Lycoming Mandatory Service Bulletin 388C
PDF, 13 pages from the NTSB's investigation of the Textron Aviation INC 172S accident near Erie, Colorado, November 9, 2023. 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 CEN24LA036, titled "Lycoming Mandatory Service Bulletin 388C" by the NTSB, 13 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.