R44 Service Library - 20 Oct 2011
R44 Safety Alerts
| DATE | SUBJECT |
|---|---|
| 15 APR 09 | Hot Weather Operation |
| 07 JUN 07 | Avoid Flying Out of Trim |
| 22 MAR 07 | Main Rotor Blade Skin Debonding |
| 04 JAN 07 | Main Rotor Blade Skin Debonding |
| 20 DEC 04 | Exceeding Power Limits Can Be Fatal |
R44 Safety Notices
| NOTICE # | DATE | SUBJECT |
|---|---|---|
| SN-40 | JUL 2006 | Postcrash Fires |
| SN-40 Addendum | JUL 2006 | Suppliers of Fire-Retardant Flight Suits |
| SN-39 | JUL 2003 | Unusual Vibrations |
| SN-38 | OCT 2004 | Practice Autorotations Cause Training Accidents |
| SN-37 | DEC 2001 | Exceeding Operating Limits |
| SN-36 | NOV 2000 | Overspeeds During Liftoff |
| SN-35 | APR 1999 | Flying Near Broadcast Towers |
| SN-34 | APR 2009 | Photo Flights - Very High Risk |
| SN-33 | MAR 1998 | Vee-Belts Turning Rotor During Engine Start-Up |
| SN-32 | MAR 1998 | High Winds or Turbulence |
| SN-31 | DEC 1996 | Governor Can Mask Carb Ice |
| SN-30 | APR 2009 | Loose Objects Can Be Fatal |
| SN-29 | JUN 1994 | Airplane Pilots High Risk When Flying Helicopters |
| SN-28 | JUN 1994 | Listen For Impending Bearing Failure |
| SN-27 | JUN 1994 | Surprise Throttle Chops Can Be Deadly |
| SN-26 | JUN 1994 | Night Flight Plus Bad Weather Can Be Deadly |
| SN-25 | NOV 1999 | Carburetor Ice |
| SN-24 | JUN 1994 | Low RPM Rotor Stall Can Be Fatal |
| SN-23 | JUN 1994 | Walking Into Tail Rotor Can Be Fatal |
| SN-22 | JUN 1994 | Always Reduce Rate-of-Descent Before Reducing Airspeed |
| SN-21 | ---------------- | Deleted |
| SN-20 | JUN 1994 | Beware of Demonstration or Initial Training Flights |
| SN-19 | JUN 1994 | Flying Low Over Water is Very Hazardous |
| SN-18 | JUN 1994 | Loss of Visibility Can Be Fatal |
| SN-17 | JUN 1994 | Never Exit Helicopter With Engine Running |
| SN-16 | JUN 1994 | Power Lines Are Deadly |
| SN-15 | JUN 1994 | Fuel Exhaustion Can Be Fatal |
| SN-14 | ---------------- | Superseded by SN-17, SN-27, and SN-28 |
| SN-13 | JUN 1994 | Do Not Attach Items to the Skids |
| SN-12 | ---------------- | Superseded by SN-24 |
| SN-11 | NOV 2000 | Low-G Pushovers - Extremely Dangerous |
| SN-10 | JUN 1994 | Fatal Accidents Caused by Low RPM Rotor Stall |
| SN-9 | JUN 1994 | Many Accidents Involve Dynamic Rollover |
| SN2 - SN8 | ---------------- | Superseded or Deleted |
| SN-1 | JUN 1994 | Inadvertent Actuation of Mixture Control in Flight |
R44 Service Bulletin Index
| BULLETIN # | DATE | SUBJECT | |
|---|---|---|---|
| SB-80 | 7 SEP 2011 | Pop-out Float Cylinder Valve | R44 and R44 II helicopters with pop-out floats (Clippers), and spare pop-out float cylinders, equipped with D757-1 (gray) valve assembly containing D758-1 Revision C or prior housing assembly (Revision letter follows stamped part number). Black valves are not affected. |
| SB-79 | 20 DEC 2010 | C188-3 Sprag Clutches | R44 helicopters S/N 0001 thru 1902, and R44 II helicopters S/N 10001 thru 12323 (except 12313, 12320) |
