SIL Turbine Index

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INDEX – SERVICE INFORMATION LETTERS, TURBINE June 30, 2026 Superseding April 8, 2026 Page 1 of 3 SIL # DATE REV. DATE TITLE EFFECTIVITY TH-28 480 480B CANCELED T-001 09/11/95 GENERATOR SWITCH OPERATION X X T-002R8 CXL SERVICE LIFE LIMITS X X X X10 T-003 06/21/96 ENGINE OIL WARNING PLACARD X X T-004 CXL IMPROVED TAIL ROTOR FEATHERING AXIS BUMPER, P/N 28- 15033-13 X X X T-005 CXL MAIN AND TAIL ROTOR TRANSMISSION CHIP INDICATIONS ON NEW OR RECENTLY OVERHAULED TRANSMISSIONS X X X T-006 10/03/97 IMPROVED FUEL SHUTOFF VALVE OPERATION X X T-007 12/11/97 DRAIN HOLE INSTALLATION IN CABIN DOORS X X T-008 12/10/98 ALTERNATIVE SPAR FITTING ATTACHMENT X X T-009 CXL ALLISON ENGINE MODEL 250-C20W X X X T-010 CXL CYCLIC STICK SOCKET INSTALLATION REPAIR X X X T-011 03/31/99 MAIN ELECTRICAL RELAYS X X T-012 03/31/99 MAIN ROTOR TRANSMISSION PINION NUT RETORQUE X X T-013 04/06/99 SERIALIZATION OF VIBRATION ABSORBER BEAMS X X T-014 03/20/00 GENERATOR CONTROL UNIT RELOCATION X T-015 02/15/02 TAIL ROTOR TRANSMISSION IDENTIFICATION X X X T-016 CXL DRIVE BELT TENSION X X X X9 T-017 08/05/02 ELECTRICAL SYSTEM PYLON GROUNDS X X X T-018 06/16/03 FUEL CELL LEAKS X X X T-019 CXL MAIN ROTOR PUSH-PULL ROD, P/N 4140532-“X”, SERVICEABILITY INSPECTION X X X X8 T-020 CXL FIXED LENGTH TAIL ROTOR PITCH CHANGE LINK, P/N 28-16391- 1 X X X X7 T-021 CXL ELASTOMERIC MAIN ROTOR DAMPER KIT X X X T-022 01/31/05 OIL LUBRICATED LOWER PULLY BEARINGS X X X T-023 CXL MODIFIED PROCEDURE FOR ATTACHING MAIN ROTOR RODS TO THE LOWER SWASHPLATE ASSEMBLY X X X X6 T-024 05/02/07 ENGINE COOLING KIT X T-025 05/04/07 MAIN ROTOR DAMPER OIL PART NUMBER X X X T-026 05/08/07 TAIL ROTOR THRUST BEARING, P/N ECD002-11 X X X T-027R4 10/18/07 11/10/17 TAIL ROTOR P/C LINK INSTALLATION X X T-028R1 02/11/08 09/05/18 LANDING GEAR FAIRING ASSEMBLY X X X T-029 03/25/08 BELT TENSION AND PULLEY ALIGNMENT RECORD X X X T-030 05/12/08 MAIN ROTOR GEARBOX BOLT RETORQUE X X X UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www.enstromhelicopter.com to register for email notification of updates. INDEX – SERVICE INFORMATION LETTERS, TURBINE June 30, 2026 Superseding April 8, 2026 Page 2 of 3 SIL # DATE REV. DATE TITLE EFFECTIVITY TH-28 480 480B CANCELED T-031 11/06/08 RELAY KIT INSTALLATION X X X T-032 CXL 600 HOUR INSPECTION TERMINATION FOR SWASHPLATE AND CONTROL ROD ASSEMBLIES X X1 T-033 CXL GREASE RECOMMENDATIONS FOR ROTOR SYSTEM BEARINGS X X X X2 T-034R1 11/25/08 01/05/10 SLIDING WINDOW INSTALLATION X X X T-035 05/04/09 IDENTIFYING CORROSION SEVERITY ZONE FOR OPERATING ENVIRONMENT X X X T-036 03/19/10 BEARING TEMPERATURE WARNING UNIT X X X T-037 10/23/09 FAILURE OF THE ENGINE DRIVE SHAFT SUPPORT BEARING (ECD4017), THE OVERRUNNING CLUTCH DUPLEX SUPPORT BEARING (ECD4014), AND/OR THE P/N 23063426 DOUBLE LIP SEALS X X