# NTSB FTW92DPG14: Air Tractor AT-300, N4420S, Wilmont, AR, August 12, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: August 12, 1992, 10:00 local (15:00 UTC)
- Place: Wilmont, AR
- Coordinates: 33.050689, -91.570983 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=33.0507&lon=-91.5710&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report July 26, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 18315
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW92DPG14
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/18315/pdf
- Page: https://openairdocs.org/ntsb/FTW92DPG14

## Probable cause

POWER LOSS DUE TO A FAILED CRACKED CYLINDER. A FACTOR WAS THE LACK OF SUITABLE TERRAIN FOR THE FORCED LANDING.

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, takeoff - initial climb
  - engine assembly,cylinder - cracked (cause)
- Forced landing, descent - emergency
- In flight collision with terrain/water, landing
  - terrain condition - none suitable (contributing factor)

## Analysis

DURING THE INITIAL CLIMB AFTER TAKEOFF THE PILOT EXPERIENCED A TOTAL POWER LOSS DUE TO A FAILURE OF THE NUMBER THREE CYLINDER. FORCED LANDING TERRAIN IMPACT RESULTED IN DAMAGE TO THE LEFT WING SPAR AND SEPARATED THE LEFT MAIN LANDING GEAR.

## Aircraft

- Registration: [N4420S](https://openairdocs.org/deregistered/N4420S-2013-08-23), registration cancelled 2013-08-23, S/N 300-0080, built 1977 (OpenAirDocs)
- Reported make and model: AIR TRACTOR AT-300
- Registry model: [Air Tractor AT-300](https://openairdocs.org/model/air-tractor-at-300) (registry code 0390101) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 300-0080
- Airframe hours: 6825
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Wilmont Flying Service Inc.
- Registered owner: Wilmont Flying Service Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, April 9, 1992, 472 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 45; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 7,706 total, 1,890 in this make and model, 7,649 as pilot in command, 350 in the last 90 days, 145 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 360° at 9 knots
- Visibility: 5 statute miles
- Lowest ceiling: none
- Temperature: 79 °F, dew point 73 °F
- Altimeter: 30.00 inHg
- Observed at: GLH, 30 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 19920812031249A](https://openairdocs.org/incident/19920812031249A), Aug 12, 1992: Airtrc AT300, Wilmot, AR, Substantial damage. NR3 cylinder cracked and separated on climbout. Damaged gear and wing spar landing.

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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