JASC 3421

Service difficulty reports · 1,142

Reports filed under 3421 · Attitude Gyro and Indicating System, newest first.

Query with SQL
duckdb -csv -c "SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
  FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
  WHERE jasc_code = '3421'
  ORDER BY difficulty_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SDR A6WA202609298915Indicator · faultedIN LEVEL FLIGHT STANDBY ATTITUDE INDICATOR SLOWLY CHANGES TO 75 DEGREES NOSE DOWN ATTITUDE, CAGED INDICATOR AND NO CHANGES. AIRCRAFT REMOVED FROM SERVICE. R & R ISI STBY IND OPS CNAD LK CK GOOD AT THIS TIME REF AMM 34-14-01Sep 29, 2026 · N469AW · Cndair CL6002B19SDR UIEA2026092000888Indicator · failedSTBY ATTITUDE INDICATOR FAILED AFTER TAKEOFF. REMOVED AND REPLACED STANDBY ATTITUDE INDICATOR AS PER AMM 34-24-01/401 AND AIPC 34-24-01-05. OPS CHECK PASSED, NO FURTHER DEFECTS NOTED.</P>)Sep 20, 2026 · N496MC · Boeing 74747UFSDR COEA2026081703856Indicator · faultedFLIGHT 7675 ENROUTE LMT-PDX AIR TURNBACK/DISCREPANCY: STANDBY ATTITUDE INDICATOR UNRELIABLE DURING CLIMB. RETURNED TO LMT. LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY DECLARED. CORRECTIVE ACTION: REPLACED THE STANDBY ATTITUDE INDICATOR.Aug 13, 2026 · N856FE · Cessna 208BSDR DXTA2026080609116Magnetometer · defectiveDURING INITIAL CLIMB OUT, RECEIVED AHRS 1 FAULT. THEN, FOR APPROX 50 PERCENT OF THE TOTAL FLIGHT, YELLOW HDG FLAG APPEARED & MADE LT PILOT & CENTER HEADING INDICATOR UNRELIABLE. REPLACED MAGNETOMETER. OPS CHECK GOOD. IAW PHENOM 300 MM 34-21-02Aug 2, 2026 · N333QS · Emb EMB505SDR CALA2026072618020Adiru · faultedRT IRS FAULT ON CLIMBOUT. ATB, REMOVED AND REPLACED AIR DATA INERTIAL REFERENCE UNIT IAW AMM 34-21-01. OPS CHKD GOOD AND NO FAULT LIGHT ON AT THIS TIME.Jul 26, 2026 · N78501 · Boeing 737824SDR CALA2026072417987Warning Message · false activationSPEED LIMIT FLAG ON CREW REPORTED SPEED LIMUT FLAG WAS ONLY ON CAPT'S SIDE. ACCOMPLISHED FIM TASK 27-32T831 SMYD 1 SHOWS 27-31004 ON LAST LEG, NO OTHER LEGS. ACCORDING TO FIM THERE WAS AN INTERMITTENT SMYD PROBLEM. AUTO SLAT FAIL LIGHT CAME ON FOUND MX MSGJul 21, 2026 · N14219 · Boeing 737824SDR ABXA20260612255Iru · faultedAFTER PUSH BACK IN KSCK RIGHT ADI WAS COLLAPSED AND AFTER TOTAL RESET ON DE-ENERGIZING THE PLANE STILL PERSISTED THE PROBLEM AC RETURNED TO THE GATE (BTB) AND MTX GROUNDED A/C MTX DEFERRED R IRU IAW ABX MEL 34-21-1-1-2B MX ACTIONS COMPLIED WITH, PLACARD INSTALJun 12, 2026 · N1427A · Boeing 767306SDR N6WA2026061201Warning Flag · false activationRED MAG FLAG APPEARED ON FO'S INSTRUMENTS WHILE IN POSITION FOR TAKEOFF., DECLINED TAKE OFF CLEARANCE, NO THRUST, 0 KNOTS, FLAG CLEARED AFTER EXITING RUNWAY. PERFORMED OPS TESTS OF ATTITUDE AND HEADING COMPUTER IAW AMM 34-21-01. OPS TEST GOOD AT THIS TIME. NOJun 4, 2026 · N576GJ · Cndair CL6002C11SDR CALA2026050816083Iru · faultedRIGHT IRS FAULT EICAS PER FLT CREW DEBRIEF, HAD ATTITUDE DISAGREE EICAS, PITCH/ROLL DISPLAYED ON BOTH PFDS. F/OS SIDE PFD INDICATED A DESCENT