AD 2013-17-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A318 | Airworthiness Directives; Airbus Airplanes |
Unsafe Condition
Corrosion affecting the ballscrew lower splines between the tie-bar and screw-jack in certain trimmable horizontal stabilizer actuators (THSA), which could lead to ballscrew rupture, transmission of THSA torque loads from the ballscrew to the tie-bar, THSA blowback, and possible loss of control of the airplane.
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Required Actions
Repetitive inspections of the THSA ballscrew lower splines to detect corrosion. Ballscrew integrity tests, if necessary. Replacement of affected THSAs if corrosion is found. Inspections must be conducted within specified intervals, starting within 22 years of THSA first flight or within three months after the effective date of the AD.
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Compliance Time
Within 22 years of THSA first flight or within three months after the effective date of the AD, with subsequent inspections at intervals not exceeding 24 months.
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Affected Aircraft
All Airbus Model A318, A319, A320, and A321 series airplanes equipped with THSA Part Number 47145-XXX.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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