R22 Service Library - 20 Oct 2011
R22 Safety Alerts
| DATE | SUBJECT |
|---|---|
| 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 |
| 01 DEC 04 | Exceeding Manifold Pressure Limits |
R22 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| SN-14 | ---------------- | Superseded by SN-17, SN-27, and SN-28 |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| SN-12 | ---------------- | Superseded by SN-24 |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 |
| SN-2..SN-8 | ---------------- | Superseded or Deleted |
| SN-1 | JUN 1994 | Inadvertent Actuation of Mixture Control in Flight |
R22 Service Bulletin Index
| BULLETIN # | DATE | SUBJECT | |
|---|---|---|---|
| SB-105 | 7 SEP 2011 | Fuel Shut-Off Valve Replacement | R22-series helicopters S/N 0002 thru 4271 |
| SB-104 | 26 MAY 2010 | Clutch Actuator Fuse Holder Wiring | R22 helicopters S/N 0002 thru 4481 |
| SB-103 Ref. AD 2011-12-10 |
30 APR 2010 | Main Rotor Blade Bond Inspection | R22-series helicopters with A016-4 main rotor blades |
| SB-102 | 30 APR 2010 | Battery Relay Bypass Circuit Fuse | R22 helicopters S/N 0002 thru 2654 |
| SB-101 | 30 APR 2010 | Door Lower Hinge Pins | R22, R22 Alpha, R22 Beta, & R22 Mariner helicopters S/N 0002 thru 2514, and all non-factory-installed R22 doors |
| SB-100 | 30 APR 2010 | Carbon Monoxide (CO) Detector Retrofit | R22 helicopters S/N 0001 thru 4037 equipped with optional cabin heaters |
| SB-99 | 30 APR 2010 | Gascolator Assembly | R22 helicopters S/N 0002 thru 4339 |
| SB-98 | 22 FEB 2008 | Removable Collective Spring Pin | R22s S/N 0002 thru 4231 with removable controls |
| SB-97 | 22 FEB 2008 | Pedal Support Safety Tabs | R22s S/N 0002 thru 3325 with more than 2200 hours total time in service |
| SB-96 | 29 MAR 2007 | Main Rotor Blade Erosion | R22s S/N 0002 thru 4100 |
| SB-95 | 26 JAN 2005 | A181-4 Lower Actuator Bearing Assembly | S/Ns 4563 thru 4981, 4995, 5002, 5003, 5010, and 5017 |
| SB-94 | 14 DEC 2004 | A016-2 Main Rotor Blade Replacement | All R22 Helicopters equipped with A016-2 Main Rotor Blades |
| SB-93 | 27 MAY 2004 | Comm Antenna Tips | R22s S/N 0002 thru 3613 |
| SB-92 | 03 NOV 2003 | Tail Rotor Pedal Retaining Clips | R22s equipped w/ removable pedals originally installed on R22s thru S/N 2373 |
| SB-91 | 03 NOV 2003 | A437-2 Jackshaft Brace Tabs | R22s S/N 0002 thru S/N 3465 except S/Ns 0256, 1087, 1112, 1226, 1475, 1493, 1918, 2051,2219, 2452, 2890, 3087, 3160, 3167, 3299, & 3460 |
| SB-90A Ref. AD 2003-04-04 |
10 JUN 2002 | Tail Rotor Pitch Control Bearings | See bulletin |
| SB-89 | 01 AUG 2001 | A184 Upper Clutch Actuator Bearing Lubrication | All R22s |
| SB-88A
Ref. AD 2000-20-51 |
13 SEP 2000 | A203-5 Yoke Replacement | Supersedes SB-88 dated 12 Sep 00 |
| SB-88 | 12 SEP 2000 | A203-5 Yoke Replacement | S/Ns 0002 thru 2787 |
| SB-87 | 15 DEC 1999 | Seat Belt Anchor Upgrade | S/Ns 0002 thru 1979 unless factory overhauled Nov 1991 or later |
| SB-86 | 03 MAY 1999 | A121-3 and A121-7 Push-Pull Tubes rubbing | S/Ns 2858 thru 2948 |
| SB-85
Ref. AD 99-07-17 & AD 2000-08-09 |
22 Mar 99 | A188-2 Sprag Clutch | S/Ns 0002 thru 2862 |
| SB-84 Ref. AD 98-21-09 |
09 SEP 1998 | Fuel Tank Vent Upgrade | S/Ns 0002-1451 unless factory overhauled 1-91 or later |
| SB-83 Ref. AD 98-21-09 |
04 MAR 1997 | Upgrade of Fuel Tank Vents | All R22 helicopters manufactured prior to 1991 |
| SB-82
Ref. AD 97-25-05 |
03 MAR 1997 | Carburetor Replacement | S/Ns 2571 thru 2664 |
| SB-81 | 08 JUN 1995 | Gascolator Drain Valve Torque | S/Ns 0002 thru 2537 |
| SB-80A
Ref. AD 97-02-14 |
08 JUN 1995 | Throttle Governor Installation and Low RPM Warning Unit Adjustment | A: S/Ns 0002-2537. B: S/Ns 0002-1759 |
| SB-80 | 06 JUN 1995 | Throttle Governor Installation and Low RPM Warning Unit Adjustment | A: S/Ns 0002-2554.
