AD 93-15-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom Helicopter Corporation, The | 280 | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F-28A, F-28C, F-28C2, F-28F, 280, 280C, 280F, and 280FX Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | 280C | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F-28A, F-28C, F-28C2, F-28F, 280, 280C, 280F, and 280FX Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | 280F | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F-28A, F-28C, F-28C2, F-28F, 280, 280C, 280F, and 280FX Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | 280FX | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F-28A, F-28C, F-28C2, F-28F, 280, 280C, 280F, and 280FX Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28A | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F-28A, F-28C, F-28C2, F-28F, 280, 280C, 280F, and 280FX Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F-28A, F-28C, F-28C2, F-28F, 280, 280C, 280F, and 280FX Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C-2 | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F-28A, F-28C, F-28C2, F-28F, 280, 280C, 280F, and 280FX Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28F | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F-28A, F-28C, F-28C2, F-28F, 280, 280C, 280F, and 280FX Helicopters |
Unsafe Condition
Failure of the main rotor shaft due to composite-wrapping separation, corrosion, red color residue, or cracks could result in loss of the main rotor and subsequent loss of control of the helicopter.
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Required Actions
Perform a one-time inspection of the shaft per Enstrom Service Directive Bulletin No. 0083. If composite-wrapping separation, corrosion, red residue, or cracks are found, remove the shaft and install P/N 28-13140-11 or P/N 28-13104-1. Replace the shaft with an airworthy part number if vibrations persist or track/balance is needed more than once. Replace P/N 28-13183 shaft within 10 hours' time-in-service or at the next annual inspection, whichever comes first.
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Compliance Time
Before further flight (for inspections and replacements due to issues found) or within the next 10 hours' time-in-service or at the next annual inspection after the effective date, whichever occurs first.
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Affected Aircraft
Enstrom Helicopter Corporation models F-28A, F-28C, F-28C2, F-28F, 280, 280C, 280F, and 280FX equipped with composite-wrapped main rotor shaft, part number 28-13183.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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