# NTSB MKC84LA148: Grumman G-164B, N6729K, Humnoke, AR, May 27, 1984

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Limited investigation · Final report
- Date: May 27, 1984, 08:50 local (13:50 UTC)
- Place: Humnoke, AR
- Coordinates: 34.540008, -91.749938 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.5400&lon=-91.7499&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33688
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC84LA148
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33688/pdf
- Page: https://openairdocs.org/ntsb/MKC84LA148

## Sequence of events

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

- Loss of control - in flight, cruise
  - flight control surfaces/attachments - undetermined (cause)
  - operation with known deficiencies in equipment - intentional, pilot in command (cause)
  - altitude - not maintained, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

PLT STATED HE NOTICED A VIBRATION IN THE ACFT ON TWO FLTS PRIOR TO THE ACCIDENT FLT. PLT FELT FORWARD PRESSURE ON THE STICK SO HE ATTEMPTED TO TRIM THE ACFT. THE ACFT NOSED FORWARD COLLIDING WITH THE TERRAIN. INSPECTION DISCLOSED NO PREIMPACT FAILURE/MALFUNCTION.

## Aircraft

- Registration: [N6729K](https://openairdocs.org/deregistered/N6729K-2013-05-01), registration cancelled 2013-05-01, S/N 440B, built 1978 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164B
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164B](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b) (registry code 3952802) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 440B
- Airframe hours: 2411
- Engines: P&W R-985 450 horsepower reciprocating
- Damage: Destroyed
- Flight: Aerial application, Part 137
- Operator: Farmers Flying Service
- Registered owner: Charles Dykes & Joe Sutherland
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, January 14, 1984, 130 hours before
- Departed: COY, AR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 27; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 880 total, 273 in this make and model, 813 as pilot in command, 77 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 7 statute miles
- Lowest ceiling: 1,200 ft overcast
- Temperature: 68 °F, dew point 61 °F
- Altimeter: 30.00 inHg
- Observed at: LIT, 28 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 19840527019219A](https://openairdocs.org/incident/19840527019219A), May 27, 1984: Scwzer G164B, Humnoke, AR, Destroyed. During return from aerial application flight, aircraft began vibration and pilot was unable to control pitch.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.