# NTSB MKC72DER36: Piper PA-12, N7644H, Silver Bay, MN, February 5, 1972

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: February 5, 1972
- Place: Silver Bay, MN · SILVER BAY, MN
- Location: 47.2933° N, 91.2768° W: Placed by OpenAirDocs: center of Silver Bay, MN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=47.2933&lon=-91.2768&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report November 1, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 165014
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC72DER36
- Page: https://openairdocs.org/ntsb/MKC72DER36

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0600   72/2/5    SILVER BAY,MINN     PIPER PA-12         CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, FL.INSTR.,
        TIME - 1315                    N7644H              PX-  0  0  2  PLEASURE/PERSONAL TRANSP  AGE 35, 522 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            193 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - SILVER BAY
        DEPARTURE POINT             INTENDED DESTINATION
          LAX LAKE,MINN               LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GEAR COLLAPSED                                           TAKEOFF: RUN
        PROBABLE CAUSE(S)
           AIRFRAME - LANDING GEAR: MAIN GEAR-SHOCK ABSORBING ASSY,STRUTS,ATTACHMENTS,ETC.
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           MISCELLANEOUS ACTS,CONDITIONS - PREVIOUS DAMAGE
        REMARKS- STRUT BREAK AREA INDICATED HARD LDG OR OPERATION OFF ROUGH TERRAIN.SKI MOD.TKOF FRM SNW CVRD LAKE.
```

## Aircraft

- Registration: [N7644H](https://openairdocs.org/aircraft/N7644H), registered now, S/N 12-522 (OpenAirDocs)
- Reported make and model: PIPER PA-12
- Registry model: [Piper PA-12](https://openairdocs.org/model/piper-pa-12) (registry code 7101202) (OpenAirDocs)
- Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Silver Bay

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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