AD 2017-26-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The | Enstrom Helicopter Corporation | Airworthiness Directives; The Enstrom Helicopter Corporation Helicopters |
Unsafe Condition
Failure of a rod end bearing assembly may result in the loss of a main rotor blade.
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Required Actions
Inspecting each main rotor hydraulic damper bearing assembly P/N ECD091-1, and for model F-28, F-28A, F-28C, F-28C-2, F-28C-2R, F-28F, F-28F-R, 280, 280C, 280F, and 280FX helicopters each belt tension shaft bearing assembly P/N 01-824-08E-011, 09455-01-824-08E-011, ASMK8T, ECD091-1, MTK8, M81935/1-08K, and MS21242S8K, for corrosion at the root of the thread on the rod end with a 5X or higher power magnifying glass. If there is any corrosion, replace the bearing assembly before further flight. Reporting the findings of the inspection to the FAA's Chicago ACO Branch, including: The owner's contact information, helicopter registration number and model, date of the inspection, total hours of the bearing assembly and helicopter, bearing assembly serial number, the location of any corrosion, and a description of any corrosion.
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Compliance Time
Within 5 hours time-in-service (TIS)
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Affected Aircraft
Enstrom Model F-28, F-28A, F-28C, F-28C-2, F-28C-2R, F-28F, F-28F-R, TH-28, 280, 280C, 280F, 280FX, 480, and 480B helicopters with a rod end bearing assembly part number (P/N) 01-824-08E-011, 09455-01-824-08E-011, ECD091-1, ASMK8T, M81935/1-08K, MS21242S8K, or MTK8 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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