# NTSB NYC70AN096: Dehavilland DHC-6, N121PM, Windsor Lock, CT, March 6, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: March 6, 1970
- Place: Windsor Lock, CT · WINDSOR LOCK, CT
- Location: 41.9293° N, 72.6273° W: Placed by OpenAirDocs: center of Windsor Locks, CT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.9293&lon=-72.6273&mi=10
- Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report June 17, 1970
- Report: Brief approved by the director
- NTSB case key (mKey): 139393
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC70AN096
- Page: https://openairdocs.org/ntsb/NYC70AN096

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0165   70/3/6    WINDSOR LOCK,CONN   DEHAVILLAND DHC-6   CR-  0  0  2  COMMERCIAL                COMMERCIAL, AGE 28, 4022
        TIME - 2213                    N121PM              PX-  0  0  0  AIR TAXI-PASSG            TOTAL HOURS, 2503 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, INSTRUMENT RATED.
        NAME OF AIRPORT - BRADLEY
        DEPARTURE POINT             INTENDED DESTINATION
          WINDSOR LOCK,CONN           NEW HAVEN,CONN
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/JET/ROTOR BLAST                                STATIC: PARKED-ENGINES NOT OPERATING
           COLLISION WITH GROUND/WATER: UNCONTROLLED                TAKEOFF: INITIAL CLIMB
        PROBABLE CAUSE(S)
           MISCELLANEOUS - PROP/JET/ROTOR BLAST
           PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING
           MISCELLANEOUS ACTS,CONDITIONS - PREVIOUS DAMAGE
        FACTOR(S)
           PERSONNEL - AIRPORT SUPERVISORY PERSONNEL: IMPROPER OPERATION OF FACILITIES
        REMARKS- JET BLAST DAMAGED LOWER RUDDER TRIM TAB,ELEVATOR PUSH ROD ASSY.LOST CNTL ON T/O,ROD SEPARATED.
```

## Aircraft

- Registration: [N121PM](https://openairdocs.org/aircraft/N121PM), registered now, S/N 14, built 1966 (OpenAirDocs)
- Reported make and model: DEHAVILLAND DHC-6
- Registry model: [Dehavilland DHC-6 TWIN OTTER](https://openairdocs.org/model/dehavilland-dhc-6-twin-otter) (registry code 2802606) (OpenAirDocs)
- Registry engine: [U/A Canada PT6 SER 578HP](https://openairdocs.org/engine/u-a-canada-pt6-ser-578hp) (registry code 61501, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Engines: turbo prop
- Damage: Substantial damage
- Airport: Bradley

## Other investigations on N121PM (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 LAX91FA052](https://openairdocs.org/ntsb/LAX91FA052), Dec 9, 1990: de Havilland DHC-6-100 (N121PM), Perris Valley, CA, substantial damage. Probable cause: A LOSS OF POWER ON THE LEFT ENGINE DUE TO A FATIGUE FAILURE OF A COMPRESSOR TURBINE BLADE LEADING TO FURTHER COMPRESSOR BLADE DAMAGE; A WORN POWER TURBINE GOVERNOR THROTTLE CAM ASSEMBLY WHICH LED TO…
- [NTSB NYC71AN117](https://openairdocs.org/ntsb/NYC71AN117), Jun 4, 1971: Dehavilland DHC-6 (N121PM), Flushing, NY, minor damage
- [NTSB NYC67I0103](https://openairdocs.org/ntsb/NYC67I0103), Jan 19, 1967: Dehaviland DHC-6 (N121PM), Farmingdale, NY, incident, no 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.