# JASC 3451: DME/TACAN System

- Type: JASC system/component code (FAA)
- ATA chapter: 34 Navigation
- Title in the code table: DME/TACAN SYSTEM
- Service difficulty reports: 197
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=40
- Page: https://openairdocs.org/jasc/3451

## What it covers

The systems which measures time-to-station, ground speed, and distance to a known transmitter location by transmitting and receiving electronic pulse signals (i.e., distance measuring equipment - DME; ultra high frequency tactical air navigational aid - TACAN). Typical parts are antenna, control unit, transceiver, coaxial cables, etc.

## Service difficulty reports (197, newest 50)

- [SDR UIEA2025052100654](https://openairdocs.org/sdr/UIEA2025052100654), May 21, 2025: Boeing 76731B. ANTENNA. DAMAGED. LEFT DME ANTENNA DAMAGE.(<P>REPLACED LEFT DME ANTENNA LOWER FUSELAGE &AMP; PERFORMED OPERATIONAL TEST, TEST OK IAW B767  (N664GT)
- [SDR UIEA2025052100655](https://openairdocs.org/sdr/UIEA2025052100655), May 21, 2025: Boeing 76731B. ANTENNA. DAMAGED. RIGHT DME ANTENNA DAMAGED.(<P>REPLACED RIGHT DME ANTENNA LOWER FUSELAGE &AMP; PERFORMED OPS TEST, TEST OK IAW B767 AMM 3 (N664GT)
- [SDR UIEA2024060700500](https://openairdocs.org/sdr/UIEA2024060700500), Jun 7, 2024: Boeing 7673Y0. CONTROL PANEL. FAULTED. FO SIDA UNABLE TO TURN VOR EMERGENCYIN MANUAL MODE(<P>REMOVED AND REPLACED VOR CONTROL PANEL IAW AMM 34-51-02. NO DEFECT (N642GT)
- [SDR M17F202311010001](https://openairdocs.org/sdr/M17F202311010001), Aug 13, 2023: Boeing 737852. TCAS SYSTEM. UNSERVICEABLE. TCAS FAIL FLAG ON NAVIGATION DISPLAY SHOWS WITH ATC TRANSPONDER SELECTOR AT TA AND SHOWS WITH SELECTOR AT TA/RA FRM 3443 (N825AM)
- [SDR DALA2023013000748](https://openairdocs.org/sdr/DALA2023013000748), Jan 29, 2023: Boeing 757232. DME. FAILED. SHIP 650 SMOKE AND FUMES COCKPIT E11 CB POPPED. CORRECTIVE ACTION: FOUND DME 1 INTERROGATOR BAD-R/R NO 1 DME PER B757 AM (N650DL)
- [SDR UIEA2022050600434](https://openairdocs.org/sdr/UIEA2022050600434), May 6, 2022: Boeing 76738E. CONTROL PANEL. UNSERVICEABLE. CAP VOR/DME TUNER CRS KNOB IS SKIPPING NUMBERS ON DISPLAY GOING FROM 120 TO 247 TO 132 AS EXAMPLES. REMOVED & REPLACED C (N641GT)
- [SDR CALA2022021600404](https://openairdocs.org/sdr/CALA2022021600404), Feb 16, 2022: Boeing 737724. STRAP. LOOSE. BOTH NAV1 AND NAV2 SHOW FAIL. NAV1 THRU 10K FT NAV2 15 MIN LATER TS PER FIM 22-15-00 TASK 813. MULTIPLE FAULTS FOUND DUR (N16709)
- [SDR UIEA2020100732155](https://openairdocs.org/sdr/UIEA2020100732155), Oct 3, 2020: Boeing 767375. ANTENNA. FAILED. LEFT AND RIGHT DME INOPERABLE P/N DM 1601354-001. REMOVED AND REPLACED DME RT INTERROGATOR M124, OPS CHECK OK AMM 34-55- (N649GT)
- [SDR BEMA20200618001](https://openairdocs.org/sdr/BEMA20200618001), Jun 10, 2020: Beech 6580. DME. FAILED. PILOT REPORTED SMOKE IN COCKPIT AND MADE AN UNSCHEDULED LANDING SAFELY AT ALTERNATE AIRPORT. UPON INVESTIGATION IT WAS F (N135BA)
