# NTSB SEA86FA139: Hiller UH12B, N41319, Rathdrum, ID, June 8, 1986

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Field investigation · Final report
- Date: June 8, 1986, 13:50 local (20:50 UTC)
- Place: Rathdrum, ID
- Coordinates: 47.839118, -116.880142 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.8391&lon=-116.8801&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 40285
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA86FA139
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40285/pdf
- Page: https://openairdocs.org/ntsb/SEA86FA139

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, cruise
  - fuel supply - misjudged, pilot in command (cause)
  - fluid,fuel - exhaustion
- Forced landing, descent - emergency
  - autorotation - not performed, pilot in command (cause)
- In flight collision with terrain/water, landing - flare/touchdown
  - rotor rpm - not maintained, pilot in command (cause)

## Analysis

THE PLT REPORTED NOTICING THE FUEL GAGE WAS NEARING EMPTY SHORTLY BEFORE THE ENG QUIT. THE ACFT CRASHED DURING AN ATTEMPTED FORCED LANDING ON A ROAD. THE PLT STATED HE WAS FLYING THE ACFT TO HIS RESIDENCE WHERE IT WAS BASED. INVESTIGATION REVEALED LITTLE FUEL REMAINED WITHIN THE FUEL SYSTEM AND NO SIGNS OF FUEL LEAKAGE DURING THE ACCIDENT.

## Aircraft

- Registration: [N41319](https://openairdocs.org/aircraft/N41319), registered now, S/N 433 (OpenAirDocs)
- Reported make and model: HILLER UH12B
- Registry model: [Hiller UH-12B](https://openairdocs.org/model/hiller-uh-12b) (registry code 4360110) (OpenAirDocs)
- Registry engine: [Franklin 6VS-335 series](https://openairdocs.org/engine/franklin-6vs-335-series) (registry code 27040, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 433
- Airframe hours: 2855
- Engines: FRANKLIN GV4-200 200 horsepower reciprocating
- Damage: Destroyed
- Flight: Personal, Part 91
- Operator: William A. Dole
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, March 7, 1986, 22 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 51; private; airplane ratings: single-engine land; seat: center; flight hours: 400 total, 50 in this make and model, 300 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 170° at 5 knots
- Visibility: 20 statute miles
- Lowest ceiling: 6,000 ft overcast
- Temperature: 61 °F, dew point 48 °F
- Altimeter: 30.00 inHg
- Observed at: COE, 4 nm away

## 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 19860608022059A](https://openairdocs.org/incident/19860608022059A), Jun 8, 1986: Hiller UH12B, Rathdrum, ID, Destroyed. Aircraft was damaged and occupants injured during a hard emergency landing. Engine failed from fuel exhaustion.

## Other investigations on N41319 (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 FTW94LA125](https://openairdocs.org/ntsb/FTW94LA125), Apr 16, 1994: Hiller UH-12 (N41319), Alvin, TX, substantial damage. Probable cause: THE PILOT'S FAILURE TO MAINTAIN ROTOR SPEED, DELAY OF THE FLARE, AND THE IMPROPER TOUCHDOWN. A FACTOR WAS THE LOSS OF ENGINE POWER FOR UNDETERMINED REASONS.

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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