# Leonardo Alert Service Bulletin 109K-076: No revision named - Rights: © Leonardo S.p.A. Filed by the FAA in regulations.gov docket FAA-2023-2238, the docket of AD 2024-15-11. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Leonardo Alert Service Bulletin 109K-076](https://openairdocs.org/service-documents/leonardo/109k-076.md) - Title as filed: Leonardo Helicopters ASB 109K-076 - Pages: 39 - PDF: https://openairdocs.org/files/sha256/dd/4d/dd4d28c2b1df67dea0b6ca3a1c776eb12a4974e24b70e2aeafebb66032b78cfd - Page: https://openairdocs.org/service-documents/leonardo/109k-076/file/dd4d28c2b1df ## Text Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 Pa ge 1 of 38 N° 109K-076 DA TE: March 21, 2023 REV. : / - M arch 15, 2017 TITLE ATA 64 – TAIL ROTOR HOUSING AND SLIDER GROUP DISASSEMBLY AND R EASSEMBLY REVISION LOG First Issue An appropriate entry should be made in the aircraft log book upon accomplishment. If ownership of aircraft has changed, please, forward to new owner. Leonardo S.p.A. Via Giovanni Agusta, 520 21017 Cascina Costa di Samarate (VA) Italy Tel.: +39 0331 229111 - Fax: +39 0331 229605/222595 ALERT SERVICE BULLETIN ### Page 2 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 2 of 38 REVISION: / 1. PLANNING INFORMATION A. EFFECTIVITY Part I: All A109K2 helicopters that have performed maintenance activities requiring the disassembly of the tail rotor duplex bearing housing after the helicopter delivery. Part II: All A109K2 helicopters. B. COMPLIANCE Part I: Within and not later than 100 (one hundred) flight hours or 6 (six) months, whichever occurs first, after the issue of this Service Bulletin. Part II: At each assembly of the tail rotor duplex bearing housing. C. CONCURRENT REQUIREMENTS N.A. D. REASON This Service Bulletin is issued in order to prescribe the disassembly and reassembly of the housing and slider assembly of the tail rotor rotating controls. E. DESCRIPTION There have been reported cases of ring-nut tighten loss, likely as a result of poor maintenance tasks accomplishment of the assembly instructions for the tail rotor housing and slider group. In order to minimize the likelihood of occurrence of potential human errors during maintenance, LH updated the maintenance instructions in order to provide additional guidelines, including a better identification Vital Points (VP) for the assembly of the tail rotor duplex bearing support. As such, this Service Bulletin requires (Part I) to perform the installation of the tail rotor duplex bearing housing following the IETP updated instructions and (Part II) requires to follow such updated instructions whenever the TR duplex bearing housing is assembled. During the procedure, the operator must obey the Local Regulations applicable to the Vital Points. ### Page 3 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 3 of 38 F. APPROVAL The technical content of this Service Bulletin is approved under the authority of DOA nr. EASA.21.J.005. EASA states mandatory compliance with inspections, modifications or technical directives and related time of compliance by means of relevant Airworthiness Directives. G. MANPOWER To comply with this Service Bulletin, the following MMH are deemed necessary: Part I: 8 (eight). Part II: N.A. MMH are based on hands-on time and can change with personnel and facilities available. H. WEIGHT AND BALANCE N.A. I. REFERENCES 1) PUBLICATIONS SECTION/PARAGRAPH DESCRIPTION PART PAR01 00-20-1 Helicopter Safety I PAR02 64-00-15 Tail rotor hub and blades assy – Removal/Installation I PAR03 64A-00-16 Tail rotor hub and blades assy – Removal/Installation I PAR04 64-00-17 Tail rotor hub and blades assy – Removal/Installation I PAR05 64A-00-18 Tail rotor hub and blades assy – Removal/Installation I PAR06 64-30-5 Pitch change mechanism – Removal/Installation I, II PAR07 64-31-6 Pitch change mechanism – Removal/Installation I, II 2) ACRONYMS & ABBREVIATIONS AMDI Aircraft Material Data Information MM Maintenance Manual DOA Design Organization Approval IETP Interactive Electronic Technical Publications EASA European Aviation Safety Agency LH Leonardo Helicopters PTUM Pictorial Tools Usage Manual ### Page 4 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 4 of 38 REVISION: / MMH Maintenance Man Hours P/N Part Number S/N Serial Number 3) ANNEX Annex A A109K2 MM Section 64-30 Rev. 5. Annex B A109K2 10001 thru 10015 and 10027 MM Section 64-31 Rev. 6. J. PUBLICATIONS AFFECTED N.A. K. SOFTWARE ACCOMPLISHMENT SUMMARY N.A. ### Page 5 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 5 of 38 2. MATERIAL INFORMATION A. REQUIRED MATERIALS 1) PARTS N.A. 2) CONSUMABLES Refer also to AMDI for the consumable materials required to comply with the MM Paragraphs referenced in the accomplishment instructions. 3) LOGISTIC MATRIX N.A. B. SPECIAL TOOLS Refer to PTUM for the special tools required to comply with the MM Paragraphs referenced in the accomplishment instructions. C. INDUSTRY SUPPORT INFORMATION N.A. ### Page 6 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 6 of 38 REVISION: / 3. ACCOMPLISHMENT INSTRUCTIONS GENERAL NOTES a) Place an identification tag on all components that are re-usable, including the attaching hardware that have been removed to gain access to the modification area and adequately protect them until their later re-use. b) Shape the cables in order to prevent interference with the structure and the other existing installations, using where necessary suitable lacing cords and plastic cable tiedown. PART I 1. In accordance with MM Paragraph 00-20-1, prepare the helicopter on ground for a safe maintenance. Disconnect the battery, all electrical power sources and/or the external power supply. 2. In accordance with MM Paragraph 64-00-15 or 64A-00-16 for A109K2, or with MM Paragraph 64-00-17 or 64A-00-18 for A109K2 10001 thru 10015 and 10027, remove from the helicopter the tail rotor hub and blades assembly. 