Sunday, August 20, 2017

Bellanca 17-31ATC Super Viking, N28119: Accident occurred March 20, 2014 at Salt Lake City International Airport (KSLC), Utah

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Salt Lake City, Utah

Aviation Accident Final Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

Investigation Docket - National Transportation Safety Board: https://dms.ntsb.gov/pubdms

Aviation Accident Data Summary - National Transportation Safety Board: https://app.ntsb.gov/pdf

http://registry.faa.gov/N28119

NTSB Identification: WPR14LA142
14 CFR Part 91: General Aviation
Accident occurred Thursday, March 20, 2014 in Salt Lake City, UT
Probable Cause Approval Date: 05/13/2015
Aircraft: BELLANCA 17 31, registration: N28119
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The pilot reported that, during the approach, he conducted his usual prelanding checklist, which included verifying the landing gear position and indicator lights four separate times. He conducted an uneventful touchdown; however, during the landing roll, the right main landing gear collapsed. Postaccident examination of the landing gear revealed that the right main landing gear extension spring appeared to be compressed, and, when tested, it only produced 19 to 20 pounds of pressure. It is likely that this reduced pressure was not sufficient to maintain the extension of the right main landing gear. The nose and left main landing gear extension springs were also tested, and they produced about 40 pounds of pressure. The pilot reported that three new springs, all of which produced 44 pounds of pressure, were subsequently installed on the airplane, and no further landing gear system anomalies were reported after flight testing. 

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The failure of the right main landing gear extension spring to maintain adequate pressure, which allowed the landing gear to collapse during the landing roll. 

On March 20, 2014 about 2045 mountain daylight time, a Bellanca 17-31ATC, N28119, sustained substantial damage after the landing gear collapsed at the Salt Lake City International Airport (SLC), Salt Lake City, Utah. The pilot, the sole occupant, was not injured; the airplane sustained substantial damage to the right wing aileron. The airplane was registered to, and operated by, the pilot under the provision of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, and no flight plan was filed. The flight originated from the Roosevelt Municipal Airport (74V), Roosevelt, Utah at about 1950. 

The pilot reported that during the approach he conducted his usual pre-landing checklist, which included verifying the landing gear position and indicator lights four separate times. He conducted a normal, uneventful landing. During the landing roll the landing gear warning indication light activated and the right main landing gear green indicator light extinguished. The right wing dropped to the runway and the airplane slid before coming to a rest just off of the runway surface. 

Postaccident examination of the landing gear by a mechanic and the pilot revealed that the right main landing gear extension spring appeared to be compressed; when tested, it produced 19-20 pounds of pressure. The extension springs from the nose and left landing gear assemblies were also removed and tested; they both produced about 40 pounds of pressure. 

The pilot reported that he subsequently purchased and tested three new springs, all of which produced about 44 pounds of pressure. The new springs were installed on the airplane and no further landing gear anomalies were noted. 

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