ASN Wikibase Occurrence # 65138
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| Date: | Friday 22 May 2009 |
| Time: | 13:30 |
| Type: |  Canadian Home Rotors Safari |
| Owner/operator: | Private |
| Registration: | N147MD |
| MSN: | 2129 |
| Engine model: | Superior XP-O-360-A3A2 |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Rock Springs, Arizona -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | Rock Springs, AZ |
| Rock Springs, AZ | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During a personal flight the experimental helicopter experienced an in-flight separation of the main rotor head. Both main rotor blades were located in opposite directions from the main wreckage. The helicopter was substantially damaged by the impact forces and the postimpact fire. Postaccident examination of the main rotor head assembly and the main rotor spindle revealed that the main rotor spindle had failed due to cyclic fatigue. The origin area was located near distinct circumferential machining marks. The manufacturer subsequently issued a mandatory inspection bulletin requiring inspection of all main rotor spindles.
Probable Cause: The separation of the main rotor head during cruise flight as a result of cyclic fatigue of the main rotor head spindle. The fatigue crack was due to an inadequate manufacturing process.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-May-2009 09:44 | slowkid | Added |
| 26-May-2009 10:14 | slowkid | Updated |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Feb-2017 21:00 | PiperOnslaught | Updated [Location, Source, Narrative] |
| 02-Dec-2017 14:55 | ASN Update Bot | Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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