# NTSB DEN79FA019: Cessna T210, N9490M, Boulder, CO, February 3, 1979

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: February 3, 1979
- Place: Boulder, CO · BOULDER, CO
- Location: 40.0244° N, 105.2513° W: Placed by OpenAirDocs: center of Boulder, CO, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.0244&lon=-105.2513&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report August 9, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 136325
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN79FA019
- Page: https://openairdocs.org/ntsb/DEN79FA019

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2184   79/2/3  NR.BOULDER,CO         CESSNA T210         CR-  1  0  0  NONCOMMERCIAL             PRIVATE, AGE 31, 1000
        TIME - 0933                    N9490M              PX-  1  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 20 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          DENVER,CO                   GRAND JUNCTION,CO            CRAIG,CO
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: CLIMB TO CRUISE
           COLLISION WITH GROUND/WATER: CONTROLLED                  LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (OWNER PERSONNEL)
           POWERPLANT - ENGINE STRUCTURE: VALVE ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER GRADE OIL-LUBRICATING SYSTEM
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
           PILOT IN COMMAND - SELECTED UNSUITABLE TERRAIN
        FACTOR(S)
           PILOT IN COMMAND - IMPROPER STARTING PROCEDURES
           TERRAIN - ROUGH/UNEVEN
           TERRAIN - SNOW-COVERED
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- #2 EXHAUST VALVE BROKE.115HRS SINCE OIL CHANGE. 50WT OIL,SUB-ZERO TEMP.NO ENGINE PREHEAT.
```

## Aircraft

- Registration: [N9490M](https://openairdocs.org/deregistered/N9490M-2013-10-31), registration cancelled 2013-10-31, S/N 21059390, built 1970 (OpenAirDocs)
- Reported make and model: CESSNA T210
- Registry model: [Cessna T210K](https://openairdocs.org/model/cessna-t210k) (registry code 2073447) (OpenAirDocs)
- Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

## 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 19790203019919A](https://openairdocs.org/incident/19790203019919A), Feb 3, 1979: Cessna T210K, Boulder, CO, Destroyed, 1 fatal. Engine stopped enroute. Pilot misjudged landing area. Found broken valves. No cold weather preheat start. Heavy oil.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.