# Service difficulty reports: JASC 3420

A list on [JASC 3420](https://openairdocs.org/jasc/3420.md).

Reports filed under 3420 · Attitude and Direction Data System, newest first.

Page 1 of 16 · 772 reports

- [SDR CALA2026100520099](https://openairdocs.org/sdr/CALA2026100520099.md): Adiru · faulty · Oct 3, 2026 · N27421 · Boeing 737924ER
  > IRS RT FAULT FOLLOWING FIM 34-21 TASK 803, PERFORMED BITE TEST AND FAULT MESSAGES ATTATCHED IN IMAGES. REMOVED AND REPLACED R ADIRU REF. AMM TASK 34-21-01-000-801 AND TASK 34-21-01-400-801. INSTALLATION TEST PASSED.PARTS USED: 60-3421-9-0001,QTY:1 POS - 2 MFG
- [SDR QR9R2026082600002](https://openairdocs.org/sdr/QR9R2026082600002.md): Ahrs · failed · Aug 26, 2026 · Bolkms BK117C2
  > AHRS FAIL FLT 1. TEST FLIGHT EVAL FOUND AHRS DISC APPEARED MULTIPLE TIMES DURING A 0.2 HOVER FLIGHT. OTHER INDICATIONS WERE AS FOLLOWS: "Y","R", AND "P" IN AMBER ON BOTH PFDS, AND "ROLRAT DIS" ON LANE 2 SCROLL PAGE. ALL OTHER INDICATIONS APPEARED NORMAL WITH T
- [SDR VNAA2026080422201](https://openairdocs.org/sdr/VNAA2026080422201.md): Iru · unserviceable · Aug 2, 2026 · N617NN · Cndair CL6002D24
  > PITCH FEEL FAULT STATUS MSG IN FLIGHT AND YD2 INOP, FMS 2 DISPLAYED IRS REVERTED LOST FO'S PFD INDICATION C/A REMOVED AND REPLACED IRU 2 IAW CRJ900 AMM 34-45-01-000/400-801-A01.
- [SDR YENA2026070900525](https://openairdocs.org/sdr/YENA2026070900525.md): Indicator · inoperative · Jul 7, 2026 · N2142J · Airbus A321271NX
  > FLT # 1177, BOS-LAS. (ETOPS) "FLT ATT DIRECT VIEW SYS INOP ( E-DIRECT VIEW SYSTEM)"
- [SDR 2026F00098](https://openairdocs.org/sdr/2026F00098.md): Ahrs · failed · May 6, 2026 · N418AW · Cndair CL6002B19
  > FLIGHT OB139 VVI/CBB CANCELED FLIGHT. FAILURE DETECTED DURING PRE-FLIGHT: AHRS#1 FAILURE WITH RED FLAGS ON PFD #1
- [SDR 2026FA0000307](https://openairdocs.org/sdr/2026FA0000307.md): Isis · faulted · Apr 30, 2026 · N281AV · Airbus A320214
  > ISIS FAULT DURING TAXI
- [SDR DXTA2026032407359](https://openairdocs.org/sdr/DXTA2026032407359.md): Adc · faulted · Mar 22, 2026 · N874QS · Textrn TEXTRON700
  > ON TAKEOFF AT ROTATION AMBER 'BOTH ON ATT/HDG 2' PFD MSG DISPLAYED. IN CRUISE FLIGHT PILOT SIDE OUTBOARD GTC WAS ON HDG 2 WHEN HDG 1 SELECTED AMBER PFD MSG CLEARED. SHORTLY AFTER AMBER 'BOTH ON ADC2' PFD MSG DISPLAYED AND STAYED ON REMAINDER OF FLIGHT. RERAC
- [SDR 2A6R2026031675004](https://openairdocs.org/sdr/2A6R2026031675004.md): Ehsi · wrong part · Mar 16, 2026 · N135LC · Urocop EC135T2
