AD 2007-21-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 707 | Airworthiness Directives; Boeing Model 707 Airplanes and Model 720 and 720B Series Airplanes |
Unsafe Condition
Stress corrosion cracking of the elevator hinge support fittings of the horizontal stabilizer trailing edge has been discovered, which could reduce elevator support stiffness and lead to in-flight airframe vibration, consequent damage to the elevator and horizontal stabilizer, and reduced controllability of the airplane.
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Required Actions
Identify the material used in the elevator hinge support fittings, perform repetitive detailed inspections for cracking, replace cracked or damaged fittings with serviceable or improved fittings, and eventually replace all affected fittings with new, improved fittings made of 7075-T7351 material.
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Compliance Time
Within 180 days after the effective date or before further flight after any horizontal stabilizer is replaced.
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Affected Aircraft
All Boeing Model 707-100 long body, -200, -100B long body, -100B short body series airplanes; Model 707-300, -300B, -300C, and -400 series airplanes; and Model 720 and 720B 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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