3. In accordance with MM Paragraph 64-30-5 for A109K2, or MM Paragraph 64-31-6 for A109K2 10001 thru 10015 and 10027, remove the tail rotor pitch change mechanism. 4. In accordance with MM Paragraph 64-30-5 for A109K2, or MM Paragraph 64-31-6 for A109K2 10001 thru 10015 and 10027, disassemble the tail rotor housing and slider assembly. NOTE Vital Point (VP): the point of a component, assembly or installation, where incorrect assembly or an undetected error could cause the loss of rotorcraft and/or fatalities. 5. In accordance with MM Paragraph 64-30-5 Rev. 5 fo r A109K2 or MM Paragraph 64-31-6 Rev. 6 for A109K2 10001 thru 10015 and 10027 (Ref. Leonardo WebPortal or Annex A and/or Annex B of this Service Bulletin), assemble the tail rotor housing and slider assembly. 6. In accordance with MM Paragraph 64-30-5 for A109K2, or MM Paragraph 64-31-6 for A109K2 10001 thru 10015 and 10027, install the tail rotor housing and slider assembly. 7. In accordance with MM Paragraph 64-00-15 or 64A-00-16 for A109K2, or with MM Paragraph 64-00-17 or 64A-00-18 for A109K2 10001 thru 10015 and 10027, install on the ### Page 7 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 7 of 38 helicopter the tail rotor hub and blades assembly. 8. Return the helicopter to a ready to flight condition and record for compliance with Part I of this Service Bulletin on the helicopter logbook. 9. Send the attached compliance form to the following mail box: engineering.support.lhd@leonardo.com As an alternative, gain access to My Communications section on Leonardo WebPortal and compile the “Service Bulletin Application Communication”. ### Page 8 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 8 of 38 REVISION: / PART II NOTE Vital Point (VP): the point of a component, assembly or installation, where incorrect assembly or an undetected error could cause the loss of rotorcraft and/or fatalities. 1. During the application of any maintenance operati on requiring the assembly of the TR duplex bearing housing, it is required to perform the relevant assembly procedure in accordance with MM Paragraph 64-30-5 Rev. 5 for A109K2 or MM Paragraph 64-31-6 Rev. 6 for A109K2 10001 thru 10015 and 10027 (Ref. Leonardo WebPortal or Annex A and/or Annex B of this Service Bulletin) or later published issues. 2. Record for compliance with Part II of this Service Bulletin on the helicopter logbook. 3. Send the attached compliance form to the following mail box: engineering.support.lhd@leonardo.com As an alternative, gain access to My Communications section on Leonardo WebPortal and compile the “Service Bulletin Application Communication”.  Non cancellare mai questo segnalibro Non cancellare mai interruzione sezione  ### Page 9 ANNEX A S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 9 of 38 ANNEX A A109K2 MM SECTION 64-30 REV. 5 ### Page 10 (OCR) LEONARDO ANNEX A HELICOPTERS A109K2-MM _ MAINTENANCE MANUAL A109K2 HELICOPTER MODEL THIS 2nd ISSUE ENTIRELY SUPERSEDES ISSUE DATED 16th OCTOBER 1995 INCLUDING REVISION 15 DATED 15 SEPTEMBER 2010 Second Issue: 20th May 2014 Revision: No. 5 - 10th March 2023 THIS PUBLICATION IS ISSUED BY LEONARDO S.p.A. This document contains proprietary data and information and shall not be disclosed, reproduced in whole or in part for any purpose, other than helicopter operation or maintenance, without prior written authorization from LEONARDO S.p.A. PUBLICATION CODE 502051275 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 10 of 38 REVISION: / ### Page 11 (OCR) ANNEX A * LEONARDO HELICOPTERS A109K2-MM SECTION 64-30 PITCH CHANGE MECHANISM 64-30-1. DESCRIPTION 64-30-2. PITCH CHANGE MECHANISM The pitch change mechanism, mounted on the 90° gearbox, consists of a sleeve sliding on the 90° output shaft, con- nected to the tail rotor blades by a slider and two pitch links, and to the control pedals by links and levers. The components of the pitch change mechanism are shown in figure 64-19. 64-30-3. MAINTENANCE 64-30-4. PITCH CHANGE MECHANISM 64-30-5. Removal/installation (Fig 64-19) A. Input Conditions (1) Required conditions: - Helicopter safe for maintenance (Chap 00). - Access panels 11 and 60 removed (Sect 06-40, fig 06-4). - Tail rotor hub and blade assembly removed (Sect 64-00). (2) Support equipment: - Tool, T/R pitch change slider ring nut removal/installation (LSE NO 10). - Tool, T/R pitch change housing ring nut removal/installation (LSE NO 11). Tool, T/R pitch change housing duplex bearing removal (LSE NO 12). Tool, T/R pitch change housing duplex bearing installation (LSE NO 13). - Tool, T/R pitch change slider removal (LSE NO 14). - Ring, T/R slider bushing installation (LSE NO 19) . - Syringe (Local supply). - Heating gun (Local supply). - Feeler gage (Local supply). - Depth micrometer gage (Local supply). - Refrigerator (Local supply). Rev. 5 64-1 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 11 of 38 ### Page 12 (OCR) K LEONARDO ANNEX A HELICOPTERS A109K2-MM (3) Consumable materials: WARNING: THE CONSUMABLE MATERIALS THE NOMENCLATURE OF WHICH IS PREFIXED BY "(D)" ARE DANGEROUS MATERIALS. BEFORE USE, MAKE SURE TO KNOW THE SAFETY PRECAUTIONS AND FIRST AID INSTRUC- TIONS PRINTED ON: - THE LABEL ON THE CONTAINER THE MATERIAL WAS SUPPLIED IN - THE MATERIAL SAFETY DATA SHEET - THE LOCAL SAFETY REGULATIONS. ALSO MAKE SURE THAT THE APPLICABLE FIRST AID MATERIALS ARE AVAILABLE. - (D) MEK (C005). - (D) Sealing compound (C029). Safety wire (C014). (D) Primer (C446). (D) Grease (C594). Soft lint-free cloth (C011). (D) Solvent, cleaning (C023). (D) Oil (C139). (D) Primer (C237). (4) Other recommendations: WARNING: THIS INSTALLATION INCLUDES VITAL POINTS (VP). DURING THE PROCEDURE, YOU MUST OBEY THE LOCAL REGULATIONS APPLICABLE TO THE VITAL POINTS. CAUTION: MAKE SURE THAT