Cessna 172L Skyhawk
Defective Retread
New retread tire installed on aircraft. Three hours and four landings later, post-flight inspection revealed a bulge on inboard sidewall. Examination revealed an air gap of 0.375 to 0.5 inch depth between outer and inner surfaces. Gap area estimated 2-3 square inches. Groove was sliced open; outer rubber thickness at slice was less than 0.030 inch. Tire was shipped to me with 8130 release, but was not airworthy.
