Service Letter No. L291
Service Letter No. L291
DATE:
September 23, 2025
TO:
All Owners and Operators of TIO-540-AK1A Engine Model
Service Instruction No. 1129 E
Supersedes Service Instruction No. 1129D
September 23, 2025
MODELS AFFECTED
All Lycoming direct drive engine models
TIME OF COMPLIANCE
During periodic maintenance inspection of the engine and at anytime the alternator or generator belt is installed.
REASON FOR REVISION
Added 14 millimeter wide belt and torque values to table 1.
This Service Instruction provides Instructions for Continued Airworthiness (ICA).
Service Instruction No. 1080 D
Supersedes Service Instruction No. 1080 C
September 23, 2025
MODELS AFFECTED
All Lycoming opposed series aircraft engines.
TIME OF COMPLIANCE
During periodic inspection of the engine.
Service Instruction No. 1304 K
Supersedes Service Instruction No. 1304 J
August, 2025
MODELS AFFECTED
All Lycoming aircraft engines.
TIME OF COMPLIANCE
When a data plate is lost, contains incorrect information, becomes illegible, or an engine modification affects model designation.
PC-CC363I/CC363I-FP Illustrated Parts Catalog
DATE RELEASED:
August 2025
TITLE:
Illustrated Parts Catalog for Cub Crafters CC363i (Lycoming YIO-360-EXP128) and Cub Crafters CC363i-FP (Lycoming YIO-360-EXP304)
DOCUMENT PART NUMBER:
PC-CC363I/CC363I-FP
Special Service Publication No. 112-15
Special Service Publication No. 112-15
SSP-112-15
Date: July, 2025
Updated list of Service Bulletins, Letters, and Instructions.
Special Service Publication No. 110-3
Special Service Publication No. 110-3
SSP-110-3
Date: July, 2025
CERTIFICATED AIRCRAFT ENGINES
Service Instruction No. 1037AA
Service Instruction No. 1037AA
Date: July, 2025
SUBJECT:
Approved Pistons, Rings, Cylinders, and Gasket Set Application for Use on
Lycoming Aircraft Engines
MODELS AFFECTED:
All Lycoming opposed series aircraft engines in Table 1.
TIME OF COMPLIANCE:
When installing new rings, pistons, valves and cylinders.
Service Bulletin No. 342 H
Service Bulletin No. 342 H
Date: July, 2025
SUBJECT:
Fuel Line (Stainless Steel Tube Assy.) and Support Clamp Inspection and Installation.
MODELS AFFECTED:
All fuel injected Lycoming engines indicated in fuel line and clamping diagrams.
TIME OF COMPLIANCE:
Examine fuel lines every 100 hours, annual inspection, overhaul and any time fuel lines or clamps are serviced, removed, or replaced.
Service Instruction No. 1594
Service Instruction No. 1594
DATE:
July, 2025
MODELS AFFECTED:
Lycoming O-235 Engine Models listed in Table 1
TIME OF COMPLIANCE:
During every scheduled maintenance event