AD 2012-17-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Various Restricted Category Helicopters |
| aircraft | Bell | Helicopter Textron | Airworthiness Directives; Various Restricted Category Helicopters |
Unsafe Condition
Fatigue cracks on main rotor (M/R) blades installed on Bell Helicopter Textron, Inc. (Bell) Model 212 helicopters, specifically in the lower skin, doublers, and box beam at the M/R blade attachment bolt hole, and through the lower grip plate at blade station (BS) 36. These cracks could lead to loss of the M/R blade 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
Within 25 hours time-in-service (TIS), and thereafter at intervals not to exceed 25 hours TIS, wash the upper and lower M/R blade surfaces, visually inspect the upper and lower grip plates, doublers, and remaining surfaces of the M/R blade between blade stations 24.5 and 40 for an edge void, corrosion, or crack. Inspect bond lines with a magnifying glass and bright light for edge delamination or cracks in the paint finish. Remove paint from areas with edge delamination or cracks to check for underlying edge voids or cracks. Replace or repair M/R blades with edge voids, corrosion, or cracks as specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service (TIS), and thereafter at intervals not to exceed 25 hours TIS.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Various restricted category helicopters including Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P with certain main rotor (M/R) blade assemblies installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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