SERVICE LETTER. Figure 1 Form 2629

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Sydney Potter
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652 Oliver Street Williamsport, PA. 17701 U.S.A. Telephone +1 (800) 258-3279 (U.S. and Canada) Telephone +1 (570) 323-6181 (International) Facsimile +1 (570) 327-7101 Email Technicalsupport@lycoming.

1 652 Oliver Street Williamsport, PA U.S.A. Telephone +1 (800) (U.S. and Canada) Telephone +1 (570) (International) Facsimile +1 (570) SERVICE LETTER TO: SUBJECT: Service Letter No. L247H (Supersedes Service Letter No. L247G) July 24, 2017 All Owners and Operators of Lycoming Aircraft Engines Shelf Life Requirements REASON FOR REVISION: Page 1, 3rd paragraph - replaced invoice date with Cure/Mix Date on Form 2629; Revised Figure 1; Deleted Form 2629A (Figure 2) and references thereof since this form is no longer used to enter recertification date during recertification of all non-metallic parts that have less than 1 year of remaining shelf life; Table 1 - Shelf Life updates, Added to Table 1 P/N 37D21992, 69720, and 69828, Removed from Table 1 P/N 02M22269, 05P23087, 75324, 75330, 75689, LW-12154, LW-12434, LW-13377, LW-14246, LW-14467, LW-15490, LW-15569, LW-15859, LW-16217, LW-18101, and LW-19108; Added Table 3 Shelf-Life for Paint, P/N 05P23087 (shelf life update). NOTICE: Incomplete review of all the information in this document can cause errors. Read the entire Service Letter to make sure you have a complete understanding of the requirements. This Service Letter identifies the shelf life of parts used on Lycoming engine models, as well as the PERISHABLE MATERIAL Form 2629 (Figure 1). The shelf life, in calendar quarters (3-month duration), is the length of time a part can be stored on the shelf and be serviceable. Table 1 in this Service Letter identifies the shelf life for parts used on Lycoming engines. Table 2 is a list of part numbers and descriptions for pre-packaged parts from Lycoming Engines suppliers that contain shelf life and cure date information for that part. Table 3 identifies shelf life for paint. Parts sent from Lycoming Engines have a Cure/Mix Date, which is the date that the part was manufactured. The shipped part comes with Cure/Mix Date information as shown on PERISHABLE MATERIAL Form 2629 (Figure 1). The Cure/Mix Date information must stay with the part until the part is assembled on an engine. Figure 1 Form of 8 H 2017 Avco Corporation. All rights reserved. Lycoming Engines is a division of Avco Corporation.

2 NOTICE: This Service Letter does not include parts made from silicone, Teflon, fluorocarbon, or fluorosilicone, which have a shelf life of more than 40 quarters (10 years). Table 1 02G NIPPLE 02M HOSE 02M HOSE 02M HOSE 02M HOSE 02M HOSE 02M HOSE 02M HOSE 02M HOSE 02M HOSE 05P CORROSION INHIBITOR - CRANKSHAFT 06A SEAL 06A SEAL 06B GASKET 06B GASKET 06B GASKET 06B GASKET 06B GASKET 06B GASKET 06B GASKET 06B GASKET 06B GASKET, AIR INLET HOUSING 1027-C 20 GASKET 1691-C 20 GASKET - FUEL PUMP GASKET 37A BELT 37A BELT 37A BELT 37A BELT 37A BELT 37A BELT 37A BELT 37A BELT 37A BELT 37A BELT 37A19773M BELT 37A19773M BELT 37A19773M BELT 2 of 8 H

3 37A19773M BELT 37B BELT 37B BELT 37B BELT 37B BELT 37B BELT 37B BELT 37B BELT 37B BELT 37B BELT 37B BELT 37D BELT 37D BELT SEAL GASKET CUSHION GASKET GASKET GASKET GASKET GASKET GASKET 54E CONVERTER PLATE 54E KIT - CONVERTER PLATE GASKET GASKET GASKET GASKET GASKET GASKET BUSHING GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET 3 of 8 H

4 GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET HOSE GASKET HOSE GASKET - DUAL ACCESSORY DRIVE GASKET - GOVERNOR SPACER GASKET GASKET BUSHING GASKET GASKET GASKET CLIP GASKET HOSE GASKET GASKET GASKET GASKET CLIP GASKET GASKET 4 of 8 H

5 GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET GASKET HOSE HOSE GASKET GASKET GASKET GASKET HOSE GASKET HOSE GASKET GASKET HOSE HOSE RING SEAL GASKET GASKET GASKET GASKET GASKET GASKET GASKET BAFFLE GASKET GASKET GASKET GASKET GASKET GASKET GASKET HOSE GASKET 5 of 8 H

6 GASKET VALVE ASSY GASKET GASKET GASKET GASKET HOSE GASKET GASKET GASKET GASKET DAMPER GASKET GASKET GASKET HOSE GASKET GASKET GASKET GASKET GASKET GASKET HOSE SEAL P50 20 SEAL BAFFLE GASKET GASKET AN6270-3D HOSE ASSY AN6270-3D HOSE ASSY AN6270-3D HOSE ASSY LW GASKET LW GASKET LW GASKET LW GASKET LW HOSE LW SEAL LW P50 20 SEAL LW GASKET LW GASKET LW GASKET 6 of 8 H

7 LW HOSE LW GASKET LW GASKET LW SEAL LW TEE LW GASKET LW GASKET LW GASKET LW GASKET LW GASKET LW GASKET LW GASKET LW SEAL LW GASKET LW GASKET LW HOSE LW GROMMET LW GASKET LW months from DOM* OIL ADDITIVE KIT (6 OZ.) LW SEAL LW GASKET LW BELT LW GASKET LW HOSE LW HOSE - NOZZLE VENT LW HOSE - NOZZLE VENT LW HOSE - NOZZLE VENT LW HOSE - NOZZLE VENT LW HOSE LW HOSE LW GASKET LW GASKET STD SEAL STD SEAL STD HOSE STD SEAL STD GROMMET STD GROMMET STD HOSE STD RING * Month/Year from label on bottle 7 of 8 H

8 STD HOSE STD HOSE STD SEAL STD HOSE STD HOSE STD HOSE STD HOSE STD HOSE Part Number Table 2 Pre-Packaged Parts O-RING O-RING O-RING O-RING PACKING PACKING PACKING PACKING PACKING PACKING PACKING PACKING PACKING Description Table 3 Shelf Life for Paint Part Number Shelf Life Description 05P months from DOM* PAINT * Month/Year from label on bottle 8 of 8 H

REASON FOR REVISION: Added part numbers and revised shelf lives in Table 1 and removed Table 3 P E R I S H A B LE M A T E R I A L.

REASON FOR REVISION: Added part numbers and revised shelf lives in Table 1 and removed Table 3 P E R I S H A B LE M A T E R I A L. 652 Oliver Street Williamsport, PA. 17701 U.S.A. Telephone +1 (800) 258-3279 U.S. and Canada (Toll Free) Telephone +1 (800) 323-6181 International Facsimile +1 (570) 327-7101 www.lycoming.com SERVICE LETTER