Service Instruction No. 1509

Replacement of all P/N STD 1409 Nuts with P/N STD-2249 Nuts

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DATE: April 25, 2003

MODELS AFFECTED

All Lycoming aircraft engines.

TIME OF COMPLIANCE

Whenever a P/N STD-1409 nut is removed from the crankcase parting line in the sump or from any other application on the engine.

Any time a P/N STD-1409 nut is removed from the crankcase parting line in the sump or from any other location (such as the oil pump body on TIO and TIGO-541 models, the magnetos and oil pump support on VO-360 and IVO-360 models, the oil suction tube on O-235 and O-320 models, and other applications), it should be replaced with P/N STD-2249 slotted nut.

Get It Exchanged

Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.