  > DURING REINSTALLATION OF THE EHSI (ELECTRONIC HORIZONTAL SITUATION INDICATOR), THE INSTALLING TECHNICIAN NOTED THAT THE LOCKING TEETH RETAINER ON THE UNIT'S J3 CONNECTOR WOULD NOT LOCK AS EXPECTED WHEN CONNECTING THE AIRFRAME P3 D-SUB CONNECTOR. IT WAS ALSO NO
- [SDR DXTA2026031207224](https://openairdocs.org/sdr/DXTA2026031207224.md): Ahrs · failed · Mar 11, 2026 · N386QS · Emb EMB505
  > AHRS 2 FAIL AT 32000', ACCOMPANIED BY AP FAIL AND YD FAIL. PFD 2 AUTO REVERTED TO AHRS 1. AFTER SEVERAL MINUTES AHRS 2 FAIL CAS CLEARED. POSSIBLY ASSOCIATED, AHRS 1 &2 FAULT CAS APPEARED DURING LANDING. CLEARED AFTER LANDING CORRECTIVE ACTION: PER EMBRAER CONT
- [SDR SIMA202602110001](https://openairdocs.org/sdr/SIMA202602110001.md): Irs · failed · Feb 10, 2026 · N779RN · Emb ERJ170100SE
  > IRS 1 FAILED WHEN ACTIVATING -DESCEND NOW- AT FL200 DECLARED EMERGENCY FOR AVONICS.MALFUTION. PERFORMED OPS CHKD OF IRS1 IAW AMM 34-26-00.NO FAULTS OBSERVED AT THIS TIME.OPS CHKD OK
- [SDR AALA202601081069](https://openairdocs.org/sdr/AALA202601081069.md): Deu · faulty · Jan 6, 2026 · N936NN · Boeing 737823
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: CAPTAIN SPEED TAPE AND ALTITUDE TAPE AND VVI BLANKED INFLIGHT WITH ALTITUDE AND SPEED ANNUNCIATED ALSO DISPLAY SOURCE 1 ILLUMINATED INFLIGHT. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT ORD. REMOVED AND RE
- [SDR COEA2025121206779](https://openairdocs.org/sdr/COEA2025121206779.md): Display · failed · Dec 12, 2025 · N779FE · Cessna 208B
  > FLIGHT 4701 ENROUTE: GEG-PSC DURING FLIGHT, THE PRIMARY FLIGHT DISPLAY (G600), LEFT SIDE, FAILED. THE AIRCRAFT LANDED WITHOUT INCIDENT AND NO EMERGENCY WAS DECLARED. MAINTENANCE REPLACED THE GDU 620 DISPLAY UNIT. OPS CHECK GOOD.
- [SDR VNAA2025111711103](https://openairdocs.org/sdr/VNAA2025111711103.md): Computer · unserviceable · Nov 16, 2025 · N596NN · Cndair CL6002D24
  > DURING CLIMB OUT, LEFT PFD ATTITUDE INDICATOR REMOVED, RED FD, ATT,AND HDG FLAGS DISPLAYED ON PFD, ACCOMPANIED WITH AUTOPILOT DISCONNECT AND YD 1 INOPERATIVE AND PITCH FEEL FAULT STATUS MESSAGES. INTERROGATED MDC FOUND B1 CODE 005923 AND MULTIPLE OTHER ONES W
- [SDR SIMA20251022002](https://openairdocs.org/sdr/SIMA20251022002.md): Iru · faulted · Oct 22, 2025 · N770JM · Emb ERJ170100LR
  > IRS 1 FAIL EMERGENCY DECLARED. RAR #1 MICRO IRU IAW ERJ AMM 34-26-01 OPS CHECK GOOD
- [SDR AJXA2025101500037](https://openairdocs.org/sdr/AJXA2025101500037.md): Aoa · failed · Oct 12, 2025 · N16PR · Cessna 750
  > PILOTS ANGLE OF ATTACK FAILED. MAINTENANCE PERFORMED BIT TEST OF AOA COMPUTER AND COULD NOT DUPLICATE THE FAULT.AIRCRAFT WAS RETURNED TO SERVICE AND HASS COMPLETED SIX FLIGHTS WITHOUT ANY ADDITIONAL ISSUES.
