# Service difficulty reports: N421UW A list on [N421UW](https://openairdocs.org/aircraft/N421UW.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. - [SDR AALA202610053739](https://openairdocs.org/sdr/AALA202610053739.md): Switch · defective · Oct 2, 2026 · N421UW · Airbus A321253NX · Escape Slide > AIRCRAFT IN BASE MAINTENANCE: RIGHT OVERWING EMERGENCY RESEVOIR FAILED INDICATION TEST -MAINTENANCE DETERMINED THE MICROSWITCH ON THE RESERVOIR BOTTLE WAS DEFECTIVE PROHIBITING THE OPERATIONAL TEST FROM WORKING ON THE CIDS PANEL - MAINTENANCE REPLACED THE RESE - [SDR AALA202609289000](https://openairdocs.org/sdr/AALA202609289000.md): Guide · debonded · Sep 27, 2026 · N421UW · Airbus A321253NX · Escape Slide > AIRCRAFT IN BASE MAINTENANCE: L3 DOOR SLIDE ENCLOSURE TUBE GUIDE DISBONDED. MAINTENANCE REPLACED THE SLIDE ASSEMBLY PER JOB CARD 26C15053012 - [SDR AALA202609280327](https://openairdocs.org/sdr/AALA202609280327.md): Guide · debonded · Sep 25, 2026 · N421UW · Airbus A321253NX · Escape Slide > AIRCRAFT IN BASE MAINTENANCE: R3 SLIDE ENCLOSURE TUBE GUIDE DISBONDED - MAINTENANCE REINSTALLED TUBE GUIDE ON THE RIGHT AFT EMERGENCY DOOR SLIDE PER CMM 25-66-54 - [SDR AALA202609218858](https://openairdocs.org/sdr/AALA202609218858.md): Shear Plate · cracked · Sep 19, 2026 · N421UW · Airbus A321253NX · Fuselage Miscellaneous Structure > AIRCRAFT IN BASE MAINTENANCE: CRACKED AFT CABIN FLOOR SHEAR PLATE BETWEEN FR 67 AND FR 70 AT S23L - REPLACED SHEAR PLATE PER EO 5324Y014-001 - [SDR AALA202609218701](https://openairdocs.org/sdr/AALA202609218701.md): Shear Plate · cracked · Sep 19, 2026 · N421UW · Airbus A321253NX · Fuselage Miscellaneous Structure > AIRCRAFT IN BASE MAINTENANCE: CRACKED AFT CABIN FLOOR SHEAR PLATE BETWEEN FR 67 AND FR 70 AT S23R - REPLACED SHEAR PLATE PER EO 5324Y014-001 - [SDR AALA202609180040](https://openairdocs.org/sdr/AALA202609180040.md): Shear Plate · cracked · Sep 15, 2026 · N421UW · Airbus A321253NX · Fuselage Miscellaneous Structure > AIRCRAFT IN BASE MAINTENANCE: CRACKED AFT CABIN FLOOR LATERAL SHEAR PLATE BETWEEN FR 68 AND FR 70 AT S23L - REPLACED SHEAR PLATE PER EO 5324Y014 - [SDR AALA202609187482](https://openairdocs.org/sdr/AALA202609187482.md): Shear Plate · cracked · Sep 15, 2026 · N421UW · Airbus A321253NX · Fuselage Miscellaneous Structure > AIRCRAFT IN BASE MAINTENANCE: CRACKED AFT CABIN FLOOR LATERAL SHEAR PLATE BETWEEN FR 68 AND FR 70 AT S23R - REPLACED SHEAR PLATE PER EO 5324Y014 - [SDR AALA202607067176](https://openairdocs.org/sdr/AALA202607067176.md): Wire · broken · Jul 2, 2026 · N421UW · Airbus A321253NX · Light System Wiring > AIRCRAFT WAS NOT GROUNDED: SEAT ROW 25ABC EMERGENCY LIGHT INOPERATIVE. MAINTENANCE FOUND BROKEN WIRE, REPAIRED BROKEN WIRE PER ESPM 20-43-11 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM WITH NO ISSUES NOTED. - [SDR AALA202508084030](https://openairdocs.org/sdr/AALA202508084030.md): Smoke Detector · false indication · Aug 6, 2025 · N421UW · Airbus A321253NX · Smoke Detection > AIRCRAFT WAS NOT GROUNDED: INTERMITTENT SMOKE LAVATORY SMOKE ECAM ILLUMINATED DURING CRUISE FOR AFT MID LAVATORY. MAINTENANCE REPLACED LAVATORY L SMOKE DETECTOR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 26-17-15, - [SDR AALA202506305157](https://openairdocs.org/sdr/AALA202506305157.md): Actuator · faulted · Jun 19, 2025 · N421UW · Airbus A321253NX · Fuel Transfer Valve > AIRCRAFT WAS NOT GROUNDED: FLIGHT CREW REPORTED A CENTER RIGHT FUEL TRANSFER VALVE FAULT MESSAGE AT START OF DESCENT WITH ZERO FUEL IN ACTS. **SUPPLEMENTAL REPORT FOR AALA202506235157: MAINTENANCE REPLACED THE CENTER RIGHT FUEL TRANSFER VALVE ACTUATOR AND ACCO - [SDR AALA202506235157](https://openairdocs.org/sdr/AALA202506235157.md): Transfer Valve · faulted · Jun 19, 2025 · N421UW · Airbus A321253NX · Fuel Transfer Valve > AIRCRAFT WAS NOT GROUNDED: FLIGHT CREW REPORTED A CENTER RIGHT FUEL TRANSFER VALVE FAULT MESSAGE AT START OF DESCENT WITH ZERO FUEL IN ACTS. