# NTSB MKC67F0207: Mooney M20A, N1081B, Ottumwa, IA, August 30, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 30, 1966
- Place: Ottumwa, IA · OTTUMWA, IA
- Location: 41.0223° N, 92.4233° W: Placed by OpenAirDocs: center of Ottumwa, IA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.0223&lon=-92.4233&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report December 30, 1966
- Report: Brief approved by the director
- NTSB case key (mKey): 120779
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC67F0207
- Page: https://openairdocs.org/ntsb/MKC67F0207

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3244  66/8/30    OTTUMWA IOWA        MOONEY M20A         CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 38, 706
        TIME - 1150                    N1081B              PX-  0  0  3  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 68 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: VALVE ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - LACK OF LUBRICATION-SPECIFIC PART,NOT SYSTEM
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- EXHAUST VALVE NO.3 CYLINDER BROKEN.ROCKER BOX COVER LOOSE CAUSING LOSS OF OIL.
```

## Aircraft

- Registration: [N1081B](https://openairdocs.org/deregistered/N1081B-2011-07-01), registration cancelled 2011-07-01, S/N 1307, built 1958 (OpenAirDocs)
- Reported make and model: MOONEY M20A
- Registry model: [Mooney M20A](https://openairdocs.org/model/mooney-m20a) (registry code 5870204) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N1081B (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 CHI66F0387](https://openairdocs.org/ntsb/CHI66F0387), Oct 23, 1965: Mooney M20A (N1081B), Marion, OH, 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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