# NTSB ANC67A0021: Sikorsky S-55, N747A, Galena, AK, August 20, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 20, 1966
- Place: Galena, AK · GALENA, AK
- Location: 64.7409° N, 156.8769° W: Placed by OpenAirDocs: center of Galena, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=64.7409&lon=-156.8769&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report April 11, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 122465
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC67A0021
- Page: https://openairdocs.org/ntsb/ANC67A0021

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0727  66/8/20  NR.GALENA ALAS        SIKORSKY S-55       CR-  0  0  2  COMMERCIAL                COMMERCIAL, AGE 31, 3990
        TIME - 0945                    N747A               PX-  0  0  0  CTR CARGO-D               TOTAL HOURS, 2749 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           COLLIDED WITH: TREES                                     LANDING: FINAL APPROACH
        PROBABLE CAUSE(S)
           MISCELLANEOUS ACTS,CONDITIONS - WATER IN FUEL
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPERLY SERVICED AIRCRAFT (OWNER-PILOT)
           PERSONNEL - OPERATIONAL SUPERVISORY PERSONNEL: DEFICIENCY,COMPANY MAINTAINED EQPMT,SERVICES,REGULATION
           PILOT IN COMMAND - EXERCISED POOR JUDGMENT
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- REFUELED WITH CASE GASOLINE USING WORN FELT STRAINER THAT HAD SEVERAL HOLES IN IT.LANDED IN SWAMP
```

## Aircraft

- Registration: [N747A](https://openairdocs.org/deregistered/N747A-2004-01-16), registration cancelled 2004-01-16, S/N 55910, built 1956 (OpenAirDocs)
- Reported make and model: SIKORSKY S-55
- Registry model: [Sikorsky S-55](https://openairdocs.org/model/sikorsky-s-55) (registry code 8141602) (OpenAirDocs)
- Registry engine: [AiResearch TPE331 series](https://openairdocs.org/engine/airesearch-tpe331-series) (registry code 01517, turbo-prop) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N747A (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 LAX02TA267](https://openairdocs.org/ntsb/LAX02TA267), Aug 30, 2002: Sikorsky S-55T (N747A), Lytle Creek, CA, substantial damage. Probable cause: Failure of the hydraulic system due to contamination in the hydraulic fluid, which resulted in an in-flight loss of control.

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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