Hawkins & Powers UH-1B N91NW
12 November 1993 · North Bend, Washington, United States · Minor injuries
Summary
On 12 November 1993 at about 19:30 local time, a Hawkins & Powers UH-1B registered N91NW, operated by Northwest Helicopters, Inc., was involved in an accident near North Bend, Washington, United States. One person was on board and one had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 19:30
- Classification
- Accident
- Location
- North Bend, Washington, United States
- Coordinates
- 47.3894, -121.6091
- Aircraft
- Hawkins & Powers UH-1B
- Registration
- N91NW
- Category
- Helicopter
- Engines
- 1
- Operator
- Northwest Helicopters, Inc.
- Operating rule
- Part 133: Rotorcraft Ext. Load
- Purpose of flight
- Other Work Use
- Phase of flight
- Not recorded
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- SEA94LA030
People
1 person had minor injuries.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 1 | 0 |
Probable cause
TOTAL FAILURE OF THE INTERMEDIATE GEARBOX. THE LACK OF SUITABLE TERRAIN FOR AN AUTOROTATION WAS A FACTOR.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
THE PILOT HEARD LOUD GRINDING SOUNDS FROM THE REAR OF THE AIRCRAFT, FOLLOWED BY BANGING SOUNDS AND A LOSS OF DIRECTIONAL CONTROL. HE JETTISONED HIS LOGS, THEN HIS LONG LINE, AND EXECUTED A POWERED AUTOROTATION INTO THE TREES, SUBSTANTIALLY DAMAGING THE AIRCRAFT. THE 42 DEGREE INTERMEDIATE GEARBOX WAS EXAMINED AND MULTIPLE ORIGIN FATIGUE CRACKS WERE FOUND IN FRAGMENTS OF THE INPUT PINION GEAR.
Quoted verbatim from the NTSB record.
Other Hawkins & Powers UH-1B accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 1 Apr 2000 | Hawkins & Powers UH-1B | Helper, Utah, United States | - | Minor injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 30 Jan 1993 | Cessna A185F | Inglewood, Washington, United States | Johnson, Everett H. | No injuries | - |
| 16 Feb 1993 | Cessna 120 | Battleground, Washington, United States | Wills, Charles R. | Serious injuries | - |
| 25 Feb 1993 | Beechcraft C-99 | Seattle, Washington, United States | Ameriflight, Inc. | No injuries | - |
| 25 Apr 1993 | Cessna 172C | Darrington, Washington, United States | Roulier, Brent L. | Fatal | 1 |
| 15 Jul 1993 | Piper PA-34-220T | Battleground, Washington, United States | Flightcraft Inc. | Fatal | 1 |
| 18 Aug 1993 | Enstrom F-28C | Seattle, Washington, United States | - | No injuries | - |