Service Bulletin No. 647
Incorrect Markings on Service Tool# ST-310

December 14, 2021

MODELS AFFECTED

Lycoming Engines that have been inspected using the Incorrectly Marked Tool

TIME OF COMPLIANCE

Upon receiving this Service Bulletin

SERVICE INSTRUCTION NO. 1582 A

DATE:

November 22, 2021

SUBJECT:

Fuel Injector Replacement

MODELS AFFECTED:

Lycoming TEO-540-C1A

TIME OF COMPLIANCE:

At the first replacement of Fuel Injector P/N 61X26294-CT

SERVICE INSTRUCTION NO. 1573E

DATE POSTED:

November 22, 2021

SUBJECT:

Lycoming TEO-540 Engine Series Approved Engine Configurations

MODELS AFFECTED:

Refer to Table 1

TIME OF COMPLIANCE:

As Required for Inspection/Maintenance/Replacement

TEO-540-C1A Engine Installation & Operations Manual

DOCUMENT PART NO. IOM-TEO-540-C1A REV 4

DOCUMENT PART NO. IOM-TEO-540-C1A

DATE RELEASED:

November 2021

TITLE:

TEO-540-C1A Installation & Operations Manual Rev 4

DOCUMENT PART NUMBER:

IOM-TEO-540-C1A Rev 4

DOCUMENT PART NO. MM-TEO-540-C1A

DATE RELEASED:

November 2021

TITLE:

TEO-540-C1A Maintenance Manual Rev 4

DOCUMENT PART NUMBER:

MM-TEO-540-C1A Rev 4

SERVICE INSTRUCTION NO. 1585

DATE:

November 19, 2021

SUBJECT:

Oil Cooler Bypass Valve Assembly Replacement

MODELS AFFECTED:

Lycoming TEO-540-C1A

TIME OF COMPLIANCE:

At next scheduled maintenance event, or earlier at owner’s discretion

Service Bulletin No. 645
Small End Connecting Rod Bushing Inspection

September 24, 2021

MODELS AFFECTED

Engines with a serial number listed in Table 1 of this Service Bulletin

TIME OF COMPLIANCE

Within the next 10 hours of engine operation.

Service Bulletin No. 643

Crankcase Nut Safety Wire Inspection

September 16, 2021

MODELS AFFECTED

Lycoming engines identified in Tables 1 and 2

TIME OF COMPLIANCE

Aerobatic engines – within the next 10 hours of operation or next scheduled maintenance event, whichever occurs first (Table 1).
Non-aerobatic engines - within the next 50 hours of operation or next scheduled maintenance event, whichever occurs first (Table 2)

SERVICE LETTER NO. L285

Change in cylinder configuration for O-235-C, -E, and -H Series engines

DATE:

August 25, 2021

TO:

All Owners and Operators of Lycoming O-235-C, -E, and -H Series engines

REASON FOR PUBLICATION:

Lycoming supplied cylinders for O-235-C, -E, and -H Series engines were previously plain steel, straight-bore cylinders. This design has been replaced with nitrided, choke-bore cylinders.

SERVICE INSTRUCTION NUMBER 1037 Y

SUBJECT

Approved Pistons, Rings, Cylinders, and Gasket Set Application for Use on Lycoming Aircraft Engines

DATE

August 25, 2021

MODELS AFFECTED

All Lycoming opposed series aircraft engines in Table 1

TIME OF COMPLIANCE

When installing new rings, pistons, valves, and cylinders