MODELS AFFECTED: All Lycoming Piston Aircraft Engines
NOTE
Incomplete review of al the information in this document can cause errors. Read the entire Service Instruction to make sure you have a complete understanding of the requirements.
This Service Instruction identifies the established Time Between Overhaul (TBO) for Lycoming piston aircraft engines that have genuine Lycoming parts only. The TBOs, herein, do not apply to Lycoming engine models that contain parts other than those supplied by Lycoming Engines.
The information in this revision of Service Instruction 1009 is approved as an Alternative Means of Compliance (AMOC) for compliance with AD-2012-19-01 paragraphs (f)(1)(i) and (f)(2)(i).
The TBOs take into account service experience, variations in operating conditions, and frequency of operation. However, because of variations in the manner in which engines are operated and maintained, Lycoming Engines cannot give assurance that any individual operator will achieve the TBOs identified herein.
Continuous service assumes that the aircraft wil not be out of service for more than 30 consecutive days. If the aircraft is to be out of service for more than 30 consecutive days, refer to the latest revision of Service Letter L180.
Engine deterioration in the form of corrosion (rust) and the drying out and hardening of composition materials such as gaskets, seals, flexible hoses and fuel pump diaphragms can occur if an engine is out of service for an extended period of time. Due to the loss of a protective oil film after an extended period of inactivity, abnormal wear on soft metal bearing surfaces can occur during engine start. Therefore, al engines that do not accumulate the hourly period of TBO specified in this publication are recommended to be overhauled in the twelfth year.
Table 1 identifies the TBOs for Lycoming engine models used in fixed wing aircraft. Table 2 contains the TBOs for Lycoming engine models used on rotary wing aircraft.
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