# Leonardo Mandatory Bollettino Tecnico 109K-72: No revision named - Rights: © Leonardo S.p.A. Filed by the FAA in regulations.gov docket FAA-2018-0170; AD 2018-07-08 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Leonardo Mandatory Bollettino Tecnico 109K-72](https://openairdocs.org/service-documents/leonardo/109k-72.md) - Title as filed: Leonardo Helicopters BT 109K-72 - Pages: 7 - PDF: https://openairdocs.org/files/sha256/d4/da/d4da64d01ac64329354947353fac297293171921586c68c40d75b5704de329b4 - Page: https://openairdocs.org/service-documents/leonardo/109k-72/file/d4da64d01ac6 ## Text Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 TRANSLATION OF BOLLETTINO TECNICO The technical content of this document is approved under the authority of DOA nr EASA.21J.005. N° 109K-72 DATE August 19th, 2016 REV. xxxxxxx Compliance with this bollettino is: Page 1 of 6 SUBJECT: TAIL ROTOR BLADE RETENTION BOLT P/N 709-0160-57-101. REASON: PART I^: Reduce the Retirement Life of the bolt P/N 709-0160 -57-101. PA RT II^: Perform a periodic visual inspection with a 10 power magnification lens and reduce the Retirement Life of the bolt P/N 709-0160-57-101. HELICOPTERS AFFECTED: PART I^: All the A109K2 helicopters that install bolt P/N 709 -0160-57-101 which has accumulated more or equal than 8 00 (eight-hundred) flight hours at receipt of this Bollettino. PART II^: All the A109K2 helicopters that install bolt P/N 709 -0160-57-101 which has accumulated less than 8 00 (eight-hundred) flight hours at receipt of this Bollettino. COMPLIANCE: PART I^: Within and not later than 25 (twenty-five) flight hours from the receipt of this Bollettino. PART II^: Within and not later than 25 (twenty-five) flight hours from the receipt of this Bollettino and subsequently every 2 00 (two-hundred) flight hours until the achievement of 8 00 (eight-hundred) flight hours to the bolt P/N 709-0160- 57-101. MANDATORY 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 ### Page 2 B.T.109K-72 Page 2 of 6 DESCRIPTION: On an in-service A109 series helicopter, a crack of the tail rotor blade retention bolt P/N 709- 0160-57-101 has occurred, with no effect to the helicopter mission completion. The crack was afterward detected during the pre-flight inspection. Based on the current investigation results there is no clear evidence of manufacturing defects, or external damages on the component to consider it non-conforming to the built spec. Therefore, based on this single event and waiting for the conclusion of the investigation as a precautionary measure to guarantee the continuous airworthiness of the helicopters, this Bollettino is issued to provide the necessary instructions to:  Reduce the retirement life of the bolt P/N 709-0160-57-101 (PART I^);  Perform a periodic visual inspection with a 10 power magnification lens to the bolt P/N 709- 0160-57-101 until the achievement of 800 (eight- hundred) flight hours and reduce the retirement life (PART II^). REQUIRED MANPOWER: The following estimated manpower hours are required for compliance with this Bollettino: PART I^: 4 m/h; PART II^: 4 m/h; WARRANTY: Owners/Operators who comply with the instructions of this Bulletin, no later than the applicable date in the “Compliance section” will be eligible to receive REQUIRED MATERIALS on free of charge basis, except for Consumable Materials. NOTE: Customers who fail to comply with the instructions in this bulletin before the compliance date are not eligible for the aforementioned special policy. Please Issue relevant M.M.I.R. form ( (M)aintenance (M)alfunction (I)nformation (R)eport ) to your Warranty Administration Dpt. REQUIRED MATERIALS: NOTE Bolt P/N 709-0160-47-101 and bolt P/N 709- 0160-57-101 can be mixed. The following material is required for compliance with PART I^ of this Bollettino: P/N DENOMINATION Q.TY 709-0160-47-101 or bolt A.R. 709-0160-57-101 ### Page 3 B.T.109K-72 Page 3 of 6 The following material may be required for compliance with PART II^ of this Bollettino: NOTE In case a replacement bolt is required to comply with Part II^ of this Bollettino, please contact aw109.mbx.aw@leonardocompany. com to