6 February 2026

Lycoming Piston Aircraft Engines

Lycoming, Service Instruction 1042AI, approved spark plugs, Lycoming piston engines, aircraft engine maintenance, aviation service instruction, spark plug replacement, general aviation engines

In case you missed it: Lycoming issued Service Instruction No. 1042AI regarding approved spark plugs, affecting all Lycoming piston aircraft engines, as of January 28, 2026.

MODELS AFFECTED:

All Lycoming piston aircraft engines

TIME OF COMPLIANCE:

As required for replacement

REASON FOR REVISION:

Added Lubricating Spark Plug Ignition Leads section. Added an “A” to some engine models for Champion REM 40E in Tables 2 and 3. Added an “A” for several engine models for Tempest spark plugs in Tables 2, 4, and 5. Added an “A” to 390 and 580 engine models for Champion REM 32E in Tables 4 and 5.

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