Lycoming Service Instruction 1191A
PDF, 2 pages from the NTSB's investigation of the Piper PA28 accident near Columbia, Illinois, July 28, 2018. Shown as the NTSB released it (fetched from the NTSB as you open it).
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About this document
It is item 5 in the NTSB's docket for case CEN18LA299, titled "Lycoming Service Instruction 1191A" by the NTSB, 2 pages. The NTSB removes some personal details before releasing docket documents; this site shows them as released and does not alter them. The docket at the NTSB.