YOU DO NOT MIX GREASES OF DIFFERENT BRANDS ALTHOUGH THE SPECIFICATIONS ARE THE SAME. REFER TO THE HELICOPTER LOG BOOK TO PREVENT MIXTURE OF UNWANTED GREASES. CAUTION: THIS COMPONENT INCLUDES CRITICAL PARTS. EXAMINE THE COMPONENT FOR SIGNS OF STRUCTURAL DAMAGE, BEFORE YOU INSTALL IT ON THE HELICOPTER B. Removal Procedure. (1) Disconnect tail rotor pitch control tube (59) from lever (49) by removing attaching hardware. Discard cotter pin. (2) Disconnect forward link (30) from sleeve (27) and aft link (35) from slider (23) by removing attaching part. Discard cotter pins. (3) Detach link (35) from link (30) by removing attaching parts. Discard cotter pin. (4) Cut lockwire from forward boot (26) and withdraw sleeve (25) from gearbox shaft. Remove forward boot (26) from sleeve (25). If loose remove bushing (27) ref to para 64-30-11. NOTE: Mark position of links (20) to reconnect in same position during reassembly on slider. (5) Disconnect link (20) from slider (23) by removing parts; remove link (20). Discard cotter pin. (6) Remove links (10) by removing attaching parts. Discard cotter pins. 64-2 Rev. 5 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 12 of 38 REVISION: / ### Page 13 (OCR) ANNEX A A LEONARDO HELICOPTERS A109K2-MM (7) Cut lockwire from boot (39). (8) Withdraw housing (15), together with assembled parts, from gearbox shaft. (9) Disassemble housing and slider assembly as follows: (a) Open the two clawed tabs on the lock ring (16) then remove it from the ring nut (17). CAUTION: MAKE SURE THAT THE TOOL IS PERFECTLY ALIGNED WITH THE DUPLEX BEARING WHEN YOU PRESS IT OUT IN ORDER TO PREVENT DUPLEX BEARING DAMAGE. (b) Unscrew ring nut (17) from slider (23) using tool (LSE NO 10). (c) Withdraw slider (23) from housing (15) using tool (LSE NO 19) (d) Cut the safety wire and unscrew ring nut (19) from housing (15) using tool (LSE NO 11). (e) Remove duplex bearing (18) from housing (15) using tool (LSE NO 12). (f) Deleted. (10) Remove boot (39). (11) Remove attaching parts of levers (5 and 49), then remove levers and shims (8) and extract pivot (9) from lugs on gearbox. (12) Disconnect lever (40) from link (46) by removing attaching parts, remove lever (40). Discard cotter pin. (13) Disconnect link (46) from lugs on gearbox by removing attaching parts; remove washers and shims remove link (46). Discard cotter pin. C. Installation Procedure. (1) Position pivot (9, fig 64-19) in 90° gearbox lugs. (2) Install laminated shims (8) and levers (5 and 49) on pivot (9). Do not torque attaching parts. NOTE: If any of the following items: 90° gearbox case, pivot (9) levers (5 and 49) laminated shims (8) have been replaced, proceed as follows: (a) Position pivot (9) in 90° gearbox lugs. (b) Position levers (5 and 49) on pivot (9) without shims and secure temporarily in position. (c) Measure the total gap between one lever and the adjacent lug with a feeler gauge. Half of the gap is dimen- sion of each laminated shim (8). (d) Remove levers (5 and 49) from pivot (9). (e) Fit laminated shims (8) on pivot (9) then reinstall levers (5 and 49) and secure. Do not torque nuts (3 and 51) at this time. (1) Check for free rotation of pivot. If shim thickness is unsatisfactory, modify the shims the same amount on either side to obtain an axial play between 0,03 to 0,08 mm between 90° gearbox lugs bearings and levers (5 and 49) when installed. NOTE: Before installing the boot in the housing and slider group deform the boot metallic rim to an oval shape with a maximum diameter of 43 thru 44 mm (1.693 thru 1.732 in) as shown in figure 64-19. This is to help a tighter fit in the seat. Put the inboard boot in its position in the housing and slider group. Rev. 4 643 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 13 of 38 ### Page 14 (OCR) ANNEX A ý LEONARDO HELICOPTERS A109K2-MM (3) Position boot (39) on gearbox shatt. (4) Reassembly housing and slider assembly as follows: CAUTION: BEFORE YOU ASSEMBLE THE HOUSING AND SLIDER GROUP (1, FIG. 64-20), PUT THE COM- PONENT THAT FOLLOW AND THE RELATED ATTACHING PARTS ON AN APPLICABLE WORK TABLE. CAREFULLY EXAMINE THE COMPONENT AND THE RELATED ATTACHING PARTS FOR CORROSION, NICKS AND DAMAGE, WEAR AND FRETTING. IF YOU FIND THAT THE COMPO- NENT IS DAMAGED, REPLACE IT. - THE DUPLEX BEARING (4) - THE HOUSING (5). (a) Divide the two parts of the duplex bearing (4). NOTE: Do Step C. (4)(%) thru Step C. (4)(d) only for removed bearings. New bearings are supplied already lubricated and must not be filled with grease. (b) Fill the Syringe (Local supply) with the Grease (C594). (c) Before you install the bearing (8), fill it with 3.5 cc (0.21 in?) of grease with the syringe from the side opposite to the boot. Refer to Detail A of Fig. 64-20. (d) Do Step C. (4)(c) again on the bearing (9). (e) Put the bearing (8) against the bearing (9) with the boot sides externally and the internal and external V- marks aligned to show an arrow. See Detail A, Fig. 64-20. (f) Install the duplex bearing (4) into the housing (5) in the way that follows: 1. Apply a thin layer of Primer (C446) on the mating surfaces between the duplex bearing (4) and hous- ing (5). 2. Put the housing (5) on the Base (10), part of the tool (LSE NO 13). WARNING: BE CAREFUL WHEN YOU USE HEAT. HOT PARTS CAN CAUSE INJURY TO THE PERSONS. ALWAYS USE APPLICABLE PROTECTIVE CLOTHING. 3. Heat the housing (5) to a temperature between 60 and 70 °C with the Heating gun (Local supply). This will help you to install the duplex bearing (4) into the housing. Make sure that the temperature is not more than 90 °C (heating gun set to a temperature of 90 °C). NOTE: As an alternative to heating the housing (5); you can cool down the duplex bearing (4) with the Refrigerator (Local supply) to a temperature between -18 and -40 °C for 30 minutes. Do not touch the cold duplex bearing with bare hands to prevent injury. 