Airworthiness directives › 2025-04-09
AD 2025-04-09 Airworthiness Directives; Airbus Helicopters
Models named: EC 155B, EC155B1, SA-365N, SA-365N1, AS-365N2, AS 365 N3. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Airbus Helicopters Model EC 155B, EC155B1, SA-365N, SA-365N1, AS-365N2, and AS 365 N3 helicopters, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as specified in paragraphs (h) and (i) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, European Union Aviation Safety Agency (EASA) AD 2022-0231, dated November 28, 2022 (EASA AD 2022-0231).
Unsafe condition
This AD was prompted by an engine compartment fire where the upper stiffener of the central firewall, made of aluminum, in the engine compartment was found damaged. The FAA is issuing this AD to address failure of a central firewall stiffener made of aluminum, possibly due to its inability to withstand high temperatures of an engine fire and subsequently not seal the engine compartment properly. In the event of an engine fire, the unsafe condition, if not addressed, could result in fire propagating from one engine compartment to the other and subsequent loss of control of the helicopter.
Affected ADs
None.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1