Check flexible baffle seals for condition and proper orientation.ġ.2.12 Check engine mount for corrosion, heat signatures, and damage to powder coating/paint.ġ.2.13 Check firewall for signs of hard landing at engine mount and if applicable, nose gear attach points. Check inter-cylinder baffles for proper position. Check engine control mounting and security.ġ.2.10 Check cowl flap attachment and operation.ġ.2.11 Check engine baffles for cracks. Check engine transducers (CHT, EGT, etc.) for lead chafing at strain-relief springs.ġ.2.9 Check carburetor and carburetor heat for security, box for damage, and proper travel of heat door. If any cracks or leaks are found, please provide high-resolution photographs.ġ.2.8 Check all fuel and oil lines, wire bundles and ignition harness leads for chafing and security. Check front crankshaft seal for oil leaks. If significant metal is found, please provide one or more high-resolution photographs of filter media, check with a magnet to determine whether metal is ferrous or non-ferrous, and save filter media in a zip-lock plastic bag in the event we need to send it out to a lab for microscopic examination.ġ.2.7 Check crankcase for cracks and oil leaks. What brand and type of plugs installed?ġ.2.6 Remove oil filter, cut open and inspect for metal. Report any abnormal color or appearance, particularly top spark plugs. For each cylinder, report appearance of exhaust valve (particularly asymmetric appearance indicating hot spots), appearance of barrel (loss of crosshatch, vertical scoring, aluminum smearing at 3 or 9 o’clock position suggesting piston pin plug scuffing, excessive oil in combustion chamber).ġ.2.5 Spark plug examination. Report compression readings, master orifice reading, and location of audible air leakage (rings, exhaust valve).ġ.2.3 Check pushrod housing seals, cylinder bases, and rocker covers for oil leaks.ġ.2.4 Borescope examination of all cylinders. NOTE: Estimated labor hours to complete both phases of this checklist is 8-10 hours for normally aspirated airplanes.ġ.1.1 Perform “Airplane Operational and Functional Check” of all systems in accordance with Cessna Airplane Maintenance Manual/Aircraft preflight checklist.ġ.2.1 Check cylinder compressions hot. If there are any high-cost issues noted during Phase 1, we may need to terminate the prebuy examination early. Please perform “Phase 1” items first and report results before proceeding with “Phase 2” items. Cessna 172/182 and 170/180 Series Prebuy Examination – Scope and Detail
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