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AD 2025-12873

Published 2025-07-10 · 1 model · 3 US-registered tails affected · Federal Register

Airworthiness Directives; Airbus Helicopters Federal Register ↗

Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Model AS-365N2, AS 365 N3, EC 155B, EC155B1, SA- 365N, and SA-365N1 helicopters. This AD was prompted by reports of loss of tightening torque between the upper ball bearing end and the main rotor (MR) servo-control. This AD requires inspecting the tightening torque and, depending on the results, taking corrective action. This AD also requires reporting information. The FAA is issuing this AD to address the unsafe condition on these products.

Applicability · by US fleet size

Federal Register text

Verbatim; the Federal Register publication is the legally binding document. Cite: 90 FR 30581. View on Federal Register ↗

[Federal Register Volume 90, Number 130 (Thursday, July 10, 2025)] [Rules and Regulations] [Pages 30581-30583] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 2025-12873]

[[Page 30581]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2025-0617; Project Identifier MCAI-2024-00331-R; Amendment 39-23075; AD 2025-13-09] RIN 2120-AA64

Airworthiness Directives; Airbus Helicopters

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Model AS-365N2, AS 365 N3, EC 155B, EC155B1, SA- 365N, and SA-365N1 helicopters. This AD was prompted by reports of loss of tightening torque between the upper ball bearing end and the main rotor (MR) servo-control. This AD requires inspecting the tightening torque and, depending on the results, taking corrective action. This AD also requires reporting information. The FAA is issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective August 14, 2025. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of August 14, 2025.