# JASC 3452: ATC Transponder System

- Type: JASC system/component code (FAA)
- ATA chapter: 34 Navigation
- Title in the code table: ATC TRANSPONDER SYSTEM
- Service difficulty reports: 624
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=40
- Page: https://openairdocs.org/jasc/3452

## What it covers

The air traffic control (ATC) system which receives coded signals from a ground station and transmits a coded reply for altitude reporting and identification purposes. Typical parts are transponder, antenna, control unit, transceiver, coaxial connecting cables, etc.

## Service difficulty reports (624, newest 50)

- [SDR DALA2026053103305](https://openairdocs.org/sdr/DALA2026053103305), May 28, 2026: Airbus A319114. TRANSPONDER. FAILED. ATC REPORTED INTERMITTENT MODE C. ALTITUDE REPORTING FAILURES IN ROUTE. ATC TRANSPONDER/AUTOMATIC ALTITUDE REPORT SYS AN (N370NB)
- [SDR AALA202508192006](https://openairdocs.org/sdr/AALA202508192006), Aug 15, 2025: Boeing 737823. CONTROL PANEL. ODOR. AIRCRAFT WAS GROUNDED: ACRID SMELL IN FLIGHT DECK. ACCOMPLISHED CARD 08L00021001. FOUND TCAS AND ATC PANEL PRODUCING ACR (N969NN)
- [SDR YENA2025080500801](https://openairdocs.org/sdr/YENA2025080500801), Aug 4, 2025: Airbus A321271NX. TRANSPONDER. NO TEST. FLT#2260, MAD-BOS. (ETOPS) ATC/XPDR 2 FAILED DURING PRE FLIGHT ( ATC SYSTEM - TRANSPONDER SINGLE POSITION ); OPERATIONAL (N4062J)
- [SDR ABXA20250804170](https://openairdocs.org/sdr/ABXA20250804170), Aug 4, 2025: Boeing 767383. TRANSPONDER. INOPERATIVE. ON TAXI OUT, ATC TRANSPONDER INOP. AIRCRAFT RETURNED TO BLOCKS. (BTB). MAINTENANCE PERFORMED OPS TEST OF TRANSPONDER IAW (N219CY)
- [SDR MTNA20250327001](https://openairdocs.org/sdr/MTNA20250327001), Mar 27, 2025: Cessna 208B. TRANSPONDER. INOPERATIVE. DURING CLIMB OUT FOR FLIGHT 8300 EWR-IAD, THE PIC IDENTIFIED THE TRANSPONDER WAS INOP AND COMPLETED AN AIR RETURN, DECLA (N988FE)
- [SDR SWI2024F00559](https://openairdocs.org/sdr/SWI2024F00559), May 13, 2024: Cndair CL6002D24. ANTENNA. SCRATCHED. FORWARD ATG ANTENNA HAS TOOLING MARKS AROUND THE CONNECTOR HOLES, HN00159971 (C-CHECK RO 7/9/2024) REPLACED NEW FWD ATG  (N679CA)
- [SDR ABXA20240319859](https://openairdocs.org/sdr/ABXA20240319859), Mar 18, 2024: Boeing 767383. CONTROL PANEL. INOPERATIVE. ATC COULD NOT READ XPONDER, NEITHER L NOR R. AC RETURNED TO GATE. MAINTENANCE PERFORMED TROUBLESHOOTING RESULTING IN REP (N219CY)
- [SDR ABXA20240216525](https://openairdocs.org/sdr/ABXA20240216525), Feb 15, 2024: Boeing 767383. TRANSPONDER. UNKNOWN. ATC REPORTED ONLY PRIMARY ON THE L XPDR SWAPPED TO R NO CHANGED AC RETURENED TO GATE AND MAINTENANCE GROUNDED AC. MAITEN (N219CY)
- [SDR 2023FA0000414](https://openairdocs.org/sdr/2023FA0000414), Aug 12, 2023: Cessna 208B. TRANSPONDER. DEFECTIVE. PILOT OBSERVED SMOKE IN COCKPIT CAUSED BY FAULTY TRANSPONDER INSTALLED UNDER STC# SA01512WI-D 07/09/2010. FOUND BURNT CH (N939FE)
