Mcdonnell Douglas MD 83

Service difficulty reports · 3,415

Newest first. General aviation reporting is voluntary.

Query with SQL
duckdb -csv -c "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 aircraft_model_key = 'MD83'
  ORDER BY difficulty_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SDR WX0A070822Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AApr 1, 2011 · N864GA · Doug MD83 · Emergency LightingSDR WX0A070820Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 29, 2011 · N871GA · Doug MD83 · Emergency LightingSDR WX0A070811Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 28, 2011 · N865GA · Doug MD83 · Emergency LightingSDR WX0A070816Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 27, 2011 · N875GA · Doug MD83 · Emergency LightingSDR WX0A070805Wire · brokenFLIGHT CREW REPORTED LEFT ENGINE OIL TEMP FLUCTUATED BETWEEN APPROX. 120-152 C'. ADVANCING THE THROTTLE REDUCED TEMPERATURE PER QRH. TEMP WENT UNCONTROLLED TO 199 C'. ENGINE SHUTDOWN PER QRH. ENGINE OIL PRESSURE AND QUANTITY WAS IN THE NORMAL RANGE PRIOR TMar 27, 2011 · N876GA · Doug MD83 · Engine Oil System WiringSDR WX0A070818Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 25, 2011 · N881GA · Doug MD83 · Emergency LightingSDR WX0A070817Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 25, 2011 · N881GA · Doug MD83 · Emergency LightingSDR WX0A070815Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AMar 25, 2011 · N875GA · Doug MD83 · Emergency LightingSDR WX0A070814Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 24, 2011 · N875GA · Doug MD83 · Emergency LightingSDR WX0A070813Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 24, 2011 · N875GA · Doug MD83 · Emergency LightingSDR WX0A070812Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 23, 2011 · N869GA · Doug MD83 · Emergency LightingSDR WX0A070810Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 21, 2011 · N865GA · Doug MD83 · Emergency LightingSDR WX0A070807Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AMar 19, 2011 · N405NV · Doug MD83 · Emergency LightingSDR WX0A070809Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AMar 16, 2011 · N863GA · Doug MD83 · Emergency LightingSDR WX0A070790Door Frame · corrodedMULTIPLE SPOT OF CORROSION ON AFT CARGO DOOR JAMB. REPAIR AFT CARGO DOOR JAMB BEAM IAW MD80 SRM 53-05 FIG 123.Mar 14, 2011 · N410NV · Doug MD83 · Fuselage Main, StructureSDR WX0A070800Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 13, 2011 · N877GA · Doug MD83 · Emergency LightingSDR WX0A070799Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 12, 2011 · N875GA · Doug MD83 · Emergency LightingSDR WX0A070797Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AMar 9, 2011 · N865GA · Doug MD83 · Emergency LightingSDR WX0A070801Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 8, 2011 · N878GA · Doug MD83 · Emergency LightingSDR WX0A070789Unknown · malfunctionedFLIGHT CREW REPORTED, WOULD NOT HOLD RATED PRESSURE AT ALTITUDE WITH OUTFLOW VALVE CLOSED. CABIN CLIMB AT 5-600 FPM AND CABIN ALT AT 9,000 