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Trig Avionics Limited Service Bulletin Page 1 of 3 SUP/KT74/005 Issue 1.0 1 October 2018
KT74 SERVICE BULLETIN Identifier: SUP/KT74/005 ISSUE 1.0
DATE: 1st October 2018
SUBJECT: KT74 retaining cam replacement _____________________________________________________________________
APPLICABILITY This Service Bulletin applies to KT74 transponders approved under ETSO authorisation EASA.21O.10046583, part number 01157-00-(XX) and part number 01158-00-(XX) which are:
Serial number from 01143 to 02955;
Modification Level 0;
Installed in an orientation which is NOT a conventional aft-facing avionics stack mounting.
PURPOSE Trig has determined that KT74 transponders in the listed serial number range may have been assembled with a retaining cam that could fail when installed in an unconventional orientation.
The retaining cam is a small nylon part that engages in the mounting tray when the transponder is installed in the aircraft. Although this has no effect on the normal operation of the transponder, the retaining cam is required to withstand very high loads during an impact to prevent the transponder coming out of the mounting tray.
The transponders with the retaining cam that fall into the serial number range listed above have been re-tested and meet the crashworthiness requirements when mounted in a typical avionics rack oriented in the conventional manner (control panel facing aft, with the transponder level or angled upward). If however the transponder is mounted in an unusual orientation, for example if it is mounted facing forward at a third crew member station on a larger aircraft, it may not meet the intended aircraft crashworthiness level.
The retaining cams cannot be easily identified by visual inspection. For any transponder in the affected range that is installed in any way other than with the connectors toward the nose of the aircraft the retaining cam must be replaced.
Trig Avionics Limited Service Bulletin Page 2 of 3 SUP/KT74/005 Issue 1.0 1 October 2018
DESCRIPTION This bulletin describes the process removing the transponder, checking the Mod Level, and if required, returning the transponder to Trig Avionics for replacement or repair.
COMPLIANCE This service bulletin is MANDATORY. This service bulletin must be accomplished within 6 months.
The technical content of this document has been produced in accordance with alternative procedure to DOA reference AP205.
EQUIPMENT REQUIRED Standard aircraft tools for removal of the transponder.
A ramp test set to verify correct reinstallation of the transponder after inspection and/or rectification.
ACCOMPLISHMENT INSTRUCTIONS
1. Review the transponder installation. If the transponder is installed in a conventional aft-facing avionics rack, you may record compliance with this Service Bulletin in the aircraft logs and NO FURTHER ACTION IS REQUIRED. If you believe that the installation may fall within the scope of this Service Bulletin please continue with Step 2.
2. Prepare the aircraft for maintenance.
3. Remove the KT74 from the aircraft.
4. Inspect the serial number of the KT74. If the serial number falls outside the range specified in the applicability section or if the serial number is within the range but the modification strike off is identified then the transponder can be reinstalled. You may record compliance with this Service Bulletin in the aircraft logs and NO FURTHER ACTION IS REQUIRED.
5. If the transponder installation is within the scope of this Service Bulletin, please contact Trig Avionics Limited or a Trig Avionics service centre with details of the installation. Please provide aircraft type, installation location, and any supporting installation references, such as Minor Change numbers or STC information.
6. If Trig Avionics confirm that your installation falls within the scope of this Service Bulletin they will provide an RMA number and shipping instructions.
Return the unit as directed for modification. You may elect to receive a Service Exchange unit, or to receive your existing unit with the retaining cam replaced.
7. Modified units will be identified with strike-off 1.
8. Upon receipt of the updated unit, reinstall it and complete the post installation checks in accordance with the KT74 Mode S Transponder Installation Manual, P/N 01114-00.
Trig Avionics Limited Service Bulletin Page 3 of 3 SUP/KT74/005 Issue 1.0 1 October 2018 AFM AND PILOT’S MANUAL CONSIDERATIONS The pilot operating manual does not require any update and remains revision AC.
REFERENCES KT74 Mode S Transponder Installation Manual, P/N 01114-00-AD.
KT74 Mode S Transponder Operating Manual, P/N 01115-00-AC.
MANPOWER One hour (1.0 hr) labour for removal and reinstallation.
WARRANTY This service bulletin is warranty reimbursable.