AD 2001-22-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 727 | Airworthiness Directives; Boeing Model 727 Series Airplanes |
Unsafe Condition
Corrosion or cracking in the outer hinge pins of the horizontal stabilizer could lead to structural degradation of the hinge of the horizontal stabilizer and result in loss of the horizontal stabilizer, which would result in loss of controllability of the airplane.
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Required Actions
Inspect for migration or corrosion of the outer hinge pins that attach the horizontal stabilizer to the vertical fin. Perform a torque test (referred to as a 'torque check') of the nut on the outer hinge pins, and reduce torque values if necessary. Conduct repetitive detailed visual and magnetic particle inspections for corrosion or cracking of the outer and inner hinge pins, including removal and application of corrosion preventative compound or grease on the hinge pins. Replace migrated, cracked, or broken hinge pins with new or serviceable hinge pins.
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Compliance Time
Before further flight
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Affected Aircraft
All Boeing Model 727 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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