AD 79-02-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom Helicopter Corporation, The | 280C | Airworthiness Directives; Enstrom Model F-28C and 280C Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C | Airworthiness Directives; Enstrom Model F-28C and 280C Helicopters |
Unsafe Condition
Damage to the turbocharger and possible engine power loss due to insufficient torque on the bearing housing flange attachment screws and improper installation of the induction system components.
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Required Actions
Inspect the Rajay turbocharger and determine if its serial number is 70484 or greater. For turbochargers with serial numbers less than 70484, remove the turbocharger, torque the bearing housing flange attachment screws to 90 + 10 inch-pounds, stake the screws, reinstall the compressor housing with a new gasket, and reinstall the turbocharger. Additionally, remove the induction system air inlet filter, replace the AN815-6D union with an AN832-6D union, and reattach the fuel nozzle air vent line.
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Compliance Time
Within 50 hours time in service after the effective date of this AD
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Affected Aircraft
Enstrom Model F-28C and 280C helicopters certificated in all categories
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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