# NTSB DEN84FA188: Rockwell 100-180, N4085X, Franktown, CO, June 19, 1984

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: June 19, 1984, 12:30 local (18:30 UTC)
- Place: Franktown, CO
- Coordinates: 39.380973, -104.750747 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.3810&lon=-104.7507&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16221
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN84FA188
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16221/pdf
- Page: https://openairdocs.org/ntsb/DEN84FA188

## Sequence of events

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

- Loss of control - in flight, takeoff - initial climb
  - weather condition - high density altitude (contributing factor)
  - weather condition - tailwind (contributing factor)
  - preflight planning/preparation - not performed, pilot in command (cause)
  - performance data - disregarded, pilot in command (cause)
  - aborted takeoff - not performed, pilot in command (contributing factor)
  - stall/mush - inadvertent, pilot in command (cause)
- In flight collision with object, descent - uncontrolled
  - object - tree(s)

## Analysis

THE PLT ATTEMPTED TO TAKEOFF DOWNWIND (WIND 310 DEGREES @22 KNOTS) WITH A DENSITY ALTITUDE CALCULATED TO BE 9190 FT MSL. ACCORDING TO THE ACFT MANUFACTURER, THE ACFT WOULD REQUIRE 2,535 FT FOR A GROUND RUN. RWY 17, A GRASS STRIP USED FOR THE TAKEOFF WAS 1800 FT LONG. WITNESSES STATED THAT THE ACFT BECAME AIRBORNE AND CLIMBED TO AN ALT OF 25 FT BEFORE THE RIGHT WING DIPPED AND THE ACFT DISAPPEARED OFF THE END OF THE RWY AND COLLIDED WITH TREES.

## Aircraft

- Registration: [N4085X](https://openairdocs.org/deregistered/N4085X-2013-04-17), registration cancelled 2013-04-17, S/N 5185, built 1970 (OpenAirDocs)
- Reported make and model: ROCKWELL 100-180
- Registry model: [Aero Commander 100-180](https://openairdocs.org/model/aero-commander-100-180) (registry code 0140208) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 5185
- Airframe hours: 1346
- Engines: LYCOMING O-360-A2F 180 horsepower reciprocating
- Damage: Destroyed
- Flight: Personal, Part 91
- Registered owner: Brewer H. Young, Jr.
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, July 14, 1983, 26 hours before
- Departed: FRANKTOWN, CO
- Destination: 1C08, EVERETT, CO
- Airport: Kostroski, runway 17, 1,800 × 150 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 53; commercial; airplane ratings: single-engine sea, multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; toxicology performed; flight hours: 11,287 total, 32 in this make and model, 2,540 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 320° at 22 knots
- Visibility: 50 statute miles
- Lowest ceiling: 8,000 ft broken
- Temperature: 79 °F, dew point 39 °F
- Altimeter: 30.00 inHg
- Observed at: APA, 18 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 19840619025299A](https://openairdocs.org/incident/19840619025299A), Jun 19, 1984: Slinds 100180, Franktown, CO, Destroyed. Pilot took off with a density altitude of 9190 feet. Crashed into trees at end of runway.

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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