WILLIAMSPORT, Pen., July 20, 2026 – Lycoming Engines today announced the release of Service Instruction 1009BF, expanding Time Between Overhaul (TBO) intervals to 2600 hours for a broad range of Lycoming factory‑new and factory‑rebuilt engines. This enhancement reflects Lycoming’s continued commitment to advancing engine durability and lowering lifecycle costs for operators.
The new 2600‑hour TBO applies to multiple engine families, including the O‑320, IO‑320, O‑360, IO‑360, IO‑390, O‑540, and IO‑540 series, when operated and maintained in accordance with all applicable Lycoming technical publications and FAA airworthiness requirements.
Benefits of the Extended 2600‑Hour TBO:
- Lower operating costs – The 2600‑hour interval reduces overhaul frequency, delivering significant cost savings over the engine’s service life.
- Greater aircraft availability – The added 600 hours of operating margin supports increased fleet utilization for training, private, and commercial operators. Offering an additional 400 hours to previous base TBO on fixed wing aircraft and an additional 300 hours to previous base TBO on rotor craft.
- Proven performance – Extended intervals are backed by endurance testing and fleet data confirming strong durability under compliant operating conditions.
“Lycoming’s updated TBO schedule represents our ongoing focus on delivering maximum value, reliability, and performance to aircraft owners, operators, and maintainers,” said Jim Wright, Senior Vice President of Lycoming Engines. “This enhancement reflects decades of engineering experience combined with the latest fleet data.”
Safety and Compliance
Service Instruction 1009BF includes updated cautions, parts guidance, and clear instructions for engines affected by AD 2012‑19‑01. The FAA has approved the instruction as an AMOC for specific provisions of the AD, providing a transparent path for operators choosing to adopt the extended intervals.
For more details and to download a copy of SI-1009BF, visit Lycoming Engines.
