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AD 2025-13715

Published 2025-07-22 · 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 365 N3, EC 155B, and EC155B1 helicopters. This AD was prompted by reports of false engine fire warnings. This AD requires replacing affected engine fire detectors and prohibits installing an affected engine fire detector or an engine that contains an affected engine fire detector. 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 34352. View on Federal Register ↗

[Federal Register Volume 90, Number 138 (Tuesday, July 22, 2025)] [Rules and Regulations] [Pages 34352-34353] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 2025-13715]

[[Page 34352]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2025-0625; Project Identifier MCAI-2022-01625-R; Amendment 39-23085; AD 2025-14-07] 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 365 N3, EC 155B, and EC155B1 helicopters. This AD was prompted by reports of false engine fire warnings. This AD requires replacing affected engine fire detectors and prohibits installing an affected engine fire detector or an engine that contains an affected engine fire detector. The FAA is issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective August 26, 2025. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of August 26, 2025.