R44 Service Letters
Number | Subject | Date |
---|---|---|
R44 SL-89B Supersedes R44 SL-89A | Symmetrical Horizontal Stabilizer Retrofit Kit | 18 MAR 2024 |
R44 SL-88C Supersedes R44 SL-88B | Lycoming Electronic Ignition System (EIS) Reduced Service Life | 01 MAR 2024 |
R44 SL-87 | Cockpit Camera Firmware (Software) Update | 23 JUNE 2023 |
R44 SL-86 | Lycoming Electronic Ignition System (EIS) Retrofit Kit for Helicopters with Provisions | 14 JUNE 2023 |
R44 SL-85 | Tail Rotor Static Balance Equivalent Tool | 16 MAR 2023 |
R44 SL-84 | Lycoming Carbureted Engine Intake Valve Rotator Caps | 12 OCT 2022 |
R44 SL-83 | Engine RPM Sensor Preventive Maintenance | 22 JUL 2022 |
R44 SL-82A Supersedes R44 SL-82 | Tail Rotor Blade Condition and Care | 03 JUN 2022 |
R44 SL-81 | ELT Security | 30 JUN 2021 |
R44 SL-80 | A462-4 Fitting Attachments | 30 JUN 2021 |
R44 SL-79 | Main Rotor Blade Unpainted Leading Edge Care | 13 NOV 2020 |
R44 SL-78 | Field Service Data for Intake Valves | 11 NOV 2020 |
R44 SL-77 | Clutch Actuator Gearmotor Wiring | 11 NOV 2020 |
R44 SL-76A Supersedes R44 SL-76 | C017-4 Swashplate Assembly Spare Parts, and C017-6 revision "AA", "AB", & "AC" Swashplate Assembly Spare Parts | 30 JUN 2021 |
R44 SL-75B Supersedes R44 SL-75A | RHC Instructions for Continued Airworthiness (ICA) Digital Updates | 24 MAR 2023 |
R44 SL-74C Supersedes R44 SL-74B | C792-5 Dual Tachometer | 07 JUL 2021 |
R44 SL-73 | Main and Tail Gearbox Oil | 21 AUG 2020 |
R44 SL-72 | Inspection After Stabilizer Damage | 11 MAR 2020 |
R44 SL-71 | Kannad ELT Service Bulletin | 11 MAR 2020 |
R44 SL-70 | Main Rotor Blade Tip Maintenance | 29 JUL 2019 |
R44 SL-69 | C627-6 Five-point Harness Assembly Lower Strap | 22 MAR 2019 |
R44 SL-68B Superseded by R44 SB-103 | Main Rotor Blade Tip Plate Permanent Removal | 29 JUL 2019 |
R44 SL-67C Supersedes R44 SL-67B | Component Maintenance Course | 04 DEC 2023 |
R44 SL-66 | Gearbox Chip Detector Maintenance | 08 JUN 2018 |
R44 SL-65 | Unauthorized Repairs on Main Rotor Blades in Brazil | 08 JUN 2018 |
R44 SL-64A Supersedes R44 SL-64 | Fire Extinguisher Handling and Maintenance | 20 DEC 2017 |
R44 SL-63A Supersedes R44 SL-63 | Lycoming Engine Connecting Rod Small-end Bushings | 27 JUL 2017 |
R44 SL-62 Supersedes R44 SL-18 | Governor Troubleshooting/Magneto Maintenance | 21 JUL 2017 |
R44 SL-61B Supersedes R44 SL-61A | Riveted A185 Brackets Installation & Fiberglass Scroll Repair | 16 MAR 2023 |
R44 SL-60 | Revised Instrument Marking Metric Decals | 06 JUN 2017 |
R44 SL-59 | High CHT Indication | 06 JUN 2017 |
R44 SL-58 | C258-5 Pitch Link Assembly | 30 JAN 2017 |
R44 SL-57A Supersedes R44 SL-57 | Avionics Software | 20 DEC 2017 |
R44 SL-56 | Genesys Aerosystems (Autopilot) Service Letter | 07 NOV 2016 |
R44 SL-55 | Main Rotor Blade Tip Fasteners | 07 NOV 2016 |
R44 SL-54 | Inhibited Glideslope Reception | 14 JUN 2016 |
R44 SL-53 | Altimeters | 04 APR 2016 |
R44 SL-52 | Full Throttle Caution Light Kit | 08 DEC 2014 |
R44 SL-51A Supersedes R44 SL-51 | B526 (TORX Plus®) Truss Head Screws | 13 OCT 2014 |
R44 SL-50 | D210 Corrosion-Resistant (CRES) Nuts | 13 OCT 2014 |
R44 SL-49 | C016-7 Main Rotor Blades | 10 SEP 2014 |
R44 SL-48 | Precision Airmotive Service Bulletin PRS-109 | 01 AUG 2014 |
R44 SL-47 | Magneto Tachometer Points Wires | 01 AUG 2014 |
R44 SL-46 | Cleanable Air Filters | 03 JUL 2013 |
R44 SL-45 | Deleted Safety Wire | 03 JUL 2013 |
R44 SL-44 | Kannad ELT Service Bulletin Ref. Kannad ELT Service Bulletin S1820514-25-04 | 19 JUL 2012 |
R44 SL-43 | C343-1 Push-Pull Tube Assembly | 30 MAY 2012 |
R44 SL-42 | R44 II Starting Circuit Time-Delay | 30 MAY 2012 |
