# Service difficulty reports: N2331U A list on [N2331U](https://openairdocs.org/aircraft/N2331U.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. - [SDR CALA2026102120505](https://openairdocs.org/sdr/CALA2026102120505.md): Seal · damaged · Oct 19, 2026 · N2331U · Boeing 777300ER · APU Cowling/Containment > APU MOUNT CHECK, INLET DUCT PLENUM SEAL IS DISTORTED ON LT SIDE. REMOVED APU AIR INLET PLENUM SEAL IAW AMM 49-15-04 & REPLACED IAW AMM 49-15-04-400-801. - [SDR CALA2025102310443](https://openairdocs.org/sdr/CALA2025102310443.md): Battery Pack · no test · Oct 22, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > EMERGENCY EXIT LIGHTS TURNED ON IN THE AIR. FLASHING INTERMITTANTLY. REPLACED FWD EMERGENCY BATTERY M33093 ABOVE DOOR L1. REPLACED AFT EMERGENCY BATTERY M33098 ABOVE DOOR R2 ALL EMERGENCY LIGHTS GROUND TEST PASSED. - [SDR CALA2025100109514](https://openairdocs.org/sdr/CALA2025100109514.md): Battery Pack · discharged · Sep 30, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > R5 (M33408) EMERGENCY POWER SUPPLY BATTERY FOUND LOW CAPACITY. REPLACED R5 (M33408) EMERGENCY POWER SUPPLY BATTERY PACK AND INSTALLATION TEST C/O RESULT FOUND NORMA L REF AMM 33-51-06-960-802 REV104. - [SDR CALA2025100109502](https://openairdocs.org/sdr/CALA2025100109502.md): Battery Pack · discharged · Sep 30, 2025 · N2331U · Boeing 777300ER · Passenger Compartment Lighting > OFCR BACKUP POWER SUPPLY BATTERY, FOUND TO HAVE LOW CAPACITY. REPLACED OFCR BACKUP POWER SUPPLY BATTERY PACK AND TESTED NORMAL IAW AMM 33-29-10-960-810, REV 104. - [SDR CALA2025100109500](https://openairdocs.org/sdr/CALA2025100109500.md): Battery Pack · discharged · Sep 30, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > L2 FWD EMERGENCY POWER SUPPLY BATTERY FOUND TO HAVE LOW CAPACITY. REPLACED THE BATTERY, TESTED NORMAL IAW AMM 33-51-06-960-802, REV 104. - [SDR CALA2025093009444](https://openairdocs.org/sdr/CALA2025093009444.md): Battery Pack · discharged · Sep 29, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > R3 MID (M33305) EMERGENCY POWER SUPPLY BATTERY FOUND LOW CAPACITY. REPLACED R3 MID (M33305) EMERGENCY POWER SUPPLY BATTERY PACK AND TEST,C/O RESULT FOUND NORMAL REF AMM 33-51-06-960-802 REV104. - [SDR CALA2025093009443](https://openairdocs.org/sdr/CALA2025093009443.md): Battery Pack · discharged · Sep 29, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > L2 AFT (M33099) EMERGENCY POWER SUPPLY BATTERY FOUND LOW CAPACITY. REPLACED L2 AFT (M33099) EMERGENCY POWE R SUPPLY BATTERY PACK AND TEST C/O RESULT FOUND NORMAL REF AMM 3 3-51-06-960-802 REV104. - [SDR CALA2025093009442](https://openairdocs.org/sdr/CALA2025093009442.md): Battery Pack · discharged · Sep 29, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > L4 (M33405) EMERGENCY POWER SUPPLY BATTERY FOUND LOW CAPACITY. REPLACED L4 (M33405) EMERGENCY POWER SUPPLY BATTERY AND TEST C/O RESULT FOUND NORMAL REF AMM 33-51-06-960-802 REV104. - [SDR CALA2025093009441](https://openairdocs.org/sdr/CALA2025093009441.md): Battery Pack · discharged · Sep 29, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > R1 (M33094) EMERGENCY POWER SUPPLY BATTERY FOUND LOW CAPACITY, REPLACED R1 (M33094) EMERGENCY POWER SUPPLY BATTERY AND INSTALLATION TEST,C/O FOUND NORMAL REF AMM 33-51-06-960-802 REV104. - [SDR CALA2025093009440](https://openairdocs.org/sdr/CALA2025093009440.md): Battery Pack · discharged · Sep 29, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > OFCR (M33145) BACKUP POWER SUPPLY BATTERY FOUND LOW CAPACITY. REPLACED OFCR (M33145) BACKUP POWER SUPPLY BATTERY PACK AND TEST C/O RESULT FOUND NORMAL REF AMM 33- 29-10-960-810 REV104. - [SDR CALA2025093009434](https://openairdocs.org/sdr/CALA2025093009434.md): Battery Pack · discharged · Sep 29, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > OFAR (M33142) BACKUP POWER SUPPLY BATTERY FOUND LOW CAPACITY. REPLACED OFAR (M33142) BACKUP POWER SUPPLY BATTERY PACK AND INSTALLATION TEST,CO RESULT FOUND NORMA L REF AMM 33-29-12-960-809 REV104. - [SDR CALA2025081807863](https://openairdocs.org/sdr/CALA2025081807863.md): Unknown · odor · Aug 16, 2025 · N2331U · Boeing 777300ER · Air Distribution System > FLT ATTDNT CREW REST HAS SULFUR ODOR NEAR ENTRY DOOR. CONDITION AIR SUPPLIED WITH COOLING PACK IAW AMM 21-00-00-800-803 REV.104, INSPECTION PERFORMED AT AFT CABIN AREA AROUND FLT ATTEND CREW REST, NO SULFUR OR ELECTRIC ODOR AFTER HALF AN HOUR OF PACK OPS. FO - [SDR CALA2025032003000](https://openairdocs.org/sdr/CALA2025032003000.md): Battery Pack · no test · Mar 19, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > EMERGENCY LIGHTS - OPERATIONAL TEST WITH THE TEST SWITCHES PROCEDURE - FOUND BATTERY PACK M33406 INOP. RELATED EMERGENCY LT INOP OVER DOOR AREA, MAIN AISLE, MED 4L EXIT SIGN & MASTER CALL EXIT SIGN MED L& R. REF SSM 33-51-15-103. REPLACED WITH A NEW BATTERY PA - [SDR CALA2025032002993](https://openairdocs.org/sdr/CALA2025032002993.md): Battery Pack · no test · Mar 19, 2025 · N2331U · Boeing 777300ER · Emergency Lighting > EMERGENCY LIGHTS - OPERATIONAL TEST WITH THE TEST SWITCHES PROCEDURE - FOUND LH #3 DOOR OVERWING SLIDE LT INOP. REPLACED PWR PACK ON M33301 EMER PWR SUPPLY AND FUNCTION CHKD ON. PARTS USED: 99-3351-3-0015, QTY:1 - [SDR CALA2022122103451](https://openairdocs.org/sdr/CALA2022122103451.md): Battery Pack · no test · Dec 20, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > EMER LIGHT BATTERY M33143 CAPACITY CHECK FAIL.. EMERG LT BATTERY M33143 REPLACED & TEST CARRIED OUT RESULT NORMAL. - [SDR CALA2022122103450](https://openairdocs.org/sdr/CALA2022122103450.md): Battery Pack · no test · Dec 20, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > DR R4 EMER LIGHT BATTERY M33404 CAPACITY CHECK FAIL. DR R4 EMER LIGHT BATTERY M33404 BATTERY PACK REPLACED AND TESTED NORMAL IAW AMM 33-51-06. - [SDR CALA2022122103449](https://openairdocs.org/sdr/CALA2022122103449.md): Battery Pack · no test · Dec 20, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > DR L5 EMER LIGHT BATTERY M33407 CAPACITY CHECK FAIL WORK. EMERG LT BATTERY M33407 REPLACED & TEST RESULT NORMAL IAW AMM 33-51-06. - [SDR CALA2022122103448](https://openairdocs.org/sdr/CALA2022122103448.md): Battery Pack · no test · Dec 20, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > SUPPORT TASK DR R5 EMER LT BATTERY M33409 CAPACITY CHECK FAIL. DR R5 EMER LT BATTERY M33409 BATTERY PACK REPLACED AND TESTED NORMAL AS PER AMM 33-51-06. - [SDR CALA2022122103447](https://openairdocs.org/sdr/CALA2022122103447.md): Battery Pack · no test · Dec 20, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > DR R3 EMER LIGHT BATTERY M33306 CAPACITY CHECK FAIL.. EMERG LT BATTERY M33306 REPLACED & TEST RESULT NORMAL. - [SDR CALA2022122103446](https://openairdocs.org/sdr/CALA2022122103446.md): Battery Pack · no test · Dec 19, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > DR L4 EMER LIGHT BATTERY M33400 CAPACITY CHECK FAIL. DR L4 EMER LT BATT PACK REPLACED AND OP TEST NORMAL I.A.W AMM 33-51-06. - [SDR CALA2022122103445](https://openairdocs.org/sdr/CALA2022122103445.md): Battery Pack · no test · Dec 19, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > DR L4 EMER LIGHT BATTERY M33405 CAPACITY CHECK FAIL.. DR L4 EMER LT BATT PACK REPLACED AND OP TEST NORMAL I.A.W. AMM 33-51-06. - [SDR CALA2022122103444](https://openairdocs.org/sdr/CALA2022122103444.md): Battery Pack · no test · Dec 19, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > SUPPORT TASK DR L3 