# NTSB MKC84LA180: Rockwell S-2R, N4913X, Pocahontas, AR, June 16, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 16, 1984, 12:00 local (17:00 UTC)
- Place: Pocahontas, AR
- Coordinates: 36.259418, -90.959075 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=36.2594&lon=-90.9591&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33715
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC84LA180
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33715/pdf
- Page: https://openairdocs.org/ntsb/MKC84LA180

## Sequence of events

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

- Airframe/component/system failure/malfunction, maneuvering - aerial application
  - propeller system/accessories,blade - separation (cause)
  - propeller system/accessories,blade - fatigue (cause)
- Forced landing, descent - emergency
- Hard landing, landing - flare/touchdown
  - aircraft handling - not possible, pilot in command (contributing factor)

## Analysis

ABOUT 18 INCHES OF ONE PROPELLER BLADE SEPARATED IN FLIGHT. THE ACFT BEGAN TO SHAKE VIOLENTLY AND THE PLT SHUTDOWN THE ENGINE. THE AIRCRAFT CRASHED DURING THE FORCED LNDG.  METALLURGICAL EXAMINATION REVEALED FEATURES TYPICAL OF FATIQUE CRACKING OVER APROX 2/3 OF BLADE CROSS SECTION AT THE FRACTURE LOCATION.

## Aircraft

- Registration: [N4913X](https://openairdocs.org/deregistered/N4913X-2017-08-30), registration cancelled 2017-08-30, S/N 2104R, 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: 2104R
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: William Wood, doing business as Wood Aviation
- Registered owner: William Wood
- Airworthiness certificate: Special, Restricted (Special)
- Departed: POCAHONTAS, AR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; commercial; airplane ratings: multi-engine land, single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 5,000 total

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 12 knots
- Visibility: 9 statute miles
- Lowest ceiling: none
- Temperature: 90 °F, dew point 72 °F
- Altimeter: 30.00 inHg
- Observed at: JBR, 27 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 19840616027299A](https://openairdocs.org/incident/19840616027299A), Jun 16, 1984: Ayres S2RR1340REST, Pocahontas, AR, Substantial damage. Propeller blade separated in flight caused by fatigue crack. High stress area at crack during STC certification.

## Other investigations on N4913X (2)

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.

- [NTSB WPR17LA174](https://openairdocs.org/ntsb/WPR17LA174), Aug 1, 2017: Rockwell International S 2R (N4913X), Brawley, CA, substantial damage. Probable cause: The partial loss of engine power due to the overstress separation of three supercharger drive gear teeth.
- [NTSB FTW76DPG12](https://openairdocs.org/ntsb/FTW76DPG12), Jul 31, 1975: Aero Comdr 600S2R (N4913X), Augusta, AR, substantial damage

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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