- [SDR ABXA20251011265](https://openairdocs.org/sdr/ABXA20251011265.md): Indicator · fluctuates · Oct 11, 2025 · N220CY · Boeing 767383
  > ON INITIAL CLIMB FROM KCVG STATNDY ATTITUDE INDICATOR BECAME ERRACTIC AND UNRELIABLE AC RETURNED TO FIELD AND RETURNED TO BLOCKS,MTX GROUNDED AC.MTX TROUBLE SHOT AND REMOVED AND REPLACED THE STBY INTEGRATED INDICATOR REF B767 AMM SUPPLEMENT 34-20-00. ALL O
- [SDR 3EJA2025092200052](https://openairdocs.org/sdr/3EJA2025092200052.md): Ahrs · failed · Sep 17, 2025 · N782JS · Cessna 525B
  > AHRS 1 FAILED WHILE CLIMBING THROUGH 400 FT. TROUBLE SHOT SYSTEM. SWAPPED #1 AND #2 ECU AND POWERED AVIONICS. BOTH AHRS POWERED UP AND INITIALIZED AS REQUIRED. NO FAULT FOUND.
- [SDR CALA2025091608967](https://openairdocs.org/sdr/CALA2025091608967.md): Flag · false activation · Sep 12, 2025 · N23707 · Boeing 737724
  > FO PFD DISPLAYING SPD AND ALT FLAGS TESTED RIGHT ADR SYSTEM REF. TO 34-21-00, TESTED GOOD.
- [SDR CALA2025091508917](https://openairdocs.org/sdr/CALA2025091508917.md): Eadi · faulted · Sep 11, 2025 · N642UA · Boeing 767322
  > CAPT ADI BLURRED OUT AFTER REACHING CRUISE ALTITUDE PANEL INSTL-PILOTS MAIN (ELECTRONIC ATTITUDE DIRECTOR INDICATOR ONLY) REFERENCE: 34-22-03-02 ONE EACH IN IAD P# 622-5047-101 R/R CAPT ADI MULTICOLOR SCREEN REF. AMM 34-22-03. OPS CHECK GOOD.
- [SDR CALA2025081107583](https://openairdocs.org/sdr/CALA2025081107583.md): Indicator · faulted · Aug 9, 2025 · N469UA · Airbus A320232
  > STDBY ATTITUDE INDICATOR HAS FAILED REPLACED STANDBY ATTITUDE INDICATOR, OPS CHECK GOOD MM 34-22-24.APARTS USED: 31-4170-9-0001,QTY:1 ROTABLE PARTS CHG:TT # 1449521 SN OFF 2440 PN OFF 31-4170-9-0001 INDICATOR, STAN OFF 31-4170-9-0001 2440 ON 31-4170-9-0001
- [SDR DALA2025060904362](https://openairdocs.org/sdr/DALA2025060904362.md): Isis · failed · Jun 7, 2025 · N413DX · Airbus A330941
  > SHIP 3413 -DIV- TO BOS DUE TO ISIS (INTEGRATED STANDBY INSTRUMENT SYSTEM) FAILED. RESET ISIS. NO FAULTS FOUND. (7566088)
- [SDR 2025FA0000284](https://openairdocs.org/sdr/2025FA0000284.md): Air Data Module · active · Apr 21, 2025 · N555BD · Cubcft CC19215
  > DURING A SEPT 16, 2024 FLIGHT IN RAINY CONDITIONS IN ALASKA, AT APPROXIMATELY 8:30PM, THE PIC OBSERVED THE ATTITUDE FLIGHT DISPLAY TUMBLE. THE PIC OBSERVED THIS HAPPEN IN DURING A FLIGHT IN SIMILAR CONDITIONS (RAIN) ON JULY 30, 2022, AT APPROXIMATELY 12:00 NOO