B: S/Ns 0002-1759 unless already equipped with governor |
| SB-79
Ref. AD 95-11-09 |
23 MAY 1995 | Placard to Prohibit Pushovers | S/Ns 0002-2547 |
| SB-78A | 27 MAY 2004
revised |
Main Rotor Droop Stops and Teeting Stops | S/Ns 0002-2519 |
| SB-78 | 26 MAY 1995 | Main Rotor Droop Stops and Teeting Stops | S/Ns 0002-2519 |
| SB-77
Ref. AD 96-09-29 |
25 APR 95 | Replacement of Vee Belt Upper Sheave | S/Ns 1441-2096 |
| SB-76
Ref. AD 95-06-07 |
22 DEC 1994 | Main Rotor Shaft Retaining Nuts | S/Ns 0002-2177 |
| SB-75
Ref. AD 95-06-07 |
22 NOV 1994 | Replacement of Fwd Flex Plates | All R22s |
| SB-74
Ref. AD 95-23-05 |
18 JUL 1994 | Tail Rotor Gearbox Output Shaft Key | S/Ns 0002-2180 |
| SB-73
Ref. AD 95-06-07 |
15 MAR 1994 | Inspection of A947-1 Fwd Flex Plate | All R22s |
| SB-72
Ref. AD 94-15-08 |
29 Mar 93 | Inspection of Main Rotor Blades for Corrosion | All R22s with A016-2 thru S/N 7569 |
| SB-71 | 18 JUN 1992 | Inspection of Upper Vee Belt Sheave | S/Ns 1447-2096 |
| SB-70A | 3 JUN 1992 | Improved Replacement Vee Belts | S/Ns 0002-1976 and S/Ns 1996-2145 |
| SB-70 | 3 JUN 1992 | Improved Replacement of Vee Belts | S/Ns 0002-1976 and S/Ns 1996-2145 |
| SB-69
Ref. AD 92-06-17 |
27 FEB 1992 | Replacement of Suspect NAS1304-16AF Bolts | S/Ns 1880-2060 & 2073 |
| SB-68 | 27 FEB 1992 | Tailcone Skin Doubler for all Tail Rotor Visual | S/Ns 0002-2060 |
| SB-67 | 09 JAN 1992 | Replacement of Tail Rotor Visual Warning Guard (B312-11) | S/Ns 0002-2040 |
| SB-66 | 19 APR 1991 | Vee Belt - Lower Sheave Inspection | S/Ns 0002-1170 |
| SB-65 | 20 DEC 1990 | Cracking of Fanwheel Assembly Hubs | S/Ns 1000-1330 |
| SB-64 | 08 JUN 1990 | Tail Rotor Clip Replacement with SB-64 Kit (A795-1 Rev and subsequent) | S/Ns 0002-1432 |
| SB-63 | 06 JUN 1990 | Replacement of Fan Shaft Bearings with A181-4 | All R22s |
| SB-62 | 10 MAY 1990 | Air Duct Chafing Oil Line | S/Ns 0002-1392 |
| SB-61
Ref. AD 90-17-01 |
28 JUL 1989 | Latches on Carburetor Air Box | S/Ns 0885-0948 & 0184, 0292, 0403, 0436, 0374, 0603, 0567, 0394, 0617, 0378, 0592, 0473, 0601, 0771, and R22s equipped with latches in place of bolts on carburetor air box cover |
| SB-60A
Ref. AD 88-26-01 |
12 JAN 1989 | Main Rotor Spindle Rework and Journal Replacement | S/Ns 0002-0912 equipped with with A158-1 spindle Rev Q or prior |
| SB-59 | 07 NOV 1988 | Main Rotor Spindle Crack Inspection | All R22s with over 500 hrs time in service |
| SB-58 | 13 SEP 1988 | Actuator Bearing | S/Ns 0002-0830 |
| SB-57
Ref. AD 87-18-03 |
11 MAY 1987 | Main Rotor Pitch Link Inspection and Fitting Replacement | S/Ns 0580-0644 and R22s O/H repaired at RHC 15 Aug 86 thru 7 May 87 and all A258-1,-2, -4s received from RHC 15 Aug 86 thru 7 May 87 |
