# NTSB MKC90LA067: Grumman AG-CAT G-164A, N5336, Parkin, AR, March 17, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 17, 1990, 13:00 local (19:00 UTC)
- Place: Parkin, AR
- Coordinates: 35.259288, -90.550003 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.2593&lon=-90.5500&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 21, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 34944
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC90LA067
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/34944/pdf
- Page: https://openairdocs.org/ntsb/MKC90LA067

## Probable cause

TOTAL FAILURE OF THE ENGINE'S MASTER CONNECTING ROD.

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, maneuvering - aerial application
- Forced landing, descent - emergency
- Nose over, landing

## Analysis

WHILE CONDUCTING AN AERIAL APPLICATION OPERATION, THE COMMERCIAL PILOT SAID THAT THE ENGINE FAILED. AN EMERGENCY LANDING WAS ATTEMPTED IN A SOFT, MUDDY FARM FIELD RESULTING IN A NOSE OVER. POST ACCIDENT INVESTIGATION REVEALED THAT THE ENGINE'S MASTER CONNECTING ROD HAD FAILED.

## Aircraft

- Registration: [N5336](https://openairdocs.org/deregistered/N5336-2014-10-27), registration cancelled 2014-10-27, S/N 663, built 1969 (OpenAirDocs)
- Reported make and model: GRUMMAN AG-CAT G-164A (AG-CAT G-1)
- Registry model: [Grumman G-164A](https://openairdocs.org/model/grumman-g-164a) (registry code 3952704) (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: 663
- Engines: P&W R-985-AN1 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Skyhawk Company
- Registered owner: Skyhawk Co.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, January 8, 1990, 30 hours before
- Departed: NONE, PARKIN, AR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 55; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 16,000 total, 1,500 in this make and model, 16,000 as pilot in command, 50 in the last 90 days, 50 in the last 30 days, 10 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 260° at 15 knots
- Visibility: 5 statute miles
- Lowest ceiling: none
- Temperature: 64 °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 19900317007979A](https://openairdocs.org/incident/19900317007979A), Mar 17, 1990: Scwzer G164A, Parkin, AR, Substantial damage. Connecting rod failed during spray run. Engine quit. Nosed over in soft field on the forced landing.

## Other investigations on N5336 (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 FTW91DPG03](https://openairdocs.org/ntsb/FTW91DPG03), Apr 2, 1991: Grumman G-164A (N5336), Earle, AR, substantial damage. Probable cause: A POWER LOSS FOR UNDETRMINED REASONS. A FACTOR WAS THE MUDDY/SOFT TERRAIN IN WHICH THE FORCED LANDING WAS PERFORMED.

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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