AD 2006-17-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. Model AB139 | Airworthiness Directives; Agusta S.p.A. Model AB139 Helicopters |
Unsafe Condition
Cracks in the tailpipe assembly and overheating of the structure in the cowling area, which could lead to separation of a part of the tailpipe assembly and subsequent loss of control of the helicopter.
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Required Actions
Before further flight, visually inspect each tailpipe assembly inside the cowling for cracks and inspect the surrounding structure for overheating. If overheating is found, inspect for damage to the surrounding structure. If a crack is found, replace the tailpipe assembly with an airworthy one. Repeat inspections at intervals not exceeding 25 hours time-in-service.
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Compliance Time
Before further flight
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Affected Aircraft
Agusta S.p.A. Model AB139 helicopters of U.S. registry.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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