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74-10 52) Check breaker points for pitting and minimum gap. 100  
74-10 53) Check for excessive oil in the breaker compartment ; if found, wipe dry with a clean lint-free cloth. 100  
74-10 54) The felt located at the breaker points should be lubricated in accordance with the magneto manufacturer's
instructions. 100  
74-10 55) Check magneto to engine timing. 100  
74-20 56) Remove and thoroughly inspect the upper and lower spark plugs. If the spark plugs are fouled, clean and adjust gap, then permute upper and lower spark plugs -refer to 74-20-02 201. 100  
74-20 57) Check the conductors and the ceramics for corrosion and deposits. 100  
 Clean the cable ends, spark plug walls and ceramics with a dry clean cloth or a clean cloth moistened with methyl-ethyl-ketone. Dry.   
74-20 58) Check ignition harness clamps for security and spark plug and magneto terminals for tight connection. 100  

AIAA
Validity : S / N 1 - 9999 05-20-05 (JA) Page 228
JUN 01
 

ATA "80A" MAJOR INSPECTION
ENGINE COMPARTMENT INSPECTION (AREA 100) AREA OTHER
INSPECTION PERFORMED
BY
72-00 59) Perform an overhaul of the engine. 100 Refer to 
    05-10-00  
72-30 60) Check cylinders visually for cracked or broken fins. 100  
72-30 61) Remove the rocker box covers. Check the rockers for freedom of movement when the valves are closed. 100 400 hrs 
72-30 62) Look for evidence of abnormal wear or broken parts in the area of the valve tips, valve keeper, springs and spring seats. If any indications are found, the cylinder and all its components should be removed (including the piston and connecting rod assembly) for further investigation. 100 400 hrs 
72-30 63) Replace any parts that do not conform with limits indicated in the latest issue of LYCOMING SSP 1776. 100 400 hrs 
72-30 64) Apply the latest issue of LYCOMING Service Bulletin 388 about valve guide clearance check. 100 400 hrs 
79-00 65) Visually inspect the lubrication lines and connections on the engine cases and on the oil cooler(s), check the attach fittings and look for impact marks, wear, cracks and leaks. 100  
79-10 66) Visually inspect the engine oil filler port, the oil gage and the base for leaks, and check attach fittings. 100  
79-20 67) Visually inspect oil cooler(s), support(s), attach fittings. 100  
 Look for cracks and evidence of leaks.   
79-20 68) Check engine crankcase breather for obstruction. 100  
　
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