WHILE THE A/C WAS CLIMBING. F/O SWITCHED TO LEFT SOURCE, AND PFD CORRECTED. ALSO GOT RT IRS EICAS. REMOVED AND REPLACEMay 6, 2026 · N684UA · Boeing 7673CBSDR CALA2026043015898Adiru · faultedHEADING FAIL ON CAPT SIDE ADIRU 1 REPORTED HEADING FAULT, TCAS REPORTED HEADING FAULT, DEU REPORTED SEVERAL ADIRU 1 FAULTS. DUE TO MULTIPLE FAILURES LINKED TO ADIRU 1 REMOVED AND REPLACED ADIRU 1. REF AMM 34-21-01. ADIRU OPS CHECK GOOD. TCAS OPS CHECK GOOD. REApr 28, 2026 · N12754 · Boeing 737724SDR 141A2026042300001Indicator · failedATTITUDE INDICATOR FAILURE PRIOR TO DEPARTURE AND PERFORMED GATE RETURN.Apr 23, 2026 · N1983X · Cessna 208BSDR G41A2026030900163Dau · faultedDEPARTING KLAF HEADING TO KORD WHEN THE GOT A FLIGHT DIRECTOR FAIL MESSAGE ON THE LH PFD/MFD. THE CREW DECIDED TO RETURN TO KLAF. THE AIRCRAFT WAS LANDED SAFELY. LOCAL MAINTENANCE WAS NOT AVAILABLE SO ATI/JETVIA MAINTENANCE ARRIVED AT THE AIRCRAFT. TROUBLE SHOMar 6, 2026 · N812RP · Lear 60LEARSDR CALA2026022614098Adiru · faultedON CLIMBOUT CAPTS PFD LOST AIRSPEED.ALTITUDE. AND HDG. STAYED GONE FOR 10-15 MINS THEN RETURNED. AFTER LRU HISTORY REVIEW, LT AOA SENSOR HAS NUMEROUS REMOVALS FOR THE SAME ISSUES, ACCOMPLISHED WIRE CHECKS IN FUP 8025635, REF SSM 34-21-13-102.1, 34-21-14-101Feb 24, 2026 · N37253 · Boeing 737824SDR AALA202603067992Adiru · faultyAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: CAPTAINS PRIMARY FLIGHT DISPLAY (PFD) FLASHED INTERMITTENTLY SHORTLY AFTER TAKEOFF. BOTH AMBER SPEED AND ALTITUDE DISPLAYED ON CAPTAINS PFD. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT DEN.Feb 17, 2026 · N335PH · Boeing 737823SDR AALA202603068381Computer · faultyAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: CAPTAINS PRIMARY FLIGHT DISPLAY (PFD) FLASHED INTERMITTENTLY SHORTLY AFTER TAKEOFF. BOTH AMBER SPEED AND ALTITUDE DISPLAYED ON CAPTAINS PFD. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT DEN.Feb 17, 2026 · N335PH · Boeing 737823SDR SWAA2026012664114Adiru · faultedRIGHT IRS FAULT LIGHT. PERFORMED IFIM TASK 27-30-00-810-802. R & R RT ADIRU IAW AMM 34-21-01-400-801. AIRCRAFT RECERTIFIED TO CAT III STATUS IAW 834-PRD-01-01, VERIFICATION 54664Jan 23, 2026 · N8888M · Boeing 7378SDR ABXA202512264355Generator · defectiveDURING TAXI, LEFT S/G FAILED AFTER ENGINE START. RAN QRH. ALSO OCURRED FROM GROUND POWER TO APU. AIRCRAFT RETURNED TO BLOCKS. (BTB). DEFERRED LT S/G IAW MEL 34-22-5. REMOVED AND REPLACED LT SYMBOL GENERATOR. OPS CHECK GOOD IAW B767 AMM 34-22-01. DI CLEAREDDec 24, 2025 · N390CM · Boeing 767381SDR CALA2025120911969Aoa · missingRIGHT ANGLE OF ATTACK (AOA) SENSOR MISSING . BIRD STRIKE. REPLACED RT AOA IAW AMM 34-21-05. INSPECTED BOTH RT PITOT PROBES. NO DEFECTS NOTED SENSOR, ANGLE 0.Dec 6, 2025 · N77578 · Boeing 7379SDR CALA2025111911351Indicator · faultedSTBY ATTITUDE INDICATOR FAILED. R & R ISFD OPS CHECKED, TEST PASSED, AND ROLL POINTER VISUAL ALIGNMENT WITHIN TOLERANCE IAW AMM 34-24-02.Nov 17, 2025 · N77012 · Boeing 777224SDR QR9R2025100900002Indicator · inoperativeDURING START RUNUP, STBY ATTITUDE INDICATOR WOULD NOT POWER ON. REMOVED AND REPLACED HORIZON INDICATOR IAW AMM 34-24-00, 4-1; MOC SUCCESSFULLY COMPLETED.Oct 9, 2025 · Bolkms BK117C2SDR AALA202507157128Adiru · failedAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AFTER TAKE OFF APPROX 5000FT BOTH CAPTAIN AND FIRST OFFICER PFD GOT PITCH AMBER FLAG AND THEN ROLL FLAG, AND SCRATCH PAD MESSAGE THE IRS DISAGREE FOLLOWED BY LEFT IRS FAULT LIGHT. CAPTAINS PFD WAS UNRELIJul 14, 2025 · N809NN · Boeing 737823SDR DALA2025063004848Indicator · malfunctionedSHIP 1809 MECHANICAL ATTITUDE INDICATOR FAILED ACCOMPANIED WITH ACRID SMELL SHORTLY AFTER OCEANIC ENTRY. CORRECTIVE ACTION: NO SMOKE AND FUMES FORM IN THE COCKPIT. NO ELECTRICAL SMELL IN THE COCKPIT AND E/E COMPARTMENT. ALL CONNECTORS AND WIRES OK. SMELL IS LOJun 29, 2025 · N833MH · Boeing 767432ERSDR CALA2025052004858Adiru · faultedLEFT IRS LIGHT ON. AFFECTED MULTIPLE SYSTEMS. REMOVED AND REPLACED LEFT ADIRU PER AMM 34-21-01-400-801.May 17, 2025 · N16701 · Boeing 737724SDR QR9R2025032600001Gyro · faultyTHE STANDBY HORIZON (AI-803CY) WOULD NOT CAGE TO PROPER SETTING DURING OPERATIONAL CHECK. PART WAS RECEIVED BAD FROM SUPPLY.Mar 26, 2025 · Bolkms BK117C2SDR AALA202503177691Adiru · unreliableAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AIRSPEED UNRELIABLE ON CLIMB OUT. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT STL. REMOVED AND REPLACED RIGHT HAND (ADIRU)-AIR DATA INERTIA REFERENCE UNIT. PER AMM 34-21-01.Mar 14, 2025 · N903NN · Boeing 737823SDR AALA202503112076Adiru · failedAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: BOTH FLIGHT DIRECTORS DROPPED OFF DURING TAKEOFF ROLL, FLIGHT DIRECTORS 2 RETURNED BUT NOT FLIGHT DIRECTORS 1. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT JFK. TROUBLESHOT SYSTEM FOUND LEFTMar 10, 2025 · N921AN · Boeing 737823SDR CALA2024122401642Adiru · faultedIRS MOTION AND RIGHT ALIGN LIGHT ON RESET SYSTEM ADIRU SYSTEM OK. REF AMM 34-21-00.Dec 22, 2024 · N66814 · Boeing 737924ERSDR CALA2024092002454Module · faultyIAS DISAGREE ON T/O ROLL 50 KNOT SPLIT OBSERVED IN FLIGHT REMOVED AND REPLACED CAPT ADM. IAW AMM 34-21-04. PARTS USED: 29-3413-9-0001,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1725589 SN OFF 4429 MODULE, AIR DAT OFF 29-3413-9-0001 4429 ON 29-3413-9-00Sep 19, 2024 · N73270 · Boeing 737824SDR CALA2024081300410Adiru · faultyIRS-R FAULT LIGHT IS ON CHECKED FAULT MASSAGE: ADIRU-R INTERNAL FAULT. ADDED PARTS USED. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1522004 SN OFF 1048 UNIT, ADIRU, AI OFF 42-3421-9-0001 1048 ON 42-3421-9-0001 5385 REMOVED & REPLACED RT ADIRU (M1752) REF AMMAug 11, 2024 · N17312 · Boeing 7378SDR SWAA2024071512491Adiru · unreliableCREW REPORTS F/O LOST FLIGHT DISPLAY; AIRSPEED UNRELIABLE AND MACH A/S WARNING CONTINUOUS.