AD 2012-17-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Stress corrosion cracking in the chord segments made from 7079 aluminum in the horizontal stabilizer rear spar, and potential early fatigue cracking in the chord segments made from 7075 aluminum.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
For certain airplanes, use redefined flight cycle counts, determine the material type of the horizontal stabilizer, rear spar, and upper and lower chords, repetitively inspect for cracking, and repair or replace chord segments made from 7079 aluminum if necessary. For all airplanes, inspect certain structurally significant items and repair discrepancies if necessary.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 707-100 long body, -200, -100B long body, and -100B short body series airplanes; Model 707-300, -300B, -300C, and -400 series 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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