AD 99-10-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; Boeing Model 747-100, 747-200, and 747-SP Series Airplanes and Military Type E-4B Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; Boeing Model 747-100, 747-200, and 747-SP Series Airplanes and Military Type E-4B Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; Boeing Model 747-100, 747-200, and 747-SP Series Airplanes and Military Type E-4B Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; Boeing Model 747-100, 747-200, and 747-SP Series Airplanes and Military Type E-4B Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; Boeing Model 747-100, 747-200, and 747-SP Series Airplanes and Military Type E-4B Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; Boeing Model 747-100, 747-200, and 747-SP Series Airplanes and Military Type E-4B Airplanes |
| aircraft | The Boeing Company | 747SP Series | Airworthiness Directives; Boeing Model 747-100, 747-200, and 747-SP Series Airplanes and Military Type E-4B Airplanes |
Unsafe Condition
Fatigue cracking of the wing front spar web at the fastener rows behind and between the upper link fittings for the number 2 and 3 engine struts, which could result in a fuel leak and consequent increased risk of a fire.
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Required Actions
Perform an ultrasonic inspection to detect cracking of the wing front spar web in accordance with Boeing Service Bulletin 747-57A2303, Revision 1. Repeat inspections at intervals not to exceed 2,200 or 3,000 flight cycles depending on airplane group. Repair cracks prior to further flight by either accomplishing the terminating action per the service bulletin or using an approved repair method.
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Compliance Time
Prior to the accumulation of 12,500 or 18,000 total flight cycles (depending on airplane group) or within 15 months after the effective date of this AD, whichever occurs later. Repeat inspections at intervals not to exceed specified flight cycles.
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Affected Aircraft
Boeing Model 747-100, 747-200, 747-SP series airplanes and military type E-4B airplanes as listed in Boeing Service Bulletin 747-57A2303, Revision 1.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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