Service Bulletin No. 630B
Service Bulletin No. 630B
(Supersedes Service Bulletin No. 630A)
June 11, 2025
MODELS AFFECTED:
All Lycoming engines
TIME OF COMPLIANCE:
At every maintenance event that requires removal of each cylinder
Service Instruction No. 1593
Service Instruction No. 1593
Incorrectly marked alternator belts.
DATE:
May 12, 2025
MODELS AFFECTED:
TEO-540-C1A
TIME OF COMPLIANCE:
N/A
This Service Instruction is in response to incorrectly marked alternator belts having reached the field on engines or as spare parts.
Service Bulletin No. 656A
REPLACEMENT OF 6-CYLINDER ELECTRONIC IGNITION SYSTEM (EIS)
DATE:
April 2, 2025
MODELS AFFECTED:
All 6-cylinder EIS used in a helicopter application operating in any category
Service Letter No. L 162 B
Service Letter No. L162B
(Supersedes Service Letter No. L162A)
DATE RELEASED:
January 29, 1982
TO:
All Owners, Operators and Service Facilities
Service Bulletin No. 661
Service Bulletin No. 661
STD-35 Plain Washer Replacement
February 20, 2025
MODELS AFFECTED
All Lycoming Reciprocating Aircraft Engines
TIME OF COMPLIANCE
At overhaul or at the next maintenance event which requires removal of STD-35 plain washers, whichever occurs first.
Service Bulletin No. 659
Service Bulletin No. 659
STD-33 Plain Washer Replacement
February 20, 2025
MODELS AFFECTED
All Lycoming Reciprocating Aircraft Engines
TIME OF COMPLIANCE
At overhaul or at the next maintenance event which requires removal of STD-33 plain washers, whichever occurs first.
Service Bulletin No. 648 C
Service Bulletin No. 648C
Wastegate Solenoid Valve Inspection and Cleaning
February 20, 2025
MODELS AFFECTED
TEO-540-C1A
TIME OF COMPLIANCE
During each scheduled oil change
REASON FOR REVISION
Added new NOTICE and steps 6 and 7 to the procedure for Helicoil® inspection. Added sentence that S.B provides ICA.
IO-540-AG1A5 Series Engine Installation and Operation Manual
DATE RELEASEED:
November 2012
TITLE:
IO-540-AG1A5 Series Engine Installation and Operation Manual
DOCUMENT PART NUMBER:
60297-45
MODELS AFFECTED:
IO-540-AG1A5 Series
YO-233-B2A Series Engine Installation and Operation Manual
DATE RELEASEED:
December 2013
CURRENT REVISION:
November 2014
TITLE:
YO-233-B2A Series Engine Installation and Operation Manual
DOCUMENT PART NUMBER:
60297-40 & 60297-40-B
MODELS AFFECTED:
YO-233-B2A Series
IO-540-AF1A5 Operation and Installation Manual
DATE RELEASEED:
February 2008
TITLE:
IO-540-AF1A5 Operation and Installation Manual
DOCUMENT PART NUMBER:
60297-33
MODELS AFFECTED:
IO-540-AF1A5