ASN Wikibase Occurrence # 367941
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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 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Hudsonville, MI -
United States of America
|
Phase: | En route |
Nature: | Agricultural |
Departure airport: | Byron Center, MI |
Destination airport: | Hudsonville, MI |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative: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:
|
| |
Investigating agency: | NTSB |
Report number: | CHI89DEM09 |
Status: | Investigation completed |
Duration: | 2 years and 9 months |
Download report: | Final report |
|
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 |
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