|
SB-78 Ref. KI-196 |
20 DEC 2010 20 JAN 2011 |
Bladder Fuel Tank Retrofit | R44 helicopters S/N 0001 thru 2064, and R44 II helicopters S/N 10001 thru 12890 |
| SB-77 | 26 MAY 2010 | Clutch Actuator Fuse Holder Wiring | R44 helicopters S/N 0001 thru 2092, and R44 II helicopters S/N 10001 thru 13034 |
| SB-76 | 30 APR 2010 | Air Conditioning Installation Upgrades | R44 II helicopters S/N 10001 thru 13032 equipped with air conditioning, unless previously accomplished |
| SB-75 | 30 APR 2010 | Door Lower Hinge Pins | R44 helicopters S/N 0001 thru 0150, and all non-factory-installed R44 doors regardless of helicopter serial number |
| SB-74 | 30 APR 2010 | MRGB Input Yoke Retaining Nut Torque | R44 helicopters S/N 0001 thru 2030. R44 II helicopters S/N 10001 thru 12691, 12693 thru 12697, 12699, & 12704. Spare C006-5 or C006-6 MRGBs Revision AD and prior |
| SB-73 Ref. KI-197 |
30 APR 2010 30 APR 2010 |
Battery Relay Bypass Circuit Fuse | R44 helicopters S/N 0001 thru 0312 |
| SB-72
Ref. AD 2011-12-10 |
30 APR 2010 | Main Rotor Blade Bond Inspection | R44 helicopters with C016-2 main rotor blades, and R44 II helicopters with C016-5 main rotor blades |
| SB-71 | 25 MAR 2009 | R44 II Throttle Link | R44 II Helicopters S/N 10001 thru 12529 |
| SB-70 Ref. KI-164 |
25 MAR 2009 30 APR 2009 |
Carbon Monoxide (CO) Detector Retrofit | R44 Helicopters S/N 0001 thru 1590 |
| SB-69 Ref. KI-193-2 Ref. KI-193-1 |
25 MAR 2009 31 MAR 2009 31 MAR 2009 |
Gascolator Assembly | R44 Helicopters S/N 0001 thru 1901. R44 II Helicopters S/N 10001 thru 12222 |
| SB-68 Ref. KI-194 Ref. KI-195 |
25 MAR 2009 20 MAY 2009 20 MAY 2009 |
Rigid Fuel Line Replacement | R44 Helicopters S/N 0001 thru 2043, and R44 II Helicopters S/N 10001 thru 12723, unless previously accomplished |
| SB-67 | 06 NOV 2008 | R44 II Fuel Hose Supports | R44 II Helicopters S/N 10001 thru 12566 |
| SB-66 | 18 MAR 2008 | D202-2 Bracket Replacement | R44 Helicopters S/N 0001 thru 1879 with hydraulically boosted main rotor flight controls. R44 II Helicopters S/N 10001 thru 12242 |
| SB-65 | 22 FEB 2008 | Air Conditioning Duct Wiring | R44 II Helicopters thru S/N 12167 equipped with air conditioning. |
| SB-64 | 22 FEB 2008 | Removeable Collective Spring Pin | R44 Helicopters S/N 0001 thru 1799. R44 II Helicopters S/N 10001 thru 12010. |
| SB-63 | 22 FEB 2008 | Pedal Support Safety Tabs | R44 Helicopters S/N 0001 thru 1200 with more than 2200 hours total time in service. |
| SB-62 | 19 DEC 2007 | R44 II Throttle Linkage | R44 II Helicopters S/N 10001 thru 12029 except S/N 11792, 11951, 11996, 11999, 12007, 12008, 12018, 12023, 12025, 12027, and 12028. |
| SB-61 | 29 MAR 2007 | Main Rotor Blade Erosion | R44 Helicopters S/N 0001 thru 1670. R44 II Helicopters S/N 10001 thru 11570. |
| SB-60
|
15 SEP 2006 | C771-1 Air Filters w/ Orange Rubber | R44 Helicopters S/N 0001 thru 1640 |
| SB-59 Ref. KI-185 |
