Airworthiness Directive · Amendment 39-17963 · Navigation
Airbus Airplanes
This AD applies to all Airbus airplanes, certificated in any category, identified in paragraphs (c)(1) through (c)(4) of this AD.
(1) Model A318-111, -112, -121, and -122 airplanes.
(2) Model A319-111, -112, -113, -114, -115, -131, -132, and -133 airplanes.
(3) Model A320-211, -212, -214, -231, -232, and -233 airplanes.
(4) Model A321-111, -112, -131, -211, -212, -213, -231, and -232 airplanes.
We are adopting a new airworthiness directive (AD) for all Airbus Model A318, A319, A320, and A321 series airplanes. This AD requires repetitive on-ground power cycles (resets) of the Transponder, Terrain and Traffic Collision Avoidance System (T3CAS). This AD was prompted by reports of spurious terrain ahead warning system (TAWS) alerts during approach and takeoff. We are issuing this AD to prevent spurious TAWS alerts, which could increase flightcrew workload during critical landing or takeoff phases, and result in reduced control of the airplane.
For airplanes equipped with a Transponder, Terrain and Traffic Collision Avoidance System (T3CAS) unit having a part number and associated software standard identified in paragraph (g)(1), (g)(2), or (g)(3) of this AD: Within 30 days after the effective date of this AD, do an on-ground power cycle (reset) of the T3CAS, in accordance with the instructions of Airbus Alert Operators Transmission A34N004-13, Revision 01, dated March 19, 2014. Repeat the on-ground power cycle thereafter at intervals not to exceed 120 hours of continuous power of the T3CAS.
(1) Part number 9005000-10000 and software standard 1.0.
(2) Part number 9005000-10101 and software standard 1.1.
(3) Part number 9005000-10202 and software standard 1.2.
Airplanes on which Airbus modification 39146, 152980, or 154341 has not been incorporated in production are not affected by the requirements of paragraph (g) of this AD, provided no T3CAS unit having a part number and associated software standard identified in paragraph (g)(1), (g)(2), or (g)(3) of this AD is installed on that airplane.
As of the effective date of this AD, installation on an airplane of a T3CAS unit having a part number and software standard as identified in paragraph (g)(1), (g)(2), or (g)(3) of this AD is acceptable, provided the conditions specified in both paragraphs (i)(1) and (i)(2) of this AD are met.
(1) After installation of the T3CAS unit, the unit is repetitively power cycled as required by paragraph (g) of this AD.
(2) The T3CAS unit has accumulated less than 120 hours of continuous power.
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.
