AD 98-15-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; Boeing Model 747-100 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; Boeing Model 747-100 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; Boeing Model 747-100 Series Airplanes |
Unsafe Condition
Cracked or broken fasteners in the wing front spar web above engine numbers 2 and 3 may cause fuel leakage onto an engine and a resultant fire.
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Required Actions
Accomplish inspections including detailed visual inspection of wing front spar components, ultrasonic inspection of the web and fasteners between FSS 570 and FSS 684, and repeat inspections at intervals not exceeding 2,000 flight cycles until further actions are taken. Optional terminating action (fastener replacement between FSS 570 and FSS 684) is available.
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Compliance Time
Required as indicated, unless accomplished previously. Compliance deadlines include prior to 13,000 total flight cycles, within 9 months after March 23, 1995, or within 2,000 flight cycles after the preceding inspection, whichever is latest.
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Affected Aircraft
Boeing Model 747-100 Series, 747-100B Series, 747-100B SUD Series airplanes as listed in Boeing Alert Service Bulletin 747-57A2266, Revision 5, dated August 3, 1995.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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