AD 98-08-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
Unsafe Condition
Fatigue cracking and stress corrosion of the vertical chords, midspar webs, and canted closure webs in the wing strut could result in failure of the strut-to-wing interface and separation of the engine and strut from the airplane.
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Required Actions
Conduct repetitive detailed visual and/or borescope inspections of the wing spar areas (midspar fitting vertical legs, aft torque bulkhead vertical chords, midspar webs, and midspar canted closure webs) per Boeing Alert Service Bulletin 747-54A2179, Revision 2. Correct discrepancies within specified limits via repair per the bulletin; address those outside limits using FAA-approved methods.
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Compliance Time
Effective April 28, 1998
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Affected Aircraft
Boeing Model 747-100, -200, and -300 series airplanes with line positions 1 through 886 inclusive, excluding those with strut/wing modification.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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