AD 2025-04-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model EC 155B | Airworthiness Directives; Airbus Helicopters |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
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
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replacing aluminum central firewall stiffeners with titanium central firewall stiffeners and prohibit installing an aluminum central firewall stiffener
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Compliance Time
Within 7 work-hours and parts cost $1,737 to $2,801 depending on the part number for an estimated cost of $2,332 to $3,396 per helicopter and $81,620 to $118,860 for the U.S. fleet
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Affected Aircraft
Airbus Helicopters Model EC 155B, EC155B1, SA-365N, SA-365N1, AS-365N2, and AS 365 N3 helicopters
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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