N66831
Registered owner: UNITED AIRLINES INC, IL (owner ≠ operator)
Operators of this aircraft
Who operated this tail, and how firmly we know it.
| Operator | Role | Period | Basis |
|---|---|---|---|
| UNITED AIRLINES, INC. (CALA) | Operator | on 2025-07-02 | Operator named in NTSB report |
Accident & incident history
Operated by UNITED AIRLINES INC (per NTSB report)
Maintenance disclosures
Service Difficulty Reports filed with the FAA for this airframe. Filing is largely voluntary — the number of reports is not a measure of reliability. To verify a report, search its control number at the FAA SDRS site.
24 reports on file, 2018-01-13 – 2026-08-16.
Part: UNKNOWN — ODOR (CABIN) · airframe 37,187 hrs · 13,612 cycles
STRONG CHEMICAL ODOR, AFT GALLEY. CLEARED ON LANDING. COULD NOT VERIFY ODOR. COMPLETED GENERAL INSPECTIONS OF ALL AREAS IN AND AROUND THE AIRCRAFT FOR ANY MALFORMITIES AND FOUND NONE. CONIDTIONAL INSPECTION OF ACFT WAS PREFORMED IAW AMM TASK 05-51-26-800-801-C1. NO DISCREPANCIES NOTED.
Part: WIRE — CHAFED (ZONE 200) · airframe 37,182 hrs · 13,609 cycles
EMERGENCY LIGHTS, OPS CHECK, FOUND ALL ECONOMY PLUS SEATS AISLE LIGHTS WILL NOT TURN ON DURING TEST (ROW 5-1) IAW WDM 33-51-21-8, FAULT LIKELY ISOLATED FROM M2816 TO M1386, TRIED SLAVING IN NEW BATTERIES IAW AMM 33-51-06-960-805, 2 NEW POWER SUPPLIES, & 2 KNOWN GOOD POWER SUPPLIES FROM ZONE B ON ACFT IAW AMM 33-51-06-960-806. FIRST CLASS EMERGENCY LIGHTS WERE DISCONNECTED & MOMENTARILY WENT ON AT ROW 1 WHEN TESTING NEW POWER SUPPLY AND WENT OUT AGAIN AS FIRST CLASS LIGHTS WERE CONNECTED TO ROW 3. FAULT LIKELY REQUIRES FURTHER WIRING CHECKS IAW FIM 33-50, TASK 801. ELECTRICAL CONNECTOR TO M2816 POWER PACK REMAINS DISCONNECTED AT CLOSE OUT CEILING PANEL & EMERGENCY AISLE LIGHTS DISCONNECTED FROM ROWS 2-5 CHKD WIRE CONTINUITY FROM CONNECTOR D14812 AT EMERGENCY BATTERY PACK M2816, PIN 12 TO CONNECTOR D12052 PIN 2. CONTINUITY CHKD GOOD. CHECKED FOR GROUND AT D12052 PIN 5. CHKD GOOD. T/S IAW FIM 33-50, TASK 801, & FOUND 4 CHAFED WIRES ADJACENT TO FLOOR PROXIMITY LIGHTS AT FIRST CLASS SEAT 5B. REPAIRED WIRES IAW SWPM 20-30-12 AND WDM 33-51-12-8. FOLLOWED AMM 33-51-11 FOR FLOOR PROXIMITY LIGHT ASSY. EMERGENCY LIGHTS IN CABIN ARE NOW GOOD, OPS CHKD OKAY.
Part: POWER SUPPLY — INOPERATIVE (ZONE 200) · airframe 36,786 hrs · 13,443 cycles
FIRST CLASS EMERGENCY PROXIMITY LIGHTS INOP REMOVED AND REPLACED POWER SUPPLY PER MM 33-51-06-960-806 LIGHTS OPERATE NORMALLY
Part: BATTERY PACK — INOPERATIVE (ZONE 200) · airframe 36,722 hrs · 13,410 cycles
ENTIRE SECTION OF FIRST-CLASS SEAT-MOUNTED EMERGENCY LIGHTS IS INOP. REMOVED AND REPLACED EMERGENCY LIGHTS BATTERY AND CHARGER. PERFORMED OPS CHECK. OPS CHECK GOOD. REF AMM 33-51-06.
Part: UNKNOWN — ODOR (CABIN) · airframe 35,782 hrs · 13,002 cycles
CHEMICAL ODOR IN FLT DECK ON TAKE OFF & APPROACH 0 TO 14000FT. NO ODOR WITH PACK 1 OFF. ACCOMPLISHED INITIAL INSPECTION OF LT ECS PACK BAY, NO DEFECT NOTED, INSPECTED APU INLET, EXHAUST AND INTERIOR COMPT, NO DEFECT NOTED, ENG INLET & EXHAUST, FWD ACCESSORY & E & E BAY, NO DEFECT NOTED , RUN PACKS WITH APU BLEED FOR 1 HR & THEN WITH ENGINE BLEED FOR 15 MINS AT IDLE , NO CHEMICAL OR ANY OTHER ODOR DETECTED, COULD NOT DUPLICATE FAULT IAW AMM TASK 05-51-26-800-801-C1.