- [SDR RAIA2019121980023](https://openairdocs.org/sdr/RAIA2019121980023), Dec 8, 2019: Emb EMB145XR. HOUSING. CORRODED. MAIN CABIN LOWER BELLY DME 2 ANTENNA HOUSING HAS CORROSION BETWEEN FR 27 & 28 @ STR 20 & 21RH- R/R MAIN CABIN LOWER BELL (N11113)
- [SDR FDEA201909102198](https://openairdocs.org/sdr/FDEA201909102198), Sep 10, 2019: Boeing 757236. CONTROL PANEL. BURNED. IN CRUISE, FIRST OFFICER SMELLED AND SAW SMOKE COMING OUT OF REAR OF NUMBER 2 VOR/DME BOX. THE AUTO/MAN SWITCH HAD BEEN  (N946FD)
- [SDR DALA2019082634965](https://openairdocs.org/sdr/DALA2019082634965), Aug 22, 2019: Boeing 7572Q8. INTERROGATOR. FAILED. LEFT DME CIRCUIT BREAKER POPPED. FOLLOWED BY ACRID SMELL IN COCKPIT. REMOVED AND REPLACED DME INTERROGATOR PER B757 AMM  (N713TW)
- [SDR 2017FA0000617](https://openairdocs.org/sdr/2017FA0000617), Dec 4, 2017: DME. SHORTED. DURING CRUISE FLIGHT AT FL260 SMOKE WAS OBSERVED COMING FROM THE RIGHT AFT AVIONICS COMPARTMENT. PILOT DECLARED AN EMERG
- [SDR IPXA2017053017725](https://openairdocs.org/sdr/IPXA2017053017725), May 30, 2017: Boeing 76734AF. CONTROL PANEL. SMOKE. ENROUTE, NOTICED ELECTRICAL FIRE ODOR BRIEFLY. ODOR OF SMOKE FROM TRANSPONDER. SMOKE STOPPED AND ODOR DISRUPTED. NO ISSU (N350UP)
- [SDR HALA2014121300211](https://openairdocs.org/sdr/HALA2014121300211), Dec 13, 2014: Boeing 76733A. IRU. MALFUNCTIONED. CENTER IRS FAULT. REPLACED CENTRAL IRU IAW MM 34-21-01, LMP MCDP TEST 30 PERFORMED AND PASS - GROUND CHECK GOOD, OK FOR  (N589HA)
- [SDR SIMA20140818001](https://openairdocs.org/sdr/SIMA20140818001), Aug 18, 2014: Emb EMB145LR. DME. FAILED. DURING THE CLIMB OUT THE CREW WAS ALERTED TO A NAV 2 FAIL. THEY FOLLOWED THE GUIDANCE OF THE AOM-1 & MEL BOOK. THEY NOTI (N667GB)
- [SDR ASMF201409007](https://openairdocs.org/sdr/ASMF201409007), Aug 15, 2014: Boeing 73776Q. TRANSCEIVER. DAMAGED. CAPTAIN REPORTED THAT BOTH DME’S OUT OF SERVICE. PERFORMED REVISION DETECTING A LIGHTNING STRIKE IN THE DME ANTENNA & A  (N997AM)
- [SDR HALA2014060300075](https://openairdocs.org/sdr/HALA2014060300075), Jun 3, 2014: Boeing 76733A. CONTROL UNIT. OUT OF ALIGNMENT. LEFT IRS SYS DISPLAYS 25 KNOTS GROUND SPEED & INCREASING. ALIGNED IRUS AND OPS CHECKED IAW MM34-51-00. ACFT OK FOR SERVI (N598HA)
- [SDR SIMA20131216007](https://openairdocs.org/sdr/SIMA20131216007), Dec 16, 2013: Emb EMB145LR. ANTENNA. CORRODED. REMOVE ANTENNA PN DMNI50-4-2, SN 17163 BASE ERODED & CORRODED. (N625AE)
- [SDR SIMA20131003009](https://openairdocs.org/sdr/SIMA20131003009), Oct 3, 2013: Emb EMB145LR. MODULE. FAILED. DURING PREFLIGHT AFTER BATTERIES AND AVIONICS WERE TURNED ON, F/O NOTED SMOKE COMING OUT OF THE AVIONICS VENT. SMOKE HAD (N907AE)
- [SDR QXEA2013083001304](https://openairdocs.org/sdr/QXEA2013083001304), Aug 29, 2013: Bombdr DHC8402. ANTENNA. CORRODED. EVIDENCE OF CORROSION AROUND NR 2 DME ANTENNA. REMOVED NR 2 DME ANTENNA IAW AMM 34-53-11-000-801. REMOVED SMALL TRACES O (N435QX)
- [SDR CA130828004](https://openairdocs.org/sdr/CA130828004), Aug 27, 2013: Dhav DHC8202. ANTENNA. CRACKED. (CAN) DME ANTENNA BLADE FOUND CRACKED 2- ANTENNA REPLACED IAW AMM 34-53-04.
