ASN Wikibase Occurrence # 72253
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| Date: | Tuesday 2 February 2010 |
| Time: | 13:20 |
| Type: |  Hiller UH-12E |
| Owner/operator: | S and S Helicopters |
| Registration: | N36MV |
| MSN: | 5060 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 7064 hours |
| Engine model: | Lycoming VO-540 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 3.5 miles from Los Banos, California -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Los Banos, CA |
| Los Banos, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot of the helicopter had just completed an aerial application flight and was returning to land. As he approached the landing area, he began to apply power, but the engine did not respond. He continued to twist the throttle, but it felt loose with no resistance and the engine speed did not change. He aborted the landing approach and performed a run-on landing in a field; during the approach the engine speed began to decrease and the helicopter landed hard, causing substantial damage to the tail boom and lower fuselage. Postaccident examination revealed that the throttle control attach fitting located in the aft section of the collective control had become separated. The nuts and bolts attaching the fitting were not located. The lack of witness marks on the throttle fitting indicates that either the attachment bolt failed or rapidly unscrewed from its associated nut. The disconnection resulted in a loss of engine control and subsequent partial loss of engine power. The last annual inspection occurred 11 months and 250 flight hours prior to the accident.
Probable Cause: A partial loss of engine power due to a failure of the throttle interconnect hardware, which resulted in a hard landing.
Accident investigation:
 |
|
Sources:
NTSB
History of this aircraft
Other occurrences involving this aircraft
| 9 December 2013 | N36MV | Jeff Streeter Motor Sports Inc | 0 | Chowchilla, California | |
sub |
| Maintenance issues | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Feb-2010 20:53 | slowkid | Added |
| 03-Feb-2010 07:29 | RobertMB | Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Narrative] |
| 28-May-2014 17:06 | Dr. John Smith | Updated [Time, Phase, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 26-Nov-2017 15:22 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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