# N121UA: 1999 Boeing 747-422, registration cancelled 2018-01-19 - Type: Cancelled registration (FAA registry, deregistered aircraft) - Cancelled: January 19, 2018 - Status when cancelled: Valid registration - Airframe: [Boeing 747-422](https://openairdocs.org/model/boeing-747-422) (registry code 1384935) - Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE) (OpenAirDocs) - Serial number: 29167 - Year built: 1999 - Type of aircraft: Fixed wing multi engine - Airworthiness date: May 6, 1996 - Certificate issued: April 1, 2013 - Last registry action: December 9, 2015 - Mode S code: A0592C - Owner when cancelled: [United Airlines Inc](https://openairdocs.org/faa-owner/UNITED%20AIRLINES%20INC) - Location: [Chicago, IL](https://openairdocs.org/faa-place/IL/Chicago) - Owner type: Corporation - Owner's area on the map: 41.8813° N, 87.6375° W: Placed by OpenAirDocs at the center of ZIP code 60606, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft was based - The mark today: https://openairdocs.org/aircraft/N121UA - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=121UA - Page: https://openairdocs.org/deregistered/N121UA-2018-01-19 From the FAA registry file of November 12, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe. ADs and bulletins for the Boeing 747-422: https://openairdocs.org/model/boeing-747-422.md ## Service difficulty reports (361, newest 50) Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. - [SDR CALA2017100203399](https://openairdocs.org/sdr/CALA2017100203399), Oct 2, 2017: LIGHT. LOOSE. EMERGENCY LIGHT PANEL AT 19H IS LOOSE. SECURED THE LIGHT AND THE EMERGENCY LIGHTS FUNCTIONAL CHECKED OK. - [SDR CALA2017091103134](https://openairdocs.org/sdr/CALA2017091103134), Sep 11, 2017: LAMP. INOPERATIVE. CEILING EMERGENCY LIGHT INOPERATIVE ABOVE SEAT ROW 16B & 16J. THE LAMP WAS REPLACED AND TESTED NORMAL IAW AMM 33-51-07-962-001. - [SDR CALA2017091103133](https://openairdocs.org/sdr/CALA2017091103133), Sep 11, 2017: LAMP. INOPERATIVE. CEILING EMERGENCY LIGHT INOPERATIVE BETWEEN SEAT ROWS 6B & 6C. LAMP REPLACED AND EMERGENCY LIGHT TESTED NORMAL IAW AMM 33-51-07 -962-001. INSPECTED EMERGENCY LI - [SDR CALA2017091103132](https://openairdocs.org/sdr/CALA2017091103132), Sep 11, 2017: LAMP. INOPERATIVE. OVERWING EMERGENCY LIGHT INOPERATIVE. THE LAMP WAS REPLACED AND EMERGENCY LIGHT TESTED NORMAL IAW AMM 33-51-03 -962-001. INSPECTED EMERGENCY LIGHT IAW MM 33-510 - [SDR CALA2017072102311](https://openairdocs.org/sdr/CALA2017072102311), Jul 21, 2017: LIGHT. INOPERATIVE. EMERGENCY EXIT GUIDE LIGHT IS INOP AT SEAT 55H. REPLACED AND SECURED NEW LIGHT STRIP. OP CHK OK. ACP'D IDT INSPECTION ON EEL LIGHT STRIP AT SEAT 55H, SECURED AN - [SDR CALA2017072102310](https://openairdocs.org/sdr/CALA2017072102310), Jul 21, 