| SB-56 | 20 JAN 1987 | Stop for Cabin Door Air Vent | S/Ns 0002-0622 |
| SB-55 | 07 JAN 1987 | R22 Harness Assembly Buckle | S/Ns 0436-0603 and having new A628 installed 20 Aug 84 thru 1 Jan 87 |
| SB-54 | 20 NOV 1986 | Caution Decal for Carburetor Air Temperature Gauge | S/Ns 0002-0602, 0604 and 0610 |
| SB-53 | 01 OCT 1986 | Cracks in Lower Vertical Fin Attachment Channels | S/Ns 0002-0598 |
| SB-52 | 02 JUL 1986 | Oil Cooler Mounting Installation | S/Ns 0002-0557 |
| SB-51 | 02 JUL 1986 | Main Rotor Elastic Teeter Stops | S/Ns 0501-0554 having teeter stops installed with Ty-Raps |
| SB-50 | 15 APR 1986 | Vee Belt Drive | S/Ns 0002-0529 without new double banded A190-2 v-belts |
| SB-49 | 15 APR 1986 | A740-1 Manifold Pressure Line | S/Ns 0002-0545 |
| SB-48 | 13 JAN 1986 | A723 Oil Cooler Lines | S/Ns 0002-0500 without sleeves |
| SB-47 | 13 JAN 1986 | Inspection of A020-2 Upper Frame | S/Ns 0002-0311 except those with A020-2 S/Ns 0400 and on |
| SB-46 | 18 OCT 1985 | Sprag Clutch Replacement | A/C affected by SB-42A without new A188-2 installed |
| SB-45 | 10 MAY 1985 | Clutch Actuator Overtravel | S/Ns 0002-0463 |
| SB-44
CANCELLED (09-12-00) |
05 FEB 85 | Inspection of Lower Actuator Bearing | All R22s |
| SB-43
Ref. AD 84-18-04 |
24 AUG 1984 | Inspection and Modification of Main Rotor Gearbox Ring Gear Bolts | S/Ns 0002-0433 equipped with A006 S/Ns 0002-0434 |
| SB-42A | 18 MAR 1985 | Drive System Growl | S/Ns 0345-0433 and A/C with clutch sprag replaced May 83-Jul 84 |
| SB-41 | 20 JUN 1984 | Mixture Control Safety Spring Assembly Installation | S/Ns 0002-0265 |
| SB-40 | 20 JUN 1984 | Modification of Fwd. RH Landing Gear Mount Shackle | S/Ns 0301 and 0350-0374 |
| SB-39 | 17 FEB 1984 | Drilled Head Bolt Installation Lower Frame to Fuselage | S/Ns 0002-0383 |
| SB-38 | 17 FEB 1984 | M.R. Controls Sticking or Binding | S/Ns 0002-0393 |
| SB-37A | 06 MAR 1984 | Washer installed on M.R. Pitch Rod | S/Ns 0002-0333 |
| SB-36 | 11 NOV 1983 | Inspection of A121-7 Push-Pull Tube and Guide Wear | S/Ns 0002-0369 |
| SB-35 | 07 OCT 1983 | V-Belt Installation | S/Ns 0002-0379 equipped with A020-2 S/Ns 0002-0500 |
| SB-34 | 24 AUG 1983 | Clutch Actuator Light Relocation | S/Ns 0002-0349 |
| SB-33 | 25 JUL 1983 | Mandatory Replacement of Old Design Rev W (1000 hr) Main Rotor Blades | Equipped with Rev W blades S/Ns 0810 or prior |
| SB-32 | 07 JUN 1983 | Actuator Drive Screw | Equipped with A051-1 S/Ns 0152-0346 |
| SB-31 | 14 APR 1983 | Lower Actuator Bearing A181-1 | S/Ns 0196-0341 and rebuilt, O/H, or repaired A/C with new A181 installed Aug 81 thru 14 Apr 83. |
