AD 2017-02-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Widespread corrosion damage found on the skin inner surface along the upper bulkhead at certain stations between certain stringers.
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Required Actions
Repetitive inspections of the fuselage crown skin inner surface are required, along with related investigative and corrective actions if necessary. Terminating actions for the repetitive inspections are also allowed.
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Compliance Time
Before further flight if terminating actions are taken; otherwise, inspections are repetitive with no specific compliance time.
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Affected Aircraft
The Boeing Company Model 747-400, -400D, and -400F series airplanes, as identified in Boeing Alert Service Bulletin 747-53A2878, dated May 19, 2016.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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