# NTSB ANC75AA009: Sikorski S58ST, N47246, Umiat, AK, August 4, 1974

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: August 4, 1974
- Place: Umiat, AK · UMIAT, AK
- Location: 69.3669° N, 152.1442° W: Placed by OpenAirDocs: center of Umiat, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=69.3669&lon=-152.1442&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed, report September 23, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 134537
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC75AA009
- Page: https://openairdocs.org/ntsb/ANC75AA009

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2360   74/8/4  NR.UMIAT,ALAS         SIKORSKI S58ST      CR-  0  1  0  COMMERCIAL                ATP,FLIGHT INSTR., AGE
        TIME - 1500                    N47246              PX-  0  0  0  CTR CARGO-D               UNK/NR, 13500 TOTAL
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            HOURS, 256 IN TYPE,
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         UMIAT,ALAS                   LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             TAKEOFF: VERTICAL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - LOAD NOT JETTISONED
        REMARKS- RAPID APPLICATION OF COLLECTIVE,EXPERIENCED COLLECTIVE BOUNCE.INSUFFICIENT COLLECTIVE FRICTION.
```

## Aircraft

- Registration: [N47246](https://openairdocs.org/deregistered/N47246-2014-10-14), registration cancelled 2014-10-14, S/N 58-960, built 1958 (OpenAirDocs)
- Reported make and model: SIKORSKI S58ST
- Registry model: [Sikorsky S-58JT](https://openairdocs.org/model/sikorsky-s-58jt) (registry code 8141807) (OpenAirDocs)
- Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: Substantial damage

## 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 19740804027309A](https://openairdocs.org/incident/19740804027309A), Aug 4, 1974: Skrsky S58JT, Umiat, AK, Substantial damage. Rapid application of collective,experienced collective bounce. Insufficient collective friction.

## Other investigations on N47246 (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 SEA82DA047](https://openairdocs.org/ntsb/SEA82DA047), Apr 6, 1982: Sikorsky S-58J (N47246), Siletz, OR, 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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