<[01] R/R #2 ADIRU PER AMM 34-21-01. OPS CHECK GOOD. AIRCRAFT RECERTIFIED TO CATIII STATUS PER MT 734-00-03 VER# 42689Jul 14, 2024 · N7737E · Boeing 7377BDSDR DALA2024070206723Display · failedSHIP 0191 -DIV- TO CDG DUE TO CAPT ADI DISPLAY FAILED. QRH C/W AND ALT SYMBOL GENERATOR SELECTION NO HELP. CORRECTIVE ACTION: REPLACED CAPT ADI DISPLAY. (6080022)Jul 1, 2024 · N191DN · Boeing 767332SDR AALA202405143917Tat Probe · faultyAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AUTO PILOT HORN SOUNDED, FLIGHT DIRECTORS FAILED, AUTOTHROTTLES FAILED, AND AUTO TILT FAILED APPEARED ON THE RADAR; AIRCRAFT DIVERTED TO AND LANDED SAFELY AT DFW. REPLACED TAT PROBE. ADIRU'S BITE CHECK GMay 13, 2024 · N802NN · Boeing 737823SDR A6WA202404288733Indicator · malfunctionedSTANDBY ATTITUDE INDICATOR TUMBLED AFTER TAKE-OFF, INACCURATE DURING FLIGHT. STBY AI SHOWED LEVEL BEFORE TAKE-OFF AND AFTER LANDING. ***** AIRCRAFT REMOVED FROM SERVICE ***** R&R STANDBY ATTITUDE IAW AMM 34-23-01. OPS CHECK GOOD AT THIS TIME. P/N 501-1567-10Apr 28, 2024 · N442AW · Cndair CL6002B19SDR AALA202402279798Adiru · faultyAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: BOTH IRS FAILED AFTER TAKEOFF, AIRCRAFT RETURN TO AND LANDED SAFELY AT MBJ. **SUPPLEMENTAL REPORT FOR (AALA202402269798): REMOVED AND REPLACED (ADIRU) AIR DATA INERTIAL REFERENCE LEFT (AALA202402269798)Feb 25, 2024 · N971AN · Boeing 737823SDR AALA202402276369Adiru · faultyAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: BOTH IRS FAILED AFTER TAKEOFF, AIRCRAFT RETURN TO AND LANDED SAFELY AT MBJ. **SUPPLEMENTAL REPORT FOR (AALA202402269798): REMOVED AND REPLACED (ADIRU) AIR DATA INERTIAL REFERENCE LEFT (AALA202402269798)Feb 25, 2024 · N971AN · Boeing 737823SDR AALA202402270569Display · faultyAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: BOTH IRS FAILED AFTER TAKEOFF, AIRCRAFT RETURN TO AND LANDED SAFELY AT MBJ. **SUPPLEMENTAL REPORT FOR (AALA202402269798): REMOVED AND REPLACED (ADIRU) AIR DATA INERTIAL REFERENCE LEFT (AALA202402269798)Feb 25, 2024 · N971AN · Boeing 737823SDR 2024F00037Gyro · abnormalAIRCRAFT TOOK OFF AND SHORTLY AFTERWARDS THE CREW NOTICED SMOKE IN THE COCKPIT AND THE EMERGENCY PRESSURIZATION RED LIGHT CAME ON. THE CREW DONNED MASKS AND DEPLOYED THE MASKS FOR THE 2 PAX ONBOARD. PAX PUT MASK ON, THE CREW DECLARED AN EMERGENCY WITH MINNEAPOFeb 18, 2024 · N92JQ · Cessna 441SDR 3NXA20240131002Battery Pack · failed inspSTANDBY GYRO BATTERY PACK FAILED CAP CHECK. R&R WITH OVERHAULED UNIT P/N 501-1712-01. OPS CHECK GOODJan 26, 2024 · N90SJ · Cessna 525BSDR CALA2024011700129Indicator · faultedSTBY ATT IND GYRO FLAG IN VIEW AFTER TO. ATTITUDE BAD. INDICATOR, STAN OFF 99-3424-9-0003 6751 ON 99-3424-9-0003 9045 INDICATOR, STAN OFF 99-3424-9-0003 6751 ON 0000 REMOVED AND REPLACED SBY ATTITUDE INDICATOR REF AMM 34-24-01/201. GYRO CAGED IN AND PANEL LIGHJan 14, 2024 · N643UA · Boeing 767322SDR M17F20230724097Tat Probe · failedA/T LIMIT INDICATION SHOWS ON A/T THRUST MODE DISPLAY 223 220 00Jul 8, 2023 · N958AM · Boeing 737852SDR CALA2023062602009Adiru · faultyFMC NAV STATUS IRS L ONLY. NO FAULT LT. FO NO MAG COMP OR HDG B UG.FO TCAS FAIL. ON R ADIRU FOUND FAULT 34-21009 "ENTER HEADING" FAULT