# NTSB DEN91LA107: Beech J35, N643T, Tulsa, OK, August 3, 1991

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: August 2, 1991, 21:49 local (Aug 3, 1991, 02:49 UTC)
- Place: Tulsa, OK
- Coordinates: 36.189891, -95.909828 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=36.1899&lon=-95.9098&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 3 minor
- Status: Completed, report March 24, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 18119
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN91LA107
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/18119/pdf
- Page: https://openairdocs.org/ntsb/DEN91LA107

## Probable cause

THE ENGINE AILURE FOR UNDETERMINED REASONS. FACTORS WERE THE LIGHT CONDITION AND THE LACK OF SUITABLE TERRAIN.

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, approach - vfr pattern - final approach
  - reason for occurrence undetermined (cause)
- Forced landing, descent - emergency
- In flight collision with object, landing
  - stall - intentional, pilot in command
  - object - tree(s)
  - light condition - night (contributing factor)
  - terrain condition - none suitable (contributing factor)

## Analysis

THE AIRPLANE HAD JUST BECOME ESTABLISHED ON FINAL APPROACH WHEN THE ENGINE QUIT. ALL ATTEMPTS TO REGAIN POWER FAILED. THE PILOT INTENTIONALLY STALLED THE AIRPLANE INTO TREE TOPS. THE ENGINE WAS LATER FUNCTIONALLY TESTED AND PERFORMED SATISFACTORY.

## Aircraft

- Registration: [N643T](https://openairdocs.org/deregistered/N643T-2013-07-23), registration cancelled 2013-07-23, S/N D-5718, built 1958 (OpenAirDocs)
- Reported make and model: BEECH J35
- Registry model: [Beech J35](https://openairdocs.org/model/beech-j35) (registry code 1151522) (OpenAirDocs)
- Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: D-5718
- Engines: CONTINENTAL IO-470 250 horsepower reciprocating
- Damage: Destroyed
- Flight: Personal, Part 91
- Operator: Wisian, George R. & Linda B.
- Registered owner: Wisian, George R. & Linda B.
- Departed: 7F4, WAGONER, OK
- Airport: TUL, Tulsa International

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 23; commercial, flight instructor; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; flight hours: 1,060 total, 50 in this make and model, 865 as pilot in command, 250 in the last 90 days, 85 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/bright
- Wind: 190° at 10 knots
- Visibility: 15 statute miles
- Lowest ceiling: 25,000 ft broken
- Temperature: 90 °F, dew point 70 °F
- Observed at: TUL, 1 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 19910802034839A](https://openairdocs.org/incident/19910802034839A), Aug 2, 1991: Beech J35, Tulsa, OK, Destroyed. Engine sputtered and quit on final. Stalled into trees short of runway. Engine ran normal post accident.

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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