- [SDR GTIA2023072437350](https://openairdocs.org/sdr/GTIA2023072437350), Jul 22, 2023: Airbus A320232. TRANSPONDER. FAULT MESSAGE. TRANSPONDER SYSYTEM 1 +2 FAILED IN FLIGHT NAV TCAS FAULT-PERFORMED BITE TEST OF THE TCAS IAW AMM 34-43-00-740-A. NO FAUL (N695NK)
- [SDR 2023FA0000322](https://openairdocs.org/sdr/2023FA0000322), Jun 21, 2023: Piper PA28181. TRANSPONDER. WARNING MESSAGE. GARMIN GTX345 TRANSPONDER FAILED ON TAKE OFF. "XPDR FAIL" CAS MESSAGE. TRANSPONDER SEEMS TO HAVE QUIT COMMUNICATING WITH (N713ND)
- [SDR DXTA2023021480470](https://openairdocs.org/sdr/DXTA2023021480470), Feb 13, 2023: Bombdr BD1001A10. UNKNOWN. UNKNOWN. DURING CRUISE AT FL410 A TCAS IN STBY DIDPLAYED ON THE MFD AND A WHITE XPDR IN STBY CAS MESSAGE DISPLAYED. TRANSPONDER W (N762QS)
- [SDR DXTA2021081246810](https://openairdocs.org/sdr/DXTA2021081246810), Aug 11, 2021: Bombdr BD1001A10. TRANSPONDER. FAULTED. AMBER XPDR 1 FAIL CAS MESSAGE ILLUM. C/B TRIPPED WITH ODOR OF SMOKE. SMOKE ODOR DISSIPATED WITH BREAKER OFF. T/S FAILED  (N779QS)
- [SDR AALA202105179030](https://openairdocs.org/sdr/AALA202105179030), May 14, 2021: Boeing 737823. CONTROL PANEL. SMOKE. AIRCRAFT WAS GROUNDED: AT FL340, EXPERIENCED SMOKE IN COCKPIT FROM "FL' BUTTON ON TRANSPONDER AND FOUND "ELECTRICAL PANE (N909NN)
- [SDR SIMA20210329003](https://openairdocs.org/sdr/SIMA20210329003), Mar 29, 2021: Emb EMB145LR. TRANSPONDER. FAILED. AVIONICS ISSUES TRANSPONDER 1 FAIL NO FMS GS AFTER ROTATION FD WENT AWAY MFD TRACKING INCORRECTLY NO EICAS MESSAGE EMERG (N696AE)
- [SDR 9JLA2021010828358](https://openairdocs.org/sdr/9JLA2021010828358), Dec 13, 2020: Beech 400A. TRANSPONDER. MALFUNCTIONED. IT WAS REPORTED FROM AIR TRAFFIC CONTROL (ATC) THAT THE AIRCRAFTS NR 1 TRANSPONDER SYSTEM WAS NOT TRANSMITTING MODE C ON (N480M)
- [SDR ABXA20200803206](https://openairdocs.org/sdr/ABXA20200803206), Nov 4, 2020: Boeing 767232. ANTENNA. BROKEN. TIP OF LOWER ATC ANTENNA FOUND BROKEN OFF. DEFERRED BY MAINTENANCE PROCEDURES. AIRCRAFT DEPARTED AND CREW HAD AN ATC FAU (N749AX)
- [SDR IKBR2020100500012](https://openairdocs.org/sdr/IKBR2020100500012), Oct 5, 2020: Cessna 172N. ANTENNA. DETERIORATED. DURING 50HR INSPECTION FOUND TRANSPONDER ANTENNA DETERIORATED AND CRACKED. INSTALLED NEW TRANSPONDER ANTENNA P/N AV-22. (N737LG)
- [SDR BKEA20200115001](https://openairdocs.org/sdr/BKEA20200115001), Jan 11, 2020: Gulstm GIV. CONTROL PANEL. MALFUNCTIONED. CONTROL PANEL WAS NOT SET TO DURING THE MONITORED FLIGHT. WE ALSO NOTED THAT WHEN THE CONTROL PANEL WAS SET, THE SYSTEM  (N719SA)
- [SDR DEMA20191231001](https://openairdocs.org/sdr/DEMA20191231001), Dec 30, 2019: Cessna 208B. TRANSPONDER. FAILED. ON FINAL APPROACH, NR 1 TRANSPONDER FAILED. WHILE PILOT WAS CHANGING TO NR 2 TRANSPONDER, THE NR 1 TRANSPONDER BEGAN TO  (N922FE)
