AD 2013-21-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Cracking at the upper fastener holes in the riveted web in the horizontal stabilizer center section rear spar, which could lead to horizontal stabilizer separation and loss of control of the airplane.
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Required Actions
For Group III airplanes, perform an eddy-current inspection for cracks in the web and modify the web if no crack is found. If a crack is found, repair it before further flight. For Group IV airplanes, modify the web of the horizontal stabilizer center section rear spar.
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Compliance Time
Within 24 months or 2,500 flight cycles after the effective date of this AD, whichever occurs first, or before the accumulation of 60,000 total flight cycles.
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Affected Aircraft
The Boeing Company Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series airplanes, certificated in any category, identified as Group III and Group IV in Boeing Service Bulletin 55-46, dated April 8, 1970.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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