R22 SERVICE LETTER/SERVICE BULLETIN (WITHOUT NUMBER) INDEX

DATE

SUBJECT

A/C AFFECTED

22 May 85

Modification of A752-2 Headset

S/Ns 0457-0473 except 0468, 0035, 0053, 0100, 0120, 0167, 0176, 0230, 0269, 0275, 0355, 0371

6 Dec 86

Modification of MAP Limit Charts A654-64 Decal for Beta model

Beta and Mariner S/Ns 0501-0604

7 Jul 87

Float Gear Installation and Removal

Mariner R22s

15 Jan 88

Carburetor Air Inlet Duct

Mariner R22s

10 Oct 88

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

22 Oct 90

Installation of New Governor Toggle Switch

R22 Governors with push-button and light

3 Jun 92

Replacement of Low RPM Circuit

S/Ns 2115-2148

22 Jul 92

Carburetor Floats

R22s repaired or O/H at RHC between 1 Dec 91 and 22 Jul 92

12 May 97

Elastomeric Tail Rotor Teeter Hinge Bearings

R22 Helicopters S/N 2452 and 2634 thru 2642

12 Sep 00

SB-10 dated April 27, 1981and SB-44 dated 5 February 1985

CANCELLED

11 Jan 02

Modification of D723-1 Oil Filter Adapter to facilitate oil filter removal

R22 Helicopters S/N 3277, 3278, 3285, 3286, & 3289

R22 SERVICE LETTER (WITH NUMBER) INDEX

NO.

DATE

SUBJECT

A/C AFFECTED

SL-1

22 Jul 80

Cabin Heat Blower Assembly A643

S/Ns 0006-0022

SL-2

22 Jul 80

T.R. Control Push-Pull Tube A121-13

S/Ns 0025-0027

SL-3

22 Jul 80

T.R. Control Pedals

S/Ns 0003-0008

SL-4

22 Jul 80

Battery Ground Strap

S/Ns 0002, 0006-0016, 0018-0020, 0022-0032

SL-5

29 Oct 80

Installation of Nickel Plated Washers in the Fwd and Intermediate Flex Plates

S/Ns 0002-0041

SL-6

24 Sep 80

Inspection of A193-2 Flex Plate

S/Ns 0002-0058

SL-7

27 Sep 80

Inspection of Long T.R. Drive Shaft

S/Ns 0002-0058

SL-8

3 Oct 80

Action required when Main Rotor Chip Light comes on

All R22s

SL-9

27 Jul 81

Installation of A214-3 Safety Washers

S/Ns 0002-0161, 0167, 0169-0172

SL-10

11 Aug 81

Engine Idle Speed Limitations

S/Ns 0002-0232

SL-11

18 Aug 81

Loose Upper Cylinder Base Nuts

S/Ns 0045-0160

SL-12

19 Aug 81

Premature Wear of A190-1 V-Belts

S/Ns 0002-0167

SL-13

10 Sep 81

Loose Horizontal Firewall to Steel Tube Frame Attach Bolts

S/Ns 0002-0150, 0152-0182, 0184-0188, 0190-0195, 0198

SL-14

16 Sep 81

Inspection of A197 T.R. Drive Shafts

All R22s

SL-15

23 Sep 81

Visual inspection of Main Rotor Blade Root Area

M.R. Blades A016 S/Ns 0100-0593 Rev. A-V

SL-16

19 May 82

Installation of A911-1 Cabin Heater Scoop

S/Ns 0002-0187 equipped with cabin heater systems

SL-17

17 May 82

Removal of Cabin Heater Muffler Shroud in warm weather to extend muffler service life

All R22s equipped with cabin heater systems

SL-18

7 Jun 82

Installation of Mixture Control

All R22s

SL-19

7 Jun 82

Installation of Guard for Removable Cyclic Stick

All R22s equipped with optional removable cyclic control

SL-20A

20 Jun 84

Vee Belt Installation

All R22s

SL-21

17 Feb 84

Checks or Cracks in Main Rotor Blade Sealant and Filler

All R22s

SL-21A

31 May 02

Main Rotor blade sealant and filler cracking

R22s with P/N A016-2

SL-22

17 Feb 84

Replacement Bearings for Tail Rotor Teeter Hinge and Severe Hazard when using any Non-Approved Bearings

