Pratt & Whitney JT9D-7J

Service difficulty reports · 257

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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 engine_model_key = 'JT9D7J'
  ORDER BY difficulty_date DESC"

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SDR CA150612010Control Module · leaking(CAN) DURING WALK AROUND, MX CREWS FOUND EVIDENCE OF HYD LEAKING COMING FROM TAIL SECTION. AFTER FURTHER INVESTIGATION, THE HYD SYS 3 WAS COMING FROM UPPER RUDDER CONTROL MODULE, SMALL PIN HOLE, CRACK ON CASTING, SEE PICTURES. MX CREWS REPLACED THAT DEFECTIVJun 7, 2015 · Boeing 747SPJ6 · Rudder Control SystemSDR CA120808002Rod End · sheared(CAN) DURING WALK AROUND, MAINTENANCE CREW FOUND AN EVIDENCE OF HYDRAULIC LEAK COMING FROM RT INBD AILERON POWER CONTROL PACKAGE. FURTHER INVESTIGATION SHOWN THAT THE HYDRAULIC WAS COMING FROM THE ACTUATOR. MAINTENANCE CREW DECIDED TO REMOVED THE DEFECTIVE PAug 7, 2012 · Boeing 747SPJ6 · Aileron Control SystemSDR CA120606007Skin · damaged(CAN) DURING WALKAROUND INSPECTION, MAINTENANCE CREW FOUND AN EVIDENCE OF BIRD STRIKE ON L/E FLAP NR 21 NOSE FAIRING OTBD SECTION . THE NOSE FAIRING SECTION WAS INSPECTED IAW SRM 57-51-01 AND FOUND WITHIN LIMITS. NO NOISE, VIBRATIONS OR ENGINE FLUCTUATIONS WAJun 5, 2012 · Boeing 747SPB5 · Leading Edge DevicesSDR CA120126002Actuator · failed(CAN) WHILE CARRYING OUT THROTTLE RIGGING ON NR 3 ENGINE FOUND FUEL CONDITION CONTROL MOTOR ACTUATOR WITH ONE OF THE 3 ATTACH LUGS BROKEN. NO SYMPTOMS DURING AIRCRAFT OPERATION (GRD ENGINE RUNS OR FLIGHTS). CHECKED AND FOUND ONE SB TARGETTING THAT SPECIFIC SIJan 25, 2012 · Boeing 747SPJ6 · Fuel Control/Turbine EnginesSDR EIAA20111219259Engine · malfunctionedNR 4 ENGINE FIRE INDICATION. CREW REPORTED NR 4 ENGINE FIRE INDICATION AND BOTH FIRE BOTTLES DISCHARGED. PASSING THRU FL310 HEAD MUFFLED THUD FROM RIGHT SIDE, NO OTHER INDICATIONS. SHORTLY AFTER NR 4 ENGINE FIRE SWITCH ILLUMINATED 30 SECONDS LATER FIRE BELDec 19, 2011 · N486EV · Boeing 747212B · Engine (Turbine/Turboprop)SDR EIAA20111215261Pressure Switch · looseNR 3 OIL QUANTITY INDICATOR DROPPED TO ZERO AT 7000, OIL PRESSURE FLUCTUATED +/- 10 PSI. ENGINE SHUTDOWN. PERFORMED ENGINE WINDMILLING INSPECTION IAW MM 72-00-00 PAGE 846. FOUND LOW OIL PRESSURE SWITCH LOOSE, RETORQUED PER MM 79-33-01. OP'S AND LEAK CHECKED NDec 15, 2011 · N470EV · Boeing 747273C · Engine Oil Distribution (Airframe Furnished)SDR EIAA20111111250Fitting · leakingENGINE OIL PRESSURE LIGHT - SLOW LOSS OF OIL. FOUND EVIDENCE OF LEAKAGE AT THE ANGLE GEARBOX RIGHT SIDE FITTINGS, REPLACED WITH NEW SEAL PACKINGS PER MM 70-10-07 PERFORMED ENGINE WINDMILLING INSPECTION PER AMM 72-00-00. NO DEFECTS NOTED. SEAL REPLACED AT CNov 11, 2011 · N470EV · Boeing 747273C · Turbine Engine Oil SystemSDR EIAA2011222Engine · fireAPPROX 5 MINUTES AFTER