R44 Service Letters

NUMBER SUBJECT DATE
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-37 C016-7 Main Rotor Blades 18 JUN 2010
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Superseded by R44 SB-79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, C016-4, 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
R444 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Superseded by R44 SB-72A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 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Superseded by R44 SL-23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Superseded by R44 SL-10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
R44SL-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 Special 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