obtain information on how to handle the damaged part for investigation” P/N DENOMINATION Q.TY 709-0160-47-101 or bolt A.R. 709-0160-57-101 In addition the following consumable material is required for compliance with PART II^ of this Bollettino:  Solvent (hexane or petroleum ether or aliphatic naphtha according to TT-N-95 type 2). SPECIAL TOOLS: PART I^: N.A.; PART II^: 10 power magnification lens. WEIGHT AND BALANCE CHANGES: N. A. REFERENCES: A109K2 Maintenance Manual. PUBLICATIONS AFFECTED: A109K2 Maintenance Planning Manual. COMPLIANCE INSTRUCTIONS: PART I^: 1. Prepare the helicopter on ground for a safe maintenance, disconnect any power supply, in accordance with the instructions given in the A109K2 Maintenance Manual chapter 00 . 2. Remove and discard the bolt P/N 709-0160- 57-101 in accordance with the instructions given in the A109K2 Maintenance Manual chapter 64 ( section 64A-11). ### Page 4 B.T.109K-72 Page 4 of 6 3. Install a bolt P/N 709- 0160-57-101 or P/N 709-0160-47- 101 in accordance with the instructions given in the A109K2 Maintenance Manual chapter 64 ( section 64A-11). NOTE Bolt P/N 709-0160-47-101 and bolt P/N 709- 0160-57-101 can be mixed. 4. Return the helicopter to a ready to flight condition. NOTE The Retirement Life of bolt P/N 709-0160-57-101 is reduced to 800 flight hours by this Bollettino. Bolt P/N 709- 0160-47-101 is not affected by the retirement life reduction and inspections required by this Bollettino Tecnico. 5. Record compliance with the PART I^ of this Bollettino in the helicopter log book. 6. Send the attached compliance form to the following email box: aw109.mbx.aw@leonardocompany.com. As an alternative, gain acces to My Comunications section on Leonardo Web Portal on AW website and compile the “Technical Bulletin Application Comunication”. PART II^: 1. Prepare the helicopter on ground for a safe maintenance, disconnect any power supply, in accordance with the instructions given in the A109K2 Maintenance Manual chapter 00 . 2. Remove the bolt P/N 709-0160- 57-101 in accordance with the instructions given in the A109K2 Maintenance Manual chapter 64 (section 64A-11). 3. Using a 10 power magnification lens, visually inspect for cracks the bolt area shown in figure 1 without cleaning the part before the inspection. 4. Thoroughly clean and degrease the part with special attention to the inspection area (figure 1) using a cloth soaked in solvent. 5. Repeat inspection prescribed in above step 3. ### Page 5 B.T.109K-72 Page 5 of 6 NOTE Presence of longitudinal marks is not an indication of cracks. Refer to the A109K2 Maintenance Manual chapter 64 (section 64A- 11) for the acceptance limits. 6. If cracks are found discard the bolt P/N 709-0160- 57-101 and replace it with an airworthy bolt P/N 709- 0160-57-101 or a bolt P/N 709-0160-47-101. Apply point 8. and subsequent. 7. If no cracks are found, re-install the bolt P/N 709-0160- 57-101 in accordance with the instructions given in the A109K2 Maintenance Manual chapter 64 ( section 64A-11). Apply point 8. and subsequent. 8. Install the bolt P/N 709- 0160-57-101 or P/N 709-0160-47-101 in accordance with the instructions given in the A109K2 Maintenance Manual chapter 64 ( section 64A-11). NOTE Bolt P/N 709-0160-47-101 and bolt P/N 709- 0160-57-101 can be mixed. 9. Return the helicopter to a ready to flight condition. NOTE The Retirement Life of bolt P/N 709-0160-57-101 is reduced to 800 flight hours by this Bollettino. Bolt P/N 709- 0160-47-101 is not affected by the retirement life reduction and inspections required by this Bollettino Tecnico. 10. Record compliance with the PART II^ of this Bollettino in the helicopter log book. 11. Send the attached compliance form to the following email box: aw109.mbx.aw@leonardocompany.com. As an alternative, gain acces to My Comunications section on Leonardo Web Portal on AW website and compile the “Technical Bulletin Application Comunication”. ### Page 6 B.T.109K-72 Page 6 of 6 BOLT P/N 709-0160-57-101 FIGURE 1 for reference only INSPECTION AREA ### Page 7 Remarks: Information: BOLLETTINO TECNICO 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.