# NTSB MKC84LA269: Rockwell S-2R, N4924X, Weiner, AR, September 5, 1984

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: September 5, 1984, 12:00 local (17:00 UTC)
- Place: Weiner, AR
- Coordinates: 35.610721, -90.899414 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.6107&lon=-90.8994&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33786
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC84LA269
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33786/pdf
- Page: https://openairdocs.org/ntsb/MKC84LA269

## 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, maneuvering - aerial application
  - engine assembly,crankshaft - failure,total (cause)
- Forced landing, descent - emergency
- In flight collision with terrain/water, landing - flare/touchdown
  - terrain condition - dirt bank/rising embankment (contributing factor)
- Nose over, landing - flare/touchdown

## Analysis

THE PLT WAS EXECUTING A TURN AROUND MANEUVER TO CONTINUE SPRAYING WHEN THE #2 CYL BROKE FREE FROM THE ENG & IT COMPLETELY SHUT DOWN. THE ACFT STRUCK THE LEVEE OF A BEAN FIELD & FLIPPED OVER, COMING TO REST IN AN INVERTED POSITION. POST CRASH EXAMINATION REVEALED THAT THE CRANKSHAFT HAD BROKEN WHERE IT HOLDS THE OUTER COUNTERWEIGHT, EFFECTIVELY SHUTTING DOWN THE ENG.

## Aircraft

- Registration: [N4924X](https://openairdocs.org/deregistered/N4924X-2009-10-26), registration cancelled 2009-10-26, S/N 2122R, built 1974 (OpenAirDocs)
- Reported make and model: Rockwell S-2R
- Registry model: [Rockwell International S-2R](https://openairdocs.org/model/rockwell-international-s-2r) (registry code 7630202) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 2122R
- Airframe hours: 2600
- Engines: P&W R-1340-AN-1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Wilburn Johnson
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, April 30, 1984, 300 hours before
- Departed: 8M2, WEINER, AR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 47; commercial; airplane ratings: single-engine land, multi-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 14,084 total, 1,200 in this make and model, 14,080 as pilot in command, 252 in the last 90 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 150° at 4 knots
- Visibility: 12 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 59 °F
- Altimeter: 30.00 inHg
- Observed at: HRO, 11 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 19840905046709A](https://openairdocs.org/incident/19840905046709A), Sep 5, 1984: Ayres S2RRESTD, Weiner, AR, Substantial damage. Lost engine cylinder during a spray run. Struck a levee on the forced landing and flipped over. Crankshaft failed.

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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