- [SDR HALA2011122600615](https://openairdocs.org/sdr/HALA2011122600615), Dec 26, 2011: Boeing 7673CB. IRU. FAILED. ETOPS SIGNIFICANT SYS - EICAS ADVISORY MESSAGE "SPLIT IRS OPNS" CTR IRS UNRELIABLE NO LAND 3 - AUTOLAND STATUS ON APP. " (N590HA)
- [SDR HALA2011120900574](https://openairdocs.org/sdr/HALA2011120900574), Dec 9, 2011: Boeing 76733A. WARNING MESSAGE. FALSE ACTIVATION. ETOPS SIGNIFICANT SYS, DURING LANDING ROLLOUT LEFT IRS FAULT MESSAGE ON EICAS. PERFORMED LEFT IRS TEST IAW AMM 34-21-00, (N580HA)
- [SDR CA111025005](https://openairdocs.org/sdr/CA111025005), Oct 19, 2011: Dhav DHC8311. TRANSCEIVER. FAULTED. (CAN) NR 1 NAV HEAD TO GET DME WOULD HAVE TO SELECT STATION, THEN DESELECT, THEN RESELECT STATION TO GET DME. FOUND TO B
- [SDR SIMA201126903](https://openairdocs.org/sdr/SIMA201126903), Sep 23, 2011: Emb EMB135KL. DME. INOPERATIVE. ON FLIGHT 4452 THE CREW REPORTED THE NAV 2 VOR AND NAV 2 LOC INOPERABLE. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED  (N818AE)
- [SDR 2011FA0000625](https://openairdocs.org/sdr/2011FA0000625), Sep 21, 2011: Bolkms BK117B1. INDICATOR. DAMAGED. DME READABILITY IS MARGINAL. CO-PILOTS MASTER CAUTION LIGHT BARELY VISIBLE WHEN LIT. MAST MOMENTS WARNING LIGHT IS BAREL (N117AP)
- [SDR 2011FA0000618](https://openairdocs.org/sdr/2011FA0000618), Sep 21, 2011: Bolkms BK117B1. INDICATOR. DAMAGED. DME UNREADABLE. CO-PILOTS MASTER CAUTION LIGHT BARELY VISIBLE WHEN LIT. DH LIGHT ON RADAR ALTIMETER IS INTERMITTENT AND  (N170MC)
- [SDR HALA2011071100322](https://openairdocs.org/sdr/HALA2011071100322), Jul 11, 2011: Boeing 7673G5. WARNING LIGHT. FALSE ACTIVATION. ETOPS SIGNIFICANT SYS - ON LANDING EICAS MESSAGE " R IRS FAULT" AND OVERHEAD FAULT LIGHT FOR RT IRS CAME ON. PERFORMED B (N586HA)
- [SDR HALA2011070800319](https://openairdocs.org/sdr/HALA2011070800319), Jul 8, 2011: Boeing 76733A. INDICATOR. MALFUNCTIONED. ETOPS SIGNIFICANT SYS - UNABLE TO ALIGN NAV'S 3 ATTEMPTS. REALIGNED LT, CTR & RT IRU'S OPS CHECKED OK IAW FIM 34-21-00 F (N583HA)
- [SDR HALA2011062900299](https://openairdocs.org/sdr/HALA2011062900299), Jun 29, 2011: Boeing 76733AER. IRS. MALFUNCTIONED. ETOPS SIGNIFICANT SYS - EICAS MSG L-IRS FAULT ILLUMINATED AND LT IRS FAULT ENOUNCED ON OVERHEAD AFTER LANDING. SWAPPED S (N593HA)
- [SDR HALA2011051500196](https://openairdocs.org/sdr/HALA2011051500196), May 15, 2011: Boeing 76733A. WARNING LIGHT. ILLUMINATED. ETOPS SIGNIFICANT SYS - ON LANDING LEFT IRS FAULT LIGHT ILLUMINATED. PERFORMED ALIGN TEST IAW AMM 34-22-00. SYS CHECK OK (N583HA)
