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 Service Instruction No. 1191.       
72-30 2) Check for oil leaks around the rocker-box covers. If necessary replace the seal and torque screws - refer to 20-00-01 201. 100  X X X X 
72-30 3) Check that there is no evidence of overheat on the cylinders, indicated by burnt paint. In this case a fault exists inside the cylinder, and this must be repaired before returning the aircraft to service. 100  X X X X 
72-30 4) Marked discoloration and seepage around the cylinder heads and cylinder barrel joints are usually due to the seepage of threading grease used at the factory for assembly of the cylinder or to slight gazeous leaks which will disappear once the cylinder has been operated for some time. 100  X X X X 
72-30 5) In this case, neither the operation nor the performance of the engine is affected. If the leaks are more serious, replace the cylinder. 100  X X X X 
72-30 6) Check cylinders visually for cracked or broken fins. 100   X X 0 NOTE 1
72-30 7) Remove the rocker box covers. Check the rockers for freedom of movement when the valves are closed. 100    X  400 hrs

NOTE 1 : If a 100-hr. inspection has been carried out during the last 3 months, do not perform the operations identified with a "0" unless the annual inspection replaces a 100-hr. inspection. For US registered aircraft, perform all operations.
 

ATA OPERATIONS  INSPECTIONS
  Area 1st
25 hrs 50
hrs 100
hrs Major Ann. Other
72-30 8) 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 100    X x x x x x x x x X  400 hrs
 (including the piston and connecting rod assembly) for further investigation.       
72-30 9) Replace any parts that do not conform with limits indicated in the latest issue of 100      400 hrs
 LYCOMING SSP 1776.       
72-30 10) Apply the latest issue of LYCOMING 100      400 hrs
 Service Bulletin 388 about valve guide
clearance check.       
73-00 FUEL SYSTEM AND CONTROLS       
73-00 General       
73-00 1) Check the fuel system for leaks and security of the clamps. 100  X X  0 NOTE 1
　
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