Earlier reports · 2018–2025 · 19 reports
2025
Part: CIRCUIT BREAKER — TRIPPED · airframe 34,865 hrs · 12,632 cycles
CLIMBING THRU 14K CAB ALT WARN. MAX CAB 11K VALVE L/R CKT BKRS FOUND POPPED AFTER LANDING FOUND DURING T/S SYSTEM R&L ON P-6 PANEL 2EA C/B POPPED ROW A-7 & B-7 RESET C/B'S OPENED ENG 1 & ENG 2 REVERSER HALF'S AND INSPECTED 5TH STAGE VALVES FOR CONDITION AND PROPER INSTALLATION ALL FOUND NORMAL CREW RAN ENGS ABOVE IDLE ALL NORMAL INDICATIONS PER AMM 36-00-00-860-804.
Part: SKIN — DAMAGED (ZONE 100) · airframe 34,848 hrs · 12,624 cycles
REF LOG PAGE 5420901 FOR REPAIR OF TAILSTRIKE DAMAGE TO AFT LOWER FUSELAGE. R & R SKIN ACCOMPLISHED. OK TO CLEAR.
Part: BATTERY PACK — FAULTED (ZONE 200) · airframe 34,843 hrs · 12,622 cycles
EMERGENCY LIGHTING SYSTEM OPERATIONAL CHECK. ROW 8CBA-14CBA EMERGENCY LIGHTS INOPERATIVE. REMOVED AND REPLACED MID EMERGENCY LIGHT BATTERY POWER SUPPLY IAW AMM 33-51-06-960-805 OPS CHECK GOOD.
Part: STOP — FAULTED (GIRT BAR) · airframe 34,843 hrs · 12,622 cycles
REMOVED GIRT BAR STOP RELEASE. INSTALLED FWD RELEASE STOP ASSEMBLY ON ESCAPE SLIDE GIRT BAR AT DOOR 1L. ALSO APPLIED RED TAPE, REF AMM 25-66-01-000-804.
Part: SLIDE — NO DISCREPANCY (ZONE 800) · airframe 34,749 hrs · 12,592 cycles
REMOVED DOOR 2L ESCAPE SLIDE PACK AND INFLATION CYLINDER PINNED IAW AMM 25-66-01-000-801 REF LOGPAGE 5282032 REINSTALLED ORIGINAL SLIDE. REMOVED AND STOWED CYLINDER PIN PER AMM 25-66-01-400-801 C/W RII REQUIREMENTS FOR DOOR 2L SLIDE REINSTALLATION. REF AIPC 25-66-00-15
Part: CHECK VALVE — FAULTY (ZONE 100) · airframe 33,990 hrs · 12,289 cycles
NITROGEN GEN SYSTEM DEGRADED TO BLUE LIGHT. BLUE LIGHT ON. COMPLIED WITH MEL 4701. APPROVED PLACED ITEM ON MEL 4701B. DISCONNECTED OXY SENSOR INLET TUBE FROM SENSOR IAW 47-42-03-020. SMELLS OF FUEL. REPLACING SECONDARY BACKFLOW PREVENTION CHECK VALVE. REMOVED AND REPLACED SECONDARY BACKFLOW PREVENTION CHECK VALVE IAW 47-21-04-400-803. OPS CHECK GOOD IAW 47-00-00-790-802. BLUE DEGRADED LIGHT EXTINGUISHED GREEN LIGHT ILLUMINATED. READY TO CONTINUE.PARTS USED: 29-4721-9-0001, QTY :1 ROTABLE PARTS CHG:TT # 1358367 SN OFF 0831 PN OFF 29-4721-9-0001 IPC REFERENCE # NO COMPONENT FOUND.VALVE, CHECK, 0 OFF 29-4721-9-0001 3889 ON 29-4721-9-0001 9909 PERFORMED IDT INSP OF ALI ITEM OF NEADS LINE LEAK CHECK PER AMM 47-00-00-790-802. CHECK OK.
2024
Part: NONE — NO DISCREPANCY (NONE) · airframe 33,292 hrs · 12,014 cycles
L/H AFT MIDDLE EMER ESCAPE DOOR OPENED TO FOM INSP REQ L/H AFT EMER ESCAPE DOOR CLOSED OPNS CHEKED SATIS. IAW AMM 52-22-00 OVERWING ESCAPE DOOR CLOSURE NOT INSPETION ITEM.