DEPARTURE AND CLIMB POWER SET NR 3 ENG FIRE WARNING OCCURRED. ACCOMPLISHED ENG FIRE/SEVERE DAMAGE CHECKLIST. LIGHT REMAINED ILLUMINATED UNTIL AFTER LANDING. REMOVED AND REPLACED LT SIDE COWL DUE TO ALL DAMAGE PER MM71-11-06. PERFORMEDSep 7, 2011 · N485EV · Boeing 747212B · Engine (Turbine/Turboprop)SDR EIAA2011149Garlock Seal · leakingNR 4 ENGINE SHUT DOWN IN FLIGHT. FOUND CSD GARLOCK SEAL TO BE LEAKING. REMOVED CSD AND GENERATOR, INSTALLED DISPATCH KIT PER B747 MM 24-11-00. RAN NR 4 ENGINE FOR 30 MINUTES, NO OIL LOSS, QUANTITY STEADY PER MM 72-00-00, OK FOR CONTINUED SERVICE.Aug 22, 2011 · N471EV · Boeing 747273C · Turbine Engine Oil SystemSDR CA110715004Housing · fracturedDURING TAKEOFF ROTATION, THE NR 4 HYD PRESSURE CAUTION LIGHT CAME ON. FLIGHT ENGINEER REPORTED FLUID QTY WENT TO ZERO AFTER GEAR RETRACTION. TOWER REPORTED SMOKE FROM NR 4 ENGINE. UNEVENTFUL LANDING AFTER COMPLETING PROCEDURES AND CONFIGURING AIRPLANE FOR LJul 14, 2011 · Boeing 747SPJ6 · Hydraulic Pressure Relief Valve, MainSDR EIAA2011080Spinner · malfunctionedNR 2 ENGINE EXPERIENCED SURGE STALL WITH INSTANTANEOUS EGT EVENT AND SHUTDOWN, WITH VIOLENT VIBRATION PRIOR TO EVENT. CREW REPORTED VISIBLE DEBRIS IN AREA OF NR 2 INLET, DUMPED FUEL AND RETURNED TO HIK, NO FIRE REPORTED. FOUND NR 2 ENGINE SPINNER & FAN WITH Jul 6, 2011 · N470EV · Boeing 747273C · Turbine Engine Air Inlet SectionSDR EIAA2011039Compressor · surgesDURING CLIMB ENGINE NR 1 HAD ENGINE COMPRESSOR SURGE AT 12,000 19,000 AND AGAIN AT 29,000. OPERATED ENGINE AT IDLE NO FURTHER STALLS, NO EXCEEDENCE OBSERVED. RETURNED TO ANC. REMOVED AND REPLACED NR 1 ENGINE PER EIA W/C F7001, F7202, F7207, F7209 OP'S CHECKApr 25, 2011 · N486EV · Boeing 747212B · Turbine Engine Compressor SectionSDR CA110421005Support Beam · cracked(CAN) UPON LT NR 4 L/E FLAP PDU REMOVAL FOR ACCESS, FOUND PDU SUPPORT BEAM CRACKED. PART WAS REMOVED FOR REPAIR IAW SRM 51-40-03. AN INSPECTION WAS CALLED FOR ALL L/E FLAP PDU`S.Apr 15, 2011 · Boeing 747SPJ6 · Fuselage Miscellaneous StructureSDR CA110421002Channel · misinstalled(CAN) UPON REMOVAL OF LT WING L/E THROTTLE CABLE PULLEY BRACKET AT BS 445.5 FOR ACCESS, FOUND SUPPORT CHANNEL WRONGLY INSTALLED IAW IPC 76-11-44-02. AFT ATTACHMENT SAFETY BOLT, BACB30DX6-18 AND WASHER, BACW10P95A, MISSING. THE ASSY COULD HAVE DETACHED AND DIApr 15, 2011 · Boeing 747SPJ6 · Wing, Attach FittingsSDR EIAA2011020Line · looseNR 2 ENGINE SURGED PASSING FL140 EGT AT 750 EPR AT 1.3 HAD SURGE THEN HUNG, NO THROTTLE RESPONSE. SHUT DOWN ENGINE WAITED 5 MIN, THEN RE-STARTED, AFTER 10 MIN AT FL040, RE-TARDED THROTTLE AND EXPERIENCED 2ND SURGE SHUT DOWN ENGINE WITH NO EXCEEDANCE. CARRIEDMar 2, 2011 · N470EV · Boeing 747273C · Engine Indicating SystemSDR CA110212001Sleeve · looseWHILE REMOVING NR 2 ENGINE PYLON, FOUND A LT WING L/E FLAPS DRIVE SHAFT