ASN Wikibase Occurrence # 77881
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| Date: | Monday 20 September 2010 |
| Time: | 17:20 |
| Type: |  Hughes 269C |
| Owner/operator: | Bachman Aero |
| Registration: | N34LB |
| MSN: | 780714 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 1759 hours |
| Engine model: | Lycoming HIO-360 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Schaumburg Airport (06C), Illinois -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Schaumburg, IL (06C) |
| Schaumburg, IL (06C) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While the helicopter was hovering prior to departure for a routine training flight, a bolt and its associated hardware for the left aft cluster fitting of the tail boom assembly departed the helicopter. Subsequently, the instructor initiated a forced landing and the helicopter came to rest upright. Examination of the bolt and lock nut revealed incomplete threads at the pinch point of the locking stake due to a manufacturing defect. The bolt and lock nut assembly were installed as part of an aft cluster fitting modification that was performed about 4 months and 216 operational hours prior to the accident. As a result of the accident, the Federal Aviation Administration issued an Emergency Airworthiness Directive for owners to check the lock nuts.
Probable Cause: The in-flight separation of the left aft cluster fitting assembly following the loss of torque on the lock nut due to a manufacturing defect.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Sep-2010 23:18 | slowkid | Added |
| 21-Sep-2010 11:08 | slowkid | Updated [Aircraft type, Registration, Cn, Operator, Phase, Nature, Destination airport, Source, Damage] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 26-Nov-2017 18:11 | ASN Update Bot | Updated [Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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