09 AUG 2006 | C046-18 Frame Tube Clamp | R44 Helicopters S/N 1160 thru 1625 except S/Ns 1161, 1165, & 1198. R44 II Helicopters S/N 10001 thru 11338 except S/N 11335 |
| SB-58A
|
01 SEP 2006 | R44 II Throttle Link | R44 II Helicopters S/N 10001 thru 11367 except S/N 11063, 11293, 11320, 11347, 1350, 11354, 11359, 1362, and 1364 |
| SB-57 | 29 MAR 2006 | KI-176 R44 Tailpipe Extension Kit | R44 and R44 II helicopters with KI-176 tailpipe extension kit installed |
| SB-56 | 29 MAR 2006 | Seat Belt Buckle Assemblies | R44s thru S/N 1576 and R44 IIs thru11107 equipped with C628-4 Rev M or prior sear belt buckle assemblies. |
| SB-55 Ref. KI-178 |
20 JUL 2005 | R44 II Fuel Control Reorientation (Supersedes SB-54) | R44 II S/Ns 10001 thru 10783 except 10673, 10709, 10720, 10721, 10750, 10766, 10768, 10733, 10774, 10766, 10777, and 10778 |
| SB-54 | 25 APR 2005 | Service Bulletin SB-54 (R44 II Fuel Control Venturi) Superseded by SB-55 | R44 II S/Ns 10001 thru 10662 except 10600, 10631, 10634,10635, 10640, 10643, 10646, 10650, 10652 thru 10656, 10659, 10660, and 10661 |
| SB-53
|
27 MAY 2004 | C046-18 Frame Tube | R44s S/N 1160 thru 1395 except 1161, 1165, & 1198 |
| SB-52
|
27 MAY 2004 | Comm Antenna Tips | R44s S/N 0001 thru 1393. R44 IIs S/N 10001 thru 10373 |
| SB-51 | 24 NOV 2003 | NAS6605-31 Bolts | R44 S/Ns 1210, 0565, 0641, 0987, & 1312 thru 1349 |
| SB-50 | 11 SEP 2003 | R44 II Oil Line Clamp | R44 II S/Ns 10001 thru 10157 except S/Ns 10033, 10092, 10140,10143, 10147, 10150, 10151, 10152, 10154, 10155, and 10156 |
| SB-49
|
11 SEP 2003 | Engine Alternate Air Intake | R44s S/N 0001 thru 1204 except 1190 and 1191 |
| SB-48 | 11 SEP 2003 | R44 II Fuel Control Safety Wire | R44 II S/Ns 10001 thru 10148. |
| SB-47
|
20 JUN 2003 | R44 II Fuel Control Inlet Fitting | R44s S/N 10001 thru 10099 except 10016, 10033, 10085, 10087, & 10092 |
| SB-46 | 15 NOV 2002 | D318-1 Muffler & Tailpipe Shield Installation | R44s S/N 0001 thru 1269 |
| SB-45 | 15 NOV 2002 | D202-2 Bracket Replacement | R44s S/N 0001 thru 1269 w/ hydraulically-boosted M.R. flight controls |
| SB-44 | 01 AUG 2001 | Hydraulic Pump Lines and Fittings | R44s S/Ns 0002 -1102 Part A R44s S/Ns 0611, 0653, 0655, 0661, 0663-0693 except 0666 and 0679 Part B |
| SB-43A Ref. AD 2003-04-05 |
10 JUN 2002 | Tail Rotor Pitch Control Bearing | See bulletin. |
| SB-43 | 01 AUG 2001 | Tail Rotor Pitch Control Bearing | All R44s |
| SB-42
CANCELLED dated 15 OCT 2004 |
01 AUG 2001 | C181-3 Lower Clutch Actuator Bearing Lubrication | All R44s |
| SB-41A | 10 JUN 2002 | Tail Rotor Rigging | R44s S/Ns 0001 thru 1225 except 1183, 1196, 1197, 1198, 1203,1204, 1209 thru 1212, and 1219 thru 1224 |
| SB-41 | 01 AUG 2001 | Tail Rotor Rigging | R44s S/Ns 0001 thru 1102 |
| SB-40 | 12 SEP 2000 | Emergency Pop-Out Float Pressure Cylinder Valve | Ships w/ emergency pop-out floats thru S/N 0848 except S/Ns 0748, 0811, 0816, 0828, 0829, & 0831 |
