Service Instruction No. 1442 A

Supersedes Service Instruction No. 1442

March 28, 2011

MODELS AFFECTED

All Lycoming piston engines with dual magneto accessory housing

TIME OF COMPLIANCE

At next overhaul or evidence of a filter element collapse

This Service Instruction identifies a new spring, P/N 05S21021 that replaces spring P/N 55C21021 in the oil filter bypass valve. This replacement is to be done during overhaul or if oil filter element collapse occurs during cold starts.

Improved Oil Filter Bypass Valve
CTA Heading: 
Get It Exchanged
CTA Description: 
Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.
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https://www.lycoming.com/sites/default/files/Improved%20Oil%20Filter%20Bypass%20Valve.pdf