AD 2017-02-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Cracking in the aluminum strut side skin and corrosion resistant steel (CRES) outer spring beam support fitting could result in the failure of the outer spring beam support fitting, which could cause separation of a strut and engine from the airplane during flight.
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Required Actions
Inspect for cracking in the strut side skin using repetitive high frequency eddy current (HFEC) inspections. Perform an open-hole HFEC inspection for cracking. Take applicable related investigative and corrective actions. Install fastener modifications as specified.
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Compliance Time
Within 500 flight cycles
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Affected Aircraft
The Boeing Company Model 747-200B, 747-300, 747-400, 747-400D, and 747-400F series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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