Document ID: chunk:federal_register_of_legislation:F2006B06534:body:0:p1
Version: federal_register_of_legislation:F2006B06534
Segment Type: other
Provision Reference: 
Character Range: 20–3761

AIRWORTHINESS DIRECTIVE

 For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/RAD/79 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

 Radio Communication and Navigation Equipment

 AD/RAD/79
 Amdt 1

 Thales Avionics TA/RA VSI-TCAS Indicator 6/2004
                                        DM

            Applicability: All Thales Avionics (formerly Sextant Avionique) TA/RA VSI-TCAS indicator with the following part numbers (P/N) installed in conjunction with a TCAS II Change 7 (ACAS II) computer.

457400EA0311    457400GB1312  457400PB1900
457400EB0311    457400GB1900  457400RA0711
457400FA0311    457400GB2000  457400RB0711
457400FB0311    457400GB2100  457400SA0711
457400GA0311    457400HA1900  457400SB0711
457400GA0602    457400JA1900  457400TB0811
457400GA0911    457400KA0602  457400TC0811
457400GA1100    457400KA1311  457400UA1311
457400GA1311    457400KA1900  457400UA1900
457400GA1312    457400KB1311  457400UB1311
457400GA1900    457400KB1900  457400UB1900
457400GA0011    457400LA2000  457400WA0811
457400GB0011    457400MA0602  457400WB0811
457400GB0911    457400MA1311  457400ZA1900
457400GB1100    457400MB1311
457400GB1311    457400PA1900

            Note 1: This Directive is not applicable to indicators with the following P/N as they are installed in conjunction with TCAS I computers:

                457400GA1502
                457400GB1502

   457400MA1502
   457400MB1502

        457400ZA1502
        457400ZB1502

              Requirement: 1. If not previously accomplished in accordance with the original issue of this Directive, amend the Aircraft Flight Manual (AFM) of all aircraft, equipped with an ACAS II computer and a TA/RA VSI-TCAS indicator with a P/N listed in the Applicability Statement not modified in accordance with Requirement 2, to include the following ACAS II temporary limitation:

                "Limitation:

                When a "Don't climb-Don't descend-Maintain" Resolution Advisory is triggered, the TA/RA VSI-TCAS may indicate an RA fail message whereas audio annunciation ("Maintain Vertical Speed, Maintain") and traffic display information are correct. In this specific case, the crew should follow the audio annunciation and therefore maintain the vertical speed until the clear of conflict condition has occurred."

              Inserting a copy of this Directive in the AFM is an acceptable means of complying with this Requirement.

              2. Modify the software of all TA/RA VSI-TCAS indicators, with a P/N listed in the Applicability Statement, installed on aircraft equipped with an ACAS II computer in accordance with the following Thales Avionics Service Bulletins, as applicable:

                457400-34-082
                457400-34-083
                457400-34-084, and
                457400-34-085

              Following modification of the affected indicator the temporary limitation may be removed from the AFM.

            Note 2: It is the responsibility of the operator to check with the design approval holder of the ACAS II installation that TA/RA VSI-TCAS equipment software modification doesn't alter the initial aircraft ACAS II installation airworthiness