# NTSB FTW90LA148: WSK PZL Mielec PZL-M-18, N4609P, Carlisle, AR, July 28, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 28, 1990, 06:15 local (11:15 UTC)
- Place: Carlisle, AR
- Coordinates: 34.779552, -91.739471 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.7796&lon=-91.7395&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report October 2, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 23163
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW90LA148
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/23163/pdf
- Page: https://openairdocs.org/ntsb/FTW90LA148

## Probable cause

PILOT'S INITIATION OF THE ABORT WITH EXCESS AIRSPEED. A CONTRIBUTING FACTOR WAS THE ENGINE TACHOMETER OVERSPEED.

## Sequence of events

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

- Loss of control - on ground/water, takeoff - aborted
  - engine instruments,tachometer - overspeed (contributing factor)
  - reason for occurrence undetermined
  - aborted takeoff - attempted, pilot in command (cause)
  - airspeed - excessive, pilot in command (cause)
- Nose over, takeoff - aborted

## Analysis

THE AG PILOT, WITH AN EMPTY AIRPLANE, ON TAKEOFF ON A SHORT STRIP, SAW THE TACHOMETER OVERSPEED. HE ABORTED THE TAKEOFF BUT WAS UNABLE TO STOP ON THE ROUGH/UNEVEN SURFACE. HE SAID THAT WHEN THE END OF THE RUNWAY GOT CLOSER, THE SURFACE GOT BETTER, AND HE APPLIED FULL BRAKING ACTION, AND THE AIRPLANE FLIPPED FORWARD TO THE INVERTED POSITION. THE OWNER PUT THE TACHOMETER IN ANOTHER AIRPLANE AND IT OPERATED NORMALLY. OPERATOR OF ENGINE OVERHAUL SHOP CONTACTED MANUFACTURER FOR SPECIAL INSTRUCTIONS FOR INSPECTING FOR ENGINE OVERSPEED. MANUFACTURER REPLIED THAT ENGINE OVERSPEED NOT POSSIBLE WITH THIS ENGINE/PROPELLER COMBINATION DUE TO INTERNAL CONSTRUCTION OF PROPELLER.

## Aircraft

- Registration: [N4609P](https://openairdocs.org/deregistered/N4609P-1996-12-06), registration cancelled 1996-12-06, S/N 1Z01208 (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: 12012-08
- Airframe hours: 880
- Engines: PZL Mielec ASZ-621R-M18 967 horsepower reciprocating
- Damage: Substantial damage
- Flight: Positioning, Part 91
- Registered owner: Almond, John A. Sr.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, March 16, 1990, 430 hours before
- Departed: NONE
- Airport: Murray Airstrip

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 35; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 3,971 total, 535 in this make and model, 3,772 as pilot in command

## Weather

- Conditions: Visual (VMC), Dawn
- Wind: calm
- Visibility: 4 statute miles
- Lowest ceiling: none
- Temperature: 72 °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 19900728029019A](https://openairdocs.org/incident/19900728029019A), Jul 28, 1990: Wsk PZLM18, Carlisle, AR, Substantial damage. Believed engine overspeed on takeoff aborted hit brakes to prevent overrun and nosed over.

## Other investigations on N4609P (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 FTW95LA288](https://openairdocs.org/ntsb/FTW95LA288), Jul 11, 1995: WSK PZL Mielec PZL-M-18 (N4609P), Carlisle, AR, destroyed, 1 fatal. Probable cause: The pilot delayed pull-up from a swath run and failed to maintain clearance from the obstruction (grain elevator). A factor relating to the accident was: the pilot's use of medications that were not…

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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