ASN Wikibase Occurrence # 132075
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| Date: | Wednesday 20 February 1991 |
| Time: | 11:00 LT |
| Type: |  Hughes 269C |
| Owner/operator: | Helicopter Flight, Inc. |
| Registration: | N8955F |
| MSN: | 1120172 |
| Engine model: | Lycoming HIO-360-D1A |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | North Mankato, MN -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Executive |
| Departure airport: | Mankato, MN (KMKT) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT REPORTED THAT DURING THE AERIAL OBSERVATION FLIGHT HE HEARD A LOUD NOISE FROM THE BACK OF THE HELICOPTER. THE HELICOPTER THEN BEGAN ROTATING CLOCKWISE AND DESCENDED TO IMPACT WITH THE TERRAIN IN A WOODED AREA. POST ACCIDENT IMSPECTION REVEALED A FATIGUE FAILURE OF THE TAIL BOOM SUPPORT STRUT CLUSTER FITTING (LEFT SIDE). AN AIRWORTHINESS DIRECTIVE ISSUED IN 1976 CALLED FOR A DAILY VISUAL INSPECTION AND A 200 HOUR DYE PENETRANT INSPECTION OF THE FITTING. A LOGBOOK ENTRY DATE AUGUST 15, 1990, STATED ALL AD'S HAD BEEN COMPLIED WITH.
Probable Cause: THE FATIQUE FAILURE OF THE TAIL BOOM SUPPORT STRUT ATTACHMENT CLUSTER AND THE IMPROPER INSPECTION OF THE CLUSTER ATTACHMENT.
Accident investigation:
 |
|
Sources:
NTSB CHI91LA097
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Apr-2024 08:12 | ASN Update Bot | Updated [Time, Other fatalities, Phase, Departure airport, Source, Narrative, Category, Accident report] |
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