| SB-30 | 12 APR 1983 | Check if Low RPM Warning System | S/Ns 0002-0332 |
| SB-29 | 01 MAR 1983 | Clutch Lock Switch | S/Ns 0002-0225 |
| SB-28 | 22 FEB 1983 | Inspection of Lower Actuator Bearing A181-1 | S/Ns 0002-0380 |
| SB-27 | 02 FEB 1983 | Spring for Cyclic Boot | S/Ns 0002-0320 |
| SB-26 | 09 NOV 1982 | Installation of A960-1 Clamp and A961-1 Strap on A020-2 Upper Frame | S/Ns 0002-0311 except those equipped with A020-2 S/Ns 0400 and on |
| SB-25
Ref. AD 97-02-14 |
26 OCT 1982 | Low RPM Warning Unit Readjustment | S/Ns 0002-0307 |
| SB-24
Ref. AD 97-02-14 |
23 OCT 1982 | Low RPM Warning Light Installation | S/Ns 0002-0250 |
| SB-23 | 27 AUG 1982 | Inspection of A020-2 Upper Frame | S/Ns 0002-0311 equipped with A020-2 S/Ns 0002-0361 |
| SB-22 | 24 JUN 1982 | Inspection for Rubbing A121-7 Push-Pull Tubes | S/Ns 0002-0286 |
| SB-21 | 01 JUN 1982 | Replacement of Tail Rotor Drive Shaft and Aft Flex Plate | S/Ns 0002-0286 |
| SB-20 | 03 MAY 1982 | Inspection of Long Tail Rotor Drive Shaft and Damper | S/Ns 0002-0290 |
| SB-19 | 13 APR 1982 | Replacement of A106-4 or -5 Journals and Teeter Hinge Bearings | S/Ns 0052, 0125, 0198, 0244-0267 |
| SB-18 | 12 MAR 1982 | Inspection of A020-2 | S/Ns 0002-0260 equipped with A020-2 S/Ns 0002-0287 |
| SB-17 | 15 MAR 1982 | Replacement of Fuel Valve Handle | S/Ns 0002-0255 |
| SB-16 | 18 NOV 1981 | Improper Clutch Shaft Plug Installation | S/Ns 0002-0226 |
| SB-15 | 14 NOV 1981 | Service Life Reduction and Additional Inspection of A016 Main Rotor Blades | All R22s |
| SB-14 | 14 OCT 1981 | Failure of the A041-2 Damper Clip | S/Ns 0002-0220 |
| SB-13 | 04 SEP 1981 | MR Root Fitting Fatigue Failure | All R22s |
| SB-12 | 26 MAY 1981 | Removal of Sharp Edges on the Angular Latch of A628-1 & -2 | S/Ns 0002-0153 |
| SB-11 | 04 MAY 1981 | Inspection of A192 and A194 Main Rotor Gearbox Yokes | S/Ns 0002-0107 |
| SB-10
CANCELLED (09-12-00) |
27 APR 1981 | Inspection of A184-1 (Upper) and A181-1 (Lower) Sheave Bearing | S/N 0002 and after |
| SB-9 | 04 MAR 1981 | Additional Inspection of Main Rotor Gearbox Yokes | S/Ns 0002-0036, 0038-0061, 0064-0089, 093 and 0095. |
| SB-8 | 19 FEB 1981 | Ice Blockage of Engine Breather Tube | S/Ns 0002-0100 |
| SB-7 | 09 FEB 1981 | Inspection of Long TR Drive Shaft | S/Ns 0002-0099 |
| SB-6 | 26 JAN 1981 | Inspection of Main Rotor Gearbox Flex Coupling Yoke | S/Ns 0002-0095 |
| SB-5 | 06 OCT 1980 | Possible Installation of Defective Main Rotor Gear Sets | S/Ns 0006-0060 |
| SB-4 | 28 OCT 1980 | Inspection of Frame A020-2 | S/Ns 0002-0082 |
| SB-3 | 29 JUL 1980 | Steel Tube Frame A020-2 | S/Ns 0002-0045 |
