AD 2012-14-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Various | Restricted Category | Airworthiness Directives; Various Restricted Category Helicopters |
Unsafe Condition
A crack in the main rotor mast, which could result in failure of the mast 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
Overhaul the main rotor mast assembly and perform magnetic particle inspection on the mast, mast bearing nut, plate, mast and seal, and bearing liner for a crack. Fluorescent penetrant inspect the locking plate for a crack. Inspect the threaded area of the mast using a 10X or higher magnifying glass for pitting or corrosion. Replace the mast if a crack, pitting, or corrosion is found beyond surface rust that can be removed with a wire brush or steel wool.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 days
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Arrow Falcon Exporters, Inc. (AFE), Rotorcraft Development Corporation (formerly Garlick Helicopter Corporation, and Garlick Helicopter, Inc.), and San Joaquin Helicopters Model OH-58A, OH-58A+, and OH-58C helicopters, certificated in any category.
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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