Safety Publications Tool
2021-0121 : Main Rotor Drive – Main Gearbox Bearing Lock Nut – Replacement
EASA approval number
EASA VTOL Department
/ Type Designation
LEONARDO S.p.A. HELICOPTERS
This AD supersedes EASA AD 2020-0011R1 dated 20 November 2020.
Publication(s) and related information
Leonardo S.p.A. Helicopters ASB 139-609 original issue dated 18 December 2019, or Revision A dated 13 April 2021. Leonardo S.p.A. Helicopters ASB 139-567 original issue dated 14 February 2019, or Revision A dated 05 July 2019, or Revision B dated 18 October 2019. The use of later approved revisions of the above-mentioned documents is acceptable for compliance with the requirements of this AD.
1. If requested and appropriately substantiated, EASA can approve Alternative Methods of Compliance for this AD. 2. Based on the required actions and the compliance time, EASA have decided to issue a Final AD with Request for Comments, postponing the public consultation process until after publication. 3. Enquiries regarding this AD should be referred to the EASA Safety Information Section, Certification Directorate. E-mail: ADs[at]easa.europa.eu. 4. Information about any failures, malfunctions, defects or other occurrences, which may be similar to the unsafe condition addressed by this AD, and which may occur, or have occurred on a product, part or appliance not affected by this AD, can be reported to the EU aviation safety reporting system. This may include reporting on the same or similar components, other than those covered by the design to which this AD applies, if the same unsafe condition can exist or may develop on an aircraft with those components installed. Such components may be installed under an FAA Parts Manufacturer Approval (PMA), Supplemental Type Certificate (STC) or other modification.
EASA_AD_2021_0121.pdf (239 kb)
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