# NTSB CHI87DEP09: Ayres 600S-2D, N4436F, Bancroft, WI, July 20, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: July 20, 1987, 09:00 local (14:00 UTC)
- Place: Bancroft, WI
- Coordinates: 44.309867, -89.510543 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.3099&lon=-89.5105&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report May 16, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 13580
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI87DEP09
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13580/pdf
- Page: https://openairdocs.org/ntsb/CHI87DEP09

## Sequence of events

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

- Airframe/component/system failure/malfunction, landing - flare/touchdown
  - landing gear,wheel - locked (cause)
  - maintenance,inspection - inadequate, company maintenance personnel (cause)
- Loss of control - on ground/water, landing - roll
  - directional control - not possible
- On ground/water collision with object, landing - roll
  - object - fence post (contributing factor)

## Analysis

ON LANDING THE AIRCRAFT VEERED TO THE RIGHT. APPLICATION OF LEFT BRAKE AND RUDDER DID NOT ARREST THE TURN. THE AIRCRAFT IMPACTED A FENCE POST RENDERING SUBSTANTIAL DAMAGE TO THE AIRCRAFT. SUBSEQUENT INVESTIGATION REVEALED AN AXLE SPACER ON THE RIGHT WHEEL WAS WORN BEYOND LIMITS. THIS PREVENTED THE WHEEL FROM TURNING.

## Aircraft

- Registration: [N4436F](https://openairdocs.org/deregistered/N4436F-2000-09-05), registration cancelled 2000-09-05, S/N 1386D (OpenAirDocs)
- Reported make and model: AYRES 600S-2D
- Registry model: [Snow 600 S-2D](https://openairdocs.org/model/snow-600-s-2d) (registry code 8380306) (OpenAirDocs)
- Category: Airplane
- Serial number: 1386D
- Airframe hours: 9646
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Farmers Flying Service, doing business as Farmers Flying Service, Inc.
- Registered owner: Farmer'S Flying Service, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, June 18, 1987, 52 hours before
- Airport: 12, Bancroft International, runway 17, 2,600 × 18 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 54; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: front; flight hours: 19,610 total, 2,000 in this make and model, 19,460 as pilot in command, 50 in the last 90 days, 6 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 190° at 5 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 82 °F, dew point 7 °F
- Altimeter: 30.00 inHg

## 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 19870720035529A](https://openairdocs.org/incident/19870720035529A), Jul 20, 1987: Ayres 600S2DRESTD, Bancroft, WI, Substantial damage. Wheel locking collar rotated and locked a wheel on landing. Aircraft veered off the runway into a fence.

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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