- Date
- August 4, 1988, 09:30 local (16:30 UTC)
- Place
- North Bend, OR
- Injuries
- 1 minor
- Damage
- Substantial damage
- Phase of flight
- Maneuvering
- Aircraft
- N151LCBell UH-1E
- Weather
- Visual (VMC) · Day
- Status
- Completed · report September 19, 1989
- Report
- Approved by Office Director
- FAA report
- 19880804039629A
- Case key
- 40857
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
Drg a logging opn, the plt noted an apparent transmission malfunction. An autorotative landing was made on unprepared terrain & the helicopter was damaged. An investigation revealed the tail rotor drive input gear in the 42 deg gearbox had failed from fatigue. N151LC was a military surplus helicopter. The gearbox had been overhauled on 6/15/87. The operator's records showed it had been in service for 373 hrs since overhaul.
Aircraft
- Registration
- N151LC
- Reported as
- Bell UH-1E
- Category
- Helicopter
- Serial number
- 151875
- Airframe hours
- 8,288
- Engine
- Lycoming T53-L-13B, 1,400 horsepower, turbo shaft
- Damage
- Substantial damage
- Flight
- Other work use · Part 133
- Registered owner
- Green Mountain Helicopters
- Airworthiness certificate
- Special, Restricted (Special)
- Last inspection
- AAIP · August 2, 1988 · 1 hours before
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 38
- Certificate
- Airline transport
- Instrument ratings
- Helicopter
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 7,805 total · 1,220 in this make and model · 7,612 as pilot in command · 86 in the last 90 days · 68 in the last 30 days · 1 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 340° at 5 knots
- Visibility
- 20 statute miles
- Lowest ceiling
- None
- Temperature
- 70 °F
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.