AD 2014-24-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Cracks emanating from the aft-most barrel nut holes of the left and right upper rear spar caps of the horizontal stabilizer, which could propagate until the upper rear spar cap severs, and result in failure of the horizontal stabilizer upper center or aft skin panel and adversely affect the structural integrity of the airplane.
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Required Actions
Perform repetitive high frequency eddy current (ETHF) inspections for cracks in the areas around the two aft-most barrel nut holes of the upper rear spar caps, and take corrective action if necessary. Repeat ETHF inspections for cracks in the areas around the two aft-most barrel nut holes of any repaired or replaced upper rear spar cap, and take corrective actions if necessary.
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Compliance Time
Within the compliance times specified in Boeing Alert Service Bulletin MD90-55A017, dated September 27, 2013.
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Affected Aircraft
All The Boeing Company Model MD-90-30 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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