4. Push the duplex bearing (4) into the housing (5). To do this, use the Pin (11), part of the tool (LSENO 13) and an applicable arbor press. 5. Make sure there is no clearance between the two bearings (8 and 9) and between the outer ring of duplex bearing (4) and the shoulder of the housing (5). To do this, use the applicable Feeler gage (Local supply). 6. Remove the housing-bearing assembly (12) from the base (10). NOTE: Before you continue, make sure that all the components are at ambient temperature. (g) Install the ring nut (3) into the housing-bearing assembly (12). Obey the instructions that follow: 64-4 Rev. 5 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 14 of 38 REVISION: / ### Page 15 (OCR) ANNEX A K LEONARDO HELICOPTERS A109K2-MM 1. Clean the threads of the ring nut (3) and the housing (5) with the Cloth, soft lint-free (C011) and the Solvent, cleaning (C023). (VP) 2. Dry the threads of the ring nut (3) and the housing (5) with a clean Cloth, soft lint-free (C011). (VP) 3. Apply a layer of Primer (C237) on the threads of the ring nut (3). 4. Apply a layer of Primer (C237) on the threads of the housing (5). 5. Apply four drops of Sealing compound (C029) on the threads of the ring nut (3). Put them in four equally spaced positions (90 degrees apart). (VP) 6. Lock the Base (14), part of the tool (LSE NO 11) in an applicable vice. I. Put the housing-bearing assembly (12) on the base (14), then lock it with the two Bolts (13), part of the tool (LSE NO 11). Install the ring nut (3) in the housing-bearing assembly (12) with the Wrench (15), part of the tool (LSE NO 11). 9. Torque the ring nut (3) to 118 thru 127 Nm (87 thru 94 1bf ft). (VP) 10. Make sure that the duplex bearing (4) turns freely. (VP) 11. Refer to Detail B of Fig. 64-20. a. Measure and record the dimension L. b. Make sure that the dimension you find is between 23.75 to 24.0 mm (0.935 to 0.945 in). If you find that the dimension is not in the given limits, remove the duplex bearing (4). Then, do Step C. (4)(f) and Step C.(4)(g) again. 12. Refer to Detail C of Fig. 64-20. a. Measure and record the dimension M. b. Calculate and record the dimension N with this formula: N = M - L 13. Remove the housing group (16) from the base (14). NOTE: The safety wire must be installed with the double-twist method and put in tension. Example of an acceptable safety wire installation is shown in Detail B1 of Fig. 64-20. As a general approach, an "o" angle between 60° and 120° is adviseable. 14. Safety the ring nut (3) to the housing (5) with the new Safety wire (C014) in two places as shown in Detail B1 of Fig. 64-20. Refer also to Section 20-10. (VP) (h) Apply a thin layer of Oil (C139) on the internal surface of the duplex bearing (4). (i) Put the Bushing (18), part of the tool (LSE NO 14) in its position on the Pin (19), part of the tool (LSE NO 14). (1) Put the housing group (16) on the pin (19) above the bushing (18). (k) Put the slider (2) on the pin (19). Rev. 5 645 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 15 of 38 ### Page 16 (OCR) K LEONARDO ANNEX A HELICOPTERS A109K2-MM NOTE: To help you install the slider (2), heat the housing group (16) in an oven preheated to a temperature of 50 °C for 15 to 30 minutes. As an alternative to heating the housing group (16); you can cool down the slider (2) with the Refrigerator (Local supply) to a temperature between -18 and -40 °C for 30 minutes. Do not touch the cold slider with bare hands to prevent injury. (1) Push the slider (2) into the housing group (16). To do this, use the Barrel (17), part of the tool (LSE NO 14) and an applicable arbor. (m) Remove the housing-slider assembly (20) from the pin (19). NOTE: Before you continue, make sure that all the components are at ambient temperature. (n) Make sure there is no clearance between the inner rings of the two bearings (8 and 9) and the shoulder of the slider (2). To do this, use the applicable Feeler gage (Local supply). (o) Refer to Detail D of Fig. 64-20: 1. Measure and record the dimension N. To do this, use an applicable Depth micrometer gage (Local supply). 2. Make sure that the dimension N measured agrees with the dimension calculated at Step C. (4)(g) 12.b. 3. If you find that the dimension N does not agree, remove the duplex bearing (4). Then, do Step C. (4)(1) and Step C. (4)(o) again. (p) Lock the Base (22), part of the tool (LSE NO 10) in an applicable vice. (q) Put the housing-slider assembly (20) on the base (22). (r) Move the braces (23) of the slider against the pins (24) of the base (22). Refer to Detail E of Fig. 64-20. (s) Clean the threads of the ring nut (6) and the slider (2) with the Cloth, soft lint-free (C011) and the Solvent, cleaning (C023). (VP) (t) Dry the threads of the ring nut (6) with a clean Cloth, soft lint-free (C011). (VP) (u) Apply a layer of Primer (C237) on the threads of the ring nut (6). (v) Apply a layer of Primer (C237) on the threads of the slider (2). (w) Apply four drops of Sealing compound (C029) on the threads of the ring nut (6). Put them in four equally spaced positions (90 degrees apart). (VP) (x) Install the ring nut (6) with the Wrench (21), part of the tool (LSE NO 10). (y) Torque the ring nut (6) to 49 thru 59 Nm (36 thru 43 1bf ft). (VP) (z) Remove the housing and slider group (1) from the base (22). (aa) Install the new Lock ring (7). (ab) Bend the clawed tabs of the lock ring (7) on the ring nut (6). Make sure that the two clawed tabs of the lock ring (7) are correctly engaged. (5) Connect lever (40) and links (10) to housing (15). Torque nuts to 3,4-4,5 Nm, then install cotter pins. 64-6 Rev. 5 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 16 of 38 REVISION: / ### Page 17 (OCR) LEONARDO ANNEX A HELICOPTERS A109K2-MM Washer 23. Slider 44. Bolt (*) 24. Bushings (**) 45. Bolt (*) 24A. Bushings (***) 46. Link 25. Bushings (***) 46A. Washer 26. Boot 46B. Shim 27. Sleeve 47. Bolt 28. Nut 48. Washer 29. Washer 49. • Lever 30. Link, fwd 50. Washer 31. Washer 51. Nut Nut 32. Bolt (*) 52 Bolt (*) Washer 33. Nut 53. Washer Spacer 34. Washer 54. Nut Bolt (*) 35. Link, aft 55. Deleted Housing 36. Washer 56. Deleted 15A. Shim 37. Bolt (*) 57. Washer Lock ring 38. Nut 58. Bolt (*) Ring nut 39. Boot 58A. Nut Duplex bearing 40. Lever 59. Tail rotor pitch control tube (ref) 19 Ring nut 40A. Bumper washer 60. Washers 20 Link 41. Nut 61. Fitting, T/R gearbox Bolt (*) 42. Washer 62 Bushings 22 Washer 43. Washer These bolts are provided with cotter pins which are not illustrated for clarity of representation. (**) Used with slider P/N 109-0130-91-105. (***) Used with slider P/N 109-0130-91-1171-119 Figure 64-19 (sheet 3 of 3). Pitch change mechanism SEE DETAIL A BUSHING SLEEVE DETAIL A SCRIBER AGED1136A Figure 6419A. Tail rotor sleeve - Mating surface inspection Rev. 3 6413 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 17 of 38 ### Page 18 (OCR) · LEONARDO ANNEX A HELICOPTERS A109K2-MM 1. Housing and slider group 16. Housing group 2. Slider 17. Barrel (Part of the LSE NO 14) 3. Ring nut 18. Bushing (Part of LSE NO 14) 4. Douplex bearing 19. Pin (Part of LSE NO 14) 5. Housing 20. Housing-slider assembly 6. Nut 21. Wrench (Part of LSE NO 10) 7. Lock ring 22. Base (Part of LSE NO 10) 8. Bearing 23. Brace 9. Bearing 24. Pin 10. Base (Part of LSE NO 13) 11. Pin (Part of LSE NO 13) 12. Housing-bearing assembly 13. Bolt (Part of LSE NO 11) 14. Base (Part of LSE NO 11) 15. Wrench (Part of LSE NO 11) V-MAER (AEF) INTERNAL BORE SIDE V-MARK (REF) INTERNAL V-MARK (REF) INTERNAL 3001 SIDE 9 SIDE A6ED1098B Figure 64-20 (sheet 1 of 5). Housing and slider assembly 64-14 Rev. 5 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 18 of 38 REVISION: / ### Page 19 (OCR) * LEONARDO ANNEX A HELICOPTERS A109K2-MM 12 A6ED1253A Figure 64-20 (sheet 2 of 5). Housing and slider assembly Rev. 5 64-15 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 19 of 38 ### Page 20 (OCR) ANNEX A K LEONARDO HELICOPTERS A109K2-MM HOUSE BEARING ASSY SAFETY WIRE - SAFETY WIRE RING NUT SAFETY WIRING SCHEME OF RING NUT AGED 1254A Figure 64-20 (sheet 3 of 5). Housing and slider assembly 64-16 Rev. 5 Page 20 of 38 ### Page 21 (OCR) · LEONARDO ANNEX A HELICOPTERS A109K2-MM 20 18 19 A6ED1255A Figure 64-20 (sheet 4 of 5). Housing and slider assembly Rev. 5 6417 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 21 of 38 ### Page 22 (OCR) ANNEX A K LEONARDO HELICOPTERS A109K2-MM 20 23 24 22 ROTATION SENSE 23 24 - Figure 64-20 (sheet 5 of 5). Housing and slider assembly 64-18 Page 22 of 38 ### Page 23 ANNEX B S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 23 of 38 ANNEX B A109K2 10001 THRU 10015 AND 10027 MM SECTION 64-31 REV. 6 ### Page 24 (OCR) LEONARDO ANNEX B HELICOPTERS A109K2-MM - MAINTENANCE MANUAL A109K2 HELICOPTER MODEL S/N 10001 through S/N 10015 and S/N 10027 Second Issue: 31st October 2010 Revision: No. 6 - 10th March 2023 THIS PUBLICATION IS ISSUED BY LEONARDO S.p.A. This document contains proprietary data and information and shall not be disclosed, reproduced in whole or in part for any purpose, other than helicopter operation or maintenance, without prior written authorization from LEONARDO S.p.A. PUBLICATION CODE 502051272 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 24 of 38 REVISION: / ### Page 25 (OCR) ANNEX B * LeoNArDO HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 SECTION 64-31 PITCH CHANGE MECHANISM 64-31-1. DESCRIPTION 64-31-2. PITCH CHANGE MECHANISM The pitch change mechanism, mounted on the 90° gearbox, consists of a sleeve sliding on the 90° output shaft, connected to the tail rotor blades by a slider and two pitch links, and to the control pedals by links and levers. The components of the pitch change mechanism are shown in figure 64-20. 64-31-3. MAINTENANCE 6431-4. GENERAL INFORMATION The maintenance procedures for the pith change mechanism cover the Line Replaceable Units (LRU) listed in table 64-4. The maintenance procedures include removal/installation, adjustment/test, inspection/check, cleaning/painting and repair instructions as applicable. Table 64-4. LRU of pitch change mechanism FIG AND DESCRIPTION PAGE BLOCK INDEX NO 64-20 PITCH CHANGE MECHANISM 64-31-01 64-31-00 64-1 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 25 of 38 ### Page 26 (OCR) * LEONARDO ANNEX B HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 64-31-5. PITCH CHANGE MECHANISM 64-31-6. Removal/installation (Fig 64-20) A. Input conditions (1) Required conditions: - Helicopter safe for maintenance (Chap 00). - Access panels 11 and 61 removed (Chap 06). - Tail rotor hub hand blade assembly removed (Sect 64-00). (2) Support equipment: Tool, T/R pitch change slider ring nut removal/installation (LSE NO 66). Tool, T/R pitch change housing ring nut removal/installation (LSE NO 67). Tool, T/R pitch change housing duplex bearing removal (LSE NO 72). Tool, T/R pitch change housing duplex bearing installation (LSE NO 71). Tool, T/R pitch change slider installation (LSE NO 73). Tool, T/R pitch change slider removal (LSE NO 169) Syringe (Local supply) Heating gun (Local supply) Feeler gage (Local supply) Depth micrometer gage (Local supply) Refrigerator (Local supply) (3) Consumable materials: WARNING: THE CONSUMABLE MATERIALS THE NOMENCLATURE OF WHICH IS PREFIXED BY "(D)" ARE DANGEROUS MATERIALS. BEFORE USE, MAKE SURE TO KNOW THE SAFETY PRECAU- TIONS AND FIRST AID INSTRUCTIONS PRINTED ON: - THE LABEL ON THE CONTAINER THE MATERIAL WAS SUPPLIED IN - THE MATERIAL SAFETY DATA SHEET - THE LOCAL SAFETY REGULATIONS. ALSO MAKE SURE THAT THE APPLICABLE FIRST AID MATERIALS ARE AVAILABLE. (D) Sealing compound (C029). 