- Date
- July 5, 1983, 08:00 local (13:00 UTC)
- Place
- Brooten, MN
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Initial climb
- Aircraft
- N4028KHiller UH-12E
- Weather
- Visual (VMC) · Day
- Status
- Completed
- Report
- Approved by Office Director
- FAA report
- 19830705028519A
- Case key
- 12248
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
The helicopter had just lifted off of the flatbed of a truck when it started to spin. The plt lowered the collective, reduced the power & landed beside the truck. During touchdown, the main rotor blades struck the truck. An investigation revealed that the thrust bearing, pn 25200-3, in the tail rotor drive was installed backwards. This allowed the beveled drive gear to move forward & become disengaged from the tail rotor drive gear.
Aircraft
- Registration
- N4028K
- Reported as
- Hiller UH-12E
- Category
- Helicopter
- Serial number
- 5069
- Airframe hours
- 545
- Engine
- Allison 250-C20B, 305 horsepower, turbo shaft
- Damage
- Substantial damage
- Flight
- Aerial application · Part 137
- Registered owner
- Bonanza Valley Aviation
- Airworthiness certificate
- Special, Restricted (Special)
- Last inspection
- Annual · April 15, 1983 · 117 hours before
- Departed
- Brooten, MN
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
- 44
- Certificate
- Commercial
- Airplane ratings
- Single-engine land
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Center
- Flight hours
- 3,260 total · 360 in this make and model · 3,200 as pilot in command · 120 in the last 90 days · 4 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 360° at 4 knots
- Visibility
- 25 statute miles
- Lowest ceiling
- None
- Temperature
- 61 °F
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N4028K · 1
Matched to the same aircraft by N-number and date.