# NTSB MKC86LA137: WSK PZL Mielec PZL-M-18, N4685B, Wynne, AR, July 2, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 2, 1986, 11:00 local (16:00 UTC)
- Place: Wynne, AR
- Coordinates: 35.230579, -90.779342 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.2306&lon=-90.7793&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 34202
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC86LA137
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/34202/pdf
- Page: https://openairdocs.org/ntsb/MKC86LA137

## Sequence of events

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

- Loss of control - in flight, takeoff
  - flight control surfaces/attachments - locked
  - aircraft preflight - improper, pilot in command (contributing factor)
  - inattentive, pilot in command (contributing factor)
  - removal of control/gust lock(s) - not performed, pilot in command (cause)
  - aborted takeoff - not performed, pilot in command (cause)
- In flight collision with terrain/water, takeoff
  - airspeed - not attained, pilot in command (cause)
  - directional control - not attained, pilot in command (cause)

## Analysis

THE PLT STATED THAT HE HAD BEEN FERTILIZING RICE CROPS THE MORNING PRIOR TO THE ACCIDENT FLT AND THAT THERE WAS NOTHING WRONG WITH THE ACFT. HE FURTHER STATED THAT ON THE ACCIDENT FLT HE HAD ALREADY INITIATED THE TAKEOFF ROLL, WHEN HE REALIZED THAT THE FLT CONTROLS WERE LOCKED. ACCORDING TO THE PLT, BY THE TIME HE UNLOCKED THE CONTROLS THE ACFT HAD BECOME AIRBORNE AND HAD ESTABLISHED ITSELF IN A CRITICAL ATTITUDE FROM WHICH HE COULD NOT RECOVER.

## Aircraft

- Registration: [N4685B](https://openairdocs.org/deregistered/N4685B-1995-03-01), registration cancelled 1995-03-01, S/N 1Z01210 (OpenAirDocs)
- Reported make and model: WSK PZL Mielec PZL-M-18
- Registry model: [Wsk-Pzl-Mielec PZL-M-18](https://openairdocs.org/model/wsk-pzl-mielec-pzl-m-18) (registry code 9810102) (OpenAirDocs)
- Category: Airplane
- Serial number: 1Z012-10
- Airframe hours: 1000
- Engines: WSK ASZ621R-16 967 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: William P. Hess
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, February 25, 1986, 99 hours before
- Departed: WYNNE, AR
- Destination: WYNNE, AR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 52; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; toxicology performed; flight hours: 4,573 total, 985 in this make and model, 4,373 as pilot in command, 100 in the last 90 days, 10 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 150° at 5 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 90 °F, dew point -0 °F
- Altimeter: 30.00 inHg

## 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 19860702029819A](https://openairdocs.org/incident/19860702029819A), Jul 2, 1986: Wsk PZLM18, Wynne, AR, Substantial damage. The aircraft flew into the ground after liftoff. The pilot failed to unlock the controls before takeoff.

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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