AD 2017-09-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Cracking of the front spar web inboard of pylon number 2 between front spar station inboard (FSSI) 655.75 and FSSI 660, which could lead to fuel leaks and a consequent fire.
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Required Actions
Conduct repetitive detailed, ultrasonic, and high frequency eddy current inspections for cracking of the front spar web between FSSI 628 and FSSI 713. Repair any cracking found during inspections.
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Compliance Time
Within 6 months of the effective date of the AD.
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Affected Aircraft
The Boeing Company Model 747-400, 747-400D, and 747-400F airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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