AD 2013-15-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Cracking in the left-side chord of the fin closure rib on the vertical stabilizer, which could lead to widespread cracking and corrosion in the chords, weakening the fin closure rib structure, and resulting in loss of airplane control due to lack of horizontal stabilizer support.
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Required Actions
Perform detailed inspections and High Frequency Eddy Current (HFEC) inspections of the left- and right-side chords of the fin closure rib for cracking and corrosion, in accordance with Boeing Special Attention Service Bulletin 727-55-0095. Repair or replace affected chords if cracking or corrosion is found. Repeat inspections at intervals not to exceed 26 months.
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Compliance Time
Within 24 months after the effective date of the AD.
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Affected Aircraft
All The Boeing Company Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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