| SB-39
Ref. AD 2001-20-18 |
12 SEP 2000 | Horizontal to Vertical Stabilizer Attach Clips | Ships equipped w/ C044-1 horizontal stabilizers S/Ns 0009 thru 0224 except S/Ns 0018, 0090, 0094, 0111, 0129, 0144, 0161, 0178, 0201, & 0223. |
| SB-38 | 03 MAR 2000 | Hydraulic Reservoir Sequence | S/Ns 0653, 0655, 0661, 0664 thru 0696, 0698, 0699, 0701 thru 0713, 0715, 0720, and 0722 |
| SB-37 | 17 JAN 2000 | Aft C121-25 Push-Pull Contact with Mast Fairing Rib | S/Ns 0653, 0655, 0661, 0664, 0665, 0667 thru 0678, 0680, thru 0683, 0686 thru 0695, 0698, and 0709 |
| SB-36
Ref. AD 99-07-18 & AD 00-08-04 |
05 NOV 1999 | C188-3 Sprag Clutch | S/Ns 0001 thru 0541 and S/Ns 0543, 0550, 0556, & 0565 |
| SB-35
Ref. AD 99-17-17 |
26 JUL 1999 | C908-1 Yoke Replacement | S/Ns 0219 and S/N 0535 thru 0608 except S/Ns 0565, 0582, and 0592 |
| SB-34 | 21 JUN 1999 | Tail Rotor Gearbox Output Shaft Bearing Preload | S/Ns 0002 thru 0616 except 0440, 0542, 0583, 0592, 0602, 0611, and 0614 |
| SB-33 | 03 MAY 1999 | C051-1 or -2 Belt Tension Actuator | S/Ns 0001 thru 0598 & 0600 |
| SB-32
Ref. AD 99-07-18 & AD 00-08-04 |
22 MAR 1999 | C188-3 Sprag Clutch | S/Ns 0001 thru 0541 and S/Ns 0543, 0556, and 0565 |
| SB-31
Ref. AD 00-07-03 |
28 OCT 1998 | Wire Harness Contact with C726-2 Fuel Line Assembly l | S/Ns 0002 thru 0462 |
| SB-30 | 28 OCT 1998 | Auxiliary Fuel Tank Drain Tube Shutoff Clamp | S/Ns 0002 thru 0529 except 0440, 0485, 0512, 0515, 0519, 0526, 0527, and 0528 |
| SB-29
Ref. AD 99-03-05 & AD 2002-23-06 |
09 JUL 1998 | Replacement of Crankshaft Gear Retaining Bolt | S/Ns 0010, 0012, 0059, 0076, 0329, and 0331 thru 0486 |
| SB-28
Ref. AD 98-12-19 |
18 JUN 1998 | Main Rotor Blade Replacement | All R44 Helicopters equipped with C016-1 Main Rotor Blades. |
| SB-27B
Ref. AD 98-22-16 |
18 JUN 98 | Main Rotor Blade Inspection | All R44 Helicopters equipped with C016-1 Main Rotor Blades |
| SB-27A
Ref. AD 98-12-19 |
29 MAY 1998 | Main Rotor Blade Inspection | S/Ns 0002 thru 0486 equipped with C016-1 Main Rotor Blades. |
| SB-27
|
22 MAY 1998 | Main Rotor Blade Inspection | S/Ns 0002 thru 0486, C016-1 M.R. Blades S/N 0001 thru 1359 |
| SB-26
Ref. AD 98-04-12 |
01 JAN 1998 | Lateral Cyclic Trim Assembly | S/Ns 0002 thru 0420 and 0425, 0426, and 0427. |
| SB-25
Ref. AD 98-05-10 |
01 OCT 1997 | Oil Line Elbows | S/Ns 0001-0330 |
| SB-24 | 01 OCT 1997 | Removal of Paint from Tail Rotor Gearbox Attachment Surfaces | S/Ns 0001-0374 excluding 0253, 0331, 0343, 0358, 0363, and 0365 |
| SB-23
Ref. AD 97-16-02 |
30 MAY 1997 | Replacement of C018-1 Clutch Assembly | S/Ns 0001-0322 excluding 0182, 0224, 0228, 0253, 0301, 0306, 0307, 0311, 0312, 0314, and 0319 |
| SB-22 | 30 MAY 1997 | Tail Rotor Guard | S/Ns 0001-0333 excluding S/Ns 0182, 0224, 0228, 0253, 0301, and 0331. |
| SB-21
Ref. AD 97-16-02 |
18 APR 1997 | Belt Tension Actuator Switches | S/Ns 0001thru 0332 excluding S/Ns 0182, 0301, 0319, 0329, and 0331 |
