AD 2011-27-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Extensive corrosion of the ballscrew used in the drive mechanism of the horizontal stabilizer trim actuator (HSTA), leading to undetected failure of the primary load path and subsequent wear and failure of the secondary load path, which could result in loss of control of the horizontal stabilizer and consequent loss of control of the airplane.
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Required Actions
Repetitive inspections, lubrications, and overhauls of the ball nut and ballscrew and attachment (Gimbal) fittings for the trim actuator of the horizontal stabilizer; various modifications; and corrective actions if necessary, as applicable.
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Compliance Time
Within 24 months of the effective date of the AD.
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Affected Aircraft
All Model 737 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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