TT31 Minor Change Library
At Trig we have developed a set of EASA approved upgrade instructions that document the process of installing the TT31 transponder in a range of aircraft. Trig installers can use these instructions to achieve airworthiness compliance without needing to seek further approval from EASA.
These Minor Change Approvals are free.
First – we suggest that you look at the Aircraft Approved Type List within the Minor Change Approval Summary Sheets (below). Use this to verify that your specific aircraft model is featured within the Minor Change Approval.
Next – find your specific aircraft model from the individual aircraft links (at the foot of this page). Clicking on each link takes you to the EASA Minor Change Approval Certificate.
Finally – The Minor Change Approval Certificate for your aircraft will indicate the relevant ‘Associated Technical Document’ that must be followed as part of the installation. Please see the relevant technical document in the Minor Change Master Instructions section below.
Minor Change Approval Summary Sheets
Certain approval certificates include standard text inserted by EASA which says “The installation of this modification by third persons is subject to written permission of the approval holder”. For the avoidance of doubt, we hereby grant that permission, and this web page may be referred to as evidence of that permission.
For space reasons, both the EASA Approval Sheets and this web page have abbreviated some sub-type information, where aircraft model variant approvals still apply. The following master documents show the complete list of all approved EASA models and variants for those types.
Fixed Wing (CS-23) Aircraft Approved Type List (revision 2.0)
Powered Sailplane (CS-22) Aircraft Approved Type List (revision 1.0)
If you are installing a TT31 transponder in an aircraft type NOT shown here, but for which the minor change instructions would apply, Trig Avionics grant you permission to use the published minor change instructions as the basis for your own application.
Minor Change Master Instructions
The Minor Change Master Instructions are available for download here.
Fixed Wing (CS-23) TT31 Minor Change Instructions (latest revision, issue 1.6).
Fixed Wing (CS-VLA) TT31 Minor Change Instructions (latest revision, issue 2.0).
Powered Sailplane (CS-22) TT31 Minor Change Instructions (latest revision, issue 2.0).
Small Rotorcraft TT31 Minor Change Instructions (latest revision, issue 4.0).
As our library of Minor Changes has expanded we have responded to questions from our installers. As a result we have made improvements to these Master Instructions. The information in the latest revisions are still applicable to all the Minor Changes listed below. Because there is information in the latest document that is not included in the earlier revisions we recommend that installers refer to the latest document. For completeness however the previous versions of the Fixed Wing instructions are still available for download: (Fixed Wing Issue 1.4) or (Fixed Wing Issue 1.5)
Alenia Aermacchi
Alpha
HR200, R2100, R2112, R2120, R2160
American Champion
AMS
Apex Aircraft
ATL, CAP10, CAP20, CAP21, CAP230, CAP231, CAP232, DR220, DR221, DR250, DR253
Aquila
Aviat
Beagle
Beechcraft
19A, 19B, 19M, 23, A23, C23 E33, E33C, J35, K35, N35, P35, S35, V35, V35A, V35B, 35-33,35-B33, 35-C33, 35-C33A, 36, A36, A36AT, A36TC, B36TC, 77
Bell Helicopters
Bölkow
Cessna
C120, C140, C150, C152, C170, C172, C175, C177, C180, C182, C188, C206, C207, C210,
Individual subtype letters have been omitted for space reasons. All these Cessna approvals cover the complete series and where appropriate apply to aircraft manufactured in either France or the USA.
Cirrus
Constuctii Aeronautice
Diamond
DA20-A1, DA20-C1, DV20, DA40, H-36 Dimona, HK36, HK 36 Super Dimona
EADS Deutschland GmbH
E.I.S. Aircraft GmbH
Eurocopter
AS350B, AS350 B1, AS350 B2, AS350 B3, AS350 BA, AS350 BB, AS350 D, EC130 B4
Evektor
Extra
EA300, EA300/L, EA300/S, EA300/200
FLS Aerospace Ltd
Fournier
Fuji
FA200-160, FA200-180, FA200-180AO
Gardan
General Avia
Grob
Grumman
AA-1, AA-1A, AA-1B, AA-1C, AA-5, AA-5A, AA-5B, AG-5B
HB Flugtechnik
HB 21, HB 21/2400, HB 21/2400 B, HB 23/2400, HB 23/2400SD, HB 23/2400 Scanliner, HB 23/2400 V2
Maule
M-4, M-4-210C, M-5-210C, M-5-235C, M-6-235, M-7-235, MX-7-180, MX-7-235, MXT-7-180,MX-7-180A, MXT-7-180A
M&D Flugzeugbau
Mooney
Morane-Saulnier
MS880, MS883, MS892, MS893, MS894 (Rallye)
Moravan (Zlin)
Z142, Z42, Z43, Z143, Z50, Z242, Z126, Z226, Z326, Z526, Z726
Pilatus
Piper
J3, PA-12, PA-18, PA-22, PA-24, PA-28, PA-32, PA-38-112
Individual subtype letters have been omitted for space reasons. All these Piper approvals cover the complete series.
PZL
M18, M26, M28, PZL-101, PZL-102, PZL-104 Wilga, PZL-106, PZL-Kruk, Koliber 110, 150
Robin
DR300, DR315, DR340, DR360, DR380, DR400, DR500, HR100 and HR200, R1180, R2100,R2100A, R2160D, R3000
Robinson
Rockwell Commander
Scheibe
Siai Marchetti
260, 260B, 260C, 260D, 260E, 260F
Slingsby
Socata
TB9, TB10, TB20, TB21, TB200, Rallye 100, 110, 150