X T-038R1 03/22/10 04/08/26 APPLICATION OF CORROSION PREVENTION COMPOUND X X X T-039 03/22/10 HI/LO ROTOR RPM SWITCH INSTALLATION X X T-040 03/26/10 DUAL INDICATING VOLT-AMMETER X T-041R1 01/20/11 02/15/19 BLADE TAPE REPAIR X X X T-042 01/20/11 BLADE INTERCHANGEABILITY AND IDENTIFICATION X X X T-043 CXL TORQUE INDICATION CHECK PROCEDURE X X X X3 T-044 02/23/11 LINEAR ACTUATOR AND DROOP COMPENSATOR RIGGING X X X T-045 03/30/11 RESTRAINING CARGO IN THE CABIN X X X T-046 CXL LOWER DRIVE NUT TORQUE REQUIREMENT X X X X4 T-047 CXL TAIL ROTOR PITCH CHANGE BEARING LUBRICATION METHOD X X X X5 T-048 06/22/11 RETRACTION NOTICE, MAINTENANCE MANUAL SUPPLEMENT 4 X X T-049 07/07/11 SPECIAL INSPECTIONS FOR AGRICULTURAL AIRCRAFT X X T-050 08/19/11 MAIN ROTOR SYSTEM TRACKING X X X T-051R2 09/20/11 11/07/17 VENTED CLUTCH OIL RESERVOIR KIT P/N 4230001 X X X T-052 10/10/11 CLAMP INSTALLATION X X X T-053R1 09/28/12 09/22/15 7641-20 VRLA BATTERY OPTION X X T-054R1 10/31/12 11/16/22 FUEL CELL FOAM BAFFLE MAINTENANCE INSTRUCTIONS X X T-055R1 02/04/13 04/04/13 T-0139 CALIBRATION REFERENCE BAR X X T-056 04/15/14 UPPER SWASHPLATE BEARING HOUSING X X T-057 01/09/14 BREATHER TUBE ASSEMBLY X X T-058 01/23/14 INSPECTION AND REPAIR OF MINOR CABIN ROOF BUBBLES X T-059 CXL PRODUCTION CERTIFICATE X X X X11 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www.enstromhelicopter.com to register for email notification of updates. INDEX – SERVICE INFORMATION LETTERS, TURBINE June 30, 2026 Superseding April 8, 2026 Page 3 of 3 SIL # DATE REV. DATE TITLE EFFECTIVITY TH-28 480 480B CANCELED T-060R2 03/07/14 8/21/19 LANDING LIGHT UPGRADE X T-061R2 07/31/15 08/07/17 FUEL QUANTITY TRANSMITTER UPGRADE X X T-062 08/20/15 FUEL SYSTEM, DIPSTICK TUBE REMOVAL X X T-063R1 07/08/15 09/05/18 MAIN ROTOR GEARBOX PUMP UPGRADE X T-064 12/10/15 MAIN ROTOR TRANSMISSION 600-HOUR INSPECTION X T-065 03/30/16 BLEED AIR RESTRICTOR X X X T-066R1 06/21/16 05/19/17 GROUND HANDLING WHEEL SADDLE X X T-067R2 11/09/16 5/1/2024 UNIVERSAL BLOCK, P/N 28-14117-11 and P/N 28-14117-13 X X T-068 05/24/17 EASA REGISTRATION OF G1000H-EQUIPPED MODEL 480B HELICOPTERS X T-069 05/24/17 EASA REGISTRATION OF GMA 350H-EQUIPPED MODEL 480B HELICOPTERS X T-070 09/05/18 MAIN ROTOR GEARBOX PUMP UPGRADE X T-071 08/14/19 LAMIFLEX BEARING DISCONTINUATION X T-072 12/02/19 G1000H SYSTEM LOADER CARD SOFTWARE VERSION 1852.05 RELEASE X T-073 10/13/20 PYLON REINFORCEMENT DOUBLER INSTALLATION X X T-074R1 08/12/24 FUEL CELL (BLADDER) ASSEMBLY X X T-075 CXL UPPER PULLEY, P/N 4130538-11 X X X12 T-076 06/24/25 TAIL ROTOR TRANSMISSION (GEARBOX), PREMATURE GEAR WEAR X X Notes 1 Incorporated into the TH-28/480 Series Maintenance Manual (para. 3-2 and 4-40). 2 Incorporated into the TH-28/480 Series Maintenance Manual (para. 4-2). 3 Incorporated into the TH-28/480 Series Maintenance Manual (para. 4-60, B, and 4-61, B).