R44 SL-41 | Ground Handling Wheels and Wheel Supports | 07 SEP 2011 |
R44 SL-40 | MRGB Oil Level Fluctuation | 07 SEP 2011 |
R44 SL-39 | Fuel Servo Diaphragms | 18 AUG 2011 |
R44 SL-38 | Cracked MS21042L-series Nuts | 18 AUG 2011 |
R44 SL-37C Supersedes R44 SL-37B | C016-7 Main Rotor Blade Installation | 05 MAR 2020 |
R44 SL-36 | Bladder Fuel Tank Factory Modification | 17 DEC 2009 |
R44 SL-35A | Servo Plugs | 25 MAR 2009 |
R44 SL-34 | Alternator V-Belts | 22 FEB 2008 |
R44 SL-33 Superseded by R44 SB-79 | Additional Inspection Criteria for Sprag Clutches | 19 DEC 2007 |
R44 SL-32B | A016-4, C016-2, and C016-5 Main Rotor Blade Bond Maintenance Additional Information Regarding Main Rotor Blade Skin Debonding | 20 APR 2010 |
R44 SL-31 | Main Rotor Blade Inspection | 01 JUN 2006 |
R44 SL-30 | Crankshaft Replacement | 20 JUL 2005 |
R44 SL-29 | Optional Four-Point Harnesses with Detachable Shoulder Straps | 15 OCT 2004 |
R44 SL-28 | D040-1 Aft Cowling Assembly | 15 OCT 2004 |
R44 SL-27 | Tail Pipe Extension | 15 OCT 2004 |
R44 SL-26 | Low RPM Warning Horn | 24 NOV 2003 |
R44 SL-25 | Hydraulic Reservoir Vent | 10 JUN 2002 |
R44 SL-24 superseded by R44 SB-72A | Main Rotor Blade Tip Inspection | 21 SEP 2001 |
R44 SL-23 Supersedes R44 SL-16 | Master Battery Relay Upgrade | 01 AUG 2001 |
R44 SL-22 | Belt Tension Actuator Troubleshooting | 10 FEB 2000 |
R44 SL-21 | Stuck Exhaust Valves in Engine | 17 JAN 2000 |
R44 SL-20 | Pitot Line Contact with Push-Pull Tube | 17 JAN 2000 |
R44 SL-19 | Oil Cooler | 16 SEP 1999 |
R44 SL-18 Superseded by R44 SL-62 | Tachometer Contact Assembly in Magneto | 14 APR 1999 |
R44 SL-17 | Collective Spring and Support | 08 SEP 1998 |
R44 SL-16 Superseded by R44 SL-23 | Master Battery Relay | 08 SEP 1998 |
R44 SL-15A | Mixture Control Cable Clamp | 06 OCT 1998 |
R44 SL-14 | Carburetor Modification | 30 MAY 1997 |
R44 SL-13 | Lateral Cyclic Trim Assembly Spring Shaft Wear | 24 OCT 1996 |
R44 SL-12 | Upgraded Battery with Battery Cooling | 24 OCT 1996 |
R44 SL-11 | Replacement of A185-2 and -5 Brackets | 25 OCT 1996 |
R44 SL-10 Supersedes R44 SL-05 | C439-7 Guide Assembly | 02 AUG 1996 |
R44 SL-09A | Cyclic Trim System | 02 MAY 1996 |
R44 SL-08 | Cyclic Trim Elastic Cord | 26 DEC 1995 |
R44 SL-07 | Cyclic Friction | 26 DEC 1995 |
R44 SL-06 | Autorotation RPM Adjustment | 05 MAY 1995 |
R44 SL-05 Superseded by R44 SL-10 | Inspection of Push-Pull Tube Guides | 04 NOV 1994 |
R44 SL-04 | Engine Breather Coupling | 07 SEP 1994 |
R44 SL-03 | Cyclic "Shot Bag" Damper | 28 JUL 1994 |
R44 SL-02 | Air Intake Hose Chafing Frame | 30 JUN 1994 |
R44 SL-01 | Adjustment of Main Rotor Spindle Boot and Fluid Level | 24 MAY 1994 |
R44 Service Letters to Selected Owners
Number | Subject | Date |
---|---|---|
N/A | Raven II Fuel Control P/N 2576630-1 | 09 MAY 2003 |
N/A | Governor Controller | 20 MAR 2003 |
N/A | PRV/Topping Valves | 22 JAN 2003 |
N/A | Mixture Guard | 19 DEC 2002 |
N/A | Tailcone Battery Retention Straps | 31 AUG 2000 |
N/A | Pop-Out Float Covers | 31 JUL 2000 |
N/A | 28-Volt National Airparts Alternator Bolts | 08 JUL 1999 |
N/A | Spindle Removal and Installation Fixture MT152-1 | 11 NOV 1998 |
N/A | Lateral Trim Spring Assembly | 09 OCT 1998 |
N/A | Swashplate Assembly | 16 FEB 1998 |
N/A | Fan Shaft Spacers | 14 NOV 1997 |
N/A | Carburetor Modification | 30 MAY 1997 |
N/A | Door Lock Decal | 23 MAR 1994 |
N/A | Installation of Angle for Strobe Power Supply | 07 FEB 1994 |
N/A | Required Recalibration of RPM Governor and Tach | 07 JAN 1994 |
N/A | Upgrades for Fanwheel and Fanshaft | 01 NOV 1993 |
N/A | Addition of Washers on Tail Rotor Pitch Arm | 01 OCT 1993 |
N/A | Replacement of Fuel Cap Gasket | 16 JUL 1993 |