AD Amdt-39-9842
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Series Airplanes |
Unsafe Condition
Fatigue cracking, stress corrosion cracking, and fracturing of the lower horizontal clevis of the inboard midspar fitting on the number 3 strut, along with broken sealant common to the lower horizontal clevis of the inboard and outboard strut midspar fittings and fasteners. This could result in strut separation from the airplane.
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Required Actions
Inspect for broken sealant on the lower horizontal clevis of inboard and outboard strut midspar fittings and fasteners. Conduct ultrasonic inspections to detect cracking, corrosion, and fracturing of the upper horizontal clevis and detailed visual/borescope inspections for the lower horizontal clevis. Replace discrepant parts with new or serviceable parts or repair as necessary. Follow Boeing Alert Service Bulletin 747-54A2179 procedures.
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Compliance Time
Effective January 22, 1997
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Affected Aircraft
Boeing Model 747 series airplanes equipped with Pratt & Whitney JT9D, Rolls Royce RB211, or General Electric CF6-45/-50 series engines, as specified by affected service bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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