# NTSB LAX79FJA17: Bell 47D1, N234B, Pearl City, HI, October 19, 1979

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: October 19, 1979
- Place: Pearl City, HI · PEARL CITY, HI
- Location: 21.4026° N, 157.9569° W: Placed by OpenAirDocs: center of Pearl City, HI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=21.4026&lon=-157.9569&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report December 21, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 134810
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX79FJA17
- Page: https://openairdocs.org/ntsb/LAX79FJA17

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2869  79/10/19 NR.PEARL CITY,HI      BELL 47D1           CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, AGE 27, 669
        TIME - 1250                    N234B               PX-  0  0  1  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 57 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          HONOLULU,HI                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: VALVE ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - WARPED
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - DOWNWIND
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- NO 3 EXHAUST VLV,PN 19302,WARPED.
```

## Aircraft

- Registration: [N234B](https://openairdocs.org/deregistered/N234B-2012-09-04), registration cancelled 2012-09-04, S/N 175, built 1950 (OpenAirDocs)
- Reported make and model: BELL 47D1
- Registry model: [Bell 47D1](https://openairdocs.org/model/bell-47d1) (registry code 1180802) (OpenAirDocs)
- Registry engine: [Franklin 6V4 series](https://openairdocs.org/engine/franklin-6v4-series) (registry code 27033, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## 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 19791019031449A](https://openairdocs.org/incident/19791019031449A), Oct 19, 1979: Bell 47D1, Pearl City, HI, Substantial damage. Partial power loss due to warped exhaust valve. Pilot made hard autoratative landing downwind. Rotor hit tail boom.

## Other investigations on N234B (2)

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 LAX70FUD08](https://openairdocs.org/ntsb/LAX70FUD08), Mar 18, 1970: Bell 47D (N234B), Venice, CA, substantial damage
- [NTSB LAX65A0059](https://openairdocs.org/ntsb/LAX65A0059), Jan 9, 1965: Bell 47D1 (N234B), Granada Hls, CA, 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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