# NTSB MIA90LA149: Rockwell S-2R, N8464V, Crowder, MS, July 9, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 9, 1990, 16:00 local (21:00 UTC)
- Place: Crowder, MS
- Coordinates: 34.17028, -90.13002 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.1703&lon=-90.1300&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report October 2, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 32676
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA90LA149
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/32676/pdf
- Page: https://openairdocs.org/ntsb/MIA90LA149

## Probable cause

FATIGUE FAILURE OF A BOLT WHICH SECURES THE MIXTURE AND THROTTLE BELLCRANKS TO THE BELLCRANK SUPPORT ASSEMBLY.

## Sequence of events

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

- Airframe/component/system failure/malfunction, approach - vfr pattern - final approach
  - throttle/power lever,bellcrank - failure,total (cause)
  - throttle/power control - not possible, pilot in command (cause)
  - mixture control,bellcrank - failure,total
- Undershoot, landing - flare/touchdown
  - proper touchdown point - not possible, pilot in command
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - ditch
- Fire/explosion, landing - roll

## Analysis

WHILE ON FINAL APCH, THE PLT ADDED POWER BUT THE ENG DID NOT RESPOND. AFTER TOUCHDOWN IN A FIELD SHORT OF THE RWY. THE LT MAIN LANDING GEAR SEPARATED & PUNCTURED THE FUEL TANK. THE ACFT WAS DESTROYED BY FIRE. EXAM OF THE ENG COMPARTMENT REVEALED THAT A BOLT WHICH SECURES THE MIXTURE & THROTTLE BELLCRANKS TO THE BELLCRANK SUPPORT ASSY, FAILED DUE TO FATIGUE. THIS PREVENTED THROTTLE CONTROL INPUT IN THE COCKPIT FROM ACTIVATING THE CARBURETOR.

## Aircraft

- Registration: [N8464V](https://openairdocs.org/deregistered/N8464V-1991-08-02), registration cancelled 1991-08-02, S/N 2378R (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)
- Category: Airplane
- Serial number: 2378R
- Airframe hours: 5866
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Destroyed
- Fire: On-Ground
- Flight: Aerial application, Part 137
- Operator: Lambert Air, Inc.
- Registered owner: Lambert Air, Inc
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, May 20, 1990
- Departed: MMS, MARKS, MS
- Airport: NONE, runway 18, 2,600 × 15 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 7,136 total, 7,100 as pilot in command, 300 in the last 90 days, 100 in the last 30 days, 9 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 210° at 5 knots
- Visibility: 7 statute miles
- Lowest ceiling: none
- Temperature: 93 °F, dew point 73 °F
- Altimeter: 30.00 inHg
- Observed at: GWO, 42 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 19900709024829A](https://openairdocs.org/incident/19900709024829A), Jul 9, 1990: Ayres S2RR1340REST, Crowder, MS, Destroyed. Low on final for ag strip engine failed to respond. Struck a ditch short of field. Throttle bell crank bolt 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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