2017: CONNECTOR. BROKEN. EMERGENCY EXIT GUIDE LIGHT AT SEAT 57C IS INOP. REPAIRED BROKEN CONNECTOR PIN. OP CHK GOOD. ACP'D IDT INSPECTION OF EEL STRIP LIGHT AT SEAT 57C, SECURED AND OP- - [SDR CALA2017060901762](https://openairdocs.org/sdr/CALA2017060901762), Jun 9, 2017: LIGHT. INOPERATIVE. EMERGENCY LIGHTS, UPPER DECK, BETWEEN UPPER DECK DOORS, TWO EACH CEILING LIGHTS INOP. RELAMPED LIGHTS. OPS CK GOOD REF AMM 33-51-00. - [SDR CALA2017060901761](https://openairdocs.org/sdr/CALA2017060901761), Jun 9, 2017: FUSE. FAULTY. OVERWING EMERGENCY LIGHTS, RT, TWO UPPER LIGHT ASSY, TWO BULBS PER ASSY INOP. REPLACED FUSE ON POWER SUPPLY M7920 FOR OUTPUT PIN 15. REF WDM 3 3-51-41. REF AMM - [SDR CALA2017060901760](https://openairdocs.org/sdr/CALA2017060901760), Jun 9, 2017: LIGHT. MISSING. AISLE EMERGENCY LIGHT AT SEAT 23 LT MISSING. REPLACED EEL STRIP ON AISLE SEAT 23 LT. OPS CHECK GOOD REF AMM 3 3-51-00. - [SDR CALA2017051901496](https://openairdocs.org/sdr/CALA2017051901496), May 19, 2017: LIGHT. UNSECURE. EMERGENCY LIGHTS ON LAV DOOR 101 NEAR 1R ARE FALLING OFF. SECURED BACK OK. - [SDR CALA2017041400981](https://openairdocs.org/sdr/CALA2017041400981), Apr 14, 2017: CART. FAULTY. GALLEY PIGTAIL-ELECTRICAL CORD INOPERATIVE AT AFT GALLEY 55 GETS TOO HOT. SMELLS LIKE BURNING REPLACED NEW TECH CART AND OPER CHKD GOOD. - [SDR CALA2017020600273](https://openairdocs.org/sdr/CALA2017020600273), Feb 4, 2017: LIGHT. INOPERATIVE. OPERATIONAL CHECK EMERGENCY LIGHT SYSTEM FOUND DOOR 1 & DOOR 4 GALLEY EMERGENCY LIGHT NEAR LT AISLE FLOOR NOT ON. SPEC B747-33-3-6021 REPLACED THE EMERGENCY LIG - [SDR CALA2017020300239](https://openairdocs.org/sdr/CALA2017020300239), Feb 2, 2017: LIGHT. MALFUNCTIONED. TEST FOUND EMERGENCY LIGHT M8533 BATTERY LOW. REPLACED THE LIGHT AND TESTED GOOD IAW AMM 33-51-00-715-004, REV 182. - [SDR CALA2017020300238](https://openairdocs.org/sdr/CALA2017020300238), Feb 2, 2017: LAMP. INOPERATIVE. EMERGENCY LIGHT TEST FOUND L4 DOOR FWD DOOR SILL EMERGENCY LIGHT INOPERATIVE. REPLACED THE LAMPS AND FOUND GOOD IAW AMM 33-51-962-031 REV 182. - [SDR CALA2017020300237](https://openairdocs.org/sdr/CALA2017020300237), Feb 2, 2017: LAMP. INOPERATIVE. EMERGENCY LIGHT TEST FOUND CREW REST AREA EMERGENCY POWER PACK LIGHT INOPERATIVE. REPLACED THE LAMP OF THE LIGHT AND PERFORMED OPERATIONAL TEST OF EMERGENCY LT - [SDR CALA2017020300236](https://openairdocs.org/sdr/CALA2017020300236), Feb 2, 2017: LAMP. INOPERATIVE. TEST FOUND EMERGENCY LT X323 LAMP BURN OUT REPLACED THE LAMP AND TESTED GOOD IAW AMM 33-51-06-962-040. - [SDR CALA2016101200755](https://openairdocs.org/sdr/CALA2016101200755), Oct 12, 2016: STATOR. FAILED. NR 3 ENGINE WENT TO EEC ALT MODE AND SHORTLY AFTER THAT THE ENGINE SHUT DOWN. ACPD ENGINE NR 2 PMA ALTERNATOR REPLACEMENT, ENGINE