# JASC 3431: Localizer/VOR System

- Type: JASC system/component code (FAA)
- ATA chapter: 34 Navigation
- Title in the code table: LOCALIZER/VOR SYSTEM
- Service difficulty reports: 129
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=38
- Page: https://openairdocs.org/jasc/3431

## What it covers

The electronic portion of an instrument landing system (ILS) that indicates the centerline of the runway to the pilot. For reports on localizer/very high frequency omni range (VOR) systems. Typical parts are receiver, antenna, indicator, circuit breaker, switch, antenna coax, etc.

## Service difficulty reports (129, newest 50)

- [SDR CALA2026091519455](https://openairdocs.org/sdr/CALA2026091519455), Sep 1, 2026: Boeing 7379. ANTENNA. DAMAGED. BIRD STRIKE ON CLIMBOUT APROX 3000 FT PERFORMED INITIAL EVALUATION IAW AMM TASK 05-51-18. FOUND EXTERNAL DAMAGE IN NOSE  (N27404)
- [SDR DALA2026082004757](https://openairdocs.org/sdr/DALA2026082004757), Aug 17, 2026: Boeing 717200. LOCALIZER. FAULTED. FOUND A NON-COMPLIANCE ISSUE RELATED TO SATELLITE-BASED AUGMENTATION SYSTEM (SBAS) MESSAGE TYPE 6, COMPLIED WITH ER/A 63 (N967AT)
- [SDR CALA2026072017894](https://openairdocs.org/sdr/CALA2026072017894), Jul 17, 2026: Airbus A319131. ILS SYSTEM. FAULTED. NAV LS TUNING DISAGREE SYSTEM RESET DIDNT WORK INFLIGHT FAULT WAS NOT PRESENT ON ARRIVAL. VERIFIED FREQUENCIES ON LS WER (N803UA)
- [SDR QXEA2026070600149](https://openairdocs.org/sdr/QXEA2026070600149), Jun 28, 2026: Emb ERJ170200LR. ILS SYSTEM. FAULTED. FLIGHT 2126. ILS MISSED APPRAOCH DUE TO CAPTAINS SIDE LOC NO CAPTURING. SOURCED FO SIDE FO FLOWN NORMAL. ON LANDING MAST (N670QX)
- [SDR DALA2026030201422](https://openairdocs.org/sdr/DALA2026030201422), Feb 15, 2026: Boeing 717200. ILS SYSTEM. UNRELIABLE. ILS IS SOMEWHAT NOT RELIABLE, THEREFORE, AN STC FOR "ILS LOOK-ALIKE" LPV IS BEING DEVELOPED AS A BACK UP FOR ILS. ACCOMP (N967AT)
- [SDR UIEA2025080801109](https://openairdocs.org/sdr/UIEA2025080801109), Aug 8, 2025: Boeing 7673S1. CONTROL PANEL. INTERMITTENT. ILS COURSE KNOB INTERMITTANT. REPLACED ILS CONTROL PANEL. PERFORMED OPS CHECK, TEST OK IAW AMM 34-31-02. AIPC REF. 34-32 (N640GT)
- [SDR AALA202504170737](https://openairdocs.org/sdr/AALA202504170737), Apr 14, 2025: Boeing 7378. ANTENNA. FAULTED. AIRCRAFT WAS GROUNDED: REPEAT RECURRING ISSUE WITH GEAR WARNING HORN GOES OFF WHEN THROTTLES PULLED BACK, ALONG WITH 3 R (N300UB)
- [SDR AALA202504175893](https://openairdocs.org/sdr/AALA202504175893), Apr 14, 2025: Boeing 7378. ANTENNA. FAULTED. AIRCRAFT WAS GROUNDED: REPEAT RECURRING ISSUE WITH GEAR WARNING HORN GOES OFF WHEN THROTTLES PULLED BACK, ALONG WITH 3 R (N300UB)
