Document ID: chunk:federal_register_of_legislation:F2005L00694:body:0:p4
Version: federal_register_of_legislation:F2005L00694
Segment Type: other
Provision Reference: 
Character Range: 10457–15753

Series 3.
        Slingsby Aviation Ltd               T67M260, T67M260-T3A.

                   SOCATA-Group Aerospatiale                                                                                                                                                                                                                                                                                                                                                                                                                         TB9, TB10, TB20, TB21, TB200, TBM 700, M.S. 760, M.S. 760 A, M.S. 760 B, Rallye 100S, Rallye 150ST, Rallye 150T, Rallye 235E, Rallye 235C, MS 880B, MS 885, MS 894A, MS 893A, MS 892A-150, MS 892E-150, MS 893E, MS 894E, GA-7.
                   Tiger Aircraft LLC                                                                                                                                                                                                                                                                                                                                                                                                                                AA-1, AA-1A, AA-1B, AA-1C, AA-5, AA-5A, AA-5B, AG-5B.
                   Twin Commander Aircraft Corporation                                                                                                                                                                                                                                                                                                                                                                                                               500, 500-A, 500-B, 500-U, 500-S, 520, 560, 560-A, 560-E, 560F, 680, 680E, 680F, 680FL, 680FL(P), 680T, 680V, 680W, 681, 685, 690, 690A, 690B, 690C, 690D, 695, 695A, 695B, 720, 700.
                   Univair Aircraft Corporation                                                                                                                                                                                                                                                                                                                                                                                                                      108, 108-1, 108-2, 108-3, 108-5.
               Vulcanair S.p.A                                                                                                                                                                                                                                                                                                                                                                                                                                       P68, P68B, P68C, P68C-TC, P68 "Observer," P68 "Observer 2," P68TC "Observer," AP68TP300 "Spartacus," AP68TP 600 "Viator".
               Zenair Ltd                                                                                                                                                                                                                                                                                                                                                                                                                                            CH2000.
Requirement:  Transponders with software version 3.00, 3.01, 3.02, 3.04 or 3.05 install software upgrade to at least version 3.06 in accordance in accordance with Garmin Mandatory Software Service Bulletin No. 0409 dated 19 July 2004.
              Transponders with software version 3.03 already installed require no further action.
              Note 2:  Version 3.03 is no longer available from Garmin.
              Note 3:  FAA AD 2005-01-19 Amdt 39-13944 refers.
Compliance:   Before 30 September 2005.
              This Amendment becomes effective on 14 April 2005.
Background:   The original issue of this Directive required the installation of GTX 330/330D Software Upgrade Version 3.03, 3.04 or 3.05.  This was the result of observations that the GTX 330 and GTX 330D may detect, from other aircraft, the S1 (suppression) interrogating pulse below the Minimum Trigger Level (MTL) and, in some circumstances, not reply.  The GTX 330/330D should still reply even if it detects S1 interrogating pulses below the MTL.

   This Amendment increases applicability to include GTX 33 and GTX 33D transponders and requires transponders to have software version 3.06 installed (transponders with version 3.03 are not affected).  The Amendment resulted from advice to the FAA from Garmin that software versions 3-04 and 3.05 inadvertently removed the correction to not suppress the S1 below the MTL and is issued to prevent interrogating aircraft from possibly receiving inaccurate replies due to suppression from aircraft equipped with the GTX 33/33D330/330D Mode S Transponders when the pulses are below the MTL.  The inaccurate replies could result in reduced vertical separation or unsafe TCAS resolution advisories.
   The original issue of this Directive became effective on 5 August 2004.

James Coyne
Delegate of the Civil Aviation Safety Authority

2 March 2005