- [SDR SWIA202503310001](https://openairdocs.org/sdr/SWIA202503310001.md): Warning Message · illuminated · Mar 30, 2025 · N965SW · Cndair CL6002B19
  > ON DECENT RECIEVED EFIS COMP MON WITH IAS ON BOTH PFDS RAN QRH AND MSGS PERSISTEDCAPT SIDE GOT AN IAS FLAG, PITCH AND ROLL FLAG. FO SIDE GOT AN IAS FLAG, PITCH AND ROLL AND ALTITUDE FLAG. CAPT SIDE WAS COMING BACK BUT FO STILL HAD ALL THE FLAGS. DIVERED TO LAS
- [SDR CALA2025021802359](https://openairdocs.org/sdr/CALA2025021802359.md): Adiru · faulted · Feb 17, 2025 · N62894 · Boeing 737924ER
  > IRS2 FAIL IN FLT REPLACED RH ADIRU REF AMM TASK 34-21-01-400-801, OP CHECKS GOOD, PERFORMED LAND TEST REF AMM 22-11-00, ALL TESTS PASSED, AIRCRAFT REMAINS FULL AUTOLAND CAPABLE PARTS USED: 60-3421-9-0001,QTY:1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 144481
- [SDR CALA2025012201969](https://openairdocs.org/sdr/CALA2025012201969.md): Adiru · faulted · Jan 18, 2025 · N17335 · Boeing 7378
  > IN FLIGHT CA SIDE INSTRUMENTS FAILED. RAN THE DISPLAY FAIL FM DID NOT WORK. FOUND MAINTENANCE MESSAGE 34-21991. NOT ACTIVE. REALIGNED LEFT ADIRU PER AMM 34-21-00-820-803. ALL MESSAGES CLEARED. ACCOMPLISHED OPERATION CHECK OF THE ADIRU PER AMM TASK 34-21-00-71
- [SDR ABXA20241207246](https://openairdocs.org/sdr/ABXA20241207246.md): Iru · failed · Dec 7, 2024 · N1361A · Boeing 76731B
  > AFTER PUSHBACK R IRS ALIGN EICAS AND DISCRETE LIGHT ILLUMINATED. PERFORMED QUICK ALIGN AND STATUS DID NOT CHANGE. AIIRCRAFT RETURNED TO GATE. MAINTENANCE GROUNDED AIRCRAFT. TRIED NEW CENTER IRU, NO HELP. WAPPED RIGHT & CENTER SYMBOL GENERATOR, NO HELP. ALL UNI
- [SDR ABXA20241004184](https://openairdocs.org/sdr/ABXA20241004184.md): Iru · faulted · Oct 4, 2024 · N1427A · Boeing 767306
  > DURING TAXI OUT EICAS MESSAGE R IRS FAULT AND DESCRETE CAME ON AC RETURNED TO THE GATE AND MTX GROUNDED AC.MTX DEFERRED THE R IRU IAW MEL ABX-34-21-1-1-2A. AND RETURNED AC TO SERVICE AND AC DEPARTED.
- [SDR QR9R2024091700001](https://openairdocs.org/sdr/QR9R2024091700001.md): Ahrs · warning light · Sep 17, 2024 · Bolkms BK117C2
  > AHRS1 WARNING REPLACED PFD AND ND, MAINTENANCE RESET PERFORMED. HOVERED OUT TO DO POWER CHECK AND AHRS1 CAME UP AGAIN. REMOVED AND REPLACED AHRU; MOC SUCCESSFULLY COMPLETED.
