Boeing 747-251B

Service difficulty reports · 827

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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 = '747251B'
  ORDER BY difficulty_date DESC"

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SDR 9515246611Fittings · corrodedDURING PERIODIC CHECK, FOUND CORROSION IN THE LBL 120 TO 125 OVERWING LONGERON AT THE FORWARD AND AFT UPLOCK SUPPORT CASTINGS, BS 1301 AND 1309. REPLACED FITTINGS (P/N 65B01332-7, 65B01331-15), PER SRM 53-10-01 FIG 1.Oct 3, 1995 · N611US · Boeing 747251B · Fuselage Miscellaneous StructureSDR 9514926627Bleed Valve · malfunctionedDURING CLIMB, THE NR 3 ENGINE NACELLE TEMPERATURE PEAKED AND THE ENGINE FIRE WARNING ACTIVATED. THE ENGINE WAS SHUTDOWN, THE FIRE BOTTLES WERE DISCHARGED, AND THE AIRCRAFT RETURNED TO NRT WHERE AN UNEVENTFUL LANDING WAS ACCOMPLISHED. THE HIGH STAGE BLEED VALSep 29, 1995 · N627US · Boeing 747251B · Compressor Bleed ValveSDR 9514296623Relay · malfunctionedTHIRTY MINUTES INTO FLIGHT ESSENTIAL BUS POWER LIGHT ILLUMINATED. THE PROBLEM CONTINUED ON AND OFF FOR SEVERAL MINUTES AND GOT WORSE. CREW FOLLOWED COCKPIT OPERATING PROCEDURE, DUMPED 55,000 LBS OF FUEL AND RETURNED TO LAX. MAINTENANCE REPLACED R79 RELAY, RSep 16, 1995 · N623US · Boeing 747251B · AC Generation SystemSDR 9514716624Skin · corrodedDURING PERIODIC CHECK, FOUND CORROSION ON THE RIGHT WING LOWER SKIN FORWARD OF THE FRONT SPAR, FS 1309 AT THE LEADING EDGE TENSION ROD FITTING PAD. REPAIRED PAD PER EA 66-99086.Sep 15, 1995 · N624US · Boeing 747251B · Wing, Plate/SkinSDR 9514696624Skin · crackedDURING PERIODIC CHECK, FOUND A PREVIOUS REPAIR CRACKED AND DISBONDING ON THE RIGHT WING INBOARD MIDFLAP LOWER FORWARD PANEL, WBL 210. REPAIRED PANEL (P/N 65B08426-202), PER EA 66-80179.Sep 14, 1995 · N624US · Boeing 747251B · Trailing Edge FlapsSDR 9514326638Tire · failedDURING LANDING, THE RIGHT BODY GEAR NR 12 TIRE BLEW. THE CREW WAS ABLE TO TAXI THE AIRCRAFT TO THE GATE AREA. FOUND DAMAGE TO THE RIGHT BODY GEAR STRUT DOOR AND STRUCTURE AREA OF THE BODY GEAR. MAINTENANCE REPLACED NR 11 AND NR 12 MAIN WHEEL ASSEMBLIES AND Sep 14, 1995 · N638US · Boeing 747251B · TireSDR 9514626624Skin · crackedDURING PERIODIC CHECK, FOUND A .25 INCH CRACK IN THE NR 1 PYLON INBOARD SKIN AT NACELLE STATION 175, WATER LINE 151. REPAIRED SKIN PER EA 66-99085.Sep 9, 1995 · N624US · Boeing 747251B · Nacelle/Pylon, Plate/SkinSDR 9514156624Fitting · crackedDURING PERIODIC CHECK, FOUND A CRACK IN THE NR 3 STRUT DIAGONAL BRACE FORWARD ATTACH FITTING. REPLACED FITTING.Sep 9, 1995 · N624US · Boeing 747251B · Nacelle/Pylon StructureSDR 9513586636Engine · failedEN ROUTE JFK-NRT, THE NR 4 ENGINE OIL