Part: FILTER — ODOR (RECIRC FAN) · airframe 31,523 hrs · 11,268 cycles
IN CRUISE FLT ATTENDANTS REPORT AMMONIA/PLASTIC SMELL. EXECUTED SMOKE FIRE FUMES QRH. RECIRCULATION FAN FILTER REPLACED IAW AMM PUNGENT SMELL WAS DETECTED. RAN THE AIRCRAFT 21-25-01. ENGINES HIGH POWER RAN IN REFERENCE WITH BOEING AMM ENGINES. BOTH PACK SYSTEM CHECKED IN REFERENCE WITH BOEING AMM21-51-00. ALL FOUR EMPLOYEES WALK THROUGH THE AIRCRAFT,
Part: TRANSMISSION — UNDERSERVICED (TE FLAPS) · airframe 31,458 hrs · 11,246 cycles
FLAPS WOULDNT EXTEND BEYOND 5 DEGREES ON APPROACH. GO AROUND W/C HECKLIST FLAPS NORMAL IDICATORS EXTENDED ON BOTH OUTBOARD TRANSMISSIONS. FLUID NOT SERVICED ON ANY OF THE TRANSMISSIONS A/C MOVED OFF GATE. TRANSMISDIONS 1 AND 8. CYCLED FLAPS TO FULL 40. NO DEFECTS OR DAMAGE FOUND. PERFORMED BITES IN FESU. TRAILING EDGE GROUND TEST 27-51 TASK 818 TEST PASSED. ASYMMETRY TEST 27-51 TASK 819 PASSED. WHEN CHECKING FLAP TRANSMISSION TORQUE IDICATION FOR TASK 27-51 TASK 849 FOUND PERFORMED TROUBLESHOOT IAW FIM 27-51 TASK 849 STEP D RESETED #1 GOOD AT THIS TIME A/C OK TO CONTINUE. AND #8 TRAILING EDGE FLAPS TRANSMISSION TORQUE TRIP INDICATOR. SERVICED #1 AND #8 TRAILING EDGE FLAP TRANSMISSION IAW AMM 12-22-51. EXTEND AND RETRACT FLAPS IAW AMM 27-51-00 OPS CHECKED.
Part: ELECTRONIC UNIT — FAULTED (FLAPS) · airframe 30,764 hrs · 10,979 cycles
FLAP 5 INDICATED WITH FLAP AT 15 RAN DISAGREE CHEKLIST LANDED FLAP 15 LOCKED DUE EMERGENCY DECLARED COMPLIED WITH FIM TASK 27-88 TASK 819. WIRING CHECKS COMPLIED WITH WITH NO FAULTS INDICATED AND FSEU REPLACED PRECAUTIONARY. UNLOCKING LOGPAGE ACCOMPLISHED FIM 27-88 TASK 819. ASYMMETRY TEST ALSO PASSED. ACCOMPLISHED OPS CHECK OF FLAP SLAT SYSTEM. OPS CHECK GOOD. ACP WIRING CHECKS FOR FIM 27-88 TASK 819. WIRING CHECKS WERE GOOD. NO DISCREPENCIES FOUND. TOMC STILL WANTS THE FSEU REPLACED. ORIGINAL BOX SHOWS NO EXISTING FAULTS ON FSEU.
2023
Part: FLOORBEAM — CORRODED (STA 947 RBL 53) · airframe 29,725 hrs · 10,567 cycles
B737-06-3-0050 MAIN CABIN FLOOR BEAM HAS CORROSION STA 947 RBL 53.
2022
Part: NONE — FAULTED (NA) · airframe 24,884 hrs · 8,836 cycles
FMC VNAV CLIMB MODE INDICATES FLAPS 1 MIN SPEED WITH FLAPS AT 0 NOT ATTEMPT A CB RESET OR FMC TRANSFER. CREW HAD NO OTHER ALSO NO FAULTS. ABNORMAL INDICATIONS AND FLAPS INDICATED CORRECT WITH FLAP HANDLE POSITION FLIGHT CREW REPORTEDAT 10K FT. THEY PUT FLAPS ALL THE WAY UP AT PER FLIGHT CREW AUTOPILOT NOT ENGAGED FOUND DFCS FAULT ON LAST FLIGHT LEG. "22-11822" SAME FAULT ON PSEU BITE SHOWED NO FAULTS AS WELL BOTH SMYD 1 AND 2 SHOWED "FMC DATA INVALID" FAULTS MX MSG 0 AND FMC WAS STILL INDICATING "CLIMB" PHASE WITH MAX SPEED BOTH CH A AND B. REF FIM 22-11 TASK 811 PERFORMED DFCS CURRENT 27-31026 AND 27-32026. SMYD FLAP POSITION DISCRETES SHOWED ALLOWED 250KNOTS. THEY DESCENDED BACK TO 10K FT AND CYCLED FLAPS FAULTS AND TEST PASSED, PERFORMED ADIRS BITE TEST AND NO FAULTS CORRECT WITH FLAP POSITION TO SEVERAL POSITIONS 1-5AND BACK TO 0 AND NO CHANGE. THEY DID AND ENG 1 AND 2 EEC BITE AND NO FAULTS, DEU 1 AND 2 BITE AND REPLACED FMC# 1 PER AMM 34-61-02 . PERFORMED SOFTWARE CROSSLOAD AND VERIFIED SOFTWARE AS CORRECT PER LRU SOFTWARE NON 787 CONFIGURATION PAGES. FMC #1 BITE PASSED. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1017823 SN OFF 3159 COMPUTER, FLT M OFF 29-3461-9-0001 3159 ON 29-3461-9-0001 0276
Part: FMC — FAULTY (RH AND LH) · airframe 24,884 hrs · 8,836 cycles
*EMERGENCY DECLARED* BOTH FMC DIED AFTER LAND DURRING TAXI IN RIGHT FMC SHOWS INOP. RIGHT FMC PLACED ON MEL.TOMC APPROVES THE USE OF MEL 3436E FOR RIGHT FMC INOP RH FMC REPLACED. REF LOG PAGE 8121047 . OP CHECKS OK. MEL CLEARED.