All R22s

SL-23A

20 Jun 84

Special Caution when installing V-Belts or other Driveline Components

All R22s

SL-24

6 Nov 84

Removal of Clutch Yokes before shipment

All R22s

SL-25

1 Jan 85

Modification of A437 Jackshaft Brace Tab

S/Ns 0002-0435

SL-26

15 Apr 86

Battery Terminal Misalignment

S/Ns 0002-0545

SL-27

1 Oct 86

New A190-2 Banded V-Belt Installation

Whenever installing A190-2 banded v-belts

SL-28

17 Dec 86

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, & 0439

SL-29

14 Sep 87

Proper use of Starter Switch to avoid breaking starter

All R22s

SL-30

16 Nov 87

Magneto Switch Wiring

S/Ns 0002-0726 except S/Ns 0002-0077 with impulse coupling installed

SL-31

12 Apr 88

A184-1 Clutch Bearing

All R22s

SL-32

7 Nov 88

Overrunning of Sprag Clutch

Any R22 and especially those with A018 clutches manufactured or O/H 1 Feb 88 thru 31 Oct 88

SL-33

18 May 89

Aeroquip Corp. Bulletin No. 0001

S/Ns 0002-0820

SL-34

15 Sep 89

Excessive Oil Leakage from Tail Rotor Gearbox Breather Tube

All R22s

SL-35

6 Jun 90

Alignment of V-Belt Sheaves

All R22s

SL-36

5 Oct 90

Alignment of Fan Shaft Bearing Housing

All R22s

SL-37

  Nov 90

Carburetors Service Bulletins

All R22s

SL-38

22 Mar 91

Tail Rotor Paint Scheme

All R22s

SL-39

19 Apr 91

V-Belt Installation

S/Ns 0002-1770

SL-40

28 Aug 91

Tail Rotor Visual Guard

S/Ns 0002-1889

SL-41

13 Mar 92

False Low RPM Warning occurring during radio transmissions

S/Ns 0002-2059

SL-42

18 Jun 92

Replacement of Inlet Ducts

S/Ns 0002-2151

SL-43

8 Oct 92

Additional Caution Decal for Baggage Compartments

S/Ns 0002-2320

SL-44

20 Oct 92

Replacement of Fuel Shut-Off Guard

S/Ns 0002-2230

SL-45

23 Sep 94

T.R.G.B. Shaft - Keys Terminating Action for AD-94-17-07

Reference AD-94-17-07 and SB-74

SL-46

23 Sep 94

M.R. & T.R.G.B. Chip Detectors

All R22s

SL-47

10 Apr 96

"Governor Off" Caution Light

R22's without light

SL-48

4 Mar 97

A184 Upper Clutch Actuator Bearing

All R22s

SL-49

8 Sep 98

Master Battery Relay

S/Ns 2786, 2793, & 2797-2847, & all R22s factory overhauled 2-98 thru 7-98

SL-50

2 Oct 98

Mixture Control Cable Clamp

All R22s

SL-51

14 Apr 99

Tachometer Contact Assy in Magneto

-

SL-52

1 Aug 01

(Supersedes SL-49)

Master Battery Relay Upgrade

All R22s

SL-53

21 Nov 01

Visual Inspection of Main Rotor Blade Root Area

All R22s

SL-54

25 Mar 04

Revised Main Rotor Blade Retirement Life

All R22s

Revised 31 Mar 04

All R22s

Revised 17 Jun 04

All R22s

Main Rotor Blade Inspection

SL-56B

30 Apr 10

Main Rotor Blade Bond Maintenance

R44 SERVICE LETTERS (WITHOUT NUMBER) INDEX

DATE

SUBJECT

A/C AFFECTED

26 Jul 93

Replacement of Fuel Cap Gasket

S/Ns 0005-0012

1 Oct 93

Addition of Washers on Tail Rotor Pitch Arm

S/Ns 0014, 0015, and 0016

1 Nov 93

Upgrades for Fanwheel and Fanshaft

S/Ns 0014, 0015, 0016, and 0020

7 Jan 94

Required Recalibration of RPM Governor and Tach

S/Ns 0006, 0030, 0032, 0033, 0036, 0037, 0039, 0040, and 0043

7 Feb 94

Installation of Angle for Strobe Power Supply

S/Ns 0006-0030, 0032, 0033, 0036, 0037, 0039, 0040, and 0043

23 Mar 94

Door Lock Decal

S/Ns 0006, 0007, 0010-0026, 0028-0030, 0032, 0033, and 0036

30 May 97

Carburetor Modification

S/Ns 0307, 0311, 0315, 0318, 0322, 0323, & 0324

14 Nov 97

Fan Shaft Spacers

S/Ns 0370, 0375 thru 0378, 0382, 0384 thru 0387,0389, 0390, and 0391

16 Feb 98

Swashplate Assembly

S/Ns 0427, 0432, and 0434

9 Oct 98

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

11 Nov 98

Spindle Removal and Installation Fixture MT152-1

-

8 July 99

28-Volt National Airparts Alternator Bolts

S/Ns 0253, 0362, 0423, 0448, 0475, 0517, and 0527

31Jul 00

Pop-Out Float Covers

S/Ns 0652, 0653, 0664, 0668

31 Aug 00

Tailcone Battery Retention Straps

S/Ns 0253, 0358, 0362, 0402, 0423, 0448, 0475, 0503, 0508, 0514, 0517, 0527, 0565, 0582, 0592, 0600, 0621, 0641, 0681, 0697, 0709, and 0714

