AD 2020-21-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
The upper wing skin at engine nacelle attachment points may be subject to undetected cracking.
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Required Actions
At the applicable times specified in the "Compliance" paragraph of Boeing Alert Requirements Bulletin 747-57A2363 RB, dated December 23, 2019, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 747-57A2363 RB, dated December 23, 2019.
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Compliance Time
Within the compliance times specified, unless already done.
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Affected Aircraft
All The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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