PRESSURE WENT TO ZERO AND OIL QUANTITY PEGGED OFF SCALE. CREW FOLLOWED COCKPIT OPERATING MANUAL, SHUTDOWN NR 4 ENGINE AND DIVERTED TO MSP WITHOUT FURTHER INCIDENTS. MAINTENANCE REPLACED THE ENGINE AND TEST WAS NORMAL.Aug 31, 1995 · N636US · Boeing 747251B · Engine (Turbine/Turboprop)SDR 9512536637Bleed Valve · malfunctionedDURING TAKEOFF THE NR 3 ENGINE EXPERIENCED A FIRE WARNING WITH THE NACELLE TEMPERATURES GOING INTO THE RED AND AT 115 KNOTS TAKEOFF WAS ABORTED. THE EGT HAD GONE TO 715 DEGREES FOR 15 SECONDS AND A BORESCOPE INSPECTION WAS PERFORMED. THE HIGH STAGE BLEED VALAug 13, 1995 · N637US · Boeing 747251B · Compressor Bleed ValveSDR 9511386614Compressor · stalledDURING TAKEOFF ROTATION, THE NR 3 ENGINE EXPERIENCED A COMPRESSOR STALL WITH THE EGT GOING TO MAX AND THE ENGINE WAS SHUTDOWN. DUMPED 100,000 LBS OF FUEL AND THE AIRCRAFT RETURNED TO MSP WHERE AN UNEVENTFUL THREE ENGINE LANDING WAS ACCOMPLISHED. THE ENGINE WJul 26, 1995 · N614US · Boeing 747251B · Turbine Engine Compressor SectionSDR 9511726623Skin · delaminatedDURING LINE CHECK, FOUND 2 FT BY 3 FT DELAMINATION ON THE NR 7 SPOILER. REPLACED SPOILER (P/N 65B02310-1).Jul 25, 1995 · N623US · Boeing 747251B · SpoilersSDR 9510256622Sequence Valve · leakingDURING CLIMB AND GEAR RETRACTION, THE RED GEAR LIGHT REMAINED ILLUMINATED. AIRCRAFT DUMPED APPROXIMATELY 140,000 LBS OF FUEL AND RETURNED TO KIX. UPON INSPECTION, FOUND THE RIGHT WING GEAR SEQUENCE VALVE LEAKING. ALSO, FOUND 6 BROKEN CLAMPS. TIGHTENED LOOSJul 1, 1995 · N622US · Boeing 747251B · Landing Gear Retraction/Extension SystemSDR 9510346614Anti-Skid Module · leakingDURING CLIMB AND GEAR RETRACTION, THE NR 4 HYDRAULIC SYSTEM QUANTITY DECREASED TO 1 GALLON. THE CREW DUMPED APPROXIMATELY 100,000 LBS OF FUEL, RETURNED TO MSP, AND LANDED WITHOUT INCIDENT. REPLACED THE LEFT BODY GEAR ANTI-SKID CONTROL MODULE, LEAK AND OPERAJun 30, 1995 · N614US · Boeing 747251B · Brake Anti-Skid SectionSDR 9510246626Nr 1 Ac/Dc Bus · elect smokeDURING CRUISE, A BURNING ELECTRICAL SMOKE WAS DETECTED IN THE COCKPIT. THE CREW FOLLOWED PROCEDURES AND ISOLATED THE NR 1 GENERATOR, DUE TO HIGH LOAD AND ISOLATED THE NR 1 AC AND DC BUS, THE SMOKE DISSIPATED. AIRCRAFT CONTINUED WITHOUT FURTHER INCIDENT. PERJun 30, 1995 · N626US · Boeing 747251B · AC Generation SystemSDR 9509526626Engine · failedDURING CLIMB, THE NR 3 ENGINE DEVELOPED LOW EPR, N1 AND FUEL FLOW WITH HIGH EGT. THE ENGINE HAD NO RESPONSE TO POWER LEVER MOVEMENT. THE AIRCRAFT BEGAN A RETURN TO NRT, DUMPING 170,000 LBS OF FUEL. DURING DESCENT, THE ENGINE EXPERIENCED A COMPRESSOR STALL AJun 16, 1995 · N626US · Boeing 747251B · Engine (Turbine/Turboprop)SDR 9509506615Door · missingDURING