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) |
Destination airport: | Schaumburg, IL (06C) |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative: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:
|
| |
Investigating agency: | NTSB |
Report number: | CEN10LA560 |
Status: | Investigation completed |
Duration: | 7 months |
Download report: | Final report |
|
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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