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ASN Wikibase Occurrence # 177728
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Type:Silhouette image of generic AS55 model; specific model in this crash may look slightly different
Eurocopter AS 355N Ecureuil II
Owner/operator:Landry's Seafood
Registration: N355CV
MSN: 5569
Fatalities:Fatalities: 0 / Occupants: 6
Other fatalities:0
Aircraft damage: Substantial
Location:League City, TX -   United States of America
Phase: Landing
Departure airport:Pearland, TX (LVJ)
Destination airport:Houston, TX (HOU)
Investigating agency: NTSB

The 13,800-hour airline transport pilot and five passengers departed on a short pleasure flight after satisfactorily completing a maintenance check with the engines running on the ground. The pilot flew to a local airport and made a normal straight-in approach, executed an autorotation with a power recovery, then proceeded back to the home airport. While en route, after the helicopter crossed over a large row of power lines, the pilot reported the helicopter lost all engine power. However, none of the anticipated aural warnings, annuciator lights, abnormal vibrations or sounds associated with a power failure was observed. The pilot entered an autorotation and the helicopter contacted the ground hard and rolled over. Examination of the helicopter revealed continuity to all flight controls and the main gearbox. The #1 engine was placed on a test cell, started immediately, and was run at various power settings without interruption. Due to impact damage the #2 engine could not be test-run. Examination of the #1 and #2 engines' main gearbox coupling shafts by an NTSB Materials Specialist revealed that the shafts were both fractured at the reduced section adjacent to the main gear box input splines. The fracture plane, presence of dimpling, and direction of fracture were consistent with ductile torsional overstress with the engines running. In addition, data retrieved from the digital engine control units and damage to the main gear drive shafts indicated that both engines were operating at the time of impact. No mechanical deficiencies were noted that would have attributed to a loss of power on either engine. Several attempts were made to obtain a copy of NTSB Form 6120.1/2, Pilot/Operator Accident Report; however, the pilot failed to submit a completed report.

Probable Cause: "THIS CASE WAS MODIFIED MAY 30, 2006."

The pilot's misjudged flare during an autorotation, which resulted in a hard landing and subsequent rollover.




Revision history:

11-Jul-2015 18:43 Noro Added
23-May-2016 19:17 Aerossurance Updated [Time, Aircraft type]
21-Dec-2016 19:30 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
07-Dec-2017 17:58 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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