AD 85-25-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Erickson Air-Crane | S-64E | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-64E Helicopters |
Unsafe Condition
Cracked or corroded main rotor head torque tube inner bracket assembly, Part Number S1510-21332-0, could result in failure of the main rotor head assembly.
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Required Actions
Visually inspect the torque tube inner bracket assembly with a 10-power or higher magnifying glass for cracks and corrosion as per Sikorsky ASB 64B10-4A. Replace if cracked or corroded beyond limits; rework if corrosion is within limits. Ferry operations allowed under FAR 21.197/199.
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Compliance Time
Prior to the first flight of each day after the effective date (December 30, 1985). For cracked parts: replace prior to further flight. For corrosion: determine extent prior to further flight and replace or rework as needed.
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Affected Aircraft
Erickson Air-Crane Model S-64E helicopters, all serial numbers, certified in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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