| SB-2 | 04 MAR 1980 | Main Rotor Blade Inspection | S/Ns 0002-0020 equipped with M.R. Blades S/Ns 0003-0043 |
| SB-1 | 28 DEC 1979 | Main Rotor Blade Inspection | S/Ns 0002-0014 equipped with M.R. Blades S/Ns 0003-0033 |
R22 Service Letters with Numbers Index
| BULLETIN # | DATE | SUBJECT | AIRCRAFT AFFECTED |
|---|---|---|---|
| SL-59 | 7 SEP 2011 | MRGB Oil Level Fluctuation | R22 helicopters S/N 4442 thru 4509 |
| SL-58 | 18 AUG 2011 | Cracked MS21042L-series Nuts | All R22s |
| SL-57 | 22 FEB 2008 | Alternator V-Belts | All R22s |
| SL-56B | 30 APR 2010 | Main Rotor Blade Bond Maintenance Additional Information Regarding Main Rotor Blade Skin Debonding | All R22s |
| SL-56 | 01 JAN 2006 04 JAN 2007 |
Main Rotor Blade Inspection | All R22s |
| SL-54 | 25 MAR 2004 Revised 31 MAR 2004 Revised 17 JUN 2004 |
Revised Main Rotor Blade Retirement Life | All R22s |
| SL-53 | 21 NOV 2001 | Visual Inspection of Main Rotor Blade Root Area | All R22s |
| SL-52 | 01 AUG 2001 Supersedes SL-49 |
Master Battery Relay Upgrade | All R22s |
| SL-51 | 14 APR 1999 | Tachometer Contact Assy in Magneto | |
| SL-50 | 02 OCT 1998 | Mixture Control Cable Clamp | All R22s |
| SL-49 | 08 SEP 1998 | Master Battery Relay | S/Ns 2786, 2793, & 2797-2847, & all R22s factory overhauled 2-98 thru 7-98 |
| SL-48 | 04 MAR 1997 | A184 Upper Clutch Actuator Bearing | All R22s |
| SL-47 | 10 APR 1996 | "Governor Off" Caution Light | R22s without light |
| SL-46 | 23 SEP 1994 | M.R. and T.R.G.B. Chip Detectors | All R22s |
| SL-45 | 23 SEP 1994 | T.R.G.B. Shaft - Keys Terminating Action for AD 94-17-07 | Reference AD 94-17-07 and SB-74 |
| SL-44 | 20 OCT 1992 | Replacement of Fuel Shut-Off Guard | S/Ns 0002-2230 |
| SL-43 | 08 OCT 1992 | Additional Caution Decal for Baggage Compartments | S/Ns 0002-2320 |
| SL-42 | 18 JUN 1992 | Replacement of Inlet Ducts | S/Ns 0002-2151 |
| SL-41 | 13 MAR 1992 | False Low RPM Warning Occurring During Radio Transmissions | S/Ns 0002-2059 |
| SL-40 | 28 AUG 1991 | Tail Rotor Visual Guard | S/Ns 0002-1889 |
| SL-39 | 19 APR 1991 | V-Belt Installation | S/Ns 0002-1770 |
| SL-38 | 22 MAR 1991 | Tail Rotor Paint Scheme | All R22s |
| SL-37 | NOV 1990 | Carburetors Service Bulletins | All R22s |
| SL-36 | 05 OCT 1990 | Alignment of Fan Shaft Bearing Housing | All R22s |
| SL-35 | 06 JUN 1990 | Alignment of V-Belt Sheaves | All R22s |
| SL-34 | 15 SEP 1989 | Excessive Oil Leakage from Tail Rotor Gearbox Breather Tube | All R22s |
| SL-33 | 18 MAY 1989 | Aeroquip Corp. Bulletin No. 0001 | S/Ns 0002-0820 |
| SL-32 | 07 NOV 1988 | Overrunning of Sprag Clutch | Any R22 and especially those with A018 clutches manufactured or overhauled 1 FEB 88 thru 31 OCT 88 |
