MD HELICOPTERS 600N Service Bulletins

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MANDATORY MANDATORY MANDATORY MANDATORY MANDATORY MANDATORY SERVICE BULLETIN Copyright 1999-2020 by MD Helicopters, Inc. This document may be reproduced and distributed provided no fee is charged, the text is not modified, and this copyright notice is included. * Supersedes Service Bulletins SB369H-263R1, SB369D-229R1, SB369E-129R1, SB369F-119R1, SB500N-066R1, and SB600N-080R1, dated 15 May 2020. Revised to delete compliance Method 2 and to add a reoccurring 300-hour borescope inspection of the pilot-to-copilot tail rotor torque tube. * Helicopters that are in compliance with SB369H-263, SB369D-229, SB369E-129, SB369F-119, SB500N-066, and SB600N-080, dated 30 January 2020, must add a reoccurring 300-hour borescope inspection of the pilot-to-copilot tail rotor torque tube. * Helicopters that are in compliance with SB369H-262, SB369D-228, SB369E-128, SB369F-118, SB500N-065, and SB600N-079 must add a 300-hour borescope inspection of the pilot-to-copilot tail rotor torque tube. INSPECTION OF THE PILOT−TO−COPILOT TAIL ROTOR TORQUE TUBE 1. PLANNING INFORMATION A. Aircraft Affected: All 369H, 369HE, 369HS, and 369HM helicopters All 369D helicopters All 369E helicopters All 369F/FF helicopters All 500N helicopters All 600N helicopters B. Assembly/Components Affected By This Notice: 369H7531-9/-11/-13 Pilot-to-Copilot Tail Rotor Torque Tube C. Reason: MDHI has received a 369H7531 pilot-to-copilot tail rotor torque tube with a significant spiral crack that seems to have originated from a hole where the tail rotor torque tube control fitting attaches to the torque tube. The crack caused reduced directional control pedal authority. Failure to comply with this bulletin can cause a loss of anti-torque authority and directional control. D. Description: Procedures in this bulletin give owners and operators information to do a reoccurring inspection of the tail rotor torque tube for cracks and defects. E. Time of Compliance: For helicopters with 600 flight hours or less: the Accomplishment Instructions (ref. Procedure 2.A.) in this bulletin must be completed during the next 100-hour inspection and every 300-hour inspection thereafter. For helicopters with more than 600 flight hours: the Accomplishment Instructions (ref. Procedure 2.A.) must be completed after a maximum of 5 hours of flight time. During these 5 flight hours, flights with increased, excessive, or rapid pedal movements must be limited. Perform (ref. Procedure 2.A.) the 300-hour inspection thereafter. SB369H-263R2* SB369D-229R2* SB369E-129R2* SB369F-119R2* SB500N-066R2* SB600N-080R2* DATE: 24 MARCH 2021 PAGE 1 OF 6 MANDATORY MANDATORY MANDATORY MANDATORY MANDATORY MANDATORY SERVICE BULLETIN Copyright 1999-2020 by MD Helicopters, Inc. This document may be reproduced and distributed provided no fee is charged, the text is not modified, and this copyright notice is included. F. FAA Approval: The technical design aspects of this bulletin are FAA-approved. G. Manpower: Compliance with this bulletin will be approximately one (1) man-hour. H. Interchangeability: None. I. Points of Contact: For further assistance, contact MDHI Field Service at: https://www.mdhelicopters.com/contact.html J. Material/Part Availability: Contact MDHI Spare Sales for parts availability at: https://www.mdhelicopters.com/contact.html REPLACEMENT PARTS/SUPPLIES Nomenclature Part No. Qty. Source Pilot−to−Copilot Tail Rotor Torque Tube 369H7531−9/−11/−13 1 MDHI K. Warranty Policy: Contact MDHI Warranty for prices, orders, availability, and service at: https://www.mdhelicopters.com/contact.html. Standard warranty policy applies. Additional discrepancies found over and above the specified warranty coverage is the responsibility of the customer. L. Disposition of Parts Removed: Return the removed part to an authorized service center or MDHI with a completed Service Operation Report (SOR). Fill out a Service and Operations Report (SOR) at https://www.mymd.aero/dashboard (select the SUPPORT dropdown menu, and then select New SOR). M. Tooling: Contact MDHI Spares Sales for parts availability at: https://www.mdhelicopters.com/contact.html. TOOLS AND EQUIPMENT Nomenclature (Item) Source (Manufacturer / Supplier) Borescope Commercially Available SB369H-263R2* SB369D-229R2* SB369E-129R2* SB369F-119R2* SB500N-066R2* SB600N-080R2* DATE: 24 MARCH 2021 PAGE 2 OF 6 MANDATORY MANDATORY MANDATORY MANDATORY MANDATORY MANDATORY SERVICE BULLETIN Copyright 1999-2020 by MD Helicopters, Inc. This document may be reproduced and distributed provided no fee is charged, the text is not modified, and this copyright notice is included. N. Weight and Balance: N/A O. Electrical Load Data: N/A P. Other Publications Affected: N/A Q. Reference Publications: Refer to the latest revision of these publications for procedures and additional information: Civil Aviation Authority of New Zealand Continuing Airworthiness Notice (CAN) 27-014 CSP-H-2 Basic Handbook of Maintenance Instructions CSP-H-7 Illustrated Parts Catalog CSP-HMI-2 Basic Handbook of Maintenance Instructions – Servicing and Maintenance CSP-IPC-4 Illustrated Parts Catalog 2. ACCOMPLISHMENT INSTRUCTIONS The left-hand command installation is shown. The procedures for the right-hand command are the same. A. Borescope Inspection of the Pilot-to-Copilot Tail Rotor Torque Tube (Ref. Figure 1) (1). Get access to the inspection area, as necessary. (2). Examine the exterior of torque tube (1) with a bright light and a mirror for cracks, elongation, and other damage. Remove panels and components as necessary to get access. (Ref. CSP-HMI-2) (3). Examine the interior of torque tube (1) with a borescope for cracks, elongation, and other damage. (a). Fully examine the area around the interface of torque tube (1) and bushing seg ments (4). (b). Replace a torque tube with cracks, elongation, or damage. (Ref. CSP-HMI-2, 67-20-10, Removal / Installation, procedures 5. or 6.)