# NTSB FTW83FA299: Aero Commander 680-F, N6139X, Norman, OK, June 28, 1983

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: June 28, 1983, 08:19 local (13:19 UTC)
- Place: Norman, OK
- Coordinates: 35.209369, -97.43917 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.2094&lon=-97.4392&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 20738
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW83FA299
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/20738/pdf
- Page: https://openairdocs.org/ntsb/FTW83FA299

## Sequence of events

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

- Loss of control - in flight, go-around (vfr)
  - reason for occurrence undetermined, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE ACFT CRASHED AFTER STARTING A GO-AROUND OR ABORTED LANDING AT NORMAL OK. THE ACFT WAS ON A X-COUNTRY FROM DALLAS TO WICHITA. THERE WAS NO RADIO COMMUNICATION WITH THE ACFT AFTER IT WAS CLEARED TO LAND. THE APPROACH LOOKED OK BUT ON SHORT FINAL THE ACFT SUDDENLY TURNED RIGHT, LEVELED THEN ENTERED A STEEP CLIMBING RIGHT TURN AND CONTINUE TO ROLL UNTIL INVERTED THEN PITCHED NOSE DOWN UNTIL CRASHING. THE PLT IN THE RIGHT SEAT HAD REPORTEDLY WORKED LATE THE NIGHT BEFORE INSTALLING WHAT APPEARED TO BE AN AUX FUEL SYSTEM IN THE CABIN. THE ACFT HAD JUST BEEN SOLD AND THE IDENTITY AND LOCATION OF THE OWNER WAS NOT ESTABLISHED. NO ONE CLAIMED THE WRECKAGE. EVIDENCE REVEALED THAT BOTH PROPELLERS WERE ROTATING AT HIGH RPM AT IMPACT. THE FIRE AFTER IMPACT BURNED MOST INTENSELY AND PERSISTANTLY IN THE CENTER OF THE CABIN WHERE THE REMAINS OF WHAT APPEARED TO BE AN AUX FUEL SYSTEM WERE FOUND. NO PRE-IMPACT MALFUNCTONS OR FAILURES WERE FOUND.

## Aircraft

- Registration: [N6139X](https://openairdocs.org/deregistered/N6139X-2013-02-25), registration cancelled 2013-02-25, S/N 680F-920-2, built 1960 (OpenAirDocs)
- Reported make and model: AERO COMMANDER 680-F
- Registry model: [Aero Commander 680-F](https://openairdocs.org/model/aero-commander-680-f) (registry code 0141606) (OpenAirDocs)
- Registry engine: [Lycoming IGSO-540-B1A](https://openairdocs.org/engine/lycoming-igso-540-b1a) (registry code 41535, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 680F-920-2
- Engines: LYCOMING IGSO-540-B1A 380 horsepower reciprocating
- Damage: Destroyed
- Fire: On-Ground
- Flight: Personal, Part 91
- Operator: 12
- Registered owner: Kansas Aircraft Corporation
- Airworthiness certificate: Standard, Normal
- Departed: DAL, DALLAS, TX
- Destination: ICT, WICHITA, KS
- Airport: OUN, Westheimer, runway 17, 3,000 × 200 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 45; private; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: left; toxicology performed

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 160° at 10 knots
- Visibility: 15 statute miles
- Lowest ceiling: 8,000 ft broken
- Altimeter: 29.00 inHg
- Observed at: OKC, 25 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 19830628027229A](https://openairdocs.org/incident/19830628027229A), Jun 28, 1983: Gulstm 680F, Norman, OK, Destroyed. Aircraft was on short final for landing when it suddenly rolled inverted and crashed. Had illegal fuel tank.

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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