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Worn piston ring / valve seat
Compression drop isolated to one cylinder points to the ring pack or a leaking valve.
Compression + wet test
Perform a wet compression check to distinguish rings from valve leakage before teardown.
Service bulletin
Cite the applicable SB and AD for the C172S before scheduling parts.
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“How do I set the incidence on a Vayu wing before skinning?”
“Best fireproofing for a C90 fuel tank before first flight?”
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C182_Illustrated_Catalog.pdf
Indexed · 4,210 pages
“Part number for the right prop governor on the O-320?”
→ p.142, Fig 310-B · 614-003-112
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