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©2011 Avco Corporation. All Rights Reserved. Lycoming Engines is a division of Avco Corporation

652 Oliver Street Williamsport, PA 17701 U.S.A. Tel. 570­323­6181 Fax. 570­327­7101 www.lycoming.com

DATE: April 27, 2011 Service Bulletin No. 596 Engineering Aspects are FAA (DER) Approved

SUBJECT: Reprint of AVStar Mandatory Service Bulletin AFS­SB6 Revision 2 MODELS AFFECTED: Lycoming engines referenced in Table 1 in this Service Bulletin and Fuel

Servo models referenced in Attachment A and Lot Numbers of fuel diaphragms and kits referenced in Attachment B in the AVStar Mandatory Service Bulletin AFS­SB6 Revision 2

TIME OF COMPLIANCE: Within the next 5 hours of engine operation

NOTE Incomplete review of all the information in this document can cause errors. Read the entire Service Bulletin to make sure you have a complete understanding of the requirements.

The purpose of this Service Bulletin is to identify all Lycoming engines that could have a faulty fuel diaphragm in fuel servos made or overhauled by AVStar as per the attached AVStar Mandatory Service Bulletin AFS­SB6 Revision 2 dated April 6, 2011. This Lycoming Service Bulletin applies to all of the following: Lycoming Engines shown in Table 1

Any spare part fuel servos of the following model numbers manufactured by AVStar between May 21, 2010 and October 19, 2010; specifically those shown in Attachments A and B in the attached AVStar Mandatory Service Bulletin AFS­SB6: o RSA­5AB1 o RSA­5AD1 o RSA­10AD1 o RSA­10DB1 o RSA­10DB2 o RSA­10ED1 o RSA­10ED2

Any fuel servos, of any make, (AVStar, Bendix, Precision, etc.) overhauled by others using AVStar Value Kit P/Ns: o AVK­5AB1 o AVK­5AD1 o AVK­10AD1 o AVK­10ED1 o AVK­10ED2

Fuel Diaphragms o P/N AV2541801 o P/N AV2541803

MANDATORY SERVICE BULLETIN

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Table 1 Affected Lycoming Engines

Engine Model Engine S/N Fuel System P/N Fuel System S/N IO­360­A1B6 L­10866­51E 73937­70 51728 IO­360­A1B6 L­11619­51E 73937­70 70050502 IO­360­A1B6 L­30856­51E 73937­70 56017 IO­360­A1B6 L­31382­51E 73937­70 70204204 IO­360­A3B6 RL­8571­51E 73937­70 70122706 IO­360­A3B6D L­29442­51E 73937­70 70741105 IO­360­A3B6D L­9677­51E 73937­70 58950 IO­360­C1C L­31091­51E LW­10409­70 59779 IO­360­C1C6 L­12683­51E LW­10409­70 40315 IO­360­C1C6 L­9226­51E LW­10409­70 10926 IO­360­L2A L­13871­51E 61J22088­70 70283305 IO­360­L2A L­26521­51E 61J22088­70 70248507 IO­360­L2A L­28074­51E 61J22088­70 70134206 IO­360­L2A L­29524­51E 61J22088­70 70742402 IO­360­L2A L­30363­51E 61J22088­70 70523709 IO­360­L2A L­30418­51E 61J22088­70 70268006 IO­360­L2A L­32982­51E 61J22088­70 70285102 IO­360­L2A L­9382­51E 61J22088­70 70285309 IO­540­AC1A5 L­29040­48E 61M23429­70 70AM0309 IO­540­AC1A5 L­29462­48E 61M23429­70 70744606 IO­540­C4D5D L­2371­48E 73937­70 82235 IO­540­K1A5 L­26223­48E 75567­70 70427704 IO­540­K1G5 L­10839­48E 75567­70 70B08310 IO­540­K1G5 L­17415­48E 75567­70 70216501 IO­540­K1G5 L­25578­48E 75567­70 34763 IO­540­K1G5 L­26466­48E 75567­70 70155003 IO­720­D1C RL­1466­54A LW­15671­70 70022001 LTIO­540­J2B L­2109­68A LW­11507­70 70017104 LTIO­540­J2B RL­2419­68A LW­11507­70 70784109 LTIO­540­J2BD RL­101­68A LW­11507­70 70157203 LTIO­540­J2BD L­1419­68A LW­11507­70 77528 LTIO­540­J2BD L­2152­68A LW­11507­70 70CE4106 TIO­540­J2B L­11462­61A LW­11507­70 87171200 TIO­540­J2BD L­11253­61A LW­11507­70 70090105 TIO­540­J2BD L­3331­61A LW­11507­70 70166004 Action to Take

1. Identify whether or not any of your engines are on Table 1 or could have the affected fuel servo or fuel diaphragm.

2. If the affected part is on your engine or in your spare parts inventory, do not continue flight. Refer to Options 1, 2, and 3 and Attachment C in AVStar’s AFS­SB6 for directions.

3. Record compliance with this Service Bulletin in your engine logbook.

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