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ASN Wikibase Occurrence # 20396
Last updated: 26 April 2019
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Date:30-MAY-2008
Time:11:00
Type:Silhouette image of generic AC90 model; specific model in this crash may look slightly different
Rockwell Aero Commander 690A
Owner/operator:Thomas D Klemans
Registration: N115AB
C/n / msn: 11231
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Category:Accident
Location:Tacoma Narrows Airport, Tacoma, WA -   United States of America
Phase: Landing
Nature:Private
Departure airport:Tacoma, WA (TIW)
Destination airport:Tacoma, WA (TIW)
Investigating agency: NTSB
Narrative:
After landing and during the roll out the right main landing gear collapsed. An examination of the landing gear revealed that the right main landing gear inboard clevis, which serves as the connection between the inboard hydraulic actuating cylinder to the main landing gear body, had failed. A metallurgical examination of the clevis fracture region revealed that it had failed in overstress. No preexisting cracks or corrosion were noted at the fracture and the laboratory could not determine an underlying reason for the overstress fracture. The main landing gear is retained in the down and locked position by hydraulic pressure being applied to the inboard main landing gear actuating cylinder, as well as being assisted by the outboard main landing gear (hydraulic-pneumatic) actuating cylinder. Additionally, bungee cords attached to the main landing gear drag braces assures that the main landing gear is locked and retained in the down position. As a result of these redundant features that are designed to ensure that the main landing gear is locked in the down position, the gear collapse cannot be positively attributed to the failure of the clevis. During a post accident examination of the right main landing gear a replacement clevis was installed and multiple landing gear extension and retraction cycles were performed. The landing gear system, including the proper sequencing of all components, operated correctly and no anomalies were noted. The reason for the landing gear collapse was undetermined.
Probable Cause: The collapse of the right main landing gear for undetermined reasons.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20080606X00804&key=1


Revision history:

Date/timeContributorUpdates
01-Jun-2008 11:35 Fusko Added
02-Jun-2008 11:25 harro Updated
21-Dec-2016 19:14 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:16 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:20 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
03-Dec-2017 10:50 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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