# NTSB SEA84LA066: Hiller UH-12E, N62377, Forest Grove, OR, March 12, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 12, 1984, 11:00 local (19:00 UTC)
- Place: Forest Grove, OR
- Coordinates: 45.550086, -123.150619 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.5501&lon=-123.1506&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 39881
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA84LA066
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/39881/pdf
- Page: https://openairdocs.org/ntsb/SEA84LA066

## Sequence of events

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

- Loss of engine power, hover
  - reason for occurrence undetermined (cause)
- Forced landing, landing
  - autorotation - performed, pilot in command
- In flight collision with object, landing - flare/touchdown
  - object - tree(s) (contributing factor)

## Analysis

THE PLT REPORTED THAT WHILE HOVERING, DURING AN EXTERNAL LOAD OPERATION, THE ENG LOST POWER & BLUE SMOKE & FLAMES EXITED THE BACK OF THE HELICOPTER. THE HELICOPTER THEN STRUCK TREES BEFORE COMING TO REST. DURING AN INVESTIGATION, THE ENG STARTED NORMALLY & WAS RUN TO 56% (N1) & 88% (N2). NO CONTAMINENTS WERE FOUND IN THE FUEL SYS.

## Aircraft

- Registration: [N62377](https://openairdocs.org/deregistered/N62377-2013-04-29), registration cancelled 2013-04-29, S/N 1152, built 1958 (OpenAirDocs)
- Reported make and model: HILLER UH-12E
- Registry model: [Hiller H-23D](https://openairdocs.org/model/hiller-h-23d) (registry code 4360120) (OpenAirDocs)
- Registry engine: [Lycoming VO-435 series](https://openairdocs.org/engine/lycoming-vo-435-series) (registry code 41525, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 1152
- Airframe hours: 10602
- Engines: ALLISON 250-C20B 305 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Other work use, Part 133
- Registered owner: Mountain Air Helicopters
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: 100 hour, March 10, 1984, 0 hours before
- Departed: FOREST GROVE, OR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 6,008 total, 3,500 in this make and model, 6,000 as pilot in command, 140 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 16 knots
- Visibility: 10 statute miles
- Lowest ceiling: 3,200 ft broken
- Temperature: 46 °F, dew point 45 °F
- Altimeter: 29.00 inHg
- Observed at: HIO, 25 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 19840312006619A](https://openairdocs.org/incident/19840312006619A), Mar 12, 1984: Hiller UH12E, Forest Grove, OR, Substantial damage. Pilot reported engine lost power while hovering to attach long line. Crashed into trees. Engine check out normal.

## Other investigations on N62377 (3)

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 SEA82DA057](https://openairdocs.org/ntsb/SEA82DA057), Apr 23, 1982: Hiller-Soloy 12E (N62377), Christmas Valle, OR, minor damage
- [NTSB SEA81DYE31](https://openairdocs.org/ntsb/SEA81DYE31), Jun 10, 1981: Hiller UN-12D (N62377), Castle Rock, WA, destroyed
- [NTSB SEA80DYE03](https://openairdocs.org/ntsb/SEA80DYE03), Oct 29, 1979: Hiller Acft UH-12D (N62377), Amanda Park, WA, substantial damage

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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