# NTSB ANC66A0052: Sikorsky S55, N874, Kenai, AK, June 29, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 29, 1966
- Place: Kenai, AK · KENAI, AK
- Location: 60.5618° N, 151.2105° W: Placed by OpenAirDocs: center of Kenai, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=60.5618&lon=-151.2105&mi=10
- Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 2, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 171708
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC66A0052
- Page: https://openairdocs.org/ntsb/ANC66A0052

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0569  66/6/29  NR.KENAI ALAS         SIKORSKY S55        CR-  0  0  1  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 1434                    N874                PX-  0  0  0  AIR TAXI-CARGO            AGE 44, 2156 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            618 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - SHELL PLATFORM A
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           TURBULENCE                                               STATIC: IDLING ROTORS
        PROBABLE CAUSE(S)
           WEATHER - DOWNDRAFT,UPDRAFTS
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      55
        WIND VELOCITY-KNOTS                                      TYPE OF WEATHER CONDITIONS
           15                                                      VFR
        TYPE OF FLIGHT PLAN
          NONE
        REMARKS- STRONG UPDRAFT WINDS ALONG SIDES OF PLATFORM CAUSED MAIN ROTOR TO STRIKE TAIL BOOM.
```

## Aircraft

- Registration: [N874](https://openairdocs.org/deregistered/N874-2013-03-11), registration cancelled 2013-03-11, S/N 551004, built 1956 (OpenAirDocs)
- Reported make and model: SIKORSKY S55
- Registry model: [Sikorsky S-55](https://openairdocs.org/model/sikorsky-s-55) (registry code 8141602) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Shell Platform A

## Other investigations on N874 (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 LAX81FA093](https://openairdocs.org/ntsb/LAX81FA093), May 29, 1981: Sikorsky S-55 (N874), Beaumont, CA, destroyed, 6 fatal

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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