COUPLING SLEEVE, AT WSTA 468, WITH ATTACH SCREWS LOOSENING OUT DUE TO MISSING LOCKWIRE. AN INSP WAS INSTRUCTED TO BE CARRIED OUT ON BOTH OUR ACFT, ON ALL L/E FLAPS DRIVE SHAFTS COUPLINGS Feb 10, 2011 · Boeing 747SPJ6 · Trailing Edge FlapsSDR EIAA2010080Engine · malfunctionedAT 3500 FEET NR 2 ENGINE HAD AN EPR, N1, EGT ROLLBACK AND ENGINE SHUT DOWN WITH OIL PRESSURE DROP BETWEEN 30 AND 35 PSI. ACCOMPANIED BY SEVERE ENGINE VIBRATION, ALL SIMULTANEOUSLY. REMOVED AND REPLACED NR 2 ENG PER EIA 7201, 7203, 7204, 7207 & 7209 OPS CK GONov 27, 2010 · N482EV · Boeing 747212B · Engine (Turbine/Turboprop)SDR KCSA10052Control Box · unserviceableNR 2 ENGINE THRUST LEVER INOPERATIVE. ENGINE AT IDLE FOR 5 MINUTES. ALL PARAMETERS NORMAL. PERFORMED INFLIGHT ENGINE SHUTDOWN. TIME OF SHUTDOWN: 0029Z; OIL PRESSURE: 11 PSI/QUANTITY 5.7 GAL. REMOVED AND REPLACED CABLE DRUM PUSH/PULL CONTROL BOX IAW B747Nov 8, 2010 · N713CK · Boeing 7472B4B · Power LeverSDR CA101105001Duct · blown(CAN) AT ROTATION, EXPERIENCED NOTICEABLE VIBRATION FROM THE THROTTLE QUADRANT ACCOMPANIED BY NOISE. UPON RAISING THE GEAR, LEADING EDGE ANNUNCIATOR FLICKERING AMBER/GREEN. THE FE REPORTS WING OVERHEAT AND ALSO NOTES LOW DUCT PRESSURE. S.I.C AND F.E BEGIN THOct 22, 2010 · Boeing 747SPJ6 · Pneumatic Distribution SystemSDR CA100521003Stand Off · brokenCARRYING A ROUTINE LEAK TEST ON NR 1 AUX PITOT SYSTEM. FOUND SYSTEM LEAKING. DISCOVERED THE NR 1 AUX PITOT PRESSURE TUBE (3/8IN) AT BS 1301, WORN OPENED. THE TUBE IS ATTACHED TO THE STRINGER WITH A CLAMP ON A STAND-OFF, THE STAND-OFF WAS FOUND BROKEN AND THMay 18, 2010 · Boeing 747SPJ6 · Fuselage Main, Attach FittingsSDR EIAA200900136Oil System · leakingINFLIGHT SHUTDOWN OF ENGINE NR 1 FOR OIL LOSS. SERVICE ENG OIL, RAN AND INSPECTED ENG NR 1. FOUND OIL BEING BLOWN OUT OF RT 3.5 AND LT 3.5 UPPER BLEED VALVES. REPLACED NR 1 ENG EVC AND FILTER PER MM 75-31-09, 75-31-01. OPS CHECK NORMAL.Dec 18, 2009 · N482EV · Boeing 747212B · Turbine Engine Oil SystemSDR EIAA200900132Engine · malfunctionedNR 3 ENGINE SURGE/STALL AT MAX TAKEOFF POWER. EGT EXCEEDANCE 1088 DEG CELSIUS. REMOVED AND REPLACED NR 3 ENGINE PER WORKCARDS F7201, F7204, F7207, F7209. OPS & LEAK CHECK GOOD.Nov 27, 2009 · N470EV · Boeing 747273C · Engine (Turbine/Turboprop)SDR 2008F00022Fire Warning · activatedRECEIVED T FIRE WARNING ON CLIMBOUT AT 3500 FT ON NR 3 ENG. FILTER BYPASS LIGHT CAME ON, OIL PRESS WENT TO '0', OIL QTY WENT TO '0', OIL TEMP 160, N1, N2 NORMAL. FIRE HANDLE PULLED, BOTTLES WOULD NOT DISCHARGE (BOTH) HELD OVER 1 MIN.Oct 12, 2008 · N710CK · Boeing 7472B4B · Fire DetectionSDR KCSA08068Fire Suppression · malfunctionedRECEIVED FIRE WARNING ON CLIMBOUT AT 3500 FT ON NR 3 ENG FILTER BYPASS LIGHT CAME ON. OIL PRESS WENT TO "0", OIL QTY WENT TO "0", OIL TEMP 160, N1, N2 NORMAL. FIRE HANDLE PULLED, BOTTLES WOULD