- [SDR HNAA2025031700187](https://openairdocs.org/sdr/HNAA2025031700187), Mar 16, 2025: Emb EMB145LR. RADIO ALTIMETER. ABNORMAL. ON DESCENT FROM 15,000FT HAD MULTIPLE CONSTANT GPWS CALL OUT S THAT WOULD NOT STOP. DID NOT CLEAR UNTIL ROUGHLY 2,000FT  (N691AE)
- [SDR HNAA2025031700186](https://openairdocs.org/sdr/HNAA2025031700186), Mar 16, 2025: Emb EMB145LR. RADIO ALTIMETER. ABNORMAL. ON DESCENT FROM 15,000FT HAD MULTIPLE CONSTANT GPWS CALLS OUT THAT WOULD NOT STOP. DID NOT CLEAR UNTIL ROUGHLY 2,000FT W (N691AE)
- [SDR DALA2024120911524](https://openairdocs.org/sdr/DALA2024120911524), Dec 6, 2024: Boeing 737832. TRANSCEIVER. INOPERATIVE. SHIP 3740 -DIV- DIVERTED TO PVU (PROVO, UTAH) DUE TO LOSS OF CAPTAIN'S ILS, FD AND HUD ON APPROACH SLC DURING CAT 3 OPER (N3740C)
- [SDR AALA202410041357](https://openairdocs.org/sdr/AALA202410041357), Oct 2, 2024: Boeing 737823. ANTENNA. INOPERATIVE. AIRCRAFT WAS GROUNDED: SELECTED APPROACH MODE FOR THE ILS 25L AT LAX. LOC STARTED TO CAPTURE WHEN WE LOST BOTH FLIGHT DI (N806NN)
- [SDR DALA2023120409921](https://openairdocs.org/sdr/DALA2023120409921), Dec 4, 2023: Airbus A319114. UNKNOWN. UNKNOWN. SHIP 3127 -DIV- TO IND DUE TO ILS TUNING ISSUE ON APPROACH TO DTW. FMGC RESET WAS NO HELP. CORRECTIVE ACTION: COULD NOT  (N327NB)
- [SDR OEJA202301240001](https://openairdocs.org/sdr/OEJA202301240001), Jan 19, 2023: Raythn 400ARAYTHEON. LOCALIZER. FAULTED. UPON ARRIVAL AT CRE WEATHER WAS REPORTING VV 200 AND LESS THAN 1/4 MILES VIS. OUR LOCALIZER WAS INOP AND WE HAD A NEW CA (N436FL)
- [SDR OEJA2023012000027](https://openairdocs.org/sdr/OEJA2023012000027), Jan 19, 2023: Beech 400A. ILS SYSTEM. FAULTED. UPON ARRIVAL AT CRE WEATHER WAS REPORTING VV 200 AND LESS THAN 1/4 MILES VIS. OUR LOCALIZER WAS INOP AND WE HAD A NEW CA (N436FL)
- [SDR HNAA2022111400302](https://openairdocs.org/sdr/HNAA2022111400302), Nov 12, 2022: Emb EMB145LR. LOCALIZER. FAULTED. BOTH LOCALIZER SIGNALS UNRELIABLE ON APPROACH TO FWA. DIVERTED TO DAY. PERFORMED VOR/ILS SYSTEM OPERATIONAL TEST IAW AMM (N683AE)
- [SDR ASAA2022050838309](https://openairdocs.org/sdr/ASAA2022050838309), May 8, 2022: Boeing 737890. WIRE. LOOSE. REF ASA L/P 60350724 ASA W/O 1906761 - DURING FMCS OPS CHECK FOUND FMCS #1 FAULTING LEFT MMR FOR 9 CONSECUTIVE LEGS. GRO (N586AS)
- [SDR ASAA2022042238105](https://openairdocs.org/sdr/ASAA2022042238105), Apr 22, 2022: Boeing 7379. VOR SYSTEM. FAILED. WEATHER RADAR DOES NOT WORK IN FLIGHT. ON BOTH NDS WXR FAIL IS ILLUMINATED AND THE RADAR WILL NOT TEST. GROUNDED - YES.  (N933AK)
- [SDR HNAA2022020900069](https://openairdocs.org/sdr/HNAA2022020900069), Feb 7, 2022: Emb EMB145LR. NOT REPORTED. NOT REPORTED. PDIS 649 34-32 2749062 07FEB22 CLT CLOSE ON APPROACH TO FAY, BOTH LOC DROPPED OFF WITH RED X ACROSS CDI, SIGNAL WAS VERY (N649PP)