- [SDR HALA2011050100177](https://openairdocs.org/sdr/HALA2011050100177), May 1, 2011: Boeing 767332. IRS. FAULTED. ETOPS SIGNIFICANT SYS - LEFT IRS FAULT ILLUMINATED AFTER LANDING. ACCOMPLISHED FIM 34-21-00/101, TESTS 1-13 SYS CHECKS.  (N594HA)
- [SDR HALA2011041000149](https://openairdocs.org/sdr/HALA2011041000149), Apr 10, 2011: Boeing 76733A. IRU. FAILED. ETOPS SIGNIFICANT SYS - NO LT IRS NAC MILE READING ON IRS MONITOR. REPLACED LT IRU. OPS CHECK OK IAW AMM 34-21-01. PERFO (N583HA)
- [SDR UALA2011030801138](https://openairdocs.org/sdr/UALA2011030801138), Mar 7, 2011: Boeing 767322. ANTENNA. DAMAGED. LOWER, CENTER YELLOW ANTENNA HAS EVIDENCE OF LIGHTNING STRIKE. DAMAGED MARKED WITH TAPE. REMOVED LT DME ANTENNA IAW MM.  (N662UA)
- [SDR HALA2010121600592](https://openairdocs.org/sdr/HALA2010121600592), Dec 16, 2010: Boeing 7673G5. WARNING LIGHT. ILLUMINATED. ETOPS SIGNIFICANT SYS - "L IRS FAULT" LGT ILLUMINATED AFTER TOUCHDOWN. RAN LT IRS SYS IAW AMM34-21-00, OPS CK GOOD. (N586HA)
- [SDR HALA2010112500566](https://openairdocs.org/sdr/HALA2010112500566), Nov 25, 2010: Boeing 7673CB. INDICATOR. MALFUNCTIONED. ETOPS SIGNIFICANT SYSTEM - ON TOUCHDOWN IRS L 3.6 NM; ILS C 3.2 NM; ILS R 0.7 NM EXCESS OF 2.0 NM NORMAL LIMIT. WITH IN  (N588HA)
- [SDR HALA2010111000533](https://openairdocs.org/sdr/HALA2010111000533), Nov 10, 2010: Boeing 76733A. IRU. FAULTED. ETOPS SIGNIFICANT SYS - AFTER LANDING "L IRS FAULT" MESSAGE. REPLACED NR1 IRU IAW MM 34-21-01. GND CK OK. PERFORMED MCDP (N582HA)
- [SDR S9BA20100008](https://openairdocs.org/sdr/S9BA20100008), Nov 7, 2010: Dhav DHC6300. INDICATOR. INOPERATIVE. DME INOPERATIVE, SMOKE CAME OUT OF UNIT. TURNED OFF UNIT. FLIGHT CONTINUED IAW MEL 34-4-11 KN 62A, SN 20640 TO BE SENT F (N251SA)
- [SDR 2010F00211](https://openairdocs.org/sdr/2010F00211), Sep 26, 2010: Gulstm 690B. CONTROL HEAD. BURNED. DME HEAD SHORTED INSIDE CAUSING SMOKE TO BE PULLED INTO AVIONICS VENTILATION SYS AND CIRCULATED TO THE ACFT CABIN. (N93ME)
- [SDR HALA2010090900408](https://openairdocs.org/sdr/HALA2010090900408), Sep 9, 2010: Boeing 7673CB. IRU. FAULTED. ETOPS SIGNIFICANT SYS - LT IRS FAULT. REPLACED LT IRU OPS CHECK OK IAW MM 34-21-01. PERFORMED MCDP GROUND TEST 30 CHECK  (N590HA)
