# NTSB SEA82DA047: Sikorsky S-58J, N47246, Siletz, OR, April 6, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: April 6, 1982, 09:45 local (17:45 UTC)
- Place: Siletz, OR
- Coordinates: 44.770656, -123.920768 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.7707&lon=-123.9208&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report April 6, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 72623
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA82DA047
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/72623/pdf
- Page: https://openairdocs.org/ntsb/SEA82DA047

## Analysis

AFTER LIFT-OFF WITH A 3000 POUND EXTERNAL SLING LOAD, A "POP" WAS HEARD FOLLOWED BY LOW-LEVEL VIBRATION. ROTOR RPM DECAYED AND AN AUTOROTATION WAS EFFECTED TO A FORCED LANDING IN A REVINE. POSTCRASH INSPECTION REVEALED A FAILURE OF THE ENGINE DRIVE "SHORT SHAFT".

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power, takeoff - initial climb
  - accessory drive assy,drive shaft - failure,total (cause)
- Forced landing, landing - flare/touchdown

## 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: SIKORSKY S-58J
- 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
- Serial number: 58-960
- Airframe hours: 7929
- Engines: P&W PT6 T-3 1800 horsepower turbo shaft
- Damage: Destroyed
- Flight: Part 133
- Operator: Pacific Helicopters, Inc.
- Registered owner: Pacific Helicopters, Inc.
- Departed: SILETZ, OR
- Destination: SILETZ, OR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 35; commercial, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; flight hours: 8,521 total, 2,016 in this make and model, 8,521 as pilot in command, 250 in the last 90 days, 111 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 45° at 15 knots
- Visibility: 10 statute miles
- Lowest ceiling: 5,000 ft broken
- Temperature: 113 °F

## 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 19820406008069A](https://openairdocs.org/incident/19820406008069A), Apr 6, 1982: Skrsky S58J, Siletz, OR, Substantial damage. Engine drive short shaft failed on sling load operation. Crash landed. Evidence of prior repairs at failure point.

## Other investigations on N47246 (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ANC75AA009](https://openairdocs.org/ntsb/ANC75AA009), Aug 4, 1974: Sikorski S58ST (N47246), Umiat, AK, substantial damage

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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