AT FL 29,000, CABIN CONTINUED CLIMBING UNTIL REACHING FL 21,000. MAINTENANCE PERSONNEL PERFORMED OPS CHECK ON PRESSURIZMar 5, 2011 · N861GA · Doug MD83 · Cabin Pressure Control SystemSDR WX0A070798Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 4, 2011 · N875GA · Doug MD83 · Emergency LightingSDR WX0A070795Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 2, 2011 · N416NV · Doug MD83 · Emergency LightingSDR WX0A070794Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 2, 2011 · N875GA · Doug MD83 · Emergency LightingSDR WX0A070792Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 2, 2011 · N408NV · Doug MD83 · Emergency LightingSDR WX0A070793Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERMar 1, 2011 · N416NV · Doug MD83 · Emergency LightingSDR WX0A070791Beam · corrodedMID CARGO PIT DOOR JAMB LOWER BEAM CORRODED OUT OF LIMITS STA 682. REMOVED CORROSION, FABRICATED, LOCATED, DRILLED AND INSTALLED DOUBLER AND REPAIR PARTS IAW MD80, SRM 53-05, FIG 123.Mar 1, 2011 · N410NV · Doug MD83 · Fuselage Miscellaneous StructureSDR WX0A070784Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AFeb 27, 2011 · N875GA · Doug MD83 · Emergency LightingSDR WX0A070782Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AFeb 27, 2011 · N869GA · Doug MD83 · Emergency LightingSDR WX0A070780Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AFeb 27, 2011 · N416NV · Doug MD83 · Emergency LightingSDR WX0A070785Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AFeb 26, 2011 · N876GA · Doug MD83 · Emergency LightingSDR 2ARF201102001Pitot Head · obstructedAIRCRAFT REJECTED TAKE OFF AT 100 KNOTS DUE TO DIFFERENCE OF 20 KNOTS BETWEEN THE ALTIMETERS OF THE CREW. DURING MAINTENANCE REVISION, THE PITOT TUBE WAS DETECTED OBSTRUCTED BY INSECT. THE PITOT TUBE WAS CLEANED AND THE SYSTEM WAS CHECKED BY LEAKS IAW MM 34-11Feb 26, 2011 · N848SH · Doug MD83 · Pitot/Static SystemSDR WX0A07077AWire · damagedREFERENCE MEL 30-20-02 SIT 2 DMI 277729. NOTICED SPARK FROM WIRE ON CAPTAIN'S SIDE, WIRE LIT ON FIRE, SHUT DOWN POWER AND FIRE STOPPED (ANTI-FOG). REMOVED DAMAGED WIRE AND RE-SPLICED WIRES H629E18, H643A18N AND H645A18N IAW SWPM 20-10-03. OPS TESTED ANTI-FOFeb 26, 2011 · N408NV · Doug MD83 · Ice/Rain Protection System WiringSDR WX0A070786Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AFeb 25, 2011 · N879GA · Doug MD83 · Emergency LightingSDR WX0A070781Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AFeb 25, 2011 · N860GA · Doug MD83 · Emergency LightingSDR WX0A070779Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AFeb 25, 2011 · N411NV · Doug MD83 · Emergency LightingSDR WX0A070783Battery Pack · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE AFeb 17, 2011 · N875GA · Doug MD83 · Emergency LightingSDR WX0A070778Battery · dischargedDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE BATTERIES IN THE POWER SUPPLY BATTERFeb 17, 2011 · N410NV · Doug MD83 · Emergency LightingSDR WX0A070777Wire · shortedFLIGHT CREW PERSONNEL NOTICE DURING PRE-DEPARTURE CHECKS, SPARKS FROM WIRES ON CAPTAIN'S