AD 2017-14-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer Aircraft Corporation | Various | Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters (Type Certificate Previously Held by Schweizer Aircraft Corporation) |
| aircraft | Sikorsky | Aircraft Corporation | Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters (Type Certificate Previously Held by Schweizer Aircraft Corporation) |
Unsafe Condition
Reports of accidents due to driveshaft failures indicate an unsafe condition involving corrosion, pits, nicks, scratches, dents, and cracks in the driveshaft.
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Required Actions
Visually inspect the driveshaft within 25 hours time-in-service (TIS) and thereafter at intervals not to exceed 150 hours TIS. If no cracks, corrosion, or other damage are found, perform a magnetic particle inspection. Replace the driveshaft before further flight if any damage is detected. Install tachometer markings if not previously performed.
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Compliance Time
Within 25 hours time-in-service (TIS)
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Affected Aircraft
Sikorsky Aircraft Corporation (formerly Schweizer Aircraft Corporation) Model TH55A, 269A, 269A-1, 269B, 269C, and 269C-1 helicopters with applicable driveshafts installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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