ASN Wikibase Occurrence # 370212
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| Date: | Monday 21 July 2008 |
| Time: | 12:07 LT |
| Type: |  Md Helicopters MD 902 |
| Owner/operator: | California Shock Trauma Air Rescue |
| Registration: | N902CS |
| MSN: | 900-00123 |
| Total airframe hrs: | 55 hours |
| Engine model: | Pratt and Whitney - Canada PW207E |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Salinas, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Ferry/positioning |
| Departure airport: | San Jose, CA (KRMC) |
| Salinas Municipal Airport, CA (SNS/KSNS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During the approach to land, the pilot reported that he brought the helicopter to an 8- to 10-foot hover when the nose broke to the right and the helicopter started an uncommanded right spin. The pilot's attempt to correct with full left pedal failed to stop the spin. The pilot then initiated a hovering autorotation, which resulted in a hard landing and minor damage to the landing skids. The postaccident airframe inspection revealed that the threaded portion of the rear of the forward directional control cable of the no tail rotor (NOTAR) had separated. The forward directional control cable and the rotating cone control rod of the NOTAR, as well as associated hardware, were sent to an NTSB specialist for a detailed examination. The examination of the cable and associated hardware revealed that the cable had failed in fatigue due to the misplacement of the lock washer that was located between the cable's telescopic part and the rotating cone control rod.
Probable Cause: The pilot's inability to maintain directional control due to the fatigue failure of the threaded portion of the forward directional control cable as a result of the improper installation a lock washer.
Accident investigation:
 |
|
Sources:
NTSB LAX08IA241
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Mar-2024 08:16 | ASN Update Bot | Added |
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