ON LAST GOOD. PERFORMED LAND VERIFY TEST PER AMM 22-11-00-700-801. ALL LEG. PER FIM 34-21 TASK 808 FAULT CLEARED AFTER HEADIJun 24, 2023 · N76529 · Boeing 737824SDR DALA2023051503840Unknown · unknownSHIP 0196 - ATB - DUE TO STANDBY ATTITUDE INDICATOR INOP. CORRECTIVE ACTION: C/W OVERWEIGHT LANDING INSP AND REPLACED THE STANDBY ATTITUDE INDICATOR AND STANDBY INVERTER / ILS PROCESSOR. (4671318)May 12, 2023 · N196DN · Boeing 767332SDR CALA2023050301334Adiru · unknownIRS 1 FAILED IN FLIGHT REMOVED AND REPLACED ADIRU 1 REF AMM 34-21-01/401. OPS TEST OK. REQUIRES CAT III TEST. PARTS USED: 29-3421-9-0010,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1925837 SN OFF 3729 UNIT, ADIRU, AI OFF 29-3421-9-0010 3729 ON 29-3421-May 3, 2023 · N39415 · Boeing 737900ERSDR CALA2023042801281Air Data Module · faultedREJECTED TAKEOFF AT 80 KIAS DUE TO IAS DISAGREE MESSAGE PER FIM 31-62 TASK 876, FOUND CAPTAIN'S PITOT ADM FAULTY. REMOVED AND REPLACED CAPTAIN'S PITOT AIR DATA MODULE PER AMM 31-21-04. OPS CHECK GOOD. REF NR# 4440315 FOR DETAILS OF WORK PERFORMED. PARTS USED: Apr 28, 2023 · N38403 · Boeing 737900SDR 2023F00090Indicator · inoperativeSTBY HORIZON INOP. CANCELLED FLIGHT. CORRECTIVE ACTION: REMOVED AND REPLACED STBY ATTITUDE INDICATOR IAW AMM 34-247-01 AND AMM 34-24-00. SYSTEM TEST WITHOUT DISCREPANCIES.Mar 9, 2023 · Boeing 73773ASDR CALA2023030100579Adiru · failedFO PITCH/HEADING NOT SAME AS CA IN FLIGHT TS REF IFIM 34-21-00, FOUND R ADR FAILED WITH LATCHED MESSAGES SEE PICTURES ATTACHED, REPLACED RIGHT ADIRU REF AMM 34-21-01, OPS TEST GOOD. NEEDS LAND VERIFY TEST. PARTS USED: 42-3421-9-0001,QTY :1 ADD FAULT:34-21002 3Feb 28, 2023 · N37537 · Boeing 7379SDR JIKA2023022001Indicator · failedPILOT REPORTED AFTER TAKEOFF FROM KPDX, THE LEFT ATTITUDE INDICATOR FAILED. PILOT DECLARED AN EMERGENCY AND AIRCRAFT RETURNED TO KPDX AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT SYSTEM AND FOUND CAPTAINS’ ATTITUDE INDICATOR WAS INOP. REPLACED ATTITFeb 20, 2023 · N330AV · Beech C99SDR DALA2023021501210None · noneSHIP 3319 ISIS ALT IS OFF BY 2800 FT AT FL350. AIRSPEED IS ALSO OFF BY 35 KTS./MACH IS OFF BY 1.3. CORRECTIVE ACTION: FOUND STBY STATIC LEAK AT 40MJ PRESSURE SWITCH. R/R 40MJ PRESSURE SWITCH. (9449626)Feb 11, 2023 · N819NW · Airbus A330323SDR A6WA202302048454Not Reported · not reportedABORTED TAKE-OFF PRIOR TO 80 KNOTS, EFIS COMP MON HEADING. MESSAGE CLEARED AFTER EXITING RUNWAY. BRAKE TEMPS: 3,3,4,5. UNABLE TO CONFIRM WHICH SIDE OFF PRIOR TO RUNWAY EXIT. CAPTAIN'S SIDE 4 DEGREE DRIFT AFTER ONE MINUTE AFTER EXITING RUNWAY. *********AIRCRAFFeb 4, 2023 · N469AW · Cndair CL6002B19SDR AALA202211217175Display · faultyAIRCRAFT WAS GROUNDED: INFLIGHT AT CRUISE INTEGRATED STANDBY FLIGHT DISPLAY ATTITUDE BEGAN WANDERING UP TO 10 DEGREES NOSE HIGH, 25 DEGREES NOSE LOW, 40 DEGREES BANK. HOG ALTITUDE AND AIRSPEED NORMAL. AIRCRAFT DIVERTED TO MIA. REMOVED AND REPLACED INTEGRATED SNov 18, 2022 · N832NN · Boeing 737823
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