# NTSB MKC68F0393: Beech A23, N4726J, Askov, MN, November 26, 1967

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: November 26, 1967
- Place: Askov, MN · ASKOV, MN
- Location: 46.1886° N, 92.7824° W: Placed by OpenAirDocs: center of Askov, MN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.1886&lon=-92.7824&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 3 serious, 1 minor
- Status: Completed
- Report: Brief approved by the director
- NTSB case key (mKey): 113583
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC68F0393
- Page: https://openairdocs.org/ntsb/MKC68F0393

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0991  67/11/26   ASKOV,MINN          BEECH A23           CR-  0  1  0  NONCOMMERCIAL             PRIVATE, AGE 38, 154
        TIME - 0920                    N4726J              PX-  0  2  1  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 1 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            LANDING: GO-AROUND
           STALL: MUSH                                              LANDING: GO-AROUND
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: VALVE ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER CLEARANCE-TOLERANCE
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        FACTOR(S)
           PILOT IN COMMAND - LACK OF FAMILIARITY WITH AIRCRAFT
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED MECHANICAL DISCREPANCY
        REMARKS- NO COMPRESSION ON NO 3 CYL,DUE TO DEFORMED VALVE NOT SEATING PROPERLY.
```

## Aircraft

- Registration: [N4726J](https://openairdocs.org/aircraft/N4726J), registered now, S/N MA-158, built 1966 (OpenAirDocs)
- Reported make and model: BEECH A23
- Registry model: [Beech A23-24](https://openairdocs.org/model/beech-a23-24) (registry code 1151226) (OpenAirDocs)
- Registry engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N4726J (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 MKC68F0094](https://openairdocs.org/ntsb/MKC68F0094), Jul 15, 1967: Beech A23 (N4726J), Duluth, MN, 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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