- [SDR SWIA202163261](https://openairdocs.org/sdr/SWIA202163261), Dec 28, 2021: Cndair CL6002B19. NONE. UNRELIABLE. D: DUE TO ODI EVENT THIS ACFT REQUIRES SR. MANAGEMENT APPROVAL TO BE RETURNED TO SERVICE / C: MCI / UNRELIABLE LOCALIZER (N973SW)
- [SDR YENA2021111000746](https://openairdocs.org/sdr/YENA2021111000746), Nov 3, 2021: Emb ERJ190100IGW. ANTENNA. FAILED. FLT 2618, FLL-JAX(AIR TURN BACK). LANDING GEAR WARNING ANNUNCIATED WITH GEAR UP AT 5000 DURING THE CLIMB. THE WARNING CO (N339JB)
- [SDR HNAA2021022500060](https://openairdocs.org/sdr/HNAA2021022500060), Feb 22, 2021: Emb EMB145LR. LOCALIZER. MALFUNCTIONED. PDIS 669 34-32 2433662 22FEB21 ORF CLOSE LOC WAS ERRONEOUS ON BOTH SIDES FACT 22FEB21 23:45 ROA. PERFORMED VOR/ILS/LOC O (N669MB)
- [SDR HNAA2021021500053](https://openairdocs.org/sdr/HNAA2021021500053), Feb 13, 2021: Emb EMB145LR. LOCALIZER. ERRATIC. PDIS 631 34-32 2353451 13FEB21 MDT CLOSE LOCALIZER ERRATIC 12 MILES FROM CHO. GOT WORSE THE CLOSER TO RUNWAY 3. AUTO PIL (N631AE)
- [SDR CALA2020120201317](https://openairdocs.org/sdr/CALA2020120201317), Dec 2, 2020: Boeing 737824. SWITCH. INOPERATIVE. ON APPROACH KSEA LOC ON CAPT SIDE ID AND LOC INTERMITTENT AND AUTO PILOT DID NOT CAPTURE UPDATE PER CAPT: WITH A/P A ENG (N33286)
- [SDR FDEA202005080915](https://openairdocs.org/sdr/FDEA202005080915), May 8, 2020: Boeing 7673S2F. UNKNOWN. MALFUNCTIONED. PDIS 153 22-10 2040 08MAY20 LAX FACT U LOGPAGES:3179707 DURING ILS 25L AT KLAX THE FLIGHT DIRECTOR ERRONEOUSLY DIRECTED  (N153FE)
- [SDR AALA2020043099002](https://openairdocs.org/sdr/AALA2020043099002), Apr 28, 2020: Boeing 777323ER. MODULE. FAULTY. AIRCRAFT NOT GROUNDED: ON NATA BETWEEN 58N040W AND 57N050W AT AOORIX 15002, THE ROLL WINDOW OF THE FMA WENT BLANK. THE L (N727AN)
- [SDR AALA201905209004](https://openairdocs.org/sdr/AALA201905209004), May 19, 2019: Boeing 737823. UNKNOWN. MALFUNCTIONED. AIRCRAFT NOT GROUNDED: PILOT REPORTED THAT THREE HOURS INTO THE FLIGHT, AMBER VOR 2 FAILURE FLAG APPEARED ON BOTH CA AND (N806NN)
- [SDR RAIA201812270001](https://openairdocs.org/sdr/RAIA201812270001), Dec 27, 2018: Emb EMB145XR. LOCALIZER. MALFUNCTIONED. LOCALIZER NR 1 AND NR 2 UNRELIABLE AT LAN. LOC NEEDLE WOULD DEFLECT FULL LEFT TO RIGHT INTERMITTENTLY WITHIN 10 MILES TO (N17138)
- [SDR AALA201810049001](https://openairdocs.org/sdr/AALA201810049001), Sep 28, 2018: Boeing 737823. RECEIVER. FAULTY. MIA FLT 1182 EN-ROUTE GUA - MIA. THE AIRCRAFT WAS NOT GROUNDED. AROUND 1500 SHORT FINAL RUNWAY 9 MIA, AUTOPILOT ENGAGED, (N959NN)
