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Service Directive Bulletins – Piston

A Service Directive Bulletin (SDB) is used to direct the owner/operator and/or maintenance personnel to make mandatory changes, improvements, or inspections to the aircraft.

The information provided in the Service Directive Bulletins will be incorporated into the maintenance manual as needed at a later date. At the time of incorporation, the SDB is superseded by the maintenance manual, and accomplishment or sigh-off of the SDB in the maintenance records book is no longer required. A detailed entry should be made in the maintenance records to indicate that the SDB is superseded by the maintenance manual.

PISTON SERVICE DIRECTIVE BULLETIN INDEX

  1. SDB 0001 – Main Rotor Transmission (04/12/1967)
  2. SDB 0002 – Main Rotor Transmission (07/26/1967)
  3. SDB 0003 – Ignition System (07/26/1967)
  4. SDB 0004 – Tail Rotor Blade Life (05/10/1968)
  5. SDB 0005 – Belt Drive Support Strut (08/04/1969)
  6. SDB 0006 – Lower Jackstrut Bearing O-ring (10/23/1969)
  7. SDB 0007 – Torque, MR XMSN Pinion Shaft Nut (10/24/1969)
  8. SDB 0008A – MR Control Pitch Link (10/22/1971)
  9. SDB 0009A – Idler Yoke Assemb)ly (05/30/1973)
  10. SDB 0010 – (CXL 02/03/2005)
  11. SDB 0011 – Taper Pins, TR Drive Shaft (03/29/1972)
  12. SDB 0012 – TR Output Shaft Seal Housing (05/18/1972)
  13. SDB 0013 – Idler Tension Straps (CXL 02/03/2005)
  14. SDB 0014 – MR Hub Nut (09/25/1972)
  15. SDB 0015 – Cyclic Stick Torque Tube (02/26/1973)
  16. SDB 0016C – Oil Level, TR Gearbox (09/25/1974)
  17. SDB 0017C – XMSN Overhaul Life (01/03/1983)
  18. SDB 0018A – Flight Procedure (02/15/1974)
  19. SDB 0019- Rotor Clutch Engagement (CXL 05/31/2001)
  20. SDB 0020B – MR Spindle (04/02/1982)
  21. SDB0021C – MR Spindle (04/02/1982)
  22. SDB 0022 – Inlet Air System (10/16/1974)
  23. SDB 0023 – Belt Tightening System (10/18/1974)
  24. SDB 0024 – MR Blade Inspection (12/17/1974)
  25. SDB 0025 – MR Hub Retention (07/31/1975)
  26. SDB 0026 – Cooling Air Turning Vane (07/21/1975)
  27. SDB 0027 – Over-Running Clutch (12/09/1975)
  28. SDB 0028 – Fuel Tank Vent Manifold (12/09/1975)
  29. SDB 0029A – Tail Cone Attachments Bolts (01/21/1976)
  30. SDB 0030 – Bellcrank, TR Control System (12/09/1975)
  31. SDB 0031 – MR Shaft (CXL 03/06/2000)
  32. SDB 0032 – Pitot Line (01/19/1976)
  33. SDB 0033 – TR Control Pitch Link Retention (01/21/1976).
  34. SDB 0034 – TR Pedal Clearance (01/22/1976)
  35. SDB 0035A – Upper Swashplate Bearing (7/09/1990)
  36. SDB 0036 – MR Shaft (08/02/1976)
  37. SDB 0037 – TR Spindle (01/17/1977)
  38. SDB 0038 – Stabilizer Attach Tube (CXL 02/03/2005)
  39. SDB 0039 – TR Drive Shaft After TR Strike (05/12/1977)
  40. SDB 0040 – Wide Chord TR Pitch Link Retainer (05/20/1977)
  41. SDB 0041 – TR Cable Corrosion (CXL 01/17/2020)
  42. SDB 0042 – Wide-Chord TR Counterweight (06/28/1977)
  43. SDB 0043 – Special Inspections, TR Controls (07/11/1977)
  44. SDB 0044 – TR Thrust Bearing Stack (08/08/1977)
  45. SDB 0045 – Engine Stoppage, High DA (11/02/1977)
  46. SDB 0046 – Dual Collective Reinstall (12/02/1977)
  47. SDB 0047 – MR XMSN (12/13/1978)
  48. SDB 0048A – Wide Chord TR Blade Grip (09/08/1980)
  49. SDB 0049 – MR XMSN Mounts Bolts (04/03/1979)
  50. SD B0050 – Collective Bellcrank (07/01/1980)
  51. SDB 0051 – MR XMSN Mounting Hardware (08/07/1980)
  52. SDB 0052 – Repair, Five Wire Connector (03/17/1981)
  53. SDB 0053 – Oil Pump Impeller (04/30/1981)
  54. SDB 0054R1 – Wastegate Linkage (CXL 11/11/2008)
  55. SDB 0055A – Clutch Control System (04/02/1982)
  56. SDB 0056 – Pitch Link Retainer, Pitch Control (12/02/1981)
  57. SDB 0057 – Lamiflex Bearings (01/11/1982)
  58. SDB 0058 – Induction Pressure Relief Valve (07/27/1982)
  59. SDB 0059 – Covers, Engine Compartment (06/18/1982)
  60. SDB 0060 – Lycoming SB & Bendix SB (07/28/1982)
