Service Letter No. L 287

SERVICE LETTER NO. L287
Increased Fuel Economy and Improved Manifold Pressure Stability
DATE POSTED:

August 17, 2021

TO:

Owners and Operators of Lycoming TEO-540-C1A

REASON FOR PUBLICATION:

Announcement to TEO-540-C1A operators for the availability of the new ECU calibration and components to increase the fuel economy and improve the manifold pressure stability. 

Service Bulletin No. 642 A

Service Bulletin No. 642A
Incorrect Piston and Ring Combination

June 16, 2021

MODELS AFFECTED

O-235-C, E & H series, and Factory Cylinder Kit P/N 05K23039

TIME OF COMPLIANCE

Within the next 10 hours of operation or next scheduled maintenance event, whichever occurs first.

REASON FOR REVISION: Deleted NOTICE “Only cylinders that …”. Added CAUTION and instructions for cylinder replacement before the Procedure section. Revised Step 5 in the Procedure section. Revised title and Step 1 in the Warranty Instructions

Service Instruction No. 1569 B

SERVICE INSTRUCTION NO. 1569 B
DATE:

April 21, 2020

SUBJECT:

Installation, Operation, and Maintenance of Lycoming Electronic Ignition System (EIS)

MODELS AFFECTED:

Lycoming 4 and 6-Cylinder piston aircraft engines

TIME OF COMPLIANCE:

At the owner/operator’s discretion.

REASON FOR REVISION:

Revised the SUBJECT line. Formatted pages 4 through 18 to indicate separation between Installation, Operation, and Maintenance chapters. Revised Table 2 – Troubleshooting Guide.

Service Letter No. L 284

SERVICE LETTER NO. L284
Blemish on Cylinder Barrel
DATE:

March 17, 2021

TO:

All Owners and Operators of Lycoming O-235 Series engines

REASON FOR PUBLICATION:

This Service Letter is in response to reports of a blemish in the black oxide coating of P/N 16A26616 Cylinder Assemblies.

Service Letter No. L 283

SERVICE LETTER NO. L283
Alternate Ignition System 
DATE:

February 19, 2021

TO:

All Owners and Operators of Lycoming YO-233 Series engines

REASON FOR PUBLICATION:

This Service Letter is announcing the availability of an alternate ignition system to replace the Champion Aerospace Electronic Ignition System (Lycoming P/N 66K26674-Y) on YO-233 Series engines. Installing this alternate ignition system will maintain the engine's compliance with ASTM F2339.

Service Letter No. L 282

SERVICE LETTER NO. L282
Australian Fuel Testing 
DATE:

December 11, 2020

TO:

Australian Robinson R22 and R44 Owners and Operators

REASON FOR PUBLICATION:

This Service Letter transmits information pertaining to recent engine testing performed on Avgas grades used in Australia and the United States.

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