AD 2017-18-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Beechcraft Corporation | Various | Airworthiness Directives; Textron Aviation Inc. Airplanes |
| aircraft | Textron | Aviation Inc | Airworthiness Directives; Textron Aviation Inc. Airplanes |
| aircraft | Beechcraft | Various | Airworthiness Directives; Textron Aviation Inc. Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Textron Aviation Inc. Airplanes |
Unsafe Condition
Reports of hydraulic fluid loss from the engine driven pumps (EDPs) on three different airplanes. Excessive pitting in the aluminum port caps of one manufacturing lot of EDPs could cause multiple-origin fatigue cracking of the port caps, leading to flammable hydraulic fluid leakage into the engine compartment and loss of all normal hydraulic functions.
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Required Actions
Inspect to determine if an affected EDP is installed. Replace the EDP as necessary based on the inspection results.
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Compliance Time
Before further flight
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Affected Aircraft
Textron Aviation Inc. Model 390 airplanes, serial numbers RB-4 through RB-295, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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