantial damage. Struck ground in sugar beet field while flying under wires on a spray run.

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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