airworthiness · Rule · Final rule. · Published 2012-12-27 · Effective 2013-01-31 · 77 FR 76228
Document
Document number
2012-30369
Federal Register citation
77 FR 76228
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Airbus
Publication date
2012-12-27
Effective date
2013-01-31
FAA docket
Docket No. FAA-2012-0995
Abstract
We are adopting a new airworthiness directive (AD) for all Airbus Model A330-300 series airplanes and Model A340-200 and -300 series airplanes. This AD was prompted by reports that, during a flight test, several spoiler servo-controls (SSCs) did not remain locked in the retracted position (hydraulic locking function) after manual depressurization of the corresponding hydraulic circuit. Loss of that locking function--which is ensured by a blocking valve--was caused by an internal leak from a sheared seal on the blocking valve. This AD requires inspecting to determine if certain SSCs are installed, performing an operational test of any affected SSC, and replacing if necessary. We are issuing this AD to prevent loss of the hydraulic locking function during take-off and go-around phases, which, in combination with malfunction of one engine, could result in reduced controllability of the airplane.