# NTSB LAX82FA247: Hughes 369B, N1108T, Jenner, CA, July 2, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Field investigation · Final report
- Date: July 2, 1982, 13:30 local (20:30 UTC)
- Place: Jenner, CA
- Coordinates: 38.510902, -123.210372 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=38.5109&lon=-123.2104&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report July 2, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 71193
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX82FA247
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/71193/pdf
- Page: https://openairdocs.org/ntsb/LAX82FA247

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, cruise - normal
  - turboshaft engine,gas generator turbine - overspeed (cause)
  - turboshaft engine,gas generator turbine - overtemperature (cause)
  - turboshaft engine,gas generator turbine - failure,partial (cause)
- Forced landing, landing - flare/touchdown
  - autorotation - performed, pilot in command
- In flight collision with terrain/water, landing - flare/touchdown
  - terrain condition - none suitable (contributing factor)
  - terrain condition - rough/uneven (contributing factor)

## Analysis

HELICOPTER WAS ON ROUTINE POLICE PATROL WHEN ENGINE FAILED AND IT AUTOROTATED TO A ROUGH LANDING ON A ROCKY BEACH. THE 1ST STAGE OF THE GAS PRODUCER SECTION OF THE TURBINE WAS FOUND FROZEN. THE TURBINE WHEEL BLADES WERE RUBBING & SEIZED TO THE 1ST STAGE TURBINE SHROUD OF THE 2ND STAGE NOZZLE ASS'Y. PIECES OF THE TURBINE BLADE'S TRAILING EDGE TIPS WERE MISSING & THERE WAS A METAL BUILDUP ON THE 2ND STAGE NOZZLE BLADE TRACK AREA. DURING DISASSEMBLY THE 1ST STAGE WHEEL HAD TO BE FORCED APART TO BREAK IT LOOSE OF THE 2ND STAGE NOZZLE. FRACTURES OF THE BLADE TIPS APPEARED TO BE CAUSED BY ELEVATED TEMPERATURE CREEP RESULTING FROM EITHER TRANSIENT OVERTEMPERATURE OR OVERSPEED CONDITIONS.

## Aircraft

- Registration: N1108T (not matched to a registry record)
- Reported make and model: HUGHES 369B
- Category: Helicopter
- Serial number: 611000D
- Airframe hours: 463
- Engines: ALLISON 250-C20B 420 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Part 91
- Operator: Sondma County Sheriff
- Registered owner: Sondma County Sheriff
- Departed: C, SANTA ROSA, CA
- Destination: C, SANTA ROSA, CA

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: helicopter, airplane; medical: class 1, valid medical--no waivers/lim.; flight hours: 7,086 total, 500 in this make and model, 6,545 as pilot in command, 117 in the last 90 days, 19 in the last 30 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 325° at 15 knots
- Visibility: 25 statute miles
- Temperature: 154 °F
- Altimeter: 30.00 inHg

## 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 19820702069789A](https://openairdocs.org/incident/19820702069789A), Jul 2, 1982: Hughes 369D, Jenner, CA, Substantial damage. Engine failure during shoreline patrol. Landed on rocky beach. Turbine blade failure from over temp or over speed.

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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