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN) - [SDR AALA202504220520](https://openairdocs.org/sdr/AALA202504220520.md): Girt Bar · sticking · Apr 22, 2025 · N421UW · Airbus A321253NX · Emergency Equipment > AIRCRAFT WAS NOT GROUNDED: THE L1 DOOR WAS HARD TO ARM THE SLIDE, GOT IT TO ARM. BUT INFLIGHT THE SLIDE DISARMED ITSELF. MAINTENANCE LUBRICATED THE GIRT BAR / FITTINGS AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 52-73-00. - [SDR AALA202409199814](https://openairdocs.org/sdr/AALA202409199814.md): Life Raft · unlaced · Sep 15, 2024 · N421UW · Airbus A321253NX · Life Raft > AIRCRAFT WAS NOT GROUNDED: PER ETOPS PER-DEPARTURE CHECK ON CABIN GVI, FOUND EMERGENCY RAFT SECURITY LACING AND PIN UNDONE. REMOVED AND REPLACED RAFT. - [SDR AALA202406038294](https://openairdocs.org/sdr/AALA202406038294.md): Flashlight · unsecure · Jun 2, 2024 · N421UW · Airbus A321253NX · Emergency Equipment > AIRCRAFT WAS NOT GROUNDED: 3L JUMPSEAT FLASLIGHT DOES NOT GIVE RED BLINKING INDICATION. SEATED UNSECURED EMERGENCY FLASHLIGHT ONTO CRADLE AT 3L JUMP SEAT PER AMM 25-65-00. - [SDR AALA202308313133](https://openairdocs.org/sdr/AALA202308313133.md): Pipe · leaking · Aug 29, 2023 · N421UW · Airbus A321253NX · Hydraulic System, Main > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRFT RETURNED TO BOS. DUIRNG CLIMBOUT GREEN HYDRAULIC SYSTEM RESEVOIR LOW LEVEL ECAM MESSAGE ILLUMINATED. THE AIRCRAFT LANDED AT BOS WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND FORWARD PRESSSURE SUCTI - [SDR AALA202302145733](https://openairdocs.org/sdr/AALA202302145733.md): Life Raft · damaged · Feb 11, 2023 · N421UW · Airbus A321253NX · Life Raft > AIRCRAFT WAS NOT GROUNDED: LIFE RAFT OVER ROW 26DEF STITCHING SEPARATED ON COVER. MAINTENANCE REPLACED LIFE RAFT PER AMM 25-66-41. - [SDR AALA202201315148](https://openairdocs.org/sdr/AALA202201315148.md): Light · detached · Jan 28, 2022 · N421UW · Airbus A321253NX · Emergency Lighting > AIRCRAFT WAS NOT GROUNDED: PASSENGER SEAT ROW 28 ABC EMERGENCY EXIT LITE BROKEN OFF. REPLACED EMERGENCY EXIT LIGHT SHROUD AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-19. - [SDR AALA202106169002](https://openairdocs.org/sdr/AALA202106169002.md): Gust Lock · lack of lube · Jun 15, 2021 · N421UW · Airbus A321253NX · Passenger/Crew Doors > AIRCRAFT WAS NOT GROUNDED: REAR CABIN DOOR 4L DOOR OPEN LATCH DOES NOT ENGAGE. LUBRICATED LEFT AFT DOOR GUST LOCK LATCH AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 52-13-00. - [SDR AALA202103289006](https://openairdocs.org/sdr/AALA202103289006.md): Smoke Detector · false indication · Mar 27, 2021 · N421UW · Airbus A321253NX · Smoke Detection > AIRCRAFT WAS NOT GROUNDED: MOMENTARY SMOKE LAVATORY A SMOKE INDICATION.TROUBLESHOOT REFERENCE TSM 26-17-00-810-804-A AND FOUND NO INDICIATIONS OF FIRE OR SMOKE. ## 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 n_number = 'N421UW' AND registry_match = 'registration' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/aircraft/N421UW/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.