AD 2011-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. Model AB139 and AW139 | Airworthiness Directives; Agusta S.p.A. Model AB139 and AW139 Helicopters |
Unsafe Condition
Debonding of tailboom panels, which could lead to failure of the tailboom and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a daily check of each tailboom panel for outer skin bulging or deformation. If bulging or deformation is detected, a mechanic must tap inspect the area for debonding. If debonding exceeds acceptable limits, install tailboom structural reinforcement MOD, P/N 3G5309P01812. If debonding is within acceptable limits, repair the tailboom before further flight. Tap inspect tailboom panels for debonding at 25-hour and 50-hour TIS intervals, depending on tail assembly configuration and serial numbers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the specified intervals (daily, 25-hour TIS, or 50-hour TIS), depending on the action required.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Agusta S.p.A. Model AB139 and AW139 helicopters with tailboom assemblies that have not been modified according to MOD, P/N 3G5309P01812.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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