- [SDR RU3A201912054067](https://openairdocs.org/sdr/RU3A201912054067), Dec 3, 2019: Beech 300BEECH. TRANSPONDER. FUMES. ACRID SMOKE IN CABIN AFTER START UP. AVIONIC ON & ENVIRONMENTAL ON. MX CONFIRMED #2 TRANSPONDER WAS SOURCE OF FUMES. REM (N67)
- [SDR CA190411003](https://openairdocs.org/sdr/CA190411003), Apr 10, 2019: Airbus BD5001A11. TRANSPONDER. INACCURATE. (CAN) BA SER CASE : 43929 SER - ATC COMPLAINED THAT XPDR WAS GIVING FL550 INSTEAD OF FL390 O CREW:XNDR#2 FAIL, ATC COMPL
- [SDR CA190329031](https://openairdocs.org/sdr/CA190329031), Mar 28, 2019: Cessna 208. TRANSPONDER. FAILED. (CAN) TRANSPONDER SMOKING IN FLIGHT. PILOT REMOVED ELECTRICAL POWER TO THE TRANSPONDER. (TC# 20190329031)
- [SDR 6GTA201812110009](https://openairdocs.org/sdr/6GTA201812110009), Dec 9, 2018: Piper PA46R350T. SOFTWARE. INCORRECT. AIRCRAFT G1000 SYSTEM SHOWED VERSION 17, BUT THERE WAS NO LOG ENTRY FOR APPLICATION OF SERVICE LETTER 1194. A SOFTWARE M (N2304D)
- [SDR FDEA201811273378](https://openairdocs.org/sdr/FDEA201811273378), Nov 27, 2018: Doug MD11F. TRANSPONDER. INOPERATIVE. AT 1 30 HRS INTO FLIGHT, RECEIVER LEVEL 1 TRANSPONDER 1 FAIL. SWITCHED TO TRANS 2 AND RECEIVED TRNSP 2 FAIL. BOTH TRANSP (N594FE)
- [SDR CA180223007](https://openairdocs.org/sdr/CA180223007), Feb 11, 2018: Airbus BD5001A11. TRANSPONDER. FAILED. (CAN) LOST RADAR CONTACT WITH ATC FOR ~ 15 MIN, AFTER SEVERAL XPDR - SWITCHING`S (ON - OFF/NR 1 - NR 2) AND DIFFERENT SQ
- [SDR DALA2017122108792](https://openairdocs.org/sdr/DALA2017122108792), Dec 20, 2017: Boeing 737932ER. CONTROL PANEL. FAILED. DURING TAXI OUT BOTH TRANSPONDERS 1 AND 2 FAILED. A BURNING ODOR WAS NOTED IN THE FLIGHT DECK WITH GPS LEFT FAILURE AND  (N878DN)
- [SDR 6CBA2017081517171](https://openairdocs.org/sdr/6CBA2017081517171), Aug 15, 2017: Pilats PC1247. TRANSPONDER. FAILED. ENROUTE, THE FLIGHT CREW REPORTED AN ELECTRICAL BURNING ODOR, POSSIBLY TRANSPONDER, ATC CONFIRMED THAT THEY WERE NOT REC (N877AF)
- [SDR FDEA201707071876](https://openairdocs.org/sdr/FDEA201707071876), Jul 7, 2017: Doug MD11F. COMPUTER. FAILED. GPWS FAILED WITH NOTICEABLE ELECTRICAL ODOR. NO SMOKE. CFDS SHOWS GPWC CURRENT FAULT 344507. FRONT FACE OF EPGWS HAS COM (N625FE)
- [SDR AALA20161229014](https://openairdocs.org/sdr/AALA20161229014), Dec 28, 2016: Boeing 737823. PANEL. CONTAMINATED. AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. JFK-CUN FLIGHT RETURNED TO JFK ACCOUNT SMOKE IN THE COCKPIT DURING CLIMBOUT.  (N916AN)
- [SDR AALA20161229013](https://openairdocs.org/sdr/AALA20161229013), Dec 28, 2016: Boeing 737823. PANEL. INOPERATIVE. AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. JFK-CUN FLIGHT RETURNED TO JFK ACCOUNT SMOKE IN THE COCKPIT DURING CLIMBOUT.  (N916AN)