64-31-01 64-2 Rev. 6 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 26 of 38 REVISION: / ### Page 27 (OCR) ANNEX B * LEONARDO HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 - (D) Grease (C594). - Safety wire (C013). - (D) Lubricating oil (C139). - Safety wire (C014) - (D) Primer (C446) - Cloth, soft lint-free (C011) - (D) Solvent, cleaning (C023) - (D) Primer (C237) (4) Other recommendations: WARNING: THIS INSTALLATION INCLUDES VITAL POINTS (VP). DURING THE PROCEDURE, YOU MUST OBEY THE LOCAL REGULATIONS APPLICABLE TO THE VITAL POINTS CAUTION: MAKE SURE THAT YOU DO NOT MIX GREASES OF DIFFERENT BRANDS ALTHOUGH THE SPECIFICATIONS ARE THE SAME. REFER TO THE HELICOPTER LOG BOOK TO PREVENT MIXTURE OF UNWANTED GREASES. CAUTION: THIS COMPONENT INCLUDES CRITICAL PARTS. EXAMINE THE COMPONENT FOR SIGNS OF STRUCTURAL DAMAGE, BEFORE YOU INSTALL IT ON THE HELICOPTER 64-31-01 Rev. 6 643 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 27 of 38 ### Page 28 (OCR) K LEONARDO ANNEX B HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 46B 46A > 41 39 43 thru 44 mm (1.693 thru 1.732 in) Figure 64-20 (sheet 1 of 3). Pitch change mechanism 64-31-01 64-4 Rev. 3 Page 28 of 38 ### Page 29 (OCR) ANNEX B K LEONARDO HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 (3) Position boot (39) on gearbox shaft. (4) Reassembly housing and slider assembly as follows: CAUTION: BEFORE YOU ASSEMBLE THE HOUSING AND SLIDER GROUP (1, FIG. 64-21), PUT THE COM- PONENT THAT FOLLOW AND THE RELATED ATTACHING PARTS ON AN APPLICABLE WORK TABLE. CAREFULLY EXAMINE THE COMPONENT AND THE RELATED ATTACHING PARTS FOR CORROSION, NICKS AND DAMAGE, WEAR AND FRETTING. IF YOU FIND THAT THE COMPO- NENT IS DAMAGED, REPLACE IT. - THE DUPLEX BEARING (4) - THE HOUSING (5). (a) Divide the two parts of the duplex bearing (4). NOTE: Do Step C. (4)(b) thru Step C. (4)(d) only for removed bearings. New bearings are supplied already lubricated and must not be filled with grease. (b) Fill the Syringe (Local supply) with the Grease (C594). (c) Before you install the bearing (8), fill it with 3.5 cc (0.21 in?) of grease with the syringe from the side opposite to the boot. Refer to Detail A of Fig. 64-21. (d) Do Step C. (4)(c) again on the bearing (9). (e) Put the bearing (8) against the bearing (9) with the boot sides externally and the internal and external V- marks aligned to show an arrow. See Detail A, Fig. 64-21. (f) Install the duplex bearing (4) into the housing (5) in the way that follows: 1. Apply a thin layer of Primer (C446) on the mating surfaces between the duplex bearing (4) and hous- ing (5). 2. Put the housing (5) on the Base (10), part of the tool (LSE NO 71). WARNING: BE CAREFUL WHEN YOU USE HEAT. HOT PARTS CAN CAUSE INJURY TO THE PERSONS. ALWAYS USE APPLICABLE PROTECTIVE CLOTHING. 3. Heat the housing (5) to a temperature between 60 and 70 °C with the Heating gun (Local supply). This will help you to install the duplex bearing (4) into the housing. Make sure that the temperature is not more than 90 °C (heating gun set to a temperature of 90 °C). NOTE: As an alternative to heating the housing (5); you can cool down the duplex bearing (4) with the Refrigerator (Local supply) to a temperature between -18 and -40 °C for 30 minutes. Do not touch the cold duplex bearing with bare hands to prevent injury. 4. Push the duplex bearing (4) into the housing (5). To do this, use the Pin (11), part of the tool (LSE NO 71) and an applicable arbor press. Make sure there is no clearance between the two bearings (8 and 9) and between the outer ring of duplex bearing (4) and the shoulder of the housing (5). To do this, use the applicable Feeler gage (Local supply). 6. Remove the housing-bearing assembly (12) from the base (10). NOTE: Before you continue, make sure that all the components are at ambient temperature. (g) Install the ring nut (3) into the housing-bearing assembly (12). Obey the instructions that follow: 64-31-01 Rev. 6 649 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 29 of 38 ### Page 30 (OCR) K LEONARDO ANNEX B HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 1. Clean the threads of the ring nut (3) and the housing (5) with the Cloth, soft lint-free (C011) and the Solvent, cleaning (C023). (VP) 2. Dry the threads of the ring nut (3) and the housing (5) with a clean Cloth, soft lint-free (C011). (VP) 3. Apply a layer of Primer (C237) on the threads of the ring nut (3). 4. Apply a layer of Primer (C237) on the threads of the housing (5). 5. Apply four drops of Sealing compound (C029) on the threads of the ring nut (3). Put them in four equally spaced positions (90 degrees apart). (VP) 6. Lock the Base (14), part of the tool (LSE NO 67) in an applicable vice. Put the housing-bearing assembly (12) on the base (14), then lock it with the two Bolts (13), part of the tool (LSE NO 67). Install the ring nut (3) in the housing-bearing assembly (12) with the Wrench (15), part of the tool (LSE NO 67). Torque the ring nut (3) to 118 thru 127 Nm (87 thru 94 1bf ft). (VP) 10. Make sure that the duplex bearing (4) turns freely. (VP) 11. Refer to Detail B of Fig. 64-21. a. Measure and record the dimension L. b. Make sure that the dimension you find is between 23.75 to 24.0 mm (0.935 to 0.945 in). If you find that the dimension is not in the given limits, remove the duplex bearing (4). Then, do Step C. (4)(f) and Step C.(4)(g) again. 12. Refer to Detail C of Fig. 64-21. a. Measure and record the dimension M. b. Calculate and record the dimension N with this formula: N =M - L. 13. Remove the housing group (16) from the base (14). NOTE: The safety wire must be installed with the double-twist method and put in tension. Example of an acceptable safety wire installation is shown in Detail B1 of Fig. 64-21. As a general approach, an "o" angle between 60° and 120° is adviseable. 