RUNUP TEST OK. NO MESSAGE REMA - [SDR CALA2016082500582](https://openairdocs.org/sdr/CALA2016082500582), Aug 24, 2016: LIGHT. INOPERATIVE. UPPER DECK RT SLIDE LIGHT INOPERATIVE. RELAMPED TESTED OK. - [SDR CALA2016070895523](https://openairdocs.org/sdr/CALA2016070895523), Jul 7, 2016: CONNECTOR. UNSECURE. IAW 'A' CHECK, SEAT 60BC SEAT EMERGENCY LIGHT INOPERATIVE. SECURED THE CONNECTOR AT SEAT 60BC, OPS CHECKED OK. - [SDR CALA2016070895522](https://openairdocs.org/sdr/CALA2016070895522), Jul 7, 2016: LIGHT. INOPERATIVE. IAW THE 'A' CHECK, R5 DOOR SLIDE LIGHT INOPERATIVE. REPLACED SLIDE LIGHT ASSY. OPS CHECKED OK. - [SDR CALA2016070895521](https://openairdocs.org/sdr/CALA2016070895521), Jul 7, 2016: LAMP. INOPERATIVE. IAW 'A' CHECK, L4 DOOR AFT EMERGENCY LIGHT INOPERATIVE. REPLACED THE LAMP. OPS CHECKED OK. - [SDR CALA2016070895520](https://openairdocs.org/sdr/CALA2016070895520), Jul 7, 2016: LAMP. INOPERATIVE. IAW THE 'A' CHECK, OVERHEAD AISLE EMERGENCY LIGHT AT 43HJK INOPERATIVE. REPLACED THE LAMP. OPS CHECKED OK. - [SDR CALA2016070895519](https://openairdocs.org/sdr/CALA2016070895519), Jul 7, 2016: CONNECTOR. DISCONNECTED. IAW THE 'A' CHECK, MID LAVATORY CENTER AND RIGHT EMERGENCY LIGHTS INOPERATIVE. FOUND RIBBON CONNECTOR DISCONNECTED. SECURED THE CONNECTOR. OPS CHECKED OK. - [SDR CALA2016070895518](https://openairdocs.org/sdr/CALA2016070895518), Jul 7, 2016: LAMP. INOPERATIVE. IAW THE 'A' CHECK, OVERHEAD AISLE EMERGENCY LIGHT AT FIRST CLASS INOPERATIVE. REPLACED THE LAMP. OPS CHECKED OK. - [SDR CALA2016021695110](https://openairdocs.org/sdr/CALA2016021695110), Feb 15, 2016: FUSE. BLOWN. EMERGENCY EXIT LIGHT INOPERATIVE. TWO UPPER LIGHT ASSEMBLY’S LT BODY FAIRING EMER EXIT LIGHT. FOUND LT UPPER EXTERIOR EMER EXIT LIGHT ASSEMBLY BURNED OUT. REPLA - [SDR CALA2015041393518](https://openairdocs.org/sdr/CALA2015041393518), Apr 8, 2015: LIGHT. INOPERATIVE. EMERGENCY EXIT LIGHT STRIP INOPERATIVE AT 49HJK. REPLACED EEL STRIP 49HJK. CHECKED OK IAW AMM 33-50-96. - [SDR CALA2015022693176](https://openairdocs.org/sdr/CALA2015022693176), Feb 25, 2015: FUSE. BLOWN. LEFT EMER LT BATTERY CHARGER INOPERATIVE. REPLACED CHARGER FUSE. PERFORMED TEST IAW AMM 33-31-04 REV 172. - [SDR CALA2015022693175](https://openairdocs.org/sdr/CALA2015022693175), Feb 25, 2015: LIGHT. INOPERATIVE. DOOR 5 CREW REST AREA OVER STAIR, THE CEILING EMER LIGHT FOUND INOPERATIVE. DOOR 5 CREW REST AREA OVER STAIR, CEILING EMER LIGHT ASSEMBLY REPLACED. EMER LIGHT T - [SDR CALA2015022693178](https://openairdocs.org/sdr/CALA2015022693178), Feb 24, 2015: ACCESS PANEL. CRACKED. NUMBER 1 PYLON RT ACC PANEL 452ER CUT OUT LOWER AFT EDGE FOUND CRACK. REPAIRED IAW ECRA 5430-02019. - [SDR CALA2015022093151](https://openairdocs.org/sdr/CALA2015022093151), Feb 19, 2015: CABLE. DEFECTIVE. DOOR 3 LAVATORY RT & CTR EEL FOUND INOPERATIVE. R3 DOOR PAX SEAT TO LAVATORY EEL CABLE REPLACED. EMER LT TEST CARRIED OUT & FOUND NORMAL IAW AMM 33-51-13 REV 17 - [SDR CALA2015022093150](https://openairdocs.org/sdr/CALA2015022093150), Feb 19, 2015: CABLE. DEFECTIVE. LAVATORY 111 LT WALL MOUNTED EEL FOUND INOPERATIVE. C ZONE LT LAST SEAT EEL CABLE REPLACED. EMER LT TEST CARRIED OUT & FOUND NORMAL IAW AMM 33-51-13 REV 171. - [SDR CALA2015022093157](https://openairdocs.org/sdr/CALA2015022093157), Feb 18, 2015: LIGHT. INOPERATIVE. DOOR 2 GALLEY LOWER & CTR EMER LIGHT INOPERATIVE. DOOR 2 GALLEY LOWER & CTR EMER LIGHT ASSEMBLY REPLACED. EMER LIGHT TEST GOOD IAW AMM 33-51-12 REV 171. - [SDR CALA2015022093156](https://openairdocs.org/sdr/CALA2015022093156), Feb 18, 2015: FUSE. BLOWN. LEFT FUSE 4 EA OVERWING EMER LIGHT FOUND INOPERATIVE. L3 DOOR EMER BATTERY CHARGER FUSE REPLACED. EMER LIGHT TEST CARRIED OUT & FOUND NORMAL IAW AMM 33-51-04 RE - [SDR CALA2015022093155](https://openairdocs.org/sdr/CALA2015022093155), Feb 18, 2015: FUSE. BLOWN. RIGHT FUSELAGE FWD 4 EA OVERWING EMER LIGHT FOUND INOPERATIVE. R3 DOOR EMER BATTERY CHARGER FUSE REPLACED. EMER LIGHT TEST CARRIED OUT & FOUND NORMAL IAW AMM 33 - [SDR CALA2015022093154](https://openairdocs.org/sdr/CALA2015022093154), Feb 18, 2015: CABLE. DEFECTIVE. UD STAIR WALL MOUNTED EEL FOUND INOPERATIVE. UD STAIR WALL MOUNTED EEL CABLE REPLACED. EMER LT TEST CARRIED OUT & FOUND NORMAL IAW AMM 33-51-12 REV 171. - [SDR CALA2014102192544](https://openairdocs.org/sdr/CALA2014102192544), Oct 19, 2014: CHARGER. INOPERATIVE. IAW A CHECK LT OVERWING LIGHTS 2 EACH AFT, INOPERATIVE. REPLACED BATTERY CHARGER & BATTERY. OPERATIONS CHECKED OK. - [SDR CALA2014090992096](https://openairdocs.org/sdr/CALA2014090992096), Sep 6, 2014: LIGHT. INOPERATIVE. SEAT 9KJ AFT EEL LIGHT INOPERATIVE. REPLACED EEL LIGHT ASSEMBLY. OPERATIONS CHECKED OK. - [SDR CALA2014090992095](https://openairdocs.org/sdr/CALA2014090992095), Sep 6, 2014: WIRE HARNESS. DAMAGED. 33K EEL LIGHT INOPERATIVE. REPLACED EEL LIGHT HARNESS. OPERATIONS CHECKED OK. - [SDR CALA2014070291402](https://openairdocs.org/sdr/CALA2014070291402), Jul 2, 2014: LIGHT. INOPERATIVE. IAW A CHECK SEAT 13AB, ENTIRE SEAT EEL INOPERATIVE. - [SDR CALA2014070291401](https://openairdocs.org/sdr/CALA2014070291401), Jul 2, 2014: PIN. BACKED OUT. IAW A CHECK SEAT EEL AT 19H INOPERATIVE. FOUND PIN PUSHED IN AT CONNECTOR OF EEL LIGHT. - [SDR CALA2014070291400](https://openairdocs.org/sdr/CALA2014070291400), Jul 2, 2014: BATTERY. DISCHARGED. IAW A CHECK, EEL AT MID LAVATORY, CTR EEL, RT EEL, SEATS 24H TO 25H, VERY DIM. REPLACED WHITE BATTERY. OPERATIONS CHECKED OK. - [SDR CALA2014052791162](https://openairdocs.org/sdr/CALA2014052791162), May 27, 2014: