AD 84-17-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76A Helicopters |
Unsafe Condition
Failure of the main rotor pitch horn, part number 76102-08011-042, due to fatigue or wear.
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Required Actions
Remove and replace the main rotor pitch horn with a new or airworthy part of the same part number, ensuring it has less than 5,500 hours time in service. Use the Sikorsky S-76A Maintenance Manual or FAA-approved equivalent. Special flight permits may be issued under FAR Sections 21.197 and 21.199.
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Compliance Time
Prior to further flight if the pitch horn has more than 5,500 hours time in service on the effective date (January 10, 1985), or before accumulating 5,500 hours time in service if it has 5,500 hours or less. Thereafter, comply every 5,500 hours time in service.
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A helicopters with main rotor pitch horn part number 76102-08011-042 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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