iE2 Series EECS Engine Wiring Harness Inspection and Repair Manual
DATE RELEASED:
January 2026
TITLE:
iE2 Series EECS Engine Wiring Harness Inspection and Repair Manual
LYCOMING PART NUMBER:
IRM-iE2
TEO-540-C1A Engine Installation & Operations Manual Rev 5
TEO-540-C1A Engine Installation & Operations Manual
DATE RELEASED:
January 2026
TITLE:
TEO-540-C1A Installation & Operations Manual Rev 5
DOCUMENT PART NUMBER:
IOM-TEO-540-C1A Rev 5
TEO-540-C1A Engine Maintenance Manual Rev 5
DOCUMENT PART NO. MM-TEO-540-C1A
DATE RELEASED:
January 2026
TITLE:
TEO-540-C1A Maintenance Manual Rev 5
DOCUMENT PART NUMBER:
MM-TEO-540-C1A Rev 5
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Service Letter No. L 114 BL
SERVICE LETTER NO. 114 BL
RECIPROCATING ENGINE AND ACCESSORY MAINTENANCE PUBLICATIONS
DATE:
January 15, 2026
TO:
Owners and Operators of Lycoming Aircraft Engines
Service Letter No. L299
Service Letter No. L299
DATE:
January 5, 2026
TO:
Owners and Operators of Lycoming IO-390-C3B6 Engine Models Installed on Cirrus Aircraft
Service Instruction No. 1368 A
Supersedes Service Instruction No. 1368
November 24, 2025
MODELS AFFECTED
All O-320-H2AD 76 series engines.
TIME OF COMPLIANCE
Whenever oil leakage occurs at the tachometer adapter seal.
REASON FOR REVISION
Split Step 1 into 2 steps. Added new Figure 1 to identify part numbers.
Special Service Publication No. 525
Special Service Publication No. 525
SSP-525
Date: November 2025
Service Instruction No. 1481 C
Supersedes Service Instruction No. 1481B
November 24, 2025
MODELS AFFECTED
All Lycoming reciprocating aircraft engines shipped from the Lycoming Engines factory after effective date of this Service Instruction.
TIME OF COMPLIANCE
Not applicable.
REASON FOR REVISION
Revised the entire service instruction.
Service Letter No. 298
Service Letter No. L298
DATE:
November 18, 2025
TO:
Owners and Operators of Lycoming TEO-540-C1A Engines
Service Instruction No. 1443 T
DATE:
November 18, 2025
SUBJECT:
Approved Slick Magnetos, Hartzell PowerUp Magnetos, and Lycoming Electronic Ignition System (EIS) on Lycoming Engines
MODELS AFFECTED:
See Table 1
TIME OF COMPLIANCE:
Not applicable
REASON FOR REVISION:
Revised Table 1 to add approved Hartzell PowerUp magnetos. Added listings for IO-540-C1B5 and IO-540-S1A5 to Table 1 and Table 7. Added new Table 5 for Hartzell PowerUp to Lycoming cross reference.