2021
Part: FAN — OVERSERVICED (NR 1 ENGINE) · airframe 21,336 hrs · 7,574 cycles
SMOKE OR FUMES IN CABIN SOURCE UNKNOWN RIGHT AFTER T/O UNTIL 20000 FEET IN CLIMB NON-ELECTRICAL SMELL OF OIL OR EXHAUST COMPLETE VISUAL INSPECTION OF BOTH ENGINES INLET AND EXHAUSTS. NOTE ANY FOREIGN MATTER AND IF FOUND TAKE PICTURES. PAY PARTICULAR ATTENTION TO THE FAN BLADES OF ENGINE 1 WHICH HAD A FAN LUBE 12/31/2020 IN EWR, REF LP 5670091. IF ANY RESIDUAL FAN LUBE IS FOUND, TAKE PICTURES AND FORWARD TO ESCPP. 847-7008324 OPT 4. VISUALLY INSPECTED INLETS AND EXHAUSTS OF NR 1 AND NR 2 ENGINES AND FOUND NR 1 ENGINE TO HAVE RESIDUAL FAN LUBE ON 1ST STAGE FAN BLADES. RAN ENGINES AND APU ISOLATED EACH AS A SOURCE OF AIR WITH PACKS RUNNING AND PERFORMED PACK BURNOUT, PER MM21-00-01. HAD NO SMELL IN CABIN OR COCKPIT. SUSPECT RESIDUAL LUBE ON NR 1 ENGINE AS CAUSE FOR ODOR.
2020
Part: FLOORBEAM — CORRODED (BS 500B) · airframe 20,853 hrs · 7,404 cycles
FWD CARGO COMPT MAIN CABIN FLOOR BEAM LOWER SURFACE STA 500B LBL 34 HAS CORROSION (DOT #212-022) REF. REPAIRED FLOOR BEAM LOWER SURFACE AT STA BS 500B LBL 34 REF ECRA 5351-02039.
Part: ATTACH ANGLE — DAMAGED (BS 663) · airframe 20,853 hrs · 7,404 cycles
WING CENTER SECTION REAR SPAR VAPOR BARRIER ATTACH ANGLE CRACKED AT STA.663 AND RBL 10 APPROX. REF. REPAIRED DAMAGED SECTION AT WING CENTER REAR SPAR VAPOR BARRIER ATTACH ANGLE BS 663 RBL8 TO RBL24, REF. B737-900 SRM 57-10-10- REP. 5 REF.
Part: ATTACH ANGLE — DAMAGED (N/A) · airframe 20,853 hrs · 7,404 cycles
WING CENTER SECTION REAR SPAR VAPOR BARRIER ATTACH ANGLE CRACKED AT STA. 663 AND LBL10 REF. REPAIRED DAMAGED SECTION AT WING CENTER REAR SPAR VAPOR BARRIER ATTACH ANGLE BS 663 LBL8 TO LBL24, REF. B737-900 SRM 57-10-10- REP. 5 REF.
Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHTS) · airframe 20,850 hrs · 7,403 cycles
EMERGENCY BATTERY PACK M1694 INOP. REMOVED AND REPLACED M1694, AS PER AMM 33-51-06-960-805. OPS CHECKS NORMAL.
2018
Part: ARMING LEVER — MALFUNCTIONED (L1 DOOR) · airframe 12,669 hrs · 4,446 cycles
HAD ISSUES WITH DISARMING THE L1 DOOR SLIDE, BUT ABLE TO DO SO. CYCLED THE L1 DOOR SLIDE, ARMED AND DISARMED NORMAL.