AD 2026-05-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model AS355E | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
Failure of the engine combustion chamber drain valve can cause hot air leakage, leading to hose failure in the rear cargo compartment, which could result in an uncontrolled fire and reduced helicopter control.
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Required Actions
Inspect each engine drain valve and affected rear cargo compartment hoses, install thermal papers on drain pipes, and perform repetitive inspections. Depending on inspection results, take corrective actions such as installing silicone tape, replacing hoses or drain pipes, and revising thermal paper.
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Compliance Time
Within 12 months of the effective date
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Affected Aircraft
Airbus Helicopters Model AS355E, AS355F, AS355F1, AS355F2, AS355N, and AS355NP helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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