Is AD 2025-04-09 a recurring Airworthiness Directive?

No — AD 2025-04-09 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2025-04-09

Q: Which aircraft does AD 2025-04-09 apply to?

AD 2025-04-09 applies to Airbus Helicopters — models EC 155B, EC155B1, SA-365N, SA-365N1, AS-365N2, AS 365 N3, EC155, SA-365. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2025-04-09 · FR doc 2025-03698 · 2025-03-07 · airframe

Airworthiness Directives; Airbus Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Model EC 155B, EC155B1, SA-365N, SA-365N1, AS-365N2, and AS 365 N3 helicopters. This AD prompted by an engine compartment fire where the upper stiffener of the central firewall in the engine compartment was found damaged. This AD requires replacing the aluminum central firewall stiffener with a titanium central firewall stiffener and prohibits installing an aluminum central firewall stiffener. These actions are specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2025-04-09 applies to

MakesAirbus Helicopters

ModelsEC 155B, EC155B1, SA-365N, SA-365N1, AS-365N2, AS 365 N3, EC155, SA-365, AS-365

Whether AD 2025-04-09 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.

Date — When the work was done.

Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.

Signature & certificate — The A&P/IA who returned it to service, with certificate number.

Is AD 2025-04-09 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.