Aerospatiale AS350B accident near Puntilla Lake, Alaska, June 15, 1989
On June 15, 1989 at about 5:40 pm local time, a Aerospatiale AS350B (helicopter), registered N160EH, was destroyed in an accident near Puntilla Lake, Alaska. It was a flight of an unrecorded kind under charter and air-taxi rules (Part 135). 1 person was killed. The weather was conditions the NTSB did not record.
The NTSB's probable cause their words, unchanged
THE PILOT CONTINUED VFR FLIGHT INTO INSTRUMENT METEOROLOGICAL CONDITIONS (IMC) AND FAILED TO MAINTAIN SUFFICIENT ALTITUDE TO CLEAR THE MOUNTAINOUS TERRAIN. THE WEATHER AND TERRAIN CONDITIONS WERE CONTRIBUTING FACTORS.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 15, 1989 · about 5:40 pm local time
- Place
- Puntilla Lake, Alaska
- Type
- Accident
- Injuries
- 1 person was killed.
- Weather
- conditions the NTSB did not record
- Aircraft
- Aerospatiale AS350B · all AS350Bs on the register
- Registration
- N160EH · registry record · serial 2071
- Damage
- Destroyed
- Flight
- Flight of an unrecorded kind · charter and air-taxi rules (Part 135)
The NTSB's narrative final · quoted from the NTSB record
THE AIR TAXI PLT WAS RETURNING THE HELICOPTER TO ITS BASE CAMP AFTER TRANSPORTING PASSENGERS & PARTS TO A REMOTE DRILLING SITE IN RURAL ALASKA. WHILE EN ROUTE, THE HELICOPTER COLLIDED WITH THE ROCK FACE OF A 3900 FT RIDGE AT THE 3500 FT LEVEL. THE WX IN THE AREA WAS RPRTD TO BE OVERCAST BTN 3000 & 3500 FT MSL WITH LIGHT TO OCCASIONALLY HEAVY RAIN. THE PLT HAD AN INSTRUMENT RATING FOR AIRPLANES, BUT NOT FOR HELICOPTERS. HE WAS RPRTDLY IN THE HABIT OF FLYING OVER THE RIDGES, WHEN WX PERMITTED, TO MINIMIZE FLT TIME, INSTEAD OF FOLLOWING LOWER TERRAIN IN NEARBY VALLEYS.
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: multi-engine land; single-engine land; instrument: airplane; rotorcraft: helicopter
- Flight time: 12,400 hours in all; 2,500 in this make and model
- Medical certificate: Class 2 (valid medical--no waivers/lim.)
- Seat: rgt
The aircraft
- Airframe total time: 680 hours
- Last inspection: annual inspection, April 13, 1989; 82 hours since
- Maximum gross weight: 4,300 lb
- Seats: 6
- Landing gear: fixed
- Engine: Turbomeca ARRIEL 1B (turboshaft); 0 hours total
- Fire on the ground
The flight
- Departed from: NONE Puntilla Lake AK at 12:30 pm
- Runway 0
Weather at the time
- Light: daylight
- Sky: overcast; not recorded
- Temperature: 39°F (4°C), dew point 0°F (-18°C)
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.
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.