# NTSB LAX69F0027: Bell 47D1, N12512, Crona D Mar, CA, June 21, 1968

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 21, 1968
- Place: Crona D Mar, CA · CRONA D MAR, CA
- Phase of flight: [Emergency descent](https://openairdocs.org/ntsb-phases/600) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report August 8, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 109726
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX69F0027
- Page: https://openairdocs.org/ntsb/LAX69F0027

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1851  68/6/21    CRONA D MAR,CALIF   BELL 47D1           CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1000                    N12512              PX-  0  0  0  DUAL                      AGE 35, 1160 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            ALL IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - ORANGE COUNTY
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      IN FLIGHT: AUTOROTATIVE DESCENT
        PROBABLE CAUSE(S)
           MISCELLANEOUS ACTS,CONDITIONS - SIMULATED CONDITIONS
          ROTORCFT-TAIL ROTOR GRIP RETAINING BOLT.
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           ROTORCRAFT - ROTOR ASSEMBLIES: TAIL ROTOR BLADES
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
           MISCELLANEOUS ACTS,CONDITIONS - OUT OF BALANCE
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
                                  DIRECTIONAL CONTROL PROBLEM
                                  PROP/ENGINE VIBRATION
        REMARKS- TAIL ROTOR TRANSMISSION ALSO SEPARATED.
```

## Aircraft

- Registration: [N12512](https://openairdocs.org/deregistered/N12512-1998-04-10), registration cancelled 1998-04-10, S/N 6238 (OpenAirDocs)
- Reported make and model: BELL 47D1
- Registry model: [Bell 47D1](https://openairdocs.org/model/bell-47d1) (registry code 1180802) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Orange County

## Other investigations on N12512 (3)

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 LAX81FVG21](https://openairdocs.org/ntsb/LAX81FVG21), Feb 28, 1981: Bell 47D1 (N12512), Chico, CA, destroyed
- [NTSB LAX80FVG22](https://openairdocs.org/ntsb/LAX80FVG22), Mar 23, 1980: Bell 47D1 (N12512), Chico, CA, substantial damage
- [NTSB FTW67A0105](https://openairdocs.org/ntsb/FTW67A0105), Apr 24, 1967: Bell 47D1 (N12512), Irving, TX, 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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