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ASN Wikibase Occurrence # 121101
Last updated: 17 August 2020
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Type:Silhouette image of generic S58T model; specific model in this crash may look slightly different
Sikorsky S-58ET
Owner/operator:Aris Helicopters
Registration: N33602
C/n / msn: 58-727
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Location:Los Angeles, CA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:External load operation
Departure airport:Riverside, CA (KRIV)
Destination airport:El Secundo, CA
Investigating agency: NTSB
While making the final external load lift from the roof of an office building, the pilot reported that one of the two engines lost power. Witnesses assisting in the operation also reported hearing an engine wind down. The helicopter drifted forward, veered off the side of the roof, and impacted trees and landscaping below. The pilot reported that he had about 400 lbs of fuel on board before the accident flight. The weight of the air scrubber that was being lifted was estimated to be 4,700 lbs; the maximum lifting capability of the helicopter was 5,000 lbs. The pilot reported that he depressed the electrical cargo release switch a couple of times before the helicopter collided with the building and terrain, but he did not attempt to use the manual release because it would have required him to remove his feet from the antitorque pedals to activate a foot lever next to the pedals. During the wreckage examination, the cargo hook was found in the closed position. Postaccident examination of the hook did not reveal any anomalies that would have precluded normal operation; however, due to the extensive impact and fire damage to the electrical system, it could not be determined why the hook did not release the load. Organic debris located on the intake screen of the #1 engine and the lack of such debris on the intake screen of the #2 engine indicated that the #2 engine probably was not operating at the time of the accident. A postaccident examination of both engines revealed no anomalies that would have precluded normal engine operation. Had the pilot been able to release the load, he might have been able to make a successful landing.
Probable Cause: A partial loss of engine power and the failure of the external hook to release the load for undetermined reasons.



Revision history:

13-Mar-2011 19:15 bizjets101 Added
21-Mar-2011 18:17 TB Updated [Operator, Location, Departure airport, Destination airport, Source]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 16:44 ASN Update Bot Updated [Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Plane category]

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