# NTSB CHI77FEM05: Beech B23, N721RT, Ironwood, MI, October 1, 1976

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: October 1, 1976
- Place: Ironwood, MI · IRONWOOD, MI
- Location: 46.4522° N, 90.1504° W: Placed by OpenAirDocs: center of Ironwood, MI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.4522&lon=-90.1504&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 13, 1976
- Report: Brief approved by the director
- NTSB case key (mKey): 155653
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI77FEM05
- Page: https://openairdocs.org/ntsb/CHI77FEM05

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3347   76/10/1   IRONWOOD,MI         BEECH B23           CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 47, 198
        TIME - 1146                    N721RT              PX-  0  0  3  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, ALL IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - GOGEBIC CO
        DEPARTURE POINT             INTENDED DESTINATION
          ANOKA,MN                    HANCOCK,MI
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           GEAR COLLAPSED                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: VALVE ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           AIRPORTS/AIRWAYS/FACILITIES - AIRPORT CONDITIONS: HIDDEN HAZARD
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- NR 1 CYL HEAD OF EX VALVE BROKEN. NOSE GR STRUCK RIDGE IN GRASS AREA.
```

## Aircraft

- Registration: [N721RT](https://openairdocs.org/aircraft/N721RT), registered now, S/N M-1170, built 1968 (OpenAirDocs)
- Reported make and model: BEECH B23
- Registry model: [Beech B23](https://openairdocs.org/model/beech-b23) (registry code 1151240) (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
- Airport: Gogebic Co

## 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 19761001033089A](https://openairdocs.org/incident/19761001033089A), Oct 1, 1976: Beech B23BEECH, Ironwood, MI, Substantial damage. Nr 1 cyl head of ex valve broken. Nose gr struck ridge in grass area.

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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