# NTSB DEN90LA106: Cessna 337, N2208X, Broomfield, CO, May 6, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 5, 1990, 19:31 local (May 6, 1990, 01:31 UTC)
- Place: Broomfield, CO
- Coordinates: 39.93972, -105.060119 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.9397&lon=-105.0601&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report September 21, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 17927
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN90LA106
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17927/pdf
- Page: https://openairdocs.org/ntsb/DEN90LA106

## Probable cause

THE PILOT'S FAILURE TO PROPERLY EXECUTE A PRECAUTIONARY APPROACH FOLLOWING AN ENGINE FAILURE.

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, approach - vfr pattern - downwind
- Forced landing, maneuvering - turn to landing area (emergency)
- In flight collision with terrain/water, landing

## Analysis

WHILE CONDUCTING A TEST FLT FOLLOWING OVERHAUL OF BOTH ENGINES THE REAR ENGINE FAILED WHILE ON DOWNWIND LEG. THE PLT SECURED THE ENGINE AND ATTEMPTED TO FEATHER THE PROP. THE PROP WOULD NOT FEATHER. THE PLT OVERFLEW AN AVAILABLE RUNWAY WHILE CONDUCTING A PRECAUTIONARY APPROACH AND OVERSHOT THE RUNWAY OF INTENDED LANDING. THE ACFT LANDED IN A RUNUP AREA ADJACENT TO THE RUNWAY IN A HIGH RATE OF DESCENT AND CAME TO REST IN A GRASS AREA BETWEEN THE RUNWAY AND TAXIWAY. THE ACFT SUSTAINED SUBSTANTIAL DAMAGE AND THE PLT AND PAX WERE NOT INJURED. THE ENGINE FAILED DUE TO THE OIL DILUTION LINE BEING CONNECTED TO THE PRESSURE PORT ON THE OIL PUMP INSTEAD OF THE VACUUM PORT, AND MAINTENANCE INSTRUCTIONS DO NOT PROVIDE GUIDANCE FOR THE INSTALLATION.

## Aircraft

- Registration: [N2208X](https://openairdocs.org/deregistered/N2208X-2015-05-15), registration cancelled 2015-05-15, S/N 337-0108, built 1965 (OpenAirDocs)
- Reported make and model: CESSNA 337
- Registry model: [Cessna 337](https://openairdocs.org/model/cessna-337) (registry code 2075702) (OpenAirDocs)
- Registry engine: [Continental IO-360 series](https://openairdocs.org/engine/continental-io-360-series) (registry code 17025, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 337-0108
- Airframe hours: 1749
- Engines: CONTINENTAL IO-360-CD 210 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Out And About Aviation
- Registered owner: Out 'N' About Aviation
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, May 1, 1990
- Departed: BJC
- Airport: BJC, Jefferson County, runway 29R, 9,000 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 35; private; airplane ratings: single-engine land, multi-engine land; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 485 total, 180 in this make and model, 485 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 10° at 6 knots
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 52 °F, dew point 30 °F
- Altimeter: 30.00 inHg
- Observed at: BJC, 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 19900505014039A](https://openairdocs.org/incident/19900505014039A), May 5, 1990: Cessna 337, Denver, CO, Substantial damage. Lost rear engine on downwind test flight after overhaul. Oil lines reversed. Propeller would not weather.

## Other investigations on N2208X (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 DEN71FTE04](https://openairdocs.org/ntsb/DEN71FTE04), May 28, 1971: Cessna 337 (N2208X), Thornton, CO, substantial damage

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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