AD 2011-21-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Erickson | Air-Crane Incorporated Model S-64F | Airworthiness Directives; Erickson Air-Crane Incorporated Model S-64F Helicopters |
Unsafe Condition
Loss of a swashplate due to a fatigue crack, leading to loss of control of the main rotor system and subsequent loss of control of the helicopter.
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Required Actions
Inspect the swashplate for cracks at specified intervals using visual inspection, magnifying glass, and fluorescent-penetrant inspection (FPI). Replace the swashplate with an airworthy one if a crack is found before further flight.
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Compliance Time
Within 15 hours time-in-service (TIS) for initial visual inspection, 150 hours TIS for magnifying glass inspection, and 1,000 hours TIS for FPI.
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Affected Aircraft
Erickson Air-Crane Incorporated Model S-64F helicopters with rotating swashplate assembly (part number 65104-11001-051) installed, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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