# NTSB MKC90LA129: Rockwell S2R, N8421V, Tilton, AR, June 15, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 14, 1990, 19:00 local (Jun 15, 1990, 00:00 UTC)
- Place: Tilton, AR
- Coordinates: 35.400939, -90.990478 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.4009&lon=-90.9905&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 29, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 35000
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC90LA129
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/35000/pdf
- Page: https://openairdocs.org/ntsb/MKC90LA129

## Probable cause

FAILURE OF THE ENGINE BLOWER(SUPERCHARGER).  RELATED TO THE ACCIDENT WAS THE SOFT/WET TERRAIN, WHERE THE FORCED LANDING WAS PERFORMED.

## 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
  - eng assembly,blower/impeller/integral supercharger - failure,total (cause)
- Forced landing, descent - emergency
  - load jettison - performed, pilot in command
- In flight collision with terrain/water, landing
  - terrain condition - wet (contributing factor)
  - terrain condition - soft (contributing factor)

## Analysis

THE COMMERCIAL PLT SAID THAT WHILE EN ROUTE TO THE FIELD TO BE TREATED, THE ENGINE BEGAN TO LOSE POWER. AN EMERGENCY LNDG WAS MADE IN A SOFT, WET, FARM FIELD, WHICH RESULTED IN SUBSTANTIAL DAMAGE TO THE ACFT. POST-ACCIDENT INVESTIGATION REVEALED THE ENGINE DRIVEN SUPERCHARGER HAD FAILED.

## Aircraft

- Registration: [N8421V](https://openairdocs.org/aircraft/N8421V), registered now, S/N 2181R (OpenAirDocs)
- Reported make and model: Rockwell S2R
- 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: 2181R
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Cartillar Flying Service
- Airworthiness certificate: Special, Restricted (Special)
- Departed: HICKORY RIDGE, AR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 25; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 2,500 total, 1,000 in this make and model, 2,400 as pilot in command, 300 in the last 90 days, 175 in the last 30 days, 12 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 360° at 5 knots
- Visibility: 5 statute miles
- Lowest ceiling: none
- Temperature: 90 °F, dew point -0 °F

## 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 19900614021239A](https://openairdocs.org/incident/19900614021239A), Jun 14, 1990: Ayres S2RR1340REST, Tilton, AR, Substantial damage. En route to spray field, engine quit. Landed soft wet field. Engine driven supercharer failed.

## Other investigations on N8421V (1)

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 CEN12LA357](https://openairdocs.org/ntsb/CEN12LA357), May 23, 2012: Rockwell International S-2R (N8421V), Howard, SD, substantial damage. Probable cause: A fractured fabricated aluminum oil line, which resulted in oil exhaustion followed by a forced 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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