![]() 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. The 172 is a simple, easy to maintain, easy to fly airplane, but should be taken as seriously as a Learjet or a B737.Cessna 172/182 and 170/180 Series Prebuy Examination – Scope and Detail Check the fuel drains once, then check them again, and make sure they shut off. Make sure your aileron movement corresponds to the control yoke movement I found one rigged backward, once. Look for play in the nosewheel scissor linkage. Check the cotter pin securing the castle nut on the axle I knew one pilot that saw his wheel fall away just after takeoff in a 182. If they're missing (and occasionally they are fractured off, generally) you're looking at a wheel assembly failure. Look at the nuts in the wheel assembly the bolt may remain, but lookfor the nuts. Fuel under the cowl or fuel stains along the belly.if you have a stuck gascolator drain or one that's been drained to excess, that's one thing.but you don't want to make assumptions.a stuck carburetor float could cause you some serious problems.or a fuel leak elsewhere.find out what's causing it, if its new or old.same for oil. Where it appears to be leaking may not be the actual site.hydrulic fluid may appear near the tailcone, but it can only come from the ace it back to find out if you have a spillage from a careless mechanic, or an actualy brake leakage. If you find leaks, trace them back the way they came.fuel leaks up and forward, and oil, follow it back agaisnt the airflow. The flap cracks mentioned earlier occur in the trailing edge of the flap, and are the result of flaps being deployed above their speed limitations (Vfe). The checklist is only there to help you get certain items.no law says you can't check more. ![]() Run your hands over the skin, feel the rivets, move the controls, check everything you can see.even if it's not on the checklist. A good policy is to touch, feel, tug on, move, and test everything you come into contact with all the way around. ![]()
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