AD 98-17-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76A, B, and C Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-76B | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76A, B, and C Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-76C | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76A, B, and C Helicopters |
Unsafe Condition
Failure of the swashplate assembly, loss of control of the main rotor, and subsequent loss of control of the helicopter due to missing bolts or aluminum bolts installed on the swashplate assembly uniball bearing retainer.
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Required Actions
Conduct a one-time visual inspection of the swashplate assembly retainer for missing bolts and replace any missing bolts with airworthy AN3-5A bolts. Inspect each retainer bolt with a magnet to detect aluminum bolts, replacing any aluminum bolts with airworthy steel bolts one at a time.
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Compliance Time
Required before further flight, unless accomplished previously.
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A, B, and C helicopters, serial numbers prior to 760488, with swashplate assembly part numbers 76104-08000-044, -045, -046, or 76104-08500-041 or -043 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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