- [SDR AALA20161228013](https://openairdocs.org/sdr/AALA20161228013), Dec 28, 2016: Boeing 737823. CONTROL PANEL. INOPERATIVE. AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. JFK-CUN FLIGHT RETURNED TO JFK ACCOUNT SMOKE IN THE COCKPIT DURING CLIMBOUT.  (N916AN)
- [SDR AXSA 991 10/14/16](https://openairdocs.org/sdr/AXSA%20991%2010%2F14%2F16), Oct 14, 2016: Cessna 208B. TRANSPONDER. FAILED. THE PILOT REPORTED SMELLING SOMETHING HOT FOLLOWED BY TRANSPONDER NR 1 BECOMING INOPERATIVE. THE PILOT PULLED THE APPROP (N991FX)
- [SDR AXSA201609290001](https://openairdocs.org/sdr/AXSA201609290001), Sep 29, 2016: Cessna 208B. TRANSPONDER. FAILED. NR ONE TRANSPONDER FAILED WITH A PUFF OF SMOKE, PILOT TURNED UNIT OFF AND PULLED BREAKER. (N931FE)
- [SDR 2016FA0000457](https://openairdocs.org/sdr/2016FA0000457), Sep 27, 2016: Cessna 206H. TRANSPONDER. SMOKE. SMOKE FROM TRANSPONDER ON APPROACH FOLLOWED BY FAILED MASSAGE. SHORTLY AFTER SCREEN WENT BLACK. (N3518)
- [SDR AALA20160422003](https://openairdocs.org/sdr/AALA20160422003), Apr 22, 2016: Boeing 777223. CONTROL PANEL. FAULTY. AIRCRAFT WAS GNDED. AIR INTERRUPT, EMER NOT DECLARED, LANDING UNEVENTFUL & ACFT NOT OVERWEIGHT. DURING CRUISE BOTH LT &  (N760AN)
- [SDR COEA2016040101940](https://openairdocs.org/sdr/COEA2016040101940), Apr 1, 2016: Cessna 208B. TRANSPONDER. SMOKE. FLIGHT 8695 LOG PAGE 160808. COMPONENT SMOKE ON DOWNWIND TO LANDING. SMOKE WAS OBSERVED COMING FROM NR 1 TRANSPONDER & B (N940FE)
- [SDR AXSA20151217001](https://openairdocs.org/sdr/AXSA20151217001), Dec 16, 2015: Cessna 208B. TRANSPONDER. FUMES. PILOT REPORTED BURNING SMELL IN COCKPIT. (N780FE)
- [SDR CA151212003](https://openairdocs.org/sdr/CA151212003), Dec 12, 2015: Cessna 172M. TRANSPONDER. FAILED. (CAN) TRANSPONDER FAILED TEST DURING BIANNUAL TEST. UNIT FAILED FREQUENCY TEST UPON CORRELATION CHECK, UNIT WAS REPAIRED
- [SDR AWKA20151204001](https://openairdocs.org/sdr/AWKA20151204001), Oct 29, 2015: Bombdr BD1001A10. TRANSPONDER. FAILED. ON DEPARTURE, DEPARTURE CONTROL ASKED THE FLIGHT CREW TO ENSURE THE TRANSPONDER WAS ON & SQUAWKING 3612. THE CREW THEN R (N550XJ)
- [SDR CA150914001](https://openairdocs.org/sdr/CA150914001), Aug 30, 2015: Bombdr DHC8402. TRANSPONDER. UNKNOWN. (CAN) ATC FAILURE ON AUG 30TH, 2015. THE TIME-SERIES OF ATB EVENT IS AS FOLLOWS, ATC GROUND STATION CONFIRMED THAT NO RA
- [SDR BKEA20150819](https://openairdocs.org/sdr/BKEA20150819), Aug 19, 2015: Gulstm 200. TRANSPONDER. MALFUNCTIONED. JUST AFTER TAKEOFF WE RECEIVED "RT T/R INOPERATIVE" CASS MESSAGE AND ATC REPORTED THAT THEY DIDN'T HAVE OUR TRANSPONDER. (N236LC)
- [SDR DALA2015080504798](https://openairdocs.org/sdr/DALA2015080504798), Aug 4, 2015: Boeing 737832. TRANSPONDER. SMOKE. DURING FLIGHT THE FLIGHT CREW NOTICED LIGHT SMOKE COMING FROM THE ATC TRANSPONDER PANEL IN THE COCKPIT. SWITCHED PANEL T (N372DA)
