R66 Service Letters

NumberSubjectDate
R66 SL-45C
Supersedes SL-45B
Symmetrical Horizontal Stabilizer Retrofit Kit18 MAR 2024
R66 SL-44Cockpit Camera Firmware (Software) Update23 JUN 2023
R66 SL-43Tail Rotor Static Balance Equivalent Tool16 MAR 2023
R66 SL-42Rolls-Royce RR300 Engine 2000-hour Preventative Maintenance Interval (PMI) Options30 JUN 2021
R66 SL-41
Supersedes R66 SL-34 & SL-34A
Erratic N1 Indication/EMU Recordings30 JUN 2021
R66 SL-40A
Supersedes R66 SL-40
Tail Rotor Blade Condition and Care03 JUN 2022
R66 SL-39ELT Security30 JUN 2021
R66 SL-38A462-4 Fitting Attachments30 JUN 2021
R66 SL-37Main Rotor Blade Unpainted Leading Edge Care13 NOV 2020
R66 SL-36Firewall Drain Tube21 AUG 2020
R66 SL-35B
Supersedes R66 SL-35A
RHC Instructions for Continued Airworthiness (ICA) Digital Updates24 MAR 2023
R66 SL-34A
Superseded by R66 SL-41
Engine Harness N1 Connector21 AUG 2020
R66 SL-33Inspection After Stabilizer Damage11 MAR 2020
R66 SL-32Kannad ELT Service Bulletin11 MAR 2020
R66 SL-31RR300 Engine Corrosion Prevention02 DEC 2019
R66 SL-30Main Rotor Blade Tip Maintenance29 JUL 2019
R66 SL-29C627-6 Five-point Harness Assembly Lower Strap22 MAR 2019
R66 SL-28Main Rotor Gearbox Internal Visual Inspection05 NOV 2018
R66 SL-27Lithium-Ion Battery Transient Voltage Drop05 NOV 2018
R66 SL-26B
Superseded by R66 SB-36
Main Rotor Blade Tip Plate Permanent Removal29 JUL 2019
R66 SL-25C
Supersedes R66 SL-25B
Component Maintenance Course04 DEC 2023
R66 SL-24F642 Shaft (Engine-to-Main Gearbox) Upgrade20 DEC 2017
R66 SL-23A
Supersedes R66 SL-23
Fire Extinguisher Handling and Maintenance20 DEC 2017
R66 SL-22R66 Marine Skid Extension Kit21 JUL 2017
R66 SL-21Revised Instrument Marking Metric Decals06 JUN 2017
R66 SL-20C258-5 Pitch Link Assembly30 JAN 2017
R66 SL-19A
Supersedes R66 SL-19
Avionics Software20 DEC 2017
R66 SL-18PTG Beep Rigging07 NOV 2016
R66 SL-17Genesys Aerosystems (Autopilot) Service Letter07 NOV 2016
R66 SL-16Garmin G500H EFIS Air Temperature Probe Relocation07 NOV 2016
R66 SL-15Main Rotor Blade Tip Fasteners07 NOV 2016
R66 SL-14
Supersedes R66 SB-20A
Heater Line Spirap Insulation14 JUN 2016
R66 SL-13Inhibited Glideslope Reception14 JUN 2016
R66 SL-12Altimeters04 APR 2016
R66 SL-11Main Gearbox Upgrade
Ref. Addendum for R66 Service Letter SL-11
15 SEP 2015
R66 SL-10A
Supersedes R66 SL-10
B526 (TORX Plus®) Truss Head Screws07 NOV 2016
R66 SL-09D210 Corrosion-Resistant (CRES) Nuts13 OCT 2014
R66 SL-08EASA Registration Requirements09 MAY 2014
R66 SL-07Deleted Safety Wire03 JUL 2013
R66 SL-06Damper Assembly
21 DEC 2012
R66 SL-05Kannad ELT Service Bulletin
Ref. Kannad ELT Service Bulletin S1820514-25-04
19 JUL 2012
R66 SL-04Center Rear Seat Decal29 MAY 2012
R66 SL-03A
Superseded by R66 SB-05B
Clutch Assembly Retaining Bolt Replacement30 SEP 2011
R66 SL-02Baggage Door Seals Kit07 SEP 2011
R66 SL-01Cracked MS21042L-series Nuts18 AUG 2011