DATE RELEASED

April 21, 2026

SUBJECT

Reprint of Slick/Champion Aerospace Service Bulletin SB2-19B

MODELS AFFECTED

All Lycoming 4 and 6-cylinder engines equipped with Impulse Coupled Magnetos identified in the Magneto Models Affected section of the attached Slick/Champion Aerospace Service Bulletin SB2-19B.

TIME OF COMPLIANCE

Refer to the Compliance section of the attached Slick/Champion Aerospace Service Bulletin SB2-19B

DATE RELEASED:

March 2026

TITLE:

IO-360-B4A Illustrated Parts Catalog Rev. 1

DOCUMENT PART NUMBER:

PC-IO-360-B4A

DATE RELEASED:

March 2026

TITLE:

TIO-540-AK1A Illustrated Parts Catalog Rev. 1

DOCUMENT PART NUMBER:

PC-TIO-540-AK1A

DATE RELEASED

March 12, 2026

SUBJECT

Piston Pin Replacement

MODELS AFFECTED

All Lycoming Engines or Cylinder Kits using LW-13445 Piston Pins, or Spare LW-13445 Piston Pins with an 8130-3 dated between January 7, 2021, and December 15, 2025.

TIME OF COMPLIANCE

Refer to Required Action.

REASON FOR REVISION

Corrected Date Range in models affected and paragraph one.

DATE

February 10, 2026

SUBJECT

New Connecting Rod Bushing

MODELS AFFECTED

All Lycoming Engine Models

TIME OF COMPLIANCE

As Required

REASON FOR REVISION

Updated Figure 1 to show the notch and split in the connecting rod bushing. Revised the first paragraph. Deleted NOTICE that referenced previous part number. Referenced bushing split in Step F.

DATE

February 10, 2026

MODELS AFFECTED

0-235 and 0-290 Series Engines

TIME OF COMPLIANCE

During engine overhaul or earlier

REASON FOR REVISION

Updated part number

DATE

February 10, 2026

MODELS AFFECTED

All Lycoming opposed series aircraft engines.

TIME OF COMPLIANCE

When preservation oil is removed or when lubricating oil is changed or added.

REASON FOR UPDATE

Updated lubrication oils and temperature ranges.

DATE:

February 10, 2026

MODELS AFFECTED:

TEO-540-C1A

TIME OF COMPLIANCE:

At next maintenance event

DATE:

February 10, 2026

MODELS AFFECTED:

All Lycoming reciprocating aircraft engines

TIME OF COMPLIANCE:

BEFORE FURTHER FLIGHT

REASON FOR REVISION

Added an item to the “A propeller strike includes:” section. Added a new NOTICE in the “Recommended Corrective Action for Propeller Strikes”
section. Changed 17-grit to 150-grit in both checklists.
 

DATE:

January 28, 2026

SUBJECT:

Approved Spark Plugs

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.