EMER LIGHT BATTERY M33302 CAPACITY CHECK FAIL. DR L3 EMER LIGHT BATTERY M33302 BATTERY PACK REPLACED AND TESTED NORMAL AS PER AMM 33-51-06. - [SDR CALA2022122103443](https://openairdocs.org/sdr/CALA2022122103443.md): Battery Pack · no test · Dec 19, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > SUPPORT TASK DR L1 EMER LT BATTERY M33093 CAPACITY CHECK FAIL WORK TRANSFER REF NON ROUTINE WO.1334711 AND ORIGINATOR BY V898181. DR L1 EMER LT BATTERY M33093 BATTERY PACK REPLACED AND TESTED NORMAL AS PER AMM 33-51-06. - [SDR CALA2022122103442](https://openairdocs.org/sdr/CALA2022122103442.md): Battery Pack · no test · Dec 19, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > SUPPORT TASK DR R4 EMER LIGHT BATTERY M33401 CAPACITY CHECK FAIL WORK TRANSFER REF NON ROUTINE WO.1334689 AND ORIGINATOR BY V898181. DR R4 EMER LIGHT BATTERY M33401 BATTERY PACK REPLACED AND TESTED NORMAL AS PER AMM 33-51-06. WORK ACCOMPLISHED BY MECHANIC V898 - [SDR CALA2022121903433](https://openairdocs.org/sdr/CALA2022121903433.md): Skin · damaged · Dec 18, 2022 · N2331U · Boeing 777300ER · Fuselage Main, Plate/Skin > FUSELAGE SKIN DAMAGE AT STA 2108 AT STR 24L. REF LOG PAGE 6945293 FOR INSPECTION OF DAMGE AND WORK ACCOMPLISHED. REPAIR ON OR BEFOR 500 CALANDER DAYS OF PART 3 OF EC/RA 5330-06860 REFE ECRA 5330-06860, REPEAT INSPECTION EVERY 100 FLIGHT CYCLES TOMC-APPROVAL F - [SDR CALA2022121403376](https://openairdocs.org/sdr/CALA2022121403376.md): Charger · inoperative · Dec 14, 2022 · N2331U · Boeing 777300ER · Emergency Lighting > B777-33-3-7019 DR R3 EMER LIGHT CHARGER M33306 TEST FAIL TRANSFER REF NON ROUTINE WO.1262159 AND ORIGINATOR BY V896958 DR R3 EMER LIGHT BATTERY CHARGER M33306 REPLACED AND TESTED NORMAL AS PER AMM 33-51-06 ACCOMPLISHED BY MECH V898181 AND INSPECTED BY V896958 - [SDR CALA2018072301670](https://openairdocs.org/sdr/CALA2018072301670.md): Light · inoperative · Jul 20, 2018 · N2331U · Boeing 777300ER · Emergency Lighting > ON CHK FOUND 2EA EMERGENCY LT INOP. LOCATED LT SEAT 41D AND 46D 2EA EMERGENCY LIGHT ASSY. REPLACED AND LIGHT TESTED OK IAW AMM 33 -51-05. INSPECTION CARRIED OUT CHECK ''SATIS''. - [SDR CALA2017121904530](https://openairdocs.org/sdr/CALA2017121904530.md): Battery · discharged · Dec 19, 2017 · N2331U · Boeing 737322 · Emergency Equipment > FIRST OFFICER FLASHLIGHT WILL NOT TEST. REPLACED FLASH LIGHT BATTERY. - [SDR CALA2017121104401](https://openairdocs.org/sdr/CALA2017121104401.md): Bracket · deformed · Dec 11, 2017 · N2331U · Boeing 777300ER · Emergency Lighting > SEAT 46G EMERGENCY LIGHT LOOSE. FOUND BRACKET FOR LIGHT DEFORMED, SECURED THE BRACKET & OPS CHECKED OK. - [SDR CALA2017120804370](https://openairdocs.org/sdr/CALA2017120804370.md): Light · malfunctioned · Dec 8, 2017 · N2331U · Boeing 777300ER · Emergency Lighting > BELOW 5000 FEET, EMERGENCY EXIT LIGHTS CAME ON BLINKING. GROUND OPS TESTED THE EMERGENCY LIGHT SYS, ALL FUNCTION NORMAL. - [SDR CALA2017092403314](https://openairdocs.org/sdr/CALA2017092403314.md): Light · broken · Sep 24, 2017 · N2331U · Boeing 777* · Emergency Lighting > EMERGENCY LIGHT AND COVER BROKEN OFF SEAT AT 43D. REPLACED EMERGENCY LIGHT ASSEMBLY AT 43D PER MM 33-51-00 OPS CHK OK. - [SDR CALA2017040400808](https://openairdocs.org/sdr/CALA2017040400808.md): Oven · odor · Apr 4, 2017 · N2331U · Boeing 777* · Buffet/Galleys > OVEN OVERHEATS 700 700A WARMING OVEN SMELLS OF ELECTRIC OVERHEAT. MANUAL OFF AND C B PULLED. RESET CIRCUIT BREAKER. OVEN OPERATORS NORMALLY. NO ADVERSE SMELLS NOTED ## 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 = 'N2331U' AND registry_match = 'registration' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/aircraft/N2331U/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.