DESCENT INTO NRT AT 15,000 FT, A LARGE BANG SOUND AND VIBRATION WAS EXPERIENCED. AFTER LANDING, FOUND THE NR 2 AIR CONDITION PACK ACCESS DOOR PANEL MISSING. ALSO, FOUND DAMAGE TO NR 3 AND NR 4 CANOE AND FUSELAGE PANEL 191KL. REPLACED THE NR 2 PACK DOJun 15, 1995 · N615US · Boeing 747251B · Air Conditioning DoorsSDR 9509316631Tire · flatAFTER FLIGHT 17 TAKEOFF AT JFK, OPERATIONS AT JFK ADVISED DISPATCH THAT TIRE PIECES WERE FOUND ON THE RUNWAY. FLIGHT DIVERTED TO ANC. MAINTENANCE INSPECTED AIRCRAFT AND FOUND THE NR 8 TIRE RECAP MISSING AND FLAT. REPLACED THE NR 7 AND NR 8 MAIN TIRE AND WHEJun 9, 1995 · N631US · Boeing 747251B · TireSDR 9508686622Start Valve · failedDURING DESCENT AT FL240, THE NR 3 ENGINE START VALVE LIGHT ILLUMINATED. THE ENGINE WAS SHUTDOWN AND THE AIRCRAFT CONTINUED TO MSP WHERE AN UNEVENTFUL THREE ENGINE LANDING WAS ACCOMPLISHED. THE START VALVE AND PRESSURE SWITCH WERE REPLACED AND THE SYSTEM OPERMay 27, 1995 · N622US · Boeing 747251B · Engine Start Valves/ControlsSDR 9508636637Ins · malfunctionedDURING CRUISE, THE NR 1 AND NR 2 INS RED WARNING LIGHT ILLUMINATED CONSECUTIVELY. CREW FOLLOWED COCKPIT OPERATING MANUAL AND DIVERTED FLIGHT TO ANC. MAINTENANCE REPLACED THE NR 1 INS AND PERFORMED CHECK, CHECK WAS NORMAL. THE NR 1 INS RED WARNING LIGHT ILLUMay 27, 1995 · N637US · Boeing 747251B · Inertial Guidance SystemSDR 9509006622Spar Web · corrodedDURING PERIODIC CHECK, FOUND CORROSION ON THE RIGHT WING FRONT SPAR WEB FSSI 556 - 562. REPAIRED PER EA 66-98544.May 23, 1995 · N622US · Boeing 747251B · Wing SparSDR 9508226625Retract Mech · reqd serviceDURING CLIMB, THE RIGHT BODY GEAR TILT LIGHT ILLUMINATED AND GEAR WOULD NOT RETRACT IN BOTH PRIMARY AND ALTERNATE. CREW FOLLOWED COCKPIT OPERATING MANUAL AND PROCEEDED FOR LANDING WITHOUT FURTHER INCIDENT. MAINTENANCE BLED THE SYSTEM AND RECYCLED CIRCUIT BREMay 20, 1995 · N625US · Boeing 747251B · Landing Gear Retraction/Extension SystemSDR 9508216625Line · chafedDURING CLIMB, THE RIGHT BODY GEAR TILT LIGHT ILLUMINATED AND BOTH PRIMARY AND ALTERNATE GEAR WOULD NOT RETRACT. CREW FOLLOWED COCKPIT OPERATING MANUAL PROCEDURE AND MADE AN UNEVENTFUL LANDING IN MNL. MAINTENANCE FOUND RIGHT TILT ACTUATOR HYDRAULIC LINE CHAFEMay 20, 1995 · N625US · Boeing 747251B · Landing Gear Retraction/Extension SystemSDR 9508406622Chord · corrodedDURING PERIODIC CHECK, FOUND CORROSION IN THE RIGHT WING FRONT SPAR WEB FSSI 1023 AND ON THE LOWER T-CHORD AT FSSI 1019 AND 1027. REPAIRED PER EA 66-98527.May 19, 1995 · N622US · Boeing 747251B · Wing SparSDR 9508566622Skin · crackedDURING PERIODIC CHECK, FOUND A CRACK IN THE NR 2 PYLON INBOARD SKIN, NACELLE STA 174, NACELLE WL 151. REPAIRED