  61. SDB 0061 – Clutch Engagement, Warning Light (11/12/1982)
  62. SDB 0062R1 – Belt Tensioning and Idler System (03/28/2025)
  63. SDB 0063 – Bendix Impulse Coupling (10/05/1982)
  64. SDB 0064 – Collective Friction Usage (10/19/1982)
  65. SDB 0065B – TRDS Spline Couplings (07/09/1980)
  66. SDB 0066 – Lateral Trim Actuator (10/01/1984)
  67. SDB 0067 – Narrow Chord TR Forged Grips (10/01/1984)
  68. SDB 0068A – Life Limit, Overrunning Clutch (07/09/1990)
  69. SDB 0069A – TBO, Overrunning Clutch (07/09/1990)
  70. SDB 0070 – Clutch Engagement Handle Guard (05/08/1986)
  71. SDB 0071 – Idle Mixture Adjustment (05/08/1986)
  72. SDB 0072 – Rotor Head Hub Plates (CXL 03/29/2007)
  73. SDB0073 – Wastegate Position Fixity (05/15/1987)
  74. SDB 0074 – Control Cable Corrosion (CXL 01/17/2020)
  75. SDB 0075 – TR Cable Blade Strike (06/08/1987)
  76. SDB 0076R1 – Stabilizer Spar & AMOC (06/03/2016)
  77. SDB 0077C – TR Spindle (06/05/2020)
  78. SDB 0078 – TR Gearbox Inspection (10/18/1989)
  79. SDB 0079 – Landing Gear Leg (10/18/1989)
  80. SDB 0080 – TR Drive Flex Couplings (10/18/1989)
  81. SDB 0081R2 – Lamiflex Bearing (02/03/2017)
  82. SDB 0082A – Trim Motor Operation (03/18/1993)
  83. SDB 0083 – MR Shafts (07/16/1993)
  84. SDB 0084R2 – Muffler (10/27/2010)
  85. SDB 0085 – Lycoming SB (CXL 07/20/2001)
  86. SDB 0086 – Electrical System, 12 Volt (CXL 07/20/2001)
  87. SDB 0087 – Drag Links Serialization (11/19/1996)
  88. SDB 0088 – Lower Swashplate (05/28/1997)
  89. SDB 0089R1 – TRGB Input Seal (01/07/2014)
  90. SDB 0090R3 – Voltage-Control (06/05/2024)
  91. SDB 0091R2 – Lower Swashplate (02/18/2025)
  92. SDB 0092R3  – Fuel Quantity System (08/03/2015)
  93. SDB 0093R1 – TR control Cable (12/09/2003)
  94. SDB 0094R2 – MR Shaft (02/15/2002)
  95. SDB 0095R1 – Idler Pulley Actuator Arm (10/15/2012)
  96. SDB 0096R2 – MR Push-Pull Rod (04/02/2019)
  97. SDB 0097 – Seal Belt Bracket (02/03/2005)
  98. SDB 0098 – ECD002-11 Bearing (CXL 08/25/2010)
  99. SDB 0099 – Tie Rod Assemblies (03/29/2006)
  100. SDB 0100 – Swashplate Rod End (04/28/2006)
  101. SDB 0101 – MR Control Rod Fittings (05/23/2006)
  102. SDB 0102 – MR Retention Hinge Pins (03/20/2007)
  103. SDB 0103 – Turbocharger Bypass Tube (05/03/2007)
  104. SDB 0104 – MR Pitch Change Bellcrank (10/06/2008)
    clarification
  105. SDB 0105 – Collective Bellcrank (10/17/2008)
  106. SDB 0106 – MR PItch Change Bellcrank (11/03/2008)
  107. SDB 0107 – Wastegate Linkage (11/07/2008)
  108. SDB 0108R1 – Cracked Pylons (09/14/2009)
  109. SDB 0109R1 – Idler Yoke (10/27/2010)
  110. SDB 0110R4 – Trim Warning (01/23/2012)
  111. SDB 0111R2 Tail Rotor Driveshaft and Tach Drive Pulley Guard (02-26-2025)
  112. SDB 0112 – Cooling Fan (09/22/2011)
  113. SDB 0113 – Trim Switch (09/27/2011)
  114. SDB 0114 – Pylon Tube (01/23/2012)
  115. SDB 0115 – Trim Relay (01/09/2013)
  116. SDB 0116R3 – Control Tube (04/11/2023)
  117. SDB 0117R4 – Drive Belt (11/21/2023)
  118. SDB 0118R1 – Idler Yoke, PN 28-13299-3 (12/11/2015)
  119. SDB 0119R3 – Main Rotor Spindle (06/24/2016)
    MPI Instruction Guide
  120. SDB 0120 – Collective Stick Socket (04/29/2015)
  121. SDB 0121 – Mixture Adjustment Rod Assembly (03/21/2016)
  122. SDB 0122R2 – Exhaust Clamps (04/26/2018)
  123. SDB 0123R1 – Oil Pressure Line, Restrictor (05/19/2017)
  124. SDB 0124 – Landing Gear Clamps (02/03/2017)
  125. SDB 0125R1 – Tail Rotor Rotating Controls (11/10/2017)
  126. SDB 0126R1 – Cabin Bellcrank Mount (07/06/2023)
  127. SDB 0127R2 – Rod End Bearing Assembly (06/20/2018)
  128. SDB 0128 – Copilot Collective Retention Pin (12/20/2017)
  129. SDB 0129 – Air Filter Container Door Hinge Pins (01/22/2019)
  130. SDB 0130 – Battery Hold Down (04/02/2019)
  131. SD B0131R1 – TR Cable Corrosion (01/17/2020)
  132. SDB 0132R1 – Clutch Handle Rigging (11/21/2023)

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