Cessna 414 accident near Cheyenne, Wyoming, October 23, 1984
On October 23, 1984 at about 4:16 pm local time, a Cessna 414, registered N1569T, was substantially damaged in an accident near Cheyenne, Wyoming (Cheyenne airport). It was a business flight under general aviation rules (Part 91). 1 person was seriously injured. The weather was instrument conditions (cloud, fog or low visibility).
The NTSB's probable cause their words, unchanged
The NTSB has not yet published a probable cause for this accident. Investigations usually take one to two years; this page updates when the final report is released.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- October 23, 1984 · about 4:16 pm local time
- Place
- Cheyenne, Wyoming · Cheyenne · map
- Type
- Accident
- Injuries
- 1 person was seriously injured.
- Weather
- instrument conditions (cloud, fog or low visibility)
- Aircraft
- Cessna 414 · all 414s on the register
- Registration
- N1569T · no longer on the register · serial 414-0478
- Damage
- Substantial damage
- Flight
- Business flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
THE ACFT COLLIDED WITH THE GROUND DURING A TURN TO FINAL FROM A CIRCLING APPROACH (IFR) AT CHEYENNE AIRPORT. ACCORDING TO ATC, THE ACFT WAS A VFR 'POP UP' & WAS SUBSEQUENTLY ISSUED AN IFR CLEARANCE FOR AN APPROACH INTO THE AIRPORT. EXAMINATION OF THE ACFT AT THE WRECKAGE SITE REVEALED A BUILD-UP OF MIXED RIME & CLEAR ICE ON THE ENG.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
Pilot
- Certificate: commercial pilot
- Ratings: multi-engine land; single-engine land; instructor: airplane multi-engine; instructor: instrument airplane; instrument: airplane
- Flight time: 2,838 hours in all; 28 in this make and model; 235 in the last 90 days
- Medical certificate: Class 2 (valid medical--w/ waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 6,200 hours
- Last inspection: annual inspection, September 17, 1984; 14 hours since
- Maximum gross weight: 6,500 lb
- Seats: 8
- Landing gear: retractable
- Engine: Lycoming TSIO-520NBCJ (piston); 0 hours total
The flight
- Departed from: RAP Rapid City SD at 4:00 pm
- Destination: CYS Cheyenne WY
- Flight plan: VFR
- Runway 34, 4,997 ft by 150 ft
Weather at the time
- Light: daylight
- Wind: from 140° at 8 knots
- Visibility: 1 statute miles
- Sky: broken clouds at 300 ft; not recorded
- Temperature: 28°F (-2°C), dew point 30°F (-1°C)
- Altimeter: 30.00 inHg
- Observation at 3:21 pm from CYS
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.