- [SDR DXTA2024072600011](https://openairdocs.org/sdr/DXTA2024072600011.md): Avionics Unit · broken · Jul 25, 2024 · N410QS · Emb EMB505
  > AVIONICS INTEGRATION (IAC, NIC PROC, MAU, GEA, IAPS): ON BASE LEG TO LANDING WE GOT AMBER X'S ON ENGINE, FUEL, FLAPS AND TRIM. ALONG WITH AN AURAL ALTTITUDE ALERT TONE. ALSO ALL THREE LANDING GEAR INDICATIONS TURNED RED AFTER THE BEFORE LANDING CHECK WAS COMPL
- [SDR Q5QA20240627005](https://openairdocs.org/sdr/Q5QA20240627005.md): Ahrs · malfunctioned · Jun 26, 2024 · N412MD · Pilats PC1245
  > DURING FLIGHT THE AHRS SYSTEM RESET WHILE ENCOUNTERING SEVERE TURBULENCE REQUIRING EMERGENCY ACTION. ALL SYSTEMS EVENTUALLY CAME BACK ONLINE AFTER EXITING THE TURBULENCE AND THE FLIGHT CONTINUED WITHOUT FURTHER ISSUE.
- [SDR CALA2024040300962](https://openairdocs.org/sdr/CALA2024040300962.md): Indicator · faulted · Apr 2, 2024 · N33203 · Boeing 737824
  > REF LP 7534725, INCORRRECT MEL USED FOR DEFERRAL. CANNOT MEL STBY ATT IND DUE TO CURRENT ROUTING WX CONDITIONS. MUST FIX. LOCKED TO CONFIRM FIX. UNLOCKING FOR SIGNOFF. ACCOMPLISHED FIM 34-24 TASK 801. NO FAULTS FOUND ON MMR. RESET STANDBY INDICATOR PER MM 34
- [SDR CALA2024011700131](https://openairdocs.org/sdr/CALA2024011700131.md): Adiru · intermittent · Jan 14, 2024 · N15712 · Boeing 737724
  > AIRSPEED AND ALTITUDE DISAGREE IN FLT. CAPT SIDE WAS RELIABLE. CLEARED BELOW 7000 AGL. UNIT, ADIRU, AI OFF 29-3421-9-0010 5345 ON 29-3421-9-0010 6370 UNIT, ADIRU, AI OFF 29-3421-9-0010 5345 ON 0000 INSPECTED PITOT PROBES AND AOA VANE. NO DEFECTS FOUND. CHECKED
- [SDR G1IA20231030051](https://openairdocs.org/sdr/G1IA20231030051.md): Vertical Gyro · faulted · Oct 30, 2023 · N930MQ · Beech C90A
  > DURING CRUISE FLIGHT, AIRCRAFT PITCHED NOSE DOWN AND BEGAN A ROLL TO THE RIGHT. LOOKING AT THE PILOT'S ATTITUDE INDICATOR, IT HAD ROLLED INVERTED THEN WENT BLANK.
- [SDR SWIA20230927004](https://openairdocs.org/sdr/SWIA20230927004.md): Unknown · unreliable · Sep 24, 2023 · N750SK · Cndair CL6002C10
  > EFIS COMP MON CAUTION INFLIGHT. ROLL PITCH HDG YELLOW FLAGS. HDG RED FLAGS DISPLAYED AS WELL. FOS HSI UNRELIABLE, CAS HSI UNRELIABLE AS WELL. QRH DID NOT FIX THE ISSUE, FLIGHT DIVERTED. GPS WAS ALSO UNRELIABLE. (FLIGHT 3112 FILED CLOSED)THIS DISCREPANCY WAS TR
- [SDR M17F20230906122](https://openairdocs.org/sdr/M17F20230906122.md): Adiru · failed · Aug 9, 2023 · Boeing 737852
  > IRS FAULT 342 070 41
- [SDR 2023FA0000377](https://openairdocs.org/sdr/2023FA0000377.md): Ahrs · failed · Jul 17, 2023 · N696RB · Lear 60LEAR
  > MONDAY 7/17/203, LEAR 60, N696RB DEPARTED KICT AND ON CLIMB THE CO PILOTS PFD DISPLAYED ERROR MESSAGES INDICATING THE AHRS (ATTITUDE REFERENCE HEADING SYSTEM) FAILED. THE CREW DECIDED TO RETURN TO KICT. BOMBARDIER MAINTENANCE CENTER WAS CONTACTED AND DETERMINE
- [SDR 4DPA2023042100001](https://openairdocs.org/sdr/4DPA2023042100001.md): Computer · failed · Apr 21, 2023 · N265JX · Emb EMB135ER
  > ISSUE-CREW REPORTED SPS ADVANCE AND AHRS 2 FAIL MESSAGES. AP ALSO INOP IN FLIGHT. CORR ACTION- MX TROUBLESHOT THE ISSUE TO A BAD AHRS #2 COMPUTER. R&R'D AHRS COMPUTER ALL OPS TEST CHECKED GOOD.
