airworthiness · Rule · Final rule. · Published 2013-08-23 · Effective 2013-09-27 · 78 FR 52405
Document
Document number
2013-19161
Federal Register citation
78 FR 52405
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Airbus
Publication date
2013-08-23
Effective date
2013-09-27
FAA docket
Docket No. FAA-2013-0335
Abstract
We are adopting a new airworthiness directive (AD) for certain Airbus Model A330-300, A340-200, and A340-300 series airplanes. This AD was prompted by a determination that ballscrew rupture could occur on certain trimmable horizontal stabilizer actuators (THSAs). This AD requires repetitive THSA ballscrew shaft integrity tests, and replacement if necessary. We are issuing this AD to detect and correct ballscrew rupture, which, along with corrosion on the ballscrew lower splines, may lead to loss of transmission of THSA torque loads from the ballscrew to the tie-bar and consequent THSA blowback, which could result in loss of control of the airplane.