On July 20, 1998, a Cessna R182 (registration N9142C) was involved in an aviation accident near Bismarck, ND. Investigators recorded the probable cause as: The fatigue failure of the fuel system line fitting. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An FAA inspection found a fractured electric fuel pump to carburetor T-connector. NTSB metallurgical analysis revealed fatigue crack features including clamshell marks and river patterns.
Inspection Discovery
During an inspection of the engine compartment by a Federal Aviation Administration (FAA) inspector, a fractured electric fuel pump to carburetor T-connector (Part Number AN917-20) was found. The fitting had separated, prompting further examination.
Metallurgical Analysis
The National Transportation Safety Board's Material Laboratory conducted a metallurgical analysis of the separated fitting. The analysis revealed clamshell-shaped crack arrest marks and step-like features on the fracture surface. Closer examination of the step-like features showed a large number of markings similar to river patterns, which converged at numerous locations on the outside diameter at the root of the thread of the fitting. No mechanical damage was noted at any of the crack origin locations.
Previous Inspection
The last airplane inspection recorded was a 100-hour inspection performed in March 1998.
What happened in the 20 Jul 1998 Cessna R182 accident near Bismarck, ND?
An FAA inspection found a fractured electric fuel pump to carburetor T-connector. NTSB metallurgical analysis revealed fatigue crack features including clamshell marks and river patterns.
What aircraft was involved and where did it happen?
The accident on 20 Jul 1998 involved a Cessna R182, registration N9142C, at Bismarck, ND.
What was the probable cause of the accident?
The fatigue failure of the fuel system line fitting.
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