AD 2013-13-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Robinson | Air Crane | Airworthiness Directives; Various Restricted Category Helicopters |
| aircraft | Textron | Various | Airworthiness Directives; Various Restricted Category Helicopters |
| aircraft | Bell | Various | Airworthiness Directives; Various Restricted Category Helicopters |
| aircraft | Aviat | Various | Airworthiness Directives; Various Restricted Category Helicopters |
Unsafe Condition
Cracks originating in the lower main rotor blade bolt lug, attributed to subsurface fatigue, corrosion, and mechanical damage, leading to grip failure and potential main rotor blade separation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Create a component history card or equivalent record for each main rotor grip. Determine and record the total hours time-in-service (TIS) for each grip. Visually inspect the upper and lower tangs of the grip for cracks. Inspect grip buffer pads for delamination, and if present, inspect the grip surface for corrosion or other damage. Inspect the grip for cracks using ultrasonic (UT) and fluorescent penetrant inspection methods. Establish a retirement life for certain grips.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Arrow Falcon Exporters, Inc., Firefly Aviation Helicopter Services, California Department of Forestry, Garlick Helicopters, Inc., Global Helicopter Technology, Inc., Hagglund Helicopters, LLC, International Helicopters, Inc., Precision Helicopters, LLC, Robinson Air Crane, Inc., San Joaquin Helicopters, S.M.&T. Aircraft, Smith Helicopters, Southern Helicopter, Inc., Southwest Florida Aviation International, Inc., Tamarack Helicopters, Inc., US Helicopter, Inc., West Coast Fabrication, and Williams Helicopter Corporation Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P Helicopters; and Southwest Florida Aviation Model UH-1B (SW204 and SW204HP) and UH-1H (SW205) Helicopters with certain grips 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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