SIDE. WIRE LIT ON FIRE. SHUTDOWN POWER AND FIRE STOPPED. MAINTENANCE DEPARTMENT PERSONNEL FOUND WIRING SYSTEM ON CAPTAIN'S CLEARVIEW WINDOW ANTI-FOG SYSTEM SHORTED. CAPPFeb 17, 2011 · N408NV · Doug MD83 · Ice/Rain Protection System WiringSDR WX0A070788Cusp Web · corrodedFLOORBOARD CUSP WEB CORRODED AT FS 200 IN MAIN CABIN LBL 44. REPAIRED CUSP WEB IAW MD80 SRM 53-01 FIG 4.Feb 16, 2011 · N871GA · Doug MD83 · Fuselage Miscellaneous StructureSDR WX0A070787Cusp Web · corrodedFLOOR CUSP WEB CORRODED IN MAIN CABIN FS 215 LBL 15. INSTALLED REPAIR DOUBLER TO FLOOR WEB AS FS 215 LBL 15 IAW MD80 SRM 53-01 FIG 4.Feb 16, 2011 · N871GA · Doug MD83 · Fuselage Miscellaneous StructureSDR WX0A070776Membrane · crackedFWD CABIN FLOOR WEB MEMBRANE CRACKED AT STA 200, RBL 40 TO RBL 46. REMOVED DAMAGED WEB RBL 25 TO RBL 56 STA 200 TO STA 218. FABRICATED, LOCATED, DRILLED AND INSTALLED IAW MD80 SRM 51-30-2 AND SRM 51-30-5.Feb 16, 2011 · N860GA · Doug MD83 · Fuselage Miscellaneous StructureSDR WX0A070775Angle · corrodedCABIN FLOOR UPPER CUSP ANGLE CORRODED AT R1 DOOR JAMB. CUT OUT DAMAGED AREAS, FABRICATED, LOCATED, DRILLED AND INSTALLED CUSP ANGLE, SPLICES SHIMS, DOUBLERS AND FILLERS IAW MD80 SRM 53-05 FIG 55.Feb 16, 2011 · N860GA · Doug MD83 · Fuselage Miscellaneous StructureSDR YYFAN836NKButton · brokenCOCKPIT F/A CALL BUTTON BROKEN.Feb 16, 2011 · N836NK · Doug MD83 · Interphone/Passenger Announcement (PA) SystemSDR WX0A070767Diaphragm · corrodedFWD CABIN MEMBRANE WEB CORRODED AND DENTED STA 200. CUT OUT DAMAGED WEB STA 160 TO STA 200, LBL 10 TO RBL 60. FABRICATED, LOCATED, DRILLED AND INSTALLED WEB REPAIR IAW MD80 SRM 51-70-4 FIG 2.Feb 15, 2011 · N860GA · Doug MD83 · Fuselage Miscellaneous StructureSDR WX0A070766Doubler · corrodedDOOR WEB DOUBLER STA 160 TO STA 200, RBL 54 TO RBL 60 CORRODED. FABRICATED AND INSTALLED NEW DOUBLER IAW MD80 SRM 51-30-2.Feb 13, 2011 · N860GA · Doug MD83 · Fuselage Miscellaneous StructureSDR WX0A070765Membrane · corrodedWEB MEMBRANE RBL 7 TO RBL 40 STA 120 TO STA 150 CORRODED. REMOVED, FABRICATED NEW AND INSTALLED MEMBRANE IAW MD80 SRM 51-70-4 FIG 2.Feb 13, 2011 · N860GA · Doug MD83 · Fuselage Miscellaneous StructureSDR WX0A070764Seat Track · corrodedCOPILOTS INBOARD SEAT TRACK CORRODED. ORDERED AND RECEIVED NEW TRACK, LOCATED AND DRILLED IAW MD80 SRM 51-10-4.Feb 13, 2011 · N860GA · Doug MD83 · Fuselage, Seat/Cargo Attach FittingsSDR WX0A070763Seat Track · corrodedCOPILOTS OUTBOARD SEAT TRACK CORRODED. ORDERED AND RECEIVED NEW TRACK LOCATED AND DRILLED IAW MD80 SRM 51-10-4.Feb 13, 2011 · N860GA · Doug MD83 · Fuselage, Seat/Cargo Attach FittingsSDR WX0A070772Flashlight · inoperativeDURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION MAINTENANCE DEPARTMENT PERSONNEL REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE EMERGENCY FLASHLIGHT ASSY AND MADE AFeb 11, 2011 · N881GA · Doug MD83 · Emergency EquipmentSDR YYFAN836NK1811Pa System · weakAFT F/A POSITION PA WEAK.Feb 9, 2011 · N836NK · Doug MD83 · Interphone/Passenger Announcement (PA) System
Back to Mcdonnell Douglas MD 83