Hiller UH-12ET accident near Hoquiam, Washington, December 18, 1984
On December 18, 1984 at about 7:00 pm local time, a Hiller UH-12ET (helicopter), registered N100LM, was substantially damaged in an accident near Hoquiam, Washington. It was a positioning flight under general aviation rules (Part 91). 1 person had minor injuries. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
The NTSB has not yet published a probable cause for this accident. Investigations usually take one to two years; this page updates when the final report is released.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- December 18, 1984 · about 7:00 pm local time
- Place
- Hoquiam, Washington · map
- Type
- Accident
- Injuries
- 1 person had minor injuries.
- Weather
- visual conditions (good weather)
- Aircraft
- Hiller UH-12ET · all UH-12ETs on the register
- Registration
- N100LM · registry record · serial 1583
- Damage
- Substantial damage
- Flight
- Positioning flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
PLT REPORTED THAT WHILE IN NORMAL CRUISE FLIGHT, A TOTAL LOSS OF POWER OCCURRED. AUTOROTATION WAS EFFECTED IN MOUNTAINOUS, WOODED TERRAIN. EXAMINATION OF THE ENGINE SHOWED CONTINUITY AND FREEDOM OF ROTATION. EXAMINATION OF THE FUEL SYSTEM DISCLOSED NO DISCREPANCIS.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
Pilot
- Certificate: commercial pilot
- Ratings: single-engine land; instrument: airplane; rotorcraft: helicopter
- Flight time: 5,000 hours in all; 3,500 in this make and model; 100 in the last 90 days
- Medical certificate: Class 2 (valid medical--no waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 2,701 hours
- Last inspection: inspection type not recorded
- Maximum gross weight: 3,100 lb
- Seats: 4
- Landing gear: fixed
- Engine: Allison 250C-20 (turboshaft); 0 hours total
The flight
- Departed from: Elma at 6:35 pm
- Destination: Crane Creek WA
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 090° at 5 knots
- Visibility: 40 statute miles
- Sky: clear
- Temperature: 34°F (1°C), dew point 18°F (-8°C)
- Altimeter: 30.00 inHg
- Observation at 10:45 am from HQM
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Other NTSB records under N100LM the same tail number, which may have belonged to a different aircraft at the time
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.