| SB-20 | 16 APR 1997 | C315 Collective Support Weldment | S/Ns 0001 thru 0321 excluding S/Ns 0301, 0306, 0307, 0311, 0312, 0314, and 0319 |
| SB-19 | 16 APR 1997 | Lateral Cyclic Trim Assembly Spring Shaft Wear | S/Ns 0002 thru 0321, except 0301, 0306, 0307, 0311, 0312, 0314, and 0319 |
| SB-18 | 16 APR 1997 | Pilot's Heater Outlet Air Supply Hose | S/Ns 0001 thru 0317, except 0298, 0301, 0306, 0307, 0311, 0312, 0314, and 0315 |
| SB-17
Ref. AD 98-21-36 superseded by |
18 DEC 1996 | Pilot's Grip Assembly | S/Ns 0001 thru 0159 except 0143, 0150, & 0156. |
| SB-16 | 22 OCT 1996 | Replacement of C309-1 Panel Assy with V-Belt Restraint | S/Ns 0002 thru 0240 |
| SB-15
Ref. AD 96-18-22 |
02 AUG 1996 | Main Rotor Gearbox Ring Gear Bolts | S/Ns 0001 thru 0232 except S/N 0019, 0067, 0118, & 0215 |
| SB-14 | 26 APR 1996 | Fanshaft and Fanwheel | S/Ns 0006 thru 0246 except 0014, 0069, 0090, 0182, 0186, 0215, 0228, 0237, & 0239 |
| SB-13 | 26 DEC 1995 | Collective Spring Assembly and Spring Assembly Support Replacement | A - S/Ns 0001-0063 except 0038, 0044, 0058, & 0061.
B - S/Ns 0038, 0044, 0058, 0061, & 0064-0225 except 0211 & 0222 |
| SB-12 | 11 SEP 1995 | Cyclic Damper Replacement | S/Ns 0001-0201 |
| SB-11 | 11 SEP 1995 | Replacement of CAT Gauge and Relocation of Probe | S/Ns 0001-0201. |
| SB-10 | 11 SEP 1995 | Upper and Lower Swashplate Fork and Arm Linkage Assemblies | S/Ns 0001-0206, 0208, 0210, & 0212 |
| SB-9 | 11 SEP 1995 | Fan Nut Torque | All R44s. |
| SB-8 | 08 JUN 1995 | Gascolator Drain Valve Torque | S/Ns 0001-0183 & 0189. |
| SB-7A | 08 JUN 1995 | Low RPM Warning Unit Adjustment | S/Ns 0001-0183 & 0189. |
| SB-7 | 06 JUN 1995 | Low RPM Warning Unit Adjustment | S/Ns 0001-0214. |
| SB-6
Ref. AD 95-11-10 |
23 MAY 1995 | Placard to Prohibit Pushovers | S/Ns 0001-0206 |
| SB-5 | 26 MAY 1995 | M.R. Droop Stops and Teeter Stops | S/Ns 0001-0177 |
| SB-4
Ref. AD 95-09-07 |
24 JAN 1995 | Replacement of Guides for C121-7 Push-Pull Guides | S/Ns 0001-0150. |
| SB-3 | 18 NOV 1994 | Replacement of C007-3 Shaft Assembly and/or D174-1 Fanwheel | S/Ns 0001-0073. |
| SB-2 | 24 OCT 1994 | Inspection of Cooling Fan | S/Ns 0006-0122. |
| SB-1 | 24 MAY 1994 | Required Modification of Cyclic Trim Motors | S/Ns 0006-0070. |
R44 Service Letters with Numbers Index
| BULLETIN # | DATE | SUBJECT | AIRCRAFT AFFECTED |
|---|---|---|---|
| SL-41 | 7 SEP 2011 | Ground Handling Wheels and Wheel Supports | R44-series helicopters |
| SL-40 | 7 SEP 2011 | MRGB Oil Level Fluctuation | R44 helicopters S/N 2065 thru 2121, and R44 II helicopters S/N 12848 thru 13127 |
| SL-39 | 18 AUG 2011 | Fuel Servo Diaphragms | R44 II |
| SL-38 | 18 AUG 2011 | Cracked MS21042L-series Nuts | R44 & R44 II |
| SL-37 | 18 JUN 2010 | C016-7 Main Rotor Blades | R44 & R44 II |
| SL-36 | 17 DEC 2009 | Bladder Fuel Tank Factory Modification | R44 & R44 II |
