Service tasks

W In engines with an oil filter, after changing after the initial 50 hours, total oil exchange

Operating time for maintenance inspections:

• leaded gasoline: 50 hours*
• unleaded gasoline: 100 hours*

Oil filter replacement (after a transitional period)

Operating time for maintenance inspections:

• leaded gasoline: 50 hours
• unleaded gasoline: 50 hours

In engines with oil pressure screen, after introducing any changes resulting from the transition period, total oil exchange.

Operating time for maintenance inspections:

• leaded gasoline: 25 hours*
• unleaded gasoline: 50 hours*

Replacement / supervision / cleaning of the oil pressure screen (after changes resulting from the transitional period)

Operating time for maintenance inspections:

• leaded gasoline: 25 hours
• unleaded gasoline: 25 hours

*Or every 4 months, whichever is the first; also: remove, check, clean and reinstall the oil suction screen.
Guidelines relating to the supervision of the oil filter and components of the oil pressure screen can be found in the Operating Bulletin No. 480. Operational Letter Lycoming No L 270

This Operational Letter emphasizes the benefits of an extended inspection period as a routine application for unleaded gasoline presented in the latest edition of the Operational Manual No. SI-1070 for Lycoming engine models.