- [SDR AXSA20150722001](https://openairdocs.org/sdr/AXSA20150722001), Jun 30, 2015: Emb EMB110P1. TRANSPONDER. SMOKE. PILOT REPORTED SMOKE COMING FROM BEHIND TRANSPONDER. (N119WA)
- [SDR CA150526001](https://openairdocs.org/sdr/CA150526001), May 22, 2015: Cessna 172N. TRANSPONDER. SMOKE. (CAN) DURING TAXI OF ACFT, SMOKE WAS NOTICED COMING OUT FROM FACE OF TRANSPONDER. ACFT WAS SHUTDOWN & MAIN BASE NOTIFIED
- [SDR QMLA2014121414139](https://openairdocs.org/sdr/QMLA2014121414139), Dec 14, 2014: Bolkms BK117B1. TRANSPONDER. MALFUNCTIONED. THE PILOT DETECTED AN ELEC BURNING SMELL IN THE COCKPIT ON APPROACH. ONCE ON THE GND, HE CALLED IN THE MECHANIC TO INSPE (N156AM)
- [SDR CALA2014060291180](https://openairdocs.org/sdr/CALA2014060291180), May 30, 2014: Boeing 777222. WARNING SYSTEM. FALSE ACTIVATION. LOWER EICAS HAS ATC MODE S TRANSPONDER & RT MX MSG 34-49995. RESET SYS & ACCOMPLISHED TRANSPONDER OPERATION CHECK IAW MM (N797UA)
- [SDR CALA2014021290367](https://openairdocs.org/sdr/CALA2014021290367), Feb 12, 2014: Boeing 757222. SWITCH. FAULTY. TRANSPONDER LT & RT FAILED. REPLACED TOP ANTENNA COAXIAL SWITCH S10563 IAW AMM 34-53-04,PG401 & 34-53-00, PG501. BOTH AT (N590UA)
- [SDR HNAA2014021200040](https://openairdocs.org/sdr/HNAA2014021200040), Feb 12, 2014: Dhav DHC8102. DADC. FAILED. BOTH TRANSPONDERS ARE INOPERATIVE. R & R NR 1 DADC. SYSTEM CHECKS GOOD IAW AMM 34-12-02 AND SB 34-68. (N935HA)
- [SDR O2GA2014022680601](https://openairdocs.org/sdr/O2GA2014022680601), Feb 6, 2014: Beech B300. TRANSPONDER. MALFUNCTIONED. AIRCRAFT DEPARTED, CREW SWITCHED THE NR 1 TRANSPONDER FREQUENCY FROM TOWER TO DEPARTURE & WAS NOTIFIED THAT THEIR TRANSP (N806UP)

All 624: https://openairdocs.org/jasc/3452/reports.md

## Other codes in chapter 34

- [JASC 3400](https://openairdocs.org/jasc/3400): Navigation System (692 reports)
- [JASC 3410](https://openairdocs.org/jasc/3410): Flight Environment Data (218 reports)
- [JASC 3411](https://openairdocs.org/jasc/3411): Pitot/Static System (1,586 reports)
- [JASC 3412](https://openairdocs.org/jasc/3412): Outside Air Temperature Indicator/Sensor (254 reports)
- [JASC 3413](https://openairdocs.org/jasc/3413): Rate of Climb Indicator (157 reports)
- [JASC 3414](https://openairdocs.org/jasc/3414): Airspeed/Mach Indicator (860 reports)
- [JASC 3415](https://openairdocs.org/jasc/3415): High Speed Warning (39 reports)
- [JASC 3416](https://openairdocs.org/jasc/3416): Altimeter, Barometric/Encoder (1,256 reports)
- [JASC 3417](https://openairdocs.org/jasc/3417): Air Data Computer (1,210 reports)
- [JASC 3418](https://openairdocs.org/jasc/3418): Stall Warning System (1,641 reports)
