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| Date: | Thursday 28 September 1989 |
| Time: | 08:45 LT |
| Type: |  Hiller UH-12E |
| Owner/operator: | Byron Ag Aviation, Inc. |
| Registration: | N4028T |
| MSN: | 5097 |
| Total airframe hrs: | 1197 hours |
| Engine model: | Lycoming VO-540-C2A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hudsonville, MI -
 United States of America
|
| Phase: | En route |
| Nature: | Agricultural |
| Departure airport: | Byron Center, MI |
| Hudsonville, MI | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
APPROXIMATELY 10 MINUTES AFTER TAKEOFF AT AN ALTITUDE OF 300 FT AGL AND AN AIRSPEED OF 60 KTS, THE PILOT EXPERIENCED A SEVERE VIBRATION AND A DECREASE IN RESPONSE TO CONTROL INPUTS. THE PILOT ENTERED AN AUTOROTATION AND WHEN APPROXIMATELY 10 - 15 FT AGL, THE TAIL BOOM WAS SEPARATED BY THE MAIN ROTOR. THE HELICOPTER THEN DESCENDED, NOSE FIRST, TO TERRAIN IMPACT. INSPECTION REVEALED A TENSION-TORSION PIN HAD FAILED AT THE DRAG BRACE BOLT HOLE. PRE-EXISTING CRACKS WERE FOUND EXTENDING FROM THE PIN SHANK TO THE BOLT HOLE.
Probable Cause: THE FATIGUE FAILURE OF ONE OF THE TENSION-TORSION PINS.
Accident investigation:
 |
|
Sources:
NTSB CHI89DEM09
History of this aircraft
Other occurrences involving this aircraft
| 2 June 1998 | N4028T | Frank And Judy Wilson | 0 | Delaplaine, AR | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Mar-2024 20:31 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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