- [SDR ASAA2018092426219](https://openairdocs.org/sdr/ASAA2018092426219), Sep 20, 2018: Boeing 737990ER. RECEIVER. FAILED. AFTER LANDING WHILE TAXIING IN, INTERMITTENT VTK FLAG ON RT SIDE MFD. GROUNDED - YES. VERIFIED FAULT, RT FMC CYCLES ON & (N481AS)
- [SDR IPXA2018091433966](https://openairdocs.org/sdr/IPXA2018091433966), Sep 8, 2018: Airbus A300F4622R. MMR. NOT SEATED. DIVERSION DUE TO ILS SYSTEM NR 1 & NR 2. RESEATED NR 1 & NR 2 MMR NR 1 & NR 2 ILS SYSTEM OPS CHECKS GOOD IAW AMM 34-36-0 (N148UP)
- [SDR HALA2018081400377](https://openairdocs.org/sdr/HALA2018081400377), Aug 13, 2018: Boeing 76733A. WARNING MESSAGE. FALSE ACTIVATION. NO LAND 3 FLAG ON AUTO LAND STATUS APPEARED JUST PAST ETP. WOULD NOT RESET. PERFORMED ILS OPERATIONAL TESTS IAW AMM 34-3 (N581HA)
- [SDR IPXA2018011225417](https://openairdocs.org/sdr/IPXA2018011225417), Jan 10, 2018: Boeing 76734AF. ILS SYSTEM. INOPERATIVE. FIRST OFFICER ILS GLIDE SLOPE INOPERATIVE. NO AUTOLAND POPPED UP WHEN SELECTING APPROACH MODE ON MCP. SHOT TWO ILS, BOTH (N334UP)
- [SDR CA150807002](https://openairdocs.org/sdr/CA150807002), Aug 6, 2015: Boeing 777233LR. RADAR. FAILED. (CAN) 12NM OUT ON LOCALIZER 08L, ACFT STARTED WEAVING. FOUND LT RADAR GAIN AT MAX. RIGHT GAIN AT CAL. RETURNED LEFT TO C
- [SDR ASMF201510200001](https://openairdocs.org/sdr/ASMF201510200001), Aug 5, 2015: Boeing 737800*. WARNING SYSTEM. FALSE ACTIVATION. AIRCRAFT RETURNED TO PLATFORM DUE TO, AFTER START ENGINES THE ILS & GLS LIGHTS TURNED ON IN THE IRS DISPLAY PANEL WHEN M (N957AM)
- [SDR RAIA201504130001](https://openairdocs.org/sdr/RAIA201504130001), Apr 13, 2015: Emb EMB145LR. LOCALIZER. MALFUNCTIONED. NR 1 AND NR 2 DID NOT PICKUP STANDARD APPROACH, REPORTED 4 MILES OFF COURSE. MAINTENANCE REMOVED BOTH VOR ANTENNAS AND I (N836HK)
- [SDR SWIA2014112540162](https://openairdocs.org/sdr/SWIA2014112540162), Nov 23, 2014: Cndair CL6002C10. RECEIVER. FAULTY. LOCALIZER RECEIVERS FAIL INTERMITTENTLY. R & R NR 1 AND 2 VIR-432 IAW AMM. (N703SK)
- [SDR SWIA201439252](https://openairdocs.org/sdr/SWIA201439252), Sep 6, 2014: Cndair CL6002B19. LOCALIZER. INTERMITTENT. DURING APPROACH, THE CAPTAIN`S LOCALIZER WAS SEVERELY INTERMITTENT. ATC HAD THE ACFT GO AROUND AND REALIGN TO CAPTURE TH (N929SW)
- [SDR CALA2014071191413](https://openairdocs.org/sdr/CALA2014071191413), Jul 5, 2014: Airbus A320232. ILS SYSTEM. FAULTED. ILS 2 FAULT DISPLAYED ON UPPER ECAM SCREEN. ACCOMPLISHED CHRONIC REVIEW. ACCOMPLISHED MT 34-001. OPERATIONS CHECKED GOOD (N481UA)
- [SDR COZA20140416041](https://openairdocs.org/sdr/COZA20140416041), Apr 13, 2014: Boeing 7377BX. CONTROL PANEL. INTERMITTENT. NR 2 VOR NAVIGATION PANEL INTERMITTENTLY DISPLAYED INCORRECT NUMBERS IN THE ACTIVE FREQUENCY WINDOW, THOUGH THE PANEL, W (N737KA)