14. Safety the ring nut (3) to the housing (5) with the new Safety wire (C014) in two places as shown in Detail B1 of Fig. 64-21. Refer also to Section 20-10. (VP) (h) Apply a thin layer of Oil (C139) on the internal surface of the duplex bearing (4). (i) Put the Bushing (18), part of the tool (LSE NO 73) in its position on the Pin (19), part of the tool (LSE NO 73). (1) Put the housing group (16) on the pin (19) above the bushing (18). (k) Put the slider (2) on the pin (19). 64-31-01 64-10 Rev. 6 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 30 of 38 REVISION: / ### Page 31 (OCR) K LEONARDO ANNEX B HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 NOTE: To help you install the slider (2), heat the housing group (16) in an oven preheated to a temperature of 50 °C for 15 to 30 minutes. As an alternative to heating the housing group (16); you can cool down the slider (2) with the Refrigerator (Local supply) to a temperature between -18 and -40 °C for 30 minutes. Do not touch the cold slider with bare hands to prevent injury. (1) Push the slider (2) into the housing group (16). To do this, use the Barrel (17), part of the tool (LSE NO 73) and an applicable arbor: (m) Remove the housing-slider assembly (20) from the pin (19). NOTE: Before you continue, make sure that all the components are at ambient temperature. (n) Make sure there is no clearance between the inner rings of the two bearings (8 and 9) and the shoulder of the slider (2). To do this, use the applicable Feeler gage (Local supply). (o) Refer to Detail D of Fig. 64-21: 1. Measure and record the dimension N. To do this, use an applicable Depth micrometer gage (Local supply). Make sure that the dimension N measured agrees with the dimension calculated at Step C. (4)(g)12.b 3. If you find that the dimension N does not agree, remove the duplex bearing (4). Then, do Step C. (4)(f) and Step C. (4)(o) again. (p) Lock the Base (22), part of the tool (LSE NO 60) in an applicable vice. (q) Put the housing-slider assembly (20) on the base (22). (r) Move the braces (23) of the slider against the pins (24) of the base (22). Refer to Detail E of Fig. 64-21 (s) Clean the threads of the ring nut (6) and the slider (2) with the Cloth, soft lint-free (C011) and the Solvent, cleaning (C023). (VP) (t) Dry the threads of the ring nut (6) with a clean Cloth, soft lint-free (C011). (VP) (u) Apply a layer of Primer (C237) on the threads of the ring nut (6). (v) Apply a layer of Primer (C237) on the threads of the slider (2). (w) Apply four drops of Sealing compound (C029) on the threads of the ring nut (6). Put them in four equally spaced positions (90 degrees apart). (VP) (x) Install the ring nut (6) with the Wrench (21), part of the tool (LSE NO 66). (y) Torque the ring nut (6) to 49 thru 59 Nm (36 thru 43 1bf ft). (VP) (z) Remove the housing and slider group (1) from the base (22). (aa) Install the new Lock ring (7). (ab) Bend the clawed tabs of the lock ring (7) on the ring nut (6). Make sure that the two clawed tabs of the lock ring (7) are correctly engaged. (5) Degrease the threads of the ring nut (17, Fig. 64-20) and the threads of the pitch change slider (23) with cleaner (C572). 64-31-01 Rev. 6 6411 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 31 of 38 ### Page 32 (OCR) ANNEX B * LEONARDO HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 Apply the primer (C594) or (C126) on the threads of the ring nut (17) and the threads of the pitch change slider (23). (s) Apply on the ring nut (17), at approximately half the length of the thread, four drops of sealing compound (C029) equally spaced. (t) Install the ring nut (17) with tool (LSE NO 66). (u) Torque the ring nut (17) to 500 - 600 kgcm. (v) Install a new lock ring (16) on the ring nut (17). Make sure the two clawed tabs of the lock ring are cor- rectly engaged. (5a) Connect lever (40) and links (10) to housing (15). Torque nuts to 3,4-4,5 Nm, then install cotter pins. NOTE 1: It is possible to install the shims (65) between housing (15) and links (10) and shims (66) between lever (40) and housing (15). The washers must have the following dimensions: internal diameter 12 mm, external diam- eter 24 mm, thickness 0,5 - 0,6 mm. NOTE 2: Install the two larger washers against spherical bearing of lever (40) and link (10). Install the two smaller washers between the larger one and the nut. To obtain proper torque replacement of one smaller washer AN960C416 with an AN960C416L washer is permitted. NOTE 3: If during installation the gap between lever (40) and sleeve (15) is more than 0,3 mm, install an AN960C416L washer: (6) Put the connecting link (46) in position on the lever (40) and the fitting (61). (7) Put the four washers (63) and the two shims (64) in their position between the connecting link (46), the lever (40) and the fitting (61). (8) Apply anti seize compound (C1 79) to the stem of bolt (58), then secure the connecting link to fitting (61) using the bolt (58), washers (57, 56) and nut (55) (9) Measure clearance between the link (46) and the fitting (61); if the clearance is more than 0.05 mm (0.002 in), adjust thickness of shim (64). (10) Torque nut (55) to 3.4 to 4.5 Nm and install the cotter pin. (11) Apply anti seize compound (C179) to the stem of bolt (44), then secure the connecting link to lever (40) using the bolt (44), washers (42, 43) and nut (41); (12) Measure clearance between the link (46) and the lever (40); if the clearance is more than 0.05 mm (0.002 in), adjust thickness of shim (64). (13) Torque nut (41) to 3.4 to 4.5 Nm and install the cotter pin. NOTE: Shims (64) can be installed on the top side or either on the bottom side of link (46). (14) Install the group on 90° gearbox output shaft. Lockwire boot (30) with safety wire (C013). (15) Connect links (10) to levers (5 and 49). Verify that bolts can