Airworthiness Directive · Amendment 39-18519 · Flight controls
Airbus Airplanes
Superseded. A later AD replaced this one: AD 2022-19-02. Comply with the one in force.
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.
We are adopting a new airworthiness directive (AD) for all Airbus Model A330-200 Freighter, A330-200, A330-300, A340-200, A340- 300, A340-500, and A340-600 series airplanes. 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. This AD requires inspecting certain THSAs to determine the number of total flight cycles the THSA has accumulated, and replacing the THSA if necessary. 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 (THS) and loss of control of the airplane.
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.
For Airbus Model A330-200 Freighter, A330-200, A330-300, A340-200, and A340-300 series airplanes having a THSA with a part number specified in paragraph (g)(1) of this AD: At the applicable time specified in paragraph (h)(1), (h)(2), or (h)(3) of this AD, replace each affected THSA with a serviceable THSA, in accordance with the Accomplishment Instructions of Airbus Service Bulletin A330-27-3199, dated July 15, 2014; or Airbus Service Bulletin A340-27-4190, dated July 15, 2014; as applicable.
Note 1 to paragraphs (h), (i), and (j) of this AD: The THSA life limits specified in Part 4—Aging System Maintenance of the Airbus A330 and A340 Airworthiness Limitations Sections are still relevant, as applicable to airplane model and THSA part number.
(1) For a THSA that has accumulated or exceeded 20,000 total flight cycles since the THSA's first installation on an airplane, or since the most recent NBB replacement, whichever is later, as of the effective date of this AD: Within 6 months after the effective date of this AD.
(2) For a THSA that has accumulated or exceeded 16,000 total flight cycles, but less than 20,000 total flight cycles since the THSA's first installation on an airplane, or since the most recent NBB replacement, whichever is later, as of the effective date of this AD: At the applicable time specified in paragraphs (h)(2)(i) and (h)(2)(ii) of this AD.
(i) For Model A330-200 Freighter, A330-200, and A330-300 series airplanes: Within 12 months after the effective date of this AD but without exceeding 20,000 total flight cycles.
(ii) For Model A340-200, and A340-300 series airplanes: Within 12 months after the effective date of this AD but without exceeding 20,000 total flight cycles.
(3) For a THSA that has accumulated less than 16,000 total flight cycles since first installation on an airplane, or since the most recent NBB replacement, whichever is later, as of the effective date of this AD: At the applicable time specified in paragraph (i) of this AD.
The requirements of this paragraph apply to Airbus Model A330-200 Freighter, A330-200, A330-300, A340-200, and A340-300 series airplanes having a THSA with a part number specified in paragraph (g)(1) of this AD that has accumulated less than 16,000 total flight cycles since first installation on an airplane, or since the most recent NBB replacement, whichever is later, as of the effective date of this AD. Not later than the date specified in paragraphs (i)(1), (i)(2), and (i)(3) of this AD, as applicable: For any THSA having reached or exceeded on that date the corresponding number of total flight cycles as specified in paragraphs (i)(1), (i)(2), and (i)(3) of this AD, as applicable, replace the THSA with a serviceable unit, in accordance with the Accomplishment Instructions of Airbus Service Bulletin A330-27-3199, dated July 15, 2014; or Airbus Service Bulletin A340-27-4190, dated July 15, 2014; as applicable.
(1) As of 12 months after the effective date of this AD: The THSA flight-cycle limit (since first installation on an airplane, or since last NBB replacement, whichever occurs later) is 16,000 total flight cycles.
(2) As of July 31, 2017: The THSA flight-cycle limit (since first installation on an airplane, or since last NBB replacement, whichever occurs later) is 14,000 total flight cycles.
(3) As of July 31, 2018: The THSA flight-cycle limit (since first installation on an airplane, or since last NBB replacement, whichever occurs later) is 12,000 total flight cycles.
For Airbus Model A340-500 and A340-600 series airplanes having a THSA with a part number specified in paragraph (g)(2) of this AD: Not later than the date specified in paragraphs (j)(1), (j)(2), (j)(3), and (j)(4) of this AD, as applicable, for any THSA having reached or exceeded on that date the corresponding number of total flight cycles as specified in paragraphs (j)(1), (j)(2), (j)(3), and (j)(4) of this AD, as applicable, replace each affected THSA with a serviceable THSA, in accordance with the Accomplishment Instructions of Airbus Service Bulletin A340-27-5062, dated July 15, 2014.
(1) As of the effective date of this AD: The THSA flight-cycle limit (since first installation on an airplane, or since last NBB replacement, whichever occurs later) is 6,000 total flight cycles.
(2) As of April 30, 2017: The THSA flight-cycle limit (since first installation on an airplane, or since last NBB replacement, whichever occurs later) is 5,200 total flight cycles.
(3) As of April 30, 2018: The THSA flight-cycle limit (since first installation on an airplane, or since last NBB replacement, whichever occurs later) is 4,400 total flight cycles.
(4) As of April 30, 2019: The THSA flight-cycle limit (since first installation on an airplane, or since last NBB replacement, whichever occurs later) is 3,500 total flight cycles.
For any part installed, as required by this AD, having a part number identified in paragraph (g)(1) or (g)(2) of this AD: From the dates specified in paragraphs (i) and (j) of this AD, as applicable, and prior to exceeding the accumulated number of total flight cycles corresponding to each time, replace each affected THSA with a serviceable part, in accordance with the Accomplishment Instructions of the applicable service information identified in paragraphs (k)(1), (k)(2), and (k)(3) of this AD.
(1) Airbus Service Bulletin A330-27-3199, dated July 15, 2014.
(2) Airbus Service Bulletin A340-27-4190, dated July 15, 2014.
(3) Airbus Service Bulletin A340-27-5062, dated July 15, 2014.
For the purposes of this AD, a serviceable THSA is a THSA:
(1) Having a part number identified in paragraph (g)(1) or (g)(2) of this AD that has not exceeded any of the total accumulated flight cycles identified in paragraphs (i)(1) through (i)(3) of this AD, or paragraphs (j)(1) through (j)(4) of this AD, as applicable; or
(2) Having a part number that is not identified in paragraph (g)(1) or (g)(2) of this AD.
From each date specified in paragraphs (i)(1), (i)(2), and (i)(3) of this AD, and paragraphs (j)(1) through (j)(4) of this AD, as applicable, a THSA having a part number identified in paragraph (g)(1) or (g)(2) of this AD may be installed on any airplane, provided the THSA has not exceeded the corresponding number of accumulated total flight cycles.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