| SL-31 | 12 APR 1988 | A184-1 Clutch Bearing | All R22s |
| SL-30 | 16 NOV 1987 | Magneto Switch Wiring | S/Ns 0002-0726 except S/Ns 0002-0077 with impulse coupling installed |
| SL-29 | 14 SEP 1987 | Proper Use of Starter Switch to Avoid Breaking Starter | All R22s |
| SL-28 | 17 DEC 1986 | Avco Lycoming Service Bulletin No. 477 | S/Ns 0525-0602, 0604, 0608,0610, 0002, 0014, 0023, 0033, 0037, 0054, 0056, 0110, 0140, 0164, 0184, 0190, 0214, 0229, 0237, 0268, 0274, 0285, 0289, 0325, 0330, 0343, 0376, 0398, 0423, and 0439 |
| SL-27 | 01 OCT 1986 | New A190-2 Banded V-Belt Installation | Whenever installing A190-2 banded v-belts |
| SL-26 | 15 APR 1986 | Battery Terminal Misalignment | S/Ns 0002-0545 |
| SL-25 | 01 JAN 1985 | Modification of A437 Jackshaft Brace Tab | S/Ns 0002-0435 |
| SL-24 | 06 NOV 1984 | Removal of Clutch Yokes Before Shipment | All R22s |
| SL-23A | 20 JUN 1984 | Special Caution When Installing V-Belts or Other Driveline Components | All R22s |
| SL-22 | 17 FEB 1984 | Replacement Bearings for Tail Rotor Teeter Hinge and Severe Hazard When Using Any Non-Approved Bearings | All R22s |
| SL-21A | 31 MAY 2002 | Main Rotor Blade Sealant and Filler Cracking | R22s with P/N A016-2 |
| SL-21 | 17 FEB 1984 | Checks or Cracks in Main Rotor Blade Sealant and Filler | All R22s |
| SL-20A | 20 JUN 1984 | Vee Belt Installation | All R22s |
| SL-19 | 07 JUN 1982 | Installation of Guard for Removable Cyclic Stick | All R22s equipped with optional removable cyclic control |
| SL-18 | 07 JUN 1982 | Installation of Mixture Control | All R22s |
| SL-17 | 17 MAY 1982 | Removal of Cabin Heater Muffler Shroud in Warm Weather to Extend Muffler Service Life | All R22s equipped with cabin heater systems |
| SL-16 | 19 MAY 1982 | Installation of A911-1 Cabin Heater Scoop | S/Ns 0002-0187 equipped with cabin heater systems |
| SL-15 | 23 SEP 1981 | Visual Inspection of Main Rotor Blade Root Area | M.R. Blades A016 S/Ns 0100-0593 Rev. A-V |
| SL-14 | 16 SEP 1981 | Inspection of A197 T.R. Drive Shafts | All R22s |
| SL-13 | 10 SEP 1981 | Loose Horizontal Firewall to Steel Tube Frame Attach Bolts | S/Ns 0002-0150, 0152-0182, 0184-0188, 0190-0195, 0198 |
| SL-12 | 19 AUG 1981 | Premature Wear of A190-1 V-Belts | S/Ns 0002-0167 |
| SL-11 | 18 AUG 1981 | Loose Upper Cylinder Base Nuts | S/Ns 0045-0160 |
| SL-10 | 11 AUG 1981 | Engine Idle Speed Limitations | S/Ns 0002-0232 |
| SL-9 | 27 JUL 1981 | Installation of A214-3 Safety Washers | S/Ns 0002-0161, 0167. 0169-0172 |
| SL-8 | 03 OCT 1980 | Action Required When Main Rotor Chip Light Comes On | All R22s |