PER EA 66-098523.May 17, 1995 · N622US · Boeing 747251B · Nacelle/Pylon, Plate/SkinSDR 9508066611Transmission · failedDURING CLIMBOUT, THE OUTBOARD TRAILING EDGE FLAPS WOULD NOT RETRACT PAST 10 DEGREES IN NORMAL OR ALTERNATE POSITION. CREW FOLLOWED COCKPIT OPERATING MANUAL, DUMPED 58,000 LBS OF FUEL, AND MADE AN UNEVENTFUL LANDING IN NRT. MAINTENANCE REPLACED SCREW ASSEMBLYMay 16, 1995 · N611US · Boeing 747251B · Trailing Edge Flap Control SystemSDR 9507906611Dnlock Actuator · malfunctionedDURING APPROACH FOR LANDING AND AFTER LOWERING THE LANDING GEAR, EXPERIENCED RAPID LOSS OF HYDRAULIC FLUID ON NO.1 SYSTEM. HYDRAULIC PRESSURE DECREASED TO ZERO AND BOTH LOW PRESSURE AND QUANTITY LIGHTS ILLUMINATED. CREW FOLLOWED COCKPIT OPERATING MANUAL PROCEDMay 12, 1995 · N611US · Boeing 747251B · Landing Gear Retraction/Extension SystemSDR 9507406614Packing · cutDURING CRUISE, THE NR 2 ENGINE OIL QUANTITY DROPPED TO ZERO. THE ENGINE WAS SHUTDOWN, 90,000 LBS OF FUEL WAS DUMPED, AND THE AIRCRAFT DIVERTED TO ANC WHERE AN UNEVENTFUL THREE ENGINE LANDING WAS ACCOMPLISHED. A DAMAGED PACKING WAS REPLACED ON THE ANGLE GEARBMay 6, 1995 · N614US · Boeing 747251B · Turbine Engine Accessory DriveSDR 9507216613Bulkhead · crackedDURING PERIODIC CHECK, FOUND A CRACK AND CORROSION IN THE SLANTED PRESSURE PANEL LOWER EDGE FS 1241, RBL 76. REPAIRED PER EA 66-97906.Apr 29, 1995 · N613US · Boeing 747251B · Fuselage Main, BulkheadSDR 9506706615Epr Indication · malfunctionedDURING TAKEOFF ROLL BELOW 60 KTS (TPE), THE NR 4 ENGINE HAD SLOW EPR RISE AND THE TAKEOFF WAS ABORTED. AN EPR CHECK BY THE CREW ON THE TAXIWAY CHECKED OK AND A NORMAL TAKEOFF WAS THEN MADE. THE ENGINE WAS INSPECTED. ALL SENSE LINES AND ELECTRICAL CONNECTORSApr 25, 1995 · N615US · Boeing 747251B · Engine Pressure Ratio (EPR)SDR 9506556613Skin · crackedDURING PERIODIC CHECK, THE NOSE WHEEL WELL ACCESS RIGHT FORWARD HINGE FAIRING WAS FOUND CRACKED. REMOVED CRACK FROM OUTER SKIN, STOP DRILLED CRACK ON INNER SKIN. INSTALLED DOUBLER AND TRIPLER AND QUADRUPLER PER SA 5311-01064-6.Apr 25, 1995 · N613US · Boeing 747251B · Fuselage Main, Plate/SkinSDR 9506416613Blkhd Web · corrodedDURING PERIODIC CHECK, THE LEFT BODY GEAR WHEEL WELL BULKHEAD WEB AT FS 1480 WAS FOUND CORRODED. REMOVED CORROSION, ROTO PEENED, TREATED, PRIMED, AND INSTALLED STRUCTURE PER EA 66-98011.Apr 24, 1995 · N613US · Boeing 747251B · Fuselage Main, BulkheadSDR 9506286613Floor Beam · corrodedDURING PERIODIC CHECK, THE FLOOR BEAM AT FS 660, BL 0 WAS FOUND CORRODED. REPLACED FLOOR BEAM FROM RBL 56 TO LBL 47 AT FS 66 PER EA 66-98000.Apr 20, 1995 · N613US · Boeing 747251B · Fuselage Main, Floor BeamSDR 9506276613Carriage · crackedDURING