| SL-35A | 25 MAR 2009 | Servo Plugs | R44 II helicopters equipped with RSA-10 series fuel injection servos, also known as fuel control units |
| SL-35 | 18 MAR 2008 | Servo Plugs | R44 II helicopters equipped with RSA-10 series fuel injection servos, also known as fuel control units |
| SL-34 | 22 FEB 2008 | Alternator V-Belts | All R44s |
| SL-33 | 19 DEC 2007 | Additional inspection criteria for Sprag Clutches | All R44s |
| SL-32B | 20 APR 2010 | Main Rotor Blade Bond Maintenance
Additional Information Regarding Main Rotor Blade Skin Debonding |
All R44s |
| SL-31 | 01 JUN 2006 | Main Rotor Blade Inspection | All R44s |
| SL-30 | 20 JUL 2005 | Crankshaft Replacement | R44 helicopters with engine serial nos. or crankshaft serial nos. listed in Lycoming SB No. 566 |
| SL-29 | 15 OCT 2004 | R44 & R44 II helicopters with optional four-point harnesses with detachable shoulder straps | |
| SL-28 | 15 OCT 2004 | D040-1 Aft Cowling Assembly | R44 & R44 II |
| SL-27 | 15 OCT 2004 | Tail Pipe Extension | R44 & R44 II helicopters with oblique tailpipe exit. |
| SL-26 | 24 NOV 2003 | Low RPM Warning Horn | All 28-volt R44 and R44 II S/Ns 10002 thru 10209 except 10033, 10092, 10173, 10180, 10182, 10189, 10204, and 10207 |
| SL-25 | 10 JUN 2002 | Hydraulic Reservoir Vent | S/Ns 1117 and prior equipped w/ hydraulic flight controls |
| SL-24 | 21 SEP 2001 | Main Rotor Blade Tip Inspection | |
| SL-23 | 01 AUG 2001 | Master Battery Relay Upgrade | All R44s w/ 14-volt |
| SL-22 | 10 FEB 2000 | Belt Tension Actuator Troubleshooting | |
| SL-21 | 17 JAN 2000 | Stuck Exhaust Valves in Engine | |
| SL-20 | 17 JAN 2000 | Pitot Line Contact w/Push-Pull Tube | |
| SL-19 | 16 SEP 1999 | Oil Cooler | S/Ns 0001-0628 except S/N 0237, 0331, 0431, 0440, 0562, 0592, 0611, 0619, and 0621 |
| SL-18 | 14 APR 1999 | Tachometer Contact Assembly in Magneto | S/Ns 0437-0491, & all R44s factory overhauled 2-98 thru 7-98 |
| SL-17 | 08 SEP 98 | Collective Spring and Support | S/Ns 0437-0491, & all R44s factory overhauled 2-98 thru 7-98 |
| SL-16 | 08 SEP 1998 | Master Battery Relay | S/Ns 0437-0491, & all R44s factory overhauled 2-98 thru 7-98 |
| SL-15A | 06 OCT 1998 | Mixture Control Cable Clamp | All R44s |
| SL-15 | 02 OCT 1998 | Mixture Control Cable Clamp | All R44s |
| SL-14 | 30 MAY 1997 | Carburetor Modification | S/Ns 0001-0317 excl 0182, 0224, 0228, 0298, 0301, 0307, 0311, 0314, & 0315 |
| SL-13 | 24 OCT 1996 | Lateral cyclic trim assembly spring shaft wear | S/Ns 0002 thru 0246 |
| SL-12 | 24 OCT 1996 | Upgraded battery with battery cooling | S/Ns 0002 thru 0246 |
| SL-11 | 25 OCT 1996 | Replacement of A185-2 and -5 brackets | S/Ns 0002 thru 0280, except 0007, 0118, 0224, & 0271 |
| SL-10 | 02 AUG 1996 | C439-7 Guide Assembly | All R44s |
| SL-9A | 02 MAY 1996 | Cyclic Trim System | S/Ns 0004-0190 |
| SL-09 | 26 APR 1996 | Cyclic Trim System | S/Ns 0004-0190 |
| SL-08 | 26 DEC 1995 | Cyclic Trim Elastic Cord | S/Ns 0004-0225 |
