AD 74-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom Helicopter Corporation, The | F-28 | Airworthiness Directives; Enstrom Models F-28 and F-28A Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28A | Airworthiness Directives; Enstrom Models F-28 and F-28A Helicopters |
Unsafe Condition
Failure of the forged idler yoke (P/N 28-13223) due to cracks in the webbed area.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the webbed area of the forged idler yoke P/N 28-13223 by dye penetrant inspection before further flight and every 10 hours' time in service thereafter. Conduct a visual inspection as part of each pilot preflight inspection. Replace with cast idler yoke P/N 28-13299 if cracks are detected before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight and every 10 hours' time in service thereafter
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Affected Aircraft
Enstrom Helicopter Corporation models F-28 and F-28A helicopters with forged idler yoke P/N 28-13223
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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