- [SDR ASAA2023031542386](https://openairdocs.org/sdr/ASAA2023031542386.md): Unknown · unknown · Mar 15, 2023 · N461AS · Boeing 737990ER
  > ON DEPARTURE SEATTLE WX RADAR ON SHOWED PWS INOP & TILT INHIBIT CLIMB CONTINUED WITH TCAS FAILURE,IRS L OUT, FLIGHT DIRECTOR CA SIDE WENT OUT, ON PFD LOWER COMPASS HAD NO NUMBERS, ON ND NO HEADING BUG IN HUD - NO GUIDANCE CUE OR FLIGHT DIRECTOR SYMBOL. GROUNDE
- [SDR 7C7A2022122980051](https://openairdocs.org/sdr/7C7A2022122980051.md): Adi · faulted · Dec 28, 2022 · N151RA · Dhav DHC8311
  > #1 ADI ROLL AND #1 HSI HDG MISMATCH
- [SDR SWAA2022110767873](https://openairdocs.org/sdr/SWAA2022110767873.md): Adiru · failed · Nov 3, 2022 · N484WN · Boeing 7377H4
  > LOST DATA ON CAPTAINS SIDE DISPLAY FAULT LEFT IRS NO 30DH / [01] R&R # 1 ADIRU PER AMM 34-21-01.OPS CHECK GOOD. AIRCRAFT RECERTIFIED TO CAT III STATUS PER MT 734-00-03. VERIFICATION#<BR>31952
- [SDR DXTA2022072066350](https://openairdocs.org/sdr/DXTA2022072066350.md): Screw · sheared · Jul 19, 2022 · N507QS · Cessna 680A
  > AFTER FRA I SWITCHED THE YAW DAMPER ON. THE FO THAT WAS PF SAID HE FELT THE RUDDERS MOVE STRANGELY AND WE RECEIVED AN AP YD FAIL MESSAGE. // SIGNOFF// PERFORMED LITEF LCR-100 HYBRID NAVIGATOR OPS CHECK. NO FAULTS FOUND. NOTIFIED MCC AND THEY ELECTED TO CHANGE
- [SDR 4EZF22071531ZV](https://openairdocs.org/sdr/4EZF22071531ZV.md): Efis · inoperative · Jul 15, 2022 · N31ZV · Lear 31A
  > DURING CRUISE FLIGHT FROM TNCC (CURACAO) TO TNCM (ST MAARTEN) CREW NOTICED A BURNING SMELL & NOTICED CO-PILOT'S TOP PFD BLANK. PFD CB POPPED. FLIGHT CREW DECIDED TO RETURN TO TNCC OUT OF SAFETY PRECAUTION. AFTER ARRIVAL MAINTENANCE DETERMINED THAT THE CO-PILOT
- [SDR 9JLA2022071923497](https://openairdocs.org/sdr/9JLA2022071923497.md): Ahrs · failed · Jul 11, 2022 · N827JN · Cessna 560XL
  > THE FLIGHT CREW REPORTED THAT THE HEADING AND ATTITUDE ON PDF2 FAILED ON CLIMB OUT FROM AIRPORT. SELECTED HDG&ATT REV. AUTOPILOT WOULD NOT ENGAGE DUE TO LACK OF AHRS INPUT. THE BASE MAINTENANCE TEAM TROUBLESHOT AND FOUND THE NO2 AHRS HAD FAILED. IT WAS REMOVED
- [SDR ASAA2022052438437](https://openairdocs.org/sdr/ASAA2022052438437.md): Adiru · faulty · May 24, 2022 · N440AS · Boeing 737990ER
  > L IRS NOT DISPLAYING ANY INFORMATION IN FLIGHT AT FL340. NOTE- POWER INTERRUPTION ON THE GROUND DUE TO AFTER START FLOW BEING DONE INCORRECTLY (APU OFF BEFORE ESTABLISHING ELECTRIC- GEN). RE-RAN CHECKLISTS, CHECKED C/B, AND DID NOT NOTE ANY ANOMALIES. GROUNDED
- [SDR HNAA2022052500178](https://openairdocs.org/sdr/HNAA2022052500178.md): None · none · May 18, 2022 · N626AE · Emb EMB145LR
  > PDIS 626 25-00 2667912 18MAY22 RIC CLOSE FIRST OFFICER PFD GOES BLANK SEVERAL TIMES IN FLIGHT FACT 18MAY22 01:37 RIC R/R FO PDF IAW AMM 34-22-00/400-801A. OPS CHECK GOOD OK FOR SERVICE.
