Service Bulletin No. 634

Cylinder and Head Assembly Serviceable Life
DATE:

October 11, 2018

SUBJECT:

Cylinder and Head Assembly Serviceable Life

MODELS AFFECTED:

All Lycoming Engines with Parallel Valve Cylinder and Head Assemblies (Table 1) shipped from Lycoming Engines between 1-SEP-2013 and 30-APR-2015 (excludes O-235 series)

TIME OF COMPLIANCE:

During Cylinder and Head Assembly removal for condition or overhaul

Service Instruction No. 1571

Lockplate installation for Induction Housing on TIO-540-AJ1A and IO-540-AC1A5
DATE:

August 23, 2018

SUBJECT:

Lockplate installation for Induction Housing on TIO-540-AJ1A and IO-540-AC1A5

MODELS AFFECTED:

TIO-540-AJ1A, IO-540-AC1A5

TIME OF COMPLIANCE:

Required at next Overhaul, or at owner’s discretion.

Service Letter No. 247 J

SHELF LIFE REQUIREMENTS
DATE:

August 23, 2018

TO:

All Owners and Operators of Lycoming Engines Aircraft Engines

SUBJECT:

Shelf Life Requirements

REASON FOR REVISION:

Added part numbers 37B19774-472, LW-12008, and STD-1934 to Table 1; Removed part number 951392 from Table 2; added part number AV951392 to Table 2

Service Instruction No. 1570 A

Alternate Oil Sump Fitting Configuration for Aerobatic Inverted Oil System
DATE:

August 3, 2018

SUBJECT:

Alternate Oil Sump Fitting Configuration for Aerobatic Inverted Oil System

MODELS AFFECTED:

IO-540-K1K5 Engines Installed in ENAER T-35 Pillan Aircraft

TIME OF COMPLIANCE:

As required by the aircraft manufacturer, based on parts availability*

REASON FOR REVISION:

Added additional section detailing the Servicing of Engine Oil

Service Letter No. 275 A

Warranty Procedure for Exhaust System Replacement Referenced in the most current revision of SB 627 
DATE:

May 17, 2018

TO:

All Owners and Operators of Lycoming Engines Model TIO-540-AJ1A

SUBJECT:

Warranty Procedure for Exhaust System Replacement Referenced in the most current revision of SB627

REASON FOR REVISION:

Updated language to refer to the most current revision of SB627

Service Bulletin No. 627 E

EXHAUST SYSTEM INSPECTION
DATE:

May 17, 2018

SUBJECT:

Exhaust System Inspection

MODELS AFFECTED:

Lycoming Engine Model TIO-540-AJ1A

TIME OF COMPLIANCE:

If the Exhaust System is not replaced per this revision, after the initial Exhaust System Inspection, continue with subsequent repetitive Exhaust System Inspections per Table 2 in this Service Bulletin

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