- [SDR COZA20140320039](https://openairdocs.org/sdr/COZA20140320039), Mar 16, 2014: Boeing 7377BX. DISPLAY. INOPERATIVE. NR 2 VOR NAVIGATION DISPLAY WENT BLANK. REPLACED DISPLAY AND OPS CHECK NORMAL. (N737KA)
- [SDR CALA2014011490149](https://openairdocs.org/sdr/CALA2014011490149), Jan 14, 2014: Boeing 757222. ILS SYSTEM. INOPERATIVE. UNABLE TO CLEAR NO LAND 3 ON ASA, LT ILS INOPERATIVE. (N512UA)
- [SDR CHQA20130409107](https://openairdocs.org/sdr/CHQA20130409107), Apr 9, 2013: Emb EMB145LR. ANTENNA. FAULTY. DURING APPROACH, CREW REPORTED ILS 1 AND 2 ERRATIC. THE CREW DIVERTED AND LANDED WITHOUT INCIDENT. ILS 1 AND 2 WERE PLAC (N289SK)
- [SDR CHQA20130227068](https://openairdocs.org/sdr/CHQA20130227068), Feb 27, 2013: Emb EMB145LR. ILS SYSTEM. ERRATIC. CREW REPORTED THAT DURING FLIGHT, BOTH LOCALIZERS BECAME ERRATIC, CLOSED THE AIRCRAFT GOT TO THE STATION. THE CREW DIVER (N579RP)
- [SDR CHQA20130227067](https://openairdocs.org/sdr/CHQA20130227067), Feb 27, 2013: Emb EMB145LR. ILS SYSTEM. ERRATIC. CREW REPORTED THAT DURING FLIGHT, BOTH LOCALIZERS BECAME ERRATIC THE CLOSED THE AIRCRAFT GOT TO THE STATION. THE CREW DI (N579RP)
- [SDR USAA2012110700005](https://openairdocs.org/sdr/USAA2012110700005), Nov 3, 2012: Boeing 7374B7. RECEIVER. FAULTY. CREW REPORTED THE AIRCRAFT PITCHED NOSE UP AND CLIMBED TO 300 FEET BEFORE WE DISCONNECTED THE AUTO PILOT. THIS OCCURRED  (N434US)
- [SDR UALA2012080904334](https://openairdocs.org/sdr/UALA2012080904334), Aug 8, 2012: Boeing 757222. RECEIVER. MALFUNCTIONED. NO LAND 3 LIGHT WITH ACRID ODOR IN COCKPIT AND THROUGHOUT CABIN STRONGER IN 1ST CLASS. FOUND CTR ILS RECEIVER SMOKED. (N522UA)
- [SDR FDEA201207032604](https://openairdocs.org/sdr/FDEA201207032604), Jul 3, 2012: Doug MD1010F. MOTOR. CRACKED. LEVEL 2 HYD 3 FAIL. R & R INBD STABILIZER TRIM MOTOR IAW AMM 27-43-01-2, OPS AND LEAK CHECKED GOOD, OK FOR SERVICE. (N566FE)
- [SDR CA120117003](https://openairdocs.org/sdr/CA120117003), Jan 15, 2012: Dhav DHC8102. LOCALIZER. MALFUNCTIONED. (CAN) CAPTAIN LOCALIZER OUT 1 DEGREE ON APPROACH LT OF CENTERLINE. TEST WERE CARRIED OUT AND FOUND THE NR 1 NAV RECEIVER
- [SDR UALA2011081004206](https://openairdocs.org/sdr/UALA2011081004206), Aug 9, 2011: Boeing 757222. RECEIVER. MALFUNCTIONED. CTR ILS FAULT. CTR AND RT ILS RECEIVERS SWAPPED. (N546UA)

All 129: https://openairdocs.org/jasc/3431/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 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 3452](https://openairdocs.org/jasc/3452): ATC Transponder System (624 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)

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