# NTSB SEA68F0138: Piper PA-22, N3763P, Helena, MT, September 27, 1967

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: September 27, 1967
- Place: Helena, MT · HELENA, MT
- Location: 46.5955° N, 112.0187° W: Placed by OpenAirDocs: center of Helena, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.5955&lon=-112.0187&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report January 10, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 113936
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA68F0138
- Page: https://openairdocs.org/ntsb/SEA68F0138

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3903  67/9/27    HELENA,MONT         PIPER PA-22         CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 23, 189
        TIME - 0850                    N3763P              PX-  0  0  3  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 13 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - HELENA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: DESCENDING
           GEAR COLLAPSED                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: VALVE ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        FACTOR(S)
           TERRAIN - ROUGH/UNEVEN
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- NO.3 CYL EXHAUST VALVE FAILED.
```

## Aircraft

- Registration: [N3763P](https://openairdocs.org/deregistered/N3763P-2012-11-09), registration cancelled 2012-11-09, S/N 22-3487, built 1955 (OpenAirDocs)
- Reported make and model: PIPER PA-22
- Registry model: [Piper PA-22-150](https://openairdocs.org/model/piper-pa-22-150) (registry code 7102210) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Helena

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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