turn and slide freely in seats, otherwise reposition lever (49) and/or lever (5) until this requirement is satisfied. Torque nuts to 3,4-4,5 Nm and fit cotter pins. NOTE: Install larger washer under bolt head and smaller washer under nut. (16) Torque nuts (3 and 51) to 5,7-7,9 Nm. 64-31-01 64-12 Rev. 5 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 32 of 38 REVISION: / ### Page 33 (OCR) E LEONARDO ANNEX B HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 C. Remove the two bolts (14) until their head touch the tail rotor drive shaft. D. Disconnect the two links (10) from the lever (40). E. Disconnect the link (46) from the lever (40) by removing attaching parts. Discard the cotter pins. F. Move the link (40) away from the lever (40) until the lever can turn freely. G. Inspect the shank of the two bolts (14) for wear, fretting, dents and scratches. Presence of any of the above damage is cause for bolts replacement. Refer to para 64-31-6. H. Hold the sliding assy (23) and turn the housing (15) with the lever (40) by hands. I. Make sure the duplex bearing (18) turns freely and smoothly (without any roughness or abnormal friction). J. If the duplex bearing (18) does not turn freely and smoothly, replace the bearing (18). Refer to para 64-31-6. K. If the duplex bearing (18) turns freely and smoothly, connect the link (46) and the two links (10) to the pitch control lever (40) and the housing (15). Refer to para 64-31-6-C. L. Put the boot (39) in its position. 64-31-10. Special inspection (off aircraft) - duplex bearing P/N 109-0133-05-101 (Fig 64-20 and 64-22) A. Inspect the duplex bearing (18) (Fig 64-20) for freedom of rotation. Refer to para 64-31-9. B. If the duplex bearing (18) does not turn freely and smoothly, replace the bearing (18). Refer to para 64-31-6. C. If the duplex bearing (18) turns freely and smoothly do as follows: (1) Remove the duplex bearing (1) (fig 64-22) P/N 109-0133-05-101. Refer to para 64-31-6. NOTE: The duplex bearing (1) includes two ball bearings (2). (2) Remove the external retaining ring (4), the boot (3) and the internal retaining ring (5) from the two bearings (2). NOTE: If during the cleaning, inspection and greasing operations the balls of a bearing (2) come out, discard the duplex bearing (1). The installation of the balls into the bearing is not permitted. (3) Clean the two bearings (2) with cleaning solvent (C287) and a soft bristle brush. Use the ultrasonic cleaning • equipment, if available. (4) Dry the two bearings with filtered dry compressed air. NOTE: Do not spin dry bearings. (5) Inspect the two bearings (2) for damage. Refer to para 64-31-8 G. (6) Install the internal retaining ring (5), the boot (3) and the external retaining ring (4) on the two bearings (2). (7) Lubricate the two bearings (2). Refer to Para 12-20-8A. (8) Install the duplex bearing (1) P/N 109-0133-05-101. Refer to Para 64-31-6. 64-31-01 Rev. 3 64-15 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 33 of 38 ### Page 34 (OCR) K LEONARDO ANNEX B HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 1. Housing and slider group 16. Housing group 2. Slider 17. Barrel (Part of the LSE NO 73) 3. Ring nut 18. Bushing (Part of LSE NO 73) 4. Douplex bearing 19. Pin (Part of LSE NO 73) 5. Housing 20. Housing-slider assembly 6. Nut 21. Wrench (Part of LSE NO 66) 7. Lock ring 22. Base (Part of LSE NO 66) 8. Bearing 23. Brace 9. Bearing 24. Pin 10. Base (Part of LSE NO 71) 11. Pin (Part of LSE NO 71) 12. Housing-bearing assembly 13. Bolt (Part of LSE NO 67) 14. Base (Part of LSE NO 67) 15. Wrench (Part of LSE NO 67) EXTERNA /-MARK (REF VIERNA BORE SIDE V-MARK (REF V.NTER (REF) INTERNAL BOOT SIDE SIDE (REF) A6ID223B Figure 64-21 (sheet 1 of 5). Housing and slider assembly 64-31-01 64-16 Rev. 6 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 34 of 38 REVISION: / ### Page 35 (OCR) · LEONARDO ANNEX B HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 A6ID335A Figure 64-21 (sheet 2 of 5). Housing and slider assembly 64-31-01 Rev. 6 64-17 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 35 of 38 ### Page 36 (OCR) * LEONARDO ANNEX B HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 B1 HOUSE BEARING ASSY SAFETY WIRE - SAFETY WIRE RING NUT SAFETY WIRING SCHEME OF RING NUT A6ID336A Figure 64-21 (sheet 3 of 5). Housing and slider assembly 64-31-01 64-18 Rev. 6 S.B. N°109K-076 ALERT DATE: March 21, 2023 Page 36 of 38 REVISION: / ### Page 37 (OCR) ANNEX B K LEONARDO HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 20 18 A6ID337A Figure 64-21 (sheet 4 of 5). Housing and slider assembly 64-31-01 Rev. 6 64-19 S.B. N°109K-076 ALERT DATE: March 21, 2023 REVISION: / Page 37 of 38 ### Page 38 (OCR) ANNEX B ≤ LEONARDO HELICOPTERS A109K2-MM S/N 10001 through S/N 10015 and S/N 10027 E 20 23 24 ROTATION SENSE 23. - 7Z Figure 64-21 (sheet 5 of 5). Housing and slider assembly 64-31-01 64-20 Page 38 of 38 ### Page 39 Remarks: Information: SERVICE BULLETIN COMPLIANCE FORM Date: Number: Revision: Please send to the following address: Telephone: Fax: B.T. Compliance Date: Customer Name and Address: Helicopter Model S/N Total Number Total Hours T.S.O. LEONARDO S.p.A. CUSTOMER SUPPORT & SERVICES - ITALY PRODUCT SUPPORT ENGINEERING & LICENSES DEPT. Via Giovanni Agusta, 520 21017 Cascina Costa di Samarate (VA) - ITALY Tel.: +39 0331 225036 Fax: +39 0331 225988 We request your cooperation in filling this form, in order to keep out statistical data relevant to aircraft configuration up-to-date. The form should be filled in all its parts and sent to the above address or you can communicate the application also via Technical Bulletin Application Communication Section placed in Leonardo AW Customer Portal - MyCommunications Area. We thank you beforehand for the information given. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.