- [SDR ASAA2022022437579](https://openairdocs.org/sdr/ASAA2022022437579.md): Unknown · unknown · Feb 24, 2022 · N529AS · Boeing 737890
  > IFSD DISPLAYS OUT OF ORDER. GROUNDED - YES. AIR TURNBACK - DIVERSION TIME 83 MINUTES. T/S IAW B737-800 FIM 34-24 TASK 810. DETERMINED TO BE INTERMITTENT FAULT. PERFORMED ISFD OPS CHK IAW B737-800 AMM 34-24-02. OPS CHK OK.
- [SDR AALA202112158729](https://openairdocs.org/sdr/AALA202112158729.md): Adiru · failed · Dec 11, 2021 · N324SH · Boeing 737*
  > AIRCRAFT WAS NOT GROUNDED: INERTIAL REFERENCE SYSTEM FAILED ON APPROACH WITH LOSS OF VERTICAL GUIDANCE, FLIGHT DECLARED EMERGENCY AND PERFORMED A GO-AROUND. ACCOMPLISHED FUNCTIONAL TEST IAW AMM 34-21-00-710-801, OPS CHECK GOOD.
- [SDR ASAA2021101236277](https://openairdocs.org/sdr/ASAA2021101236277.md): None · none · Oct 12, 2021 · N558AS · Boeing 737890
  > ON CLIMB OUT FMC SHOWED IRS LEFT DRIFT IRS LEFT SIDE INCREASED TO 24 WITH VERIFY POS IRS/IRS. RT IRS FUNCTIONING NORMAL. GROUNDED - YES. DIVERSION TIME 25 MINUTES - REPLACED L/H ADIRU REF B737-800 AMM 34-21-01-400-801 OPENED & CLOSED 3 C/B'S OPS CK OK REF AMM
- [SDR MLJA20210000250](https://openairdocs.org/sdr/MLJA20210000250.md): Hsi · out of limits · Aug 21, 2021 · N3284M · Cessna 310R
  > UPON DEPARTURE THE HSI SHOWED 60 DEGREES OFF ACTUAL HEADING. RE-SLAVE ATTEMPT UNSUCCESSFUL. NOTIFIED ATC AND RETURNED TO FIELD. LANDED WITHOUT INCIDENT. RE-CENTERED HSI. OPERATIONAL CHECK SATISFACTORY.
- [SDR CALA2021081801367](https://openairdocs.org/sdr/CALA2021081801367.md): Adiru · failed · Aug 18, 2021 · N79279 · Boeing 737824
  > IRU FAIL REMOVED AND REPLACED LEFT ADIRU PER AMM 34-21-01, ALL CHECKS GOOD. PERFORMED LAND VERIFY PER AMM 22-11-00-201 ALL TESTS PASSED AND COMPLETE, AIRCRAFT REMAINS FULL CAT CAPABLE. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1100643 SN OFF 3026 UNIT, ADIRU,

Next page: https://openairdocs.org/jasc/3420/reports.md?page=2

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
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 = '3420'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/jasc/3420/reports

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