ASN Wikibase Occurrence # 40833
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| Date: | Tuesday 10 November 1998 |
| Time: | 11:00 LT |
| Type: |  Hiller UH-12E |
| Owner/operator: | Donald G. Beck |
| Registration: | N752GB |
| MSN: | 1752 |
| Total airframe hrs: | 8515 hours |
| Engine model: | Lycoming VO-540-C2A |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Marshall, WA -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | |
| Keller, WA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While climbing out after takeoff from the helicopter pad located at the pilot's residence/place of business, the bolt that connected the lower end of the upper-firewall lateral cyclic linkage bellcrank to its push rod separated from the aircraft. With the bolt missing from the control linkage, the necessary increase of the angle of attack (cyclic feathering) of the retreating blade (port blade) could not take place. Without this feathering, which is produced by the lateral position of the cyclic, the forward-moving blade (starboard side)produced considerably more lift than the retreating blade. This resulted in an uncontrolled roll to the left and an uncontrolled descent into the terrain.
Probable Cause: The loss of the bolt that connects the lateral cyclic linkage push rod to the lower end of the upper firewall-mounted lateral cyclic linkage bellcrank, resulting in an uncontrolled descent into the terrain.
Accident investigation:
 |
|
Sources:
NTSB SEA99FA013
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 04-Apr-2024 14:29 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Source, Narrative, Category, Accident report] |
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