# NTSB NYC75AN108: Bell 47J-2A, N1140W, Philadelphia, PA, May 20, 1975

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: May 20, 1975
- 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: Serious injuries
- Injuries: 2 serious, 1 minor
- Status: Completed, report July 28, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 149292
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC75AN108
- Page: https://openairdocs.org/ntsb/NYC75AN108

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1691  75/5/20    PHILADELPHIA,PA     BELL 47J-2A         CR-  0  1  0  MISCELLANEOUS             COMMERCIAL, AGE 30, 1187
        TIME - 1045                    N1140W              PX-  0  1  1  HIGHWAY TRAFFIC ADVISORY  TOTAL HOURS, 55 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT 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)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE INSPECTION OF AIRCRAFT (MAINTENANCE PERSONNEL)
           POWERPLANT - ENGINE STRUCTURE: VALVE ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY INSTALLED
           PILOT IN COMMAND - IMPROPER LEVEL OFF
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- VALVE ROCKER SHAFT RETAINING PLATE NOT INSTALLED NR 6 CYL.ROCKER ARM SHAFT DISPLACED.
```

## Aircraft

- Registration: [N1140W](https://openairdocs.org/deregistered/N1140W-1977-07-06), registration cancelled 1977-07-06, S/N 3118 (OpenAirDocs)
- Reported make and model: BELL 47J-2A
- Registry model: [Bell 47J-2A](https://openairdocs.org/model/bell-47j-2a) (registry code 1181106) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Philadelphia Intl

## 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 19750520020229A](https://openairdocs.org/incident/19750520020229A), May 20, 1975: Bell 47J2A, Philadelphia, PA, Substantial damage. Valve rocker shaft retaining plate not installed nr 6 cyl. Rocker arm shaft displaced.

## Other investigations on N1140W (1)

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 NYC68D0427](https://openairdocs.org/ntsb/NYC68D0427), Apr 3, 1968: Bell 47J-2A (N1140W), Concord Twp, PA, 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.