PERIODIC CHECK, THE RIGHT INBOARD TRAILING EDGE FLAP NR 5 CARRIAGE THRUST BEARING BORE WAS FOUND CORRODED AND CRACKED. MACHINED CORROSION, COMPLETED HFEC, FLAP PEENED BORE, AND INSTALLED WET BUSHING, BORE TREATED AND PRIMED PER EA 66-97885.Apr 20, 1995 · N613US · Boeing 747251B · Trailing Edge FlapsSDR 9506216613Bracket · crackedDURING PERIODIC CHECK, FOUND CRACKED SHEAR TIE BETWEEN STR 10R AND 11R, FS 1220. REMOVED CRACKED SHEAR TIE, FABRICATED REPAIR, AND INSTALLED.Apr 18, 1995 · N613US · Boeing 747251B · Fuselage Miscellaneous StructureSDR 9506156625Bleed Valve · malfunctionedDURING TAKEOFF, THE NR 4 ENGINE EXPERIENCED EGT RISE AND POWER WAS REDUCED TO KEEP WITHIN LIMITS. DURING CLIMB THE FAULT LIGHT CAME ON INDICATING IN THE 8 TO 10 RANGE. THE NACELLE DETECTOR WAS SWITCHED TO 'B' AND THE BELL AND LIGHT CAME ON. THE ENGINE WAS SApr 18, 1995 · N625US · Boeing 747251B · Compressor Bleed ValveSDR 9506226613Floorbeam · corrodedDURING PERIODIC CHECK, THE MAIN DECK FLOORBEAM WAS FOUND CORRODED ON THE UPPER SURFACE OF UPPER CHORD AT FS 660, LBL 56. MAXIMUM DEPTH OF CORROSION AFTER BLEND-OUT WAS BEYOND 50 PERCENT OF FLANGE THICKNESS AT SEVERAL AREAS. FLOORBEAM UPPER CHORD IS MADE OF .Apr 13, 1995 · N613US · Boeing 747251B · Fuselage Main, Floor BeamSDR 9505466625Control Cable · disconnectedDURING TAKEOFF ROLL, THE NR 4 ENGINE WOULD NOT RESPOND TO POWER LEVER MOVEMENT AND THE TAKEOFF WAS ABORTED. THE CONTROL CABLE IN THE PYLON WAS FOUND TO HAVE DISCONNECTED AT THE PYLON DRUM. THE CABLE BOX IN THE PYLON WAS REPLACED AND THE SYSTEM OPERATION CHECApr 9, 1995 · N625US · Boeing 747251B · Power LeverSDR 9505916631Rib · damagedDURING PERIODIC CHECK, THE RIGHT WING LEADING EDGE RIB WAS DAMAGED WHILE INSTALLING THE NR 3 ENGINE STRUT. THE LOWER 'TEE' CHORD WAS BENT. CHORD MATERIAL 1507075-T6 EXTRUSION PER BAC 1505-10042. MADE REPAIR PER EA 66-97904.Apr 3, 1995 · N631US · Boeing 747251B · Wing, Attach FittingsSDR 9505896615Panel · corrodedDURING PERIODIC CHECK, FOUND THE LEFT WING LEADING EDGE UPPER WING FIBERGLASS PANEL CORRODED AT APPROXIMATELY ILES 338 AND GOING OUTBOARD APPROXIMATELY 24 INCHES OR TWO RIBS. INSTALLED NEW CHORD FROM BAC 1506-2664 EXTRUSION AND INSTALLED REPAIR.Apr 3, 1995 · N615US · Boeing 747251B · Wing, Plate/SkinSDR 9506146601Spar Web · crackedDURING PERIODIC CHECK, FOUND CRACK IN THE MID SPAR WEB OF THE NR 3 ENGINE STRUT STARTING AT A FASTENER NEXT TO THE INBOARD MID SPAR FITTING RUNNING FORWARD AND UNDER THE FITTING. MADE REPAIR PER EA 66-97901.Mar 27, 1995 · N631US · Boeing 747251B · Nacelle/Pylon StructureSDR 9505186615Stiffener · corrodedDURING PERIODIC CHECK, THE WING CENTER SECTION REAR SPAR VERTICAL STIFFENER