AD 2016-08-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Stress corrosion and potential early fatigue cracking in the horizontal stabilizer, which could compromise the structural integrity of the stabilizer.
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Required Actions
Replace all chord segments made of 7079 aluminum with new, improved chord segments made of 7075 aluminum. Inspect certain structurally significant items, and repair discrepancies if necessary. For certain airplanes, use redefined flight cycle counts; determine the type of material of the horizontal stabilizer, rear spar, and upper and lower chords on the inboard and outboard ends of the rear spar; repetitively inspect for cracking of the horizontal stabilizer components; and repair or replace the chord, or modify chord segments made of 7079 aluminum, if necessary.
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Compliance Time
Within 12 months of the effective date (May 27, 2016).
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Affected Aircraft
The Boeing Company Model 707 airplanes, and Model 720 and 720B series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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