# NTSB NYC71FHD32: Bell 47G-4, N73943, Philadelphia, PA, December 2, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: December 2, 1970
- Place: Philadelphia, PA · PHILADELPHIA, PA
- Location: 39.9523° N, 75.1638° W: Placed by OpenAirDocs: center of Philadelphia, PA, within about 7 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.9523&lon=-75.1638&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report October 6, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 159537
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC71FHD32
- Page: https://openairdocs.org/ntsb/NYC71FHD32

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4550   70/12/2   PHILADELPHIA,PA     BELL 47G-4          CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 52, 6625
        TIME - 1105                    N73943              PX-  0  0  1  MAPPING/PHOTO             TOTAL HOURS, 955 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - PHILADELPHIA INTL
        DEPARTURE POINT             INTENDED DESTINATION
          PHILADELPHIA,PA             LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - MISCELLANEOUS: POWERPLANT FAILURE FOR UNDETERMINED REASONS
           MISCELLANEOUS - EVASIVE MANEUVER TO AVOID COLLISION
        FACTOR(S)
           TERRAIN - HIGH OBSTRUCTIONS
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- PHOTOGRAPHY MISSION. PLT HAD TO INCREASE ROTOR PITCH TO CLEAR PWR LINES. NO ENG MALFUNCTION FOUND.
```

## Aircraft

- Registration: [N73943](https://openairdocs.org/aircraft/N73943), registered now, S/N 2862 (OpenAirDocs)
- Reported make and model: BELL 47G-4
- Registry model: [Bell 47G-4](https://openairdocs.org/model/bell-47g-4) (registry code 1181030) (OpenAirDocs)
- Registry engine: [Lycoming VO-540 series](https://openairdocs.org/engine/lycoming-vo-540-series) (registry code 41534, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Philadelphia Intl

## Other investigations on N73943 (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 IAD76FIJ05](https://openairdocs.org/ntsb/IAD76FIJ05), Sep 26, 1975: Bell 47G4 (N73943), Tams Mt, WV, substantial damage
- [NTSB NYC70F0186](https://openairdocs.org/ntsb/NYC70F0186), Oct 16, 1969: Bell 47G-4 (N73943), E Providence, RI, 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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.