Airworthiness directives › 2016-10-08
AD 2016-10-08 Airworthiness Directives; Airbus Airplanes
Models named: A330-201, -202, -203, -223, -243, A330-223F, -243F, A330-301, -302, -303. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to the Airbus airplanes, certificated in any category, identified in paragraphs (c)(1) through (c)(7) of this AD, all manufacturer serial numbers. (1) Model A330-201, -202, -203, -223, and -243 airplanes. (2) Model A330-223F and -243F airplanes. (3) Model A330-301, -302, -303, -321, -322, -323, -341, -342, and -343 airplanes. (4) Model A340-211, -212, and -213 airplanes. (5) Model A340-311, -312, and -313 airplanes. (6) Model A340-541 airplanes. (7) Model A340-642 airplanes.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 90 days after the effective date of this AD: Inspect the THSA to determine if it has a part number that is specified in paragraph (g)(1) or (g)(2) of this AD, and to determine the total number of flight cycles accumulated since the THSA's first installation on an airplane, or since the most recent NBB replacement. A review of airplane delivery or maintenance records is acceptable in lieu of this inspection if the part number of the THSA can be conclusively determined from that review. (1) For Model A330-200 Freighter, A330-200, A330-300, A340-200 and A340-300 series airplanes: Part number (P/N) 47147-500, 47147-700, 47172-300, 47172-500, 47172-510, or 47172-520. (2) For Model A340-500 and -600 series airplanes: P/N 47175-200, 47175-300, 47175-500, or 47175-520.
Unsafe condition
This AD was prompted by the results of endurance qualification tests on the trimmable horizontal stabilizer actuator (THSA), which revealed a partial loss of the no-back brake (NBB) efficiency in specific load conditions. We are issuing this AD to detect and correct premature wear of the carbon friction disks on the NBB of the THSA. Such a condition could lead to reduced braking efficiency in certain load conditions and, in conjunction with the inability of the power gear train to keep the ball screw in its last commanded position, could result in uncommanded movements of the trimmable horizontal stabilizer and loss of control of the airplane.
Affected ADs
None.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1