- Date
- January 5, 1984, 14:50 local (22:50 UTC)
- Place
- Mapleton, OR
- Injuries
- 1 minor
- Damage
- Substantial damage
- Phase of flight
- Maneuvering
- Aircraft
- N4027KHiller UH-12E
- Weather
- Visual (VMC) · Day
- Status
- Completed
- Report
- Approved by Office Director
- FAA report
- 19840105000059A
- Case key
- 39859
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Analysis
While approaching the spray area, the acft was in a level attitude at 20 to 25 mph & about 100 ft AGL when the plt heard a loud bang & noted a loss of power. He attempted an autorotative landing. During touchdown on hilly terrain, the acft rolled to the right & came to rest inverted on a steep slope. A teardown of the eng revealed that a spur adapter gearshaft, pn 6890482, & a compressor coupling adapter, pn 6871472, had failed. Failure of the spur adapter gearshaft was due to fatigue which originated at an area of heavy wear on the load side of the forward splines.
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.
Aircraft
- Registration
- N4027K
- Reported as
- Hiller UH-12E
- Category
- Helicopter
- Serial number
- 5067
- Airframe hours
- 2,267
- Engine
- Allison 250-C20B, 305 horsepower, turbo shaft
- Damage
- Substantial damage
- Flight
- Aerial application · Part 137
- Registered owner
- Western Helicopters
- Airworthiness certificate
- Special, Restricted (Special)
- Last inspection
- 100 hour · January 3, 1984 · 5 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
- Certificates
- Airline transport, Commercial
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Helicopter, Airplane
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 5,675 total · 250 in this make and model · 5,427 as pilot in command · 102 in the last 90 days · 5 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- Calm
- Visibility
- 5 statute miles
- Lowest ceiling
- None
- Temperature
- 50 °F
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.