AT LBL 86 WAS FOUND CORRODED. DISCREPANT STIFFENER P/N 65B10671-1 IS MADE FROM BAC 1517-1672 EXTRUSION AND MATERIAL IS 7178-T6511 ALUMINUM. MADE REPAIR PER EA 66-97876.Mar 27, 1995 · N632US · Boeing 747251B · Wing Miscellaneous StructureSDR 9505906615Frame · corrodedDURING PRIODIC CHECK, THE FRAME INNER CHORD WAS FOUND CORRODED ON THE FRAME AT FS 400, STR 26L. THE FRAME INNER CHORD P/N 65B07936-327 IS MADE FROM 7075 EXTRUSION PER BAC 1506-2031. MADE REPAIR PER EA 66-97919.Mar 24, 1995 · N615US · Boeing 747251B · Fuselage Main, FrameSDR 9505026631Chord · damagedDURING PERIODIC CHECK, THE MAIN DECK UPPER FLOOR BEAM WAS FOUND DAMAGED IN THE UPPER SURFACE OF UPPER CHORD FS 460, RBL 59. FLOOR BEAM IS MADE OF 2024-T3511 ALUMINUM. MADE REPAIR PER EA 66-97922.Mar 24, 1995 · N631US · Boeing 747251B · Fuselage Main, Floor BeamSDR 9505016615Stiffener · crackedDURING PERIODIC CHECK, THE LEFT WHEELWELL VERTICAL STIFFENER AT FS 1241 BULKHEAD WAS FOUND CRACKED. FABRICATED REPAIR AND INSTALLED.Mar 24, 1995 · N632US · Boeing 747251B · Fuselage Miscellaneous StructureSDR 9504846615Stringer · crackedDURING PERIODIC CHECK, FOUND CRACK EMANATING FROM STR 12L WEB BUT OUT IN FRAME 240L. STOP DRILLED CRACK TO .257 AND INSTALLED 2024-T3 .063 INCH DOUBLER PER SRM 51-40-02.Mar 24, 1995 · N632US · Boeing 747251B · Fuselage Main, Longeron/StringerSDR 9504826615Longeron · crackedDURING PERIODIC CHECK, FOUND SEVERAL CRACKS ON FUSELAGE INTERIOR STRINGER AT FS 1438, 1412, 1452, 1365, 1382.5, 1401.5, 1443, 1444, 1446, AND 1452.5. MADE REPAIRS PER SRM 51-10-01, PAR.0.Mar 24, 1995 · N632US · Boeing 747251B · Fuselage Main, Longeron/StringerSDR 9504496615Longeron · crackedDURING PERIODIC CHECK, FOUND A CRACK IN SECTION 41 LOWER LOBE. CRACK IS LOCATED AT STR 28R, FS 460. REMOVED DAMAGED FLANGE, FABRICATED REPAIR, AND INSTALLED.Mar 21, 1995 · N615US · Boeing 747251B · Fuselage Main, Longeron/StringerSDR 9504376614Oil Bypass Light · illuminatedDURING CRUISE, THE NR 3 ENGINE OIL FILTER BYPASS LIGHT ILLUMINATED. POWER WAS REDUCED TO FLIGHT IDLE AND THE LIGHT EXTINGUISHED. 2,000 LBS OF FUEL WAS DUMPED AND THE AIRCAFT DIVERTED TO ANC WHERE AN UNEVENTFUL LANDING WAS ACCOMPLISHED. NO CONTAMINATION WAS Mar 17, 1995 · N614US · Boeing 747251B · Engine Oil Indicating SystemSDR 9504366622Csd · failedDURING CRUISE, THE NR 2 ENGINE CSD OIL WARNING LIGHT ILLUMINATED FOLLOWED BY THE GENERATOR OFF AND FIELD OPEN LIGHTS. THE CSD WAS DISCONNECTED AND THE OIL TEMPERATURE CONTINUED TO RISE. THE ENGINE WAS SHUT DOWN, 35,000 LBS OF FUEL WAS DUMPED AND THE AIRCRAFTMar 16, 1995 · N622US · Boeing 747251B · Alternator-Generator Drive
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