19 Dec 02

Mixture Guard

S/Ns 10002 thru 10011, 10013 thru 10015, 10018, 10020, & 10021

22 Jan 03

PRV/Topping Valves

S/Ns 1266, 1269, 1274, & 10008

20 Mar 03

Governor Controller

S/Ns 10001 thru 10047 except 10016, 10033, & 10046

09 May 03

Raven II Fuel Control P/N 2576630-1

S/Ns 10056 and 10067 thru 10073

R44 SERVICE LETTERS (WITH NUMBER) INDEX

NO

DATE

SUBJECT

A/C AFFECTED

SL-1

24 May 94

Adjustment of Main Rotor Spindle Boot and Fluid Level

S/Ns 0006-0070

SL-2

30 Jun 94

Air Intake Hose Chafing Frame

S/Ns 0001-0080

SL-3

28 Jul 94

Cyclic "Shot Bag" Damper

S/Ns 0001-0087

SL-4

7 Sep 94

Engine Breather Coupling

S/Ns 0001-0098

SL-5

4 Nov 94

Inspection of Push-Pull Tube Guides

All R44s

SL-6

5 May 95

Autorotation RPM Adjustment

S/Ns 0001-0144

SL-7

26 Dec 95

Cyclic Friction

S/Ns 0004-0225

SL-8

26 Dec 95

Cyclic Trim Elastic Cord

S/Ns 0004-0225

SL-9

26 Apr 96

Cyclic Trim System

S/Ns 0004-0190

SL-9A

2 May 96

Cyclic Trim System

S/Ns 0004-0190

SL-10

2 Aug 96

C439-7 Guide Assembly

All R44s

SL-11

25 Oct 96

Replacement of A185-2 and -5 brackets

S/Ns 0002 thru 0280, except 0007, 0118, 0224, & 0271

SL-12

24 Oct 96

Upgraded battery with battery cooling

S/Ns 0002 thru 0246

SL-13

24 Oct 96

Lateral cyclic trim assembly spring shaft wear

-

SL-14

30 May 97

Carburetor Modification

S/Ns 0001-0317 excl 0182, 0224, 0228, 0298, 0301,0307, 0311, 0312, 0314, & 0315

SL-15

2 Oct 98

Mixture Control Cable Clamp

All R44s

SL-15A

6 Oct 98

      "

All R44s

SL-16

8 Sep 98

Master Battery Relay

S/Ns 0437-0491, & all R44s factory overhauled 2-98 thru 7-98

SL-17

8 Sep 98

Collective Spring and Support

-

SL-18

14 Apr 99

Tachometer Contact Assembly in Magneto

-

SL-19

16 Sep 99

Oil Cooler

S/Ns 0001-0628 except S/N 0237, 0331, 0431, 0440, 0562, 0592, 0611, 0619, and 0621.

SL-20

17 Jan 00

Pitot Line Contact w/ Push-Pull Tube

-

SL-21

17 Jan 00

Stuck Exhaust Valves in Engine

-

SL-22

10 Feb 00

Belt Tension Actuator Troubleshooting

-

SL-23

01 Aug 01

Master Battery Relay Upgrade

All R44s w/ 14-volt.

SL-24

21Sep 01

Main Rotor Blade Tip Inspection

-

SL-25

10 Jun 02

Hydraulic Reservoir Vent

S/Ns1117 and prior equipped w/ hydraulic flight controls.

SL-26

19 Nov 03

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-27

15 Oct 04

Tail Pipe Extension

R44 & R44 II helicopters with oblique tailpipe exit.

SL-28

15 Oct 04

D040-1 Aft Cowling Assembly

R44 & R44 II

SL-29

15 Oct 04

              -

R44 & R44 II helicopters with optional four-point harnesses with detachable shoulder straps.

SL-30

20 Jul 05

Crankshaft Replacement

R44 helicopters with engine serial nos. or crankshaft serial nos. listed in Lycoming SB No. 566.

Main Rotor Blade Bond Maintenance 

SL-37

18 Jun 10

C016-7 Main Rotor Blades

-