- [SDR USAA20100903BB053](https://openairdocs.org/sdr/USAA20100903BB053), Sep 2, 2010: Boeing 7572S7. LIGHT. INOPERATIVE. LAX - EN ROUTE FROM PHX TO LAX, CREW REPORTED THE FIRST OFFICER'S VOR/DME SWITCH WAS INOPERATIVE. WHEN SWITCH WAS PUSHED (N905AW)
- [SDR HALA2010051300213](https://openairdocs.org/sdr/HALA2010051300213), May 13, 2010: Boeing 76733A. IRU. INOPERATIVE. ETOPS SIGNIFICANT SYS - ON PRE DEPARTURE CK L IRU INOP. REPLACED L IRU OPS CK OK IAW MM34-31-00. PERFORMED MCDP TEST 30  (N587HA)
- [SDR HAEA201000213](https://openairdocs.org/sdr/HAEA201000213), Feb 1, 2010: Lear 25. INDICATOR. FAILED. CREW OBSERVED THE DME DISPLAY TO GO EXTREMELY BRIGHT FOLLOWED BY THE CIRCUIT BREAKER POPPING. CREW BRIEFLY NOTICED AN EL (N265TW)
- [SDR HALA2009122800607](https://openairdocs.org/sdr/HALA2009122800607), Dec 28, 2009: Boeing 76733A. WARNING LIGHT. FALSE ACTIVATION. ETOPS SIGNIFICANT SYS - C IRS FAULT LIGHT ILLUMINATED ON TOUCHDOWN NOTE STATUS LIGHT ALSO. PERFORMED FIM 34-21-00 C IRS  (N583HA)
- [SDR S9BA20090014](https://openairdocs.org/sdr/S9BA20090014), Dec 2, 2009: Dhav DHC6300. CONTROL HANDLE. ODOR. UNUSUAL ODOR NOTED IN FLIGHT: RETURNED TO DEPARTURE AS A PRECAUTION. FOUND DME INDICATOR HEAD HOT AND SMELLED BURNED. RE (N562CP)
- [SDR HALA2009100400449](https://openairdocs.org/sdr/HALA2009100400449), Oct 4, 2009: Boeing 7673G5. IRS. FAULTED. ETOPS SIGNIFICANT SYS - R IRS FAULT.F10 SELECTED IRS ALT AND COMPLIED WITH Q RT. PERFORMED BITE TEST IAW FIM 34-20-00, F (N586HA)
- [SDR 2009F00059](https://openairdocs.org/sdr/2009F00059), Aug 19, 2009: Stbros SD330. INDICATOR. SMOKE. DURING LEVEL OFF AT 5000 FT, CREW SMELLED AND OBSERVED SMOKE COMING FROM THE CAPTAIN'S SIDE GLARESHIELD. MX DETERMINED T (N336MV)
- [SDR HALA2009072600333](https://openairdocs.org/sdr/HALA2009072600333), Jul 26, 2009: Boeing 767332. IRS. MALFUNCTIONED. ETOPS SIGNIFICANT SYS - C IRS FAULT EICAS ILLUMINATED ALONG WITH FAULT LIGHT ON IRS MODE SELECT PANEL AGAIN. NO READING  (N598HA)
- [SDR HALA2009052600199](https://openairdocs.org/sdr/HALA2009052600199), May 26, 2009: Boeing 76733A. TRANSCEIVER. FAILED. NR 2 DME INOP. REPLACED DME T/R UNIT, OPS CHECK OKAY PER MM 34-55-00. (N583HA)

All 197: https://openairdocs.org/jasc/3451/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 (1,150 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 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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