DISPLAY. MALFUNCTIONED. FIRST OFFICER`S PFD INOPERATIVE ON LANDING. FOUND R PDF BLANK ON ARRIVAL. CYCLED CB ON OVERHEAD TO RESTORE DISPLAY. AS PRECAUTIONARY CHECKED COOLING VENT & SCRE - [SDR CALA2014050991000](https://openairdocs.org/sdr/CALA2014050991000), May 6, 2014: DISPLAY. FAULTY. FIRST OFFICER`S PFD BLANKED OUT TWICE WITH EICAS, IDS & DU STATUS MSG. REPLACED FIRST OFFICER`S PFD IAW MM 31- 61-02, TEST & OPERATIONS OK. - [SDR CALA2014010290010](https://openairdocs.org/sdr/CALA2014010290010), Dec 31, 2013: PROBE. MALFUNCTIONED. ENG 1 TT2 & PT2 PROBE HEAT FAIL MESSAGE IS ACTIVE. REPLACED NR 1 ENG PT2 &TT2 PROBE. IDLE RUN TEST NR 6 & NR 7 ZIA 42332. - [SDR CALA2013121393661](https://openairdocs.org/sdr/CALA2013121393661), Dec 12, 2013: GUIDE. GOUGED. AUXILIARY GALLEY CART LIFT MAKING VERY LOUD SCRAPING SOUND. CHECK OPERATION OF LIFT CART, FOUND AFT GUIDE RAIL SHOWS SIGNS OF GOUGE STARTING HALFWAY UP & GETTIN - [SDR CALA2013120993551](https://openairdocs.org/sdr/CALA2013120993551), Dec 6, 2013: SENSE LINE. UNSECURE. ENG 3 EEC EICAS CAME ON DEPARTURE. ALL EEC IN ALT MODE IAW PROCEDURE. FOUND EEC SENSE LINE ADRIFT AT NOSE COWL BULKHEAD, DUE TO FLEX LINE ADAPTOR FITTING MISSIN - [SDR CALA2013120293391](https://openairdocs.org/sdr/CALA2013120293391), Nov 28, 2013: PA SYSTEM. MALFUNCTIONED. UPPER DECK PA SPEAKERS SQUEAL WHEN ANY HANDSETS USED, RESET POWER NO HELP. RESET PA CONTROLLER, NO HELP. OEU DISCONNECTED, NO HELP. NEED MORE TIME TO TROUBLESHO - [SDR CALA2013102492363](https://openairdocs.org/sdr/CALA2013102492363), Oct 23, 2013: TIRE. WORN. VERY STRONG VIBRATION ON GEAR RETRACTION IN NOSE. MAJOR VIBRATION OF MCP MORE THAN NORMAL. REPLACED LT TIRE ASSEMBLY IAW AMM, TIRE FOUND WORN. INSPECTED NOSE WH - [SDR CALA2013102492362](https://openairdocs.org/sdr/CALA2013102492362), Oct 23, 2013: MICROPHONE. DEFECTIVE. BOOM MICROPHONE OPERATION IS UNSATISFACTORY AT CAPTAIN`S STATION. SWITCHED TO SPARE MINITEL FOR CAPTAIN'S POSITION. OPERATIONS CHECKED OKAY. REPLENISHED SPARE. - [SDR CALA2013101792159](https://openairdocs.org/sdr/CALA2013101792159), Oct 17, 2013: FAN. VIBRATION. VIBRATION IN FLOOR AREA OF ROWS 56-58 ON RT SIDE, UNABLE TO ISOLATE WITH RECIRCULATING FANS OR GASPER FAN. SUSPECT POSSIBLE LAVATORY GALLEY VENTILATION FAN. DEF All 361: https://openairdocs.org/deregistered/N121UA-2018-01-19/reports.md ## NTSB investigations (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB DCA17WA159](https://openairdocs.org/ntsb/DCA17WA159), Jul 18, 2017: Boeing 747 422 (N121UA), Frankfurt, Germany, incident, no damage ## Other aircraft with N121UA - [Registered now](https://openairdocs.org/aircraft/N121UA): Sikorsky UH-60A, S/N 83-23899 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. 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