Service Instruction No. 1442 A
Improved Oil Filter Bypass Valve
Supersedes Service Instruction No. 1442
March 28, 2011
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.
Get It Exchanged
Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.