ASN Wikibase Occurrence # 68156
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| Date: | Sunday 6 September 2009 |
| Time: | 14:00 |
| Type: |  MBB Bo 105CBS-4 |
| Owner/operator: | Era Helicopters |
| Registration: | N131EH |
| MSN: | S-595 |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 16155 hours |
| Engine model: | Allison 250-C20 SER |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Schriever, LA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Test |
| Departure airport: | Thibodaux, LA (L83) |
| Thibodaux, LA (L83) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While in a 3-foot hover the helicopter began an uncommanded roll to the right. The pilot unsuccessfully attempted to arrest the roll by applying full left cyclic. Moments later the right landing skid made contact with the ground, followed by the main rotor blades. The helicopter came to rest in a right-side-low, upright position and the pilot was able to exit unassisted. The purpose of the flight was to perform an operational flight check of maintenance performed to the cyclic control system. The investigation revealed that the mechanic who had performed the maintenance had inadvertently switched two cyclic control tubes, of different lengths, during reassembly. This resulted in an out-of-rig condition in the cyclic control system. No other preimpact anomalies were noted with the helicopter's flight control system.
Probable Cause: The pilot's inability to maintain control due to the mechanic's inadvertent switching of two cyclic control tubes of different lengths during maintenance.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Sep-2009 10:32 | David_Landry | Added |
| 07-Sep-2009 10:35 | harro | Updated |
| 07-Sep-2009 11:01 | RobertMB | Updated |
| 07-Sep-2009 11:21 | RobertMB | Updated |
| 08-Sep-2009 11:53 | RobertMB | Updated |
| 27-Oct-2012 12:09 | TB | Updated [Aircraft type, Operator, Location, Nature, Damage, Narrative] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 02-Dec-2017 16:16 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
| 10-Dec-2018 18:30 | TB | Updated [Operator, Other fatalities, Nature, Damage] |
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