- [JASC 3420](https://openairdocs.org/jasc/3420): Attitude and Direction Data System (772 reports)
- [JASC 3421](https://openairdocs.org/jasc/3421): Attitude Gyro and Indicating System (1,142 reports)
- [JASC 3422](https://openairdocs.org/jasc/3422): Directional Gyro and Indicating System (649 reports)
- [JASC 3423](https://openairdocs.org/jasc/3423): Magnetic Compass (101 reports)
- [JASC 3424](https://openairdocs.org/jasc/3424): Turn and Bank/Rate of Turn Indicator (153 reports)
- [JASC 3425](https://openairdocs.org/jasc/3425): Integrated Flight System (1,148 reports)
- [JASC 3430](https://openairdocs.org/jasc/3430): Landing and Taxi Aids (56 reports)
- [JASC 3431](https://openairdocs.org/jasc/3431): Localizer/VOR System (129 reports)
- [JASC 3432](https://openairdocs.org/jasc/3432): Glide Slope System (66 reports)
- [JASC 3433](https://openairdocs.org/jasc/3433): Microwave Landing System (26 reports)
- [JASC 3434](https://openairdocs.org/jasc/3434): Marker Beacon System (27 reports)
- [JASC 3435](https://openairdocs.org/jasc/3435): Heads Up Display System (10 reports)
- [JASC 3436](https://openairdocs.org/jasc/3436): Wind Shear Detection System (70 reports)
- [JASC 3440](https://openairdocs.org/jasc/3440): Independent Position Determining System (261 reports)
- [JASC 3441](https://openairdocs.org/jasc/3441): Inertial Guidance System (289 reports)
- [JASC 3442](https://openairdocs.org/jasc/3442): Weather Radar System (3,442 reports)
- [JASC 3443](https://openairdocs.org/jasc/3443): Doppler System (110 reports)
- [JASC 3444](https://openairdocs.org/jasc/3444): Ground Proximity System (552 reports)
- [JASC 3445](https://openairdocs.org/jasc/3445): Air Collision Avoidance System (214 reports)
- [JASC 3446](https://openairdocs.org/jasc/3446): Non Radar Weather System (23 reports)
- [JASC 3450](https://openairdocs.org/jasc/3450): Dependent Position Determining System (106 reports)
- [JASC 3451](https://openairdocs.org/jasc/3451): DME/TACAN System (197 reports)
- [JASC 3453](https://openairdocs.org/jasc/3453): Long-Range Navigation (LORAN) System (175 reports)
- [JASC 3454](https://openairdocs.org/jasc/3454): Visual Omnirange (VOR) System (317 reports)
- [JASC 3455](https://openairdocs.org/jasc/3455): Automatic Direction Finder (ADF) System (164 reports)
- [JASC 3456](https://openairdocs.org/jasc/3456): Omega Navigation System (9 reports)
- [JASC 3457](https://openairdocs.org/jasc/3457): Global Positioning System (635 reports)
- [JASC 3460](https://openairdocs.org/jasc/3460): Flight Management Computing Hardware System (4,690 reports)
- [JASC 3461](https://openairdocs.org/jasc/3461): Flight Management Computing Software System (68 reports)
- [JASC 3497](https://openairdocs.org/jasc/3497): Navigation System Wiring (269 reports)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.