| SL-7 | 27 SEP 1980 | Inspection of Long T.R. Drive Shaft | S/Ns 0002-0058 |
| SL-6 | 24 SEP 1980 | Inspection of A193-2 Flex Plate | S/Ns 0002-0058 |
| SL-5 | 29 OCT 1980 | Installation of Nickel Plated Washers in the Fwd and Intermediate Flex Plates | S/Ns 0002-0041 |
| SL-4 | 22 JUL 1980 | Battery Ground Strap | S/Ns 0002, 0006-0016, 0018-0020, 0022-0032 |
| SL-3 | 22 JUL 1980 | T.R. Control Pedals | S/Ns 0003-0008 |
| SL-2 | 22 JUL 1980 | T.R. Control Push-Pull Tube A121-13 | S/Ns 0025-0027 |
| SL-1 | 22 JUL 1980 | Cabin Heat Blower Assembly A643 | S/Ns 0006-0022 |
R22 Service Letters Without Numbers Index
| LETTER # | DATE | SUBJECT | AIRCRAFT AFFECTED |
|---|---|---|---|
| ------------------------ | 11 JAN 2002 | Modification of S723-1 Oil Filter Adapter to Facilitate Oil Filter Removal | R22 Helicopters S/N 3277, 3278, 3285, 3286, and 3289 |
| ------------------------ | 12 SEP 2000 | SB-10 dated 27 April 1981 and SB-44 dated 05 February 2985 | CANCELLED |
| ------------------------ | 12 MAY 1997 | Elastomeric Tail Rotor Teeter Hinge Bearings | R22 Helicopters S/N 2452 and 2634 thru 2642 |
| ------------------------ | 22 JUL 1992 | Carburetor Floats | R22s repaired or O/H at RHC between 01 Dec 1991 and 22 Jul 1992 |
| ------------------------ | 03 JUN 1992 | Replacement of Low RPM Circuit | S/Ns 2115-2148 |
| ------------------------ | 22 OCT 1990 | Installation of New Governor Toggle Switch | R22 Governors with push-button and light |
| ------------------------ | 10 OCT 1988 | Latches on Carb Air Box Cover | S/Ns 0885-0887, 0890, 0184, 0292, 0403, 0436 if equipped with spring latches on carb air box covers |
| ------------------------ | 15 JAN 1988 | Carburetor Air Inlet Duct | Mariner R22s |
| ------------------------ | 07 JUL 1987 | Float Gear Installation and Removal | Mariner R22s |
| ------------------------ | 06 DEC 1986 | Modification of MAP Limit Charts A654-64 Decal for Beta Model | Beta and Mariner S/Ns 0501-0604 |
| ------------------------ | 22 MAY 1985 | Modification of A752-2 Headset | S/Ns 0457-0473 except 0468, 0035, 0100, 0120, 0167, 0176, 0230, 0269, 0275, 0355, 0371 |
R22 Kit Instructions
| NAME | SUBJECT | |
|---|---|---|
| KI-61 | R22 Landing Light Relay Conversion Kit | 15 SEP 2011 |
| KI-164 | R22 & R44 Carbon Monoxide Detector Field Installation Kit | 30 APR 2009 |
| KI-179-3 | R22-series KANNAD 406 AF-Compact ELT Field Installation Kit | 17 OCT 2011 |
| KI-193-4 | R22 Gascolator Assembly Upgrade Kit Instructions | 30 APR 2010 |
| KI-197 | R22 & R44 Battery Relay Bypass Circuit Kit Instructions | 30 APR 2010 |
| KI-205 | Ground Handling Cart Booster Cable Kit Instructions | 01 NOV 2011 |