| SL-07 | 26 DEC 1995 | Cyclic Friction | S/Ns 0004-0225 |
| SL-06 | 05 MAY 1995 | Autorotation RPM Adjustment | S/Ns 0001-0144 |
| SL-05 | 04 NOV 1994 | Inspection of Push-Pull Tube Guides | All R44s |
| SL-04 | 07 SEP 1994 | Engine Breather Coupling | S/Ns 0001-0098 |
| SL-03 | 28 JUL 1994 | Cyclic "Shot Bag" Damper | S/Ns 0001-0087 |
| SL-02 | 30 JUN 1994 | Air Intake Hose Chafing Frame | S/Ns 0001-0080 |
| SL-01 | 24 MAY 1994 | Adjustment of Main Rotor Spindle Boot and Fluid Level | S/Ns 0006-0070 |
R44 Service Letters Without Numbers Index
| LETTER # | DATE | SUBJECT | AIRCRAFT AFFECTED |
|---|---|---|---|
| ------------------------ | 09 MAY 2003 | Raven II Fuel Control P/N 2576630-1 | S/Ns 10056 and 10067 thru 10073 |
| ------------------------ | 20 MAR 2003 | Governor Controller | S/Ns 10001 thru 10047 except 10016, 10033, & 10046 |
| ------------------------ | 22 JAN 2003 | PRV/Topping Valves | S/Ns 1266, 1269, 1274, & 10008 |
| ------------------------ | 19 DEC 2002 | Mixture Guard | S/Ns 10002 thru 10011, 10013 thru 10015, 10018, 10020, & 10021 |
| ------------------------ | 31 AUG 2000 | Tailcone Battery Retention Straps | S/Ns 0253, 0358, 0362, 0402, 0423, 0448, 0475, 0503, 0508, 0514, 0517, 0527, 0565, 0582, 0592, 0600, 0641, 0681, 0697, 0709, and 0714 |
| ------------------------ | 31 JUL 2000 | Pop-Out Float Covers | S/Ns 0652, 0653, 0664, 0668 |
| ------------------------ | 08 JUL 1999 | 28-Volt National Airparts Alternator Bolts | S/N 0253, 0362, 0423, 0448, 0475, 0517, and 0527 |
| ------------------------ | 11 NOV 1998 | Spindle Removal and Installation Fixture MT152-1 | |
| ------------------------ | 09 OCT 1998 | Lateral Trim Spring Assembly | S/Ns 0006, 0007, 0009, 0010, 0012, 0014, 0019, 0047, 0062, 0065, 0066, 0068, 0078, 0198, 0208, 0237, 0239, 0273, 0324, 0361, 0367, 0376, 0405, & 0413 |
| ------------------------ | 16 FEB 1998 | Swashplate Assembly | S/Ns 0427, 0432, and 0434 |
| ------------------------ | 14 NOV 1997 | Fan Shaft Spacers | S/Ns 0370, 0375 thru 0378, 0382, 0384 thru 0387, 0389, 0390, and 0391 |
| ------------------------ | 30 MAY 1997 | Carburetor Modification | S/Ns 0307, 0311, 0315, 0318, 0322, 0323, & 0324 |
| ------------------------ | 23 MAR 1994 | Door Lock Decal | S/Ns 0006, 0007, 0010-0026, 0028-0030, 0032, 0033, and 0036 |
| ------------------------ | 07 FEB 1994 | Installation of Angle for Strobe Power Supply | S/Ns 0006-0030, 0032, 0033, 0036, 0037, 0039, 0040, and 0043 |
| ------------------------ | 07 JAN 1994 | Required Recalibration of RPM Governor and Tach | S/Ns 0006, 0030, 0032, 0033, 0036, 0037, 0039, 0040, and 0043 |
| ------------------------ | 01 NOV 1993 | Upgrades for Fanwheel and Fanshaft | S/Ns 0014, 0015, 0016, and 0020 |
| ------------------------ | 01 OCT 1993 | Addition of Washers on Tail Rotor Pitch Arm | S/Ns 0014, 0015, and 0016 |
| ------------------------ | 16 JUL 1993 | Replacement of Fuel Cap Gasket | S/Ns 0005-0012 |