Service Directive Bulletins – Turbine

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 At the time of incorporation, the SDB is superseded by the maintenance manual, and accomplishment or sign-off of the SDB in the maintenance records book is no longer required. A detailed entry should be made in the maintenance records to indicate that the SDB is superseded by the maintenance manual.

Turbine Service Directive Bulletin Index

1. SDB T-001 – Ingestion, Inlet Duct Boots (CXL 02/16/2000)
2. SDB T-002 – MRGB, Ring Gear Carrier (12/04/1996)
3. SDB T-003 – MR Bellcrank (Walking Beam) (06/06/1996)
4. SDB T-004 – Horizontal Stabilizer Cap Screw (06/11/1996)
5. SDB T-005 – Lower Pulley Bearing (CXL 08/25/2010)
6. SDB T-006 – Isolation Mount (02/13/1997)
7. SDB T-007 – Swashplate Universal Housing (05/28/1997)
8. SDB T-008R3 – Oil Cooler Blower Shaft (05/27/2016)
9. SDB T-009 – Fuel Shutoff Valve (10/03/1997)
10. SDB T-010 – Swashplate (CXL 02/16/2000)
11. SDB T-011 – Bellmouth Engine Inlet seal (CXL 02/16/2000)
12. SDB T-012R1  – TRGB Input Seal (01/14/2014)
13. SDB T-013R2 – Oil Cooler Blower Flex Plates (08/05/2002)
14. SDB T-014R1 – Tailcone Vibration Absorber (10/06/2000)
15. SDB T-015 – Low Point Fuel drain Valve (10/06/2000)
16. SDB T-016 – Oil Cooler Impeller (02/15/2002)
17. SDB T-017 – Lower Pulley Drive (CXL 08/25/2010)
18. SDB T-018 – H-Strut (06/16/2003)
19. SDB T-019R2 – MR Push-Pull Rod (04/02/2019)
20. SDB T-020 – Pylon Assembly (08/18/2005)
21. SDB T-021 – Oleo Condition Placards (08/25/2005)
22. SDB T-022 – Overrunning Clutch Oil Level (12/23/2005)
23. SDB T-023 – Bearing Set Marking (CXL 08/25/2010)
24. SDB T-024- Swashplate Rod End (04/28/2006)
25. SDB T-025 – MR Control Rod Fittings (05/23/2006)
26. SDB T-026R1 – Power Output Shaft Bearing (02/14/2014)
27. SDB T-027R1 – Overrunning Clutch Cover (01/07/2008)
28. SDB T-028R2 – Turbine Engine Assembly (05/24/2016) 
29. SDB T-029 – MR Hinge (Retention) Pins (03/20/2007)
30. SDB T-030 – Circuit Breaker Bus Bar (05/14/2007)
31. SDB T-031 – Horizontal Stabilizer Spar Bolt (10/18/2007)
32. SDB T-032 – Tail Rotor Cable (07/25/2008)
33. SDB T-033R1 – Tailcone Inspection (12/23/2009)
34. SDB T-034 – MR Bellcrank (Walking Beam) (10/13/2008)
35. SDB T-035 – Bell Crank Chamfer (11/03/2008)
36. SDB T-036R1 – Flex Pack (12/12/2023)
37. SDB T-037 – Drive Belt Clearance (CXL 05/25/2012)
38. SDB T-038R1 – Engine Mount (05/05/2011)
39. SDB T-039R3 – Trim Warning (07/06/2011)
40. SDB T-040 – Cyclic Trim Actuator Switch (09/26/2011)
41. SDB T-041 – Mounting Hardware (11/28/2011)
42. SDB T-042R2 – Cyclic & Collective Control (11/07/2017)
43. SDB T-043 – Trim Relay (01/09/2013)
44. SDB T-044 (Reserved)
45. SDB T-045R1  – Collective Pin (06/25/2014)
46. SDB T-046R3  – Drive-Belt (11/07/2017)
47. SDB T-047 – TR Drive Shaft Bearing Assembly (09/25/2014)
48. SDB T-048 – Engine Idle Stop Assembly (09/18/2014)
49. SDB T-049 – Overrunning Clutch (11/06/2014)
50. SDB T-050R3 – Main Rotor Spindle (06/24/2016)
    MPI Instruction Guide
51. SDB T-051  – Fuel Tank Inspection (02/16/2015)
52. SDB T-052 – Engine Idle Stop Wiring (11/16/2015)
53. SDB T-053 – Air Particle Separator (11/02/2016)
54. SDB T-054 – Lamiflex Bearing Inspection (02/03/2017)
55. SDB T-055R1 – Tail Rotor Rotating Controls (11/10/2017)
56. SDB T-056 – Restraint Attachment (05/19/2017)
57. SDB T-057 – Fuel Quantity Transmitter (07/06/2017)
58. SDB T-058R1 – Rod End Bearing Assembly (06/20/2018)
59. SDB T-059 – Fuel Quantity Indicator (08/02/2017)
60. SDB T-060R1 – Upper Plenum Fiberglass (09/05/2018)
61. SDB T-061R1 – Lower Air Plenum Wedge Vane (10/29/2019)
62. SDB T-062R2 – Drag Strut Installation (05/06/2020)
63. SDB T-063 – Cargo Hook Inspection (09/10/2019)
64. SDB T-064 – Tailcone Bulkhead (08/25/2020)
65. SDB T-065 – XMSN Mount Pylon (10/13/2020)