# NTSB ANC70A0020: Sikorsky S-64E, N6964R, Prudhoe Bay, AK, September 2, 1969

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: September 2, 1969
- Place: Prudhoe Bay, AK · PRUDHOE BAY, AK
- Location: 70.2553° N, 148.3372° W: Placed by OpenAirDocs: center of Prudhoe Bay, AK, within about 11 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=70.2553&lon=-148.3372&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 3 fatal
- Status: Completed, report April 21, 1970
- Report: Brief approved by the director
- NTSB case key (mKey): 154396
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC70A0020
- Page: https://openairdocs.org/ntsb/ANC70A0020

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3686   69/9/2  NR.PRUDHOE BAY,ALAS   SIKORSKY S-64E      CR-  2  0  0  COMMERCIAL                COMMERCIAL, AGE 37, 4787
        TIME - 1735                    N6964R              PX-  1  0  0  CTR CARGO-D               TOTAL HOURS, 830 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          PRUDHOE BAY,ALAS            32 MI.NW PRUDHOE BAY
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      IN FLIGHT: NORMAL CRUISE
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           ROTORCRAFT - FLIGHT CONTROL SYSTEMS: TAIL ROTOR PITCH CONTROL SYSTEM
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: INCORRECT FACTORY INSTALLATION
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
         FIRE AFTER IMPACT
        REMARKS- GUARD,PN 65113-07108-108,MISSING.T/R PITCH CTL LINK ASSY FAILED.GENL IN FLIGHT BREAKUP OF ACFT.
```

## Aircraft

- Registration: [N6964R](https://openairdocs.org/deregistered/N6964R-1969-11-24), registration cancelled 1969-11-24, S/N 64059, built 1968 (OpenAirDocs)
- Reported make and model: SIKORSKY S-64E
- Registry model: [Sikorsky S-64E](https://openairdocs.org/model/sikorsky-s-64e) (registry code 8142604) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: Destroyed

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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