NOT DISCHARGE (BOTH) HELD OVER 1 MIN.Oct 12, 2008 · N710CK · Boeing 7472B4B · Fire DetectionSDR EIA2008055Engine · making metalDURING CRUISE ENCOUNTERED HEAVY SURGE NR 2 ENG ALONG WITH VIBRATION EPR DROPPED TO BOTTOM OF SCALE EGT REACHED YELLOW BAND, REDUCED POWER TO IDLE, VIBRATION PERSISTED, SHUT NR 2 ENGINE DOWN ENG WINDMILL OIL PRESS AT 28PSI. ANGLE GEARBOX AND MAIN GEARBOX CHIP Sep 29, 2008 · N485EV · Boeing 747212B · Engine (Turbine/Turboprop)SDR EIA2008042Engine · malfunctionedIN FLIGHT SHUT DOWN NR 2 ENGINE. C CRUISE RAIN, FL 4.0 WITH MODERATE TURB. NO THROTTLE MOVEMENT AND NOTED COMPRESSOR STALL.Aug 28, 2008 · N485EV · Boeing 747212B · Engine (Turbine/Turboprop)SDR EIA2008041Skin · damagedFUSELAGE AT BS 460-480 TOP BL O TO 5-IL, ANTENNA LOCATION SURFACE SKIN SUNK. REPAIRED PER SRM 51-30-02.Aug 28, 2008 · N485EV · Boeing 747212B · Fuselage Main, Plate/SkinSDR EIA2008040Sign · defectiveEXIT SIGN OVER CREW STAIR FOUND BELOW 100 M/L. REPLACED PER AMM 20-51-01.Aug 28, 2008 · N485EV · Boeing 747212B · Emergency LightingSDR EIA2008039Skin · crackedFUSELAGE BOTTOM SKIN AT BS 2061 5-45R CRACKED APPROX 2 INCHES. REPAIRED PER SRM 53-30-03 FIG 1.Aug 28, 2008 · N485EV · Boeing 747212B · Fuselage Main, Plate/SkinSDR EIA2008038Stringer · crackedSTATION 750 TO 760 STRINGER R-23 CRACKED. SPLICED AND REPAIRED PER 51-30-02.Aug 28, 2008 · N485EV · Boeing 747212B · Fuselage Main, Longeron/StringerSDR EIA2008037Floor Support · crackedMAIN DECK STATION 940 RBL 120 FLOOR PANEL SUPPORT CRACK. FABRICATED AND REPLACED IAW SRM 51-30-02.Aug 28, 2008 · N485EV · Boeing 747212B · Fuselage Miscellaneous StructureSDR EIA2008036Skin · crackedFUSELAGE BS 740 TOP AFT OF VHF BL 0 SURFACE SKIN CRACKED. REPAIRED PER SRM 53-30-03 FIG 48.Aug 28, 2008 · N485EV · Boeing 747212B · Fuselage Main, Plate/SkinSDR EIA2008034Light · inoperativeDURING EMG LT OPS TEST, FOUND V/D AFT CEILING EMERG. LT. INOP. REPLACED PER MM 33-51-00.Aug 28, 2008 · N485EV · Boeing 747212B · Emergency LightingSDR EIA2008033Structure · crackedRT WING L/E DEVICE FAIRING AFT WEB ADJACENT UPPER CHORD AND LOWER CHORD CRACK AT 1 LES 1127. REPLACED PER SRM 57-20-03.Aug 28, 2008 · N485EV · Boeing 747212B · Wing Miscellaneous StructureSDR EIA2008035Angle · crackedNR 1 PYLON AT A7 NAL STATION 22/LOWER SURFACE OF MID SPAR WEB LT 1 EA ANGLE CRACKED. FAB NEW ANGLE PER DRW 65B90387. HEAT TREAT AND NDT. INSTALLED PER SRM 51-30-02.Aug 28, 2008 · N485EV · Boeing 747212B · Nacelle/Pylon Miscellaneous StructureSDR EIA2008032Frame · crackedPYLON NR 4 AFT ENG MOUNT, RT (1/B) AFT FRAME, 1 HOLE CRACKED PER NDT REPORT. MFGR NEW FRAME PER DRW NR 65B90310 INSTALLED PER 51-30-02 - 51-24-11 - BAL5119.Aug 28, 2008 · N485EV · Boeing 747212B · Nacelle/Pylon, Frame/Spar/RibSDR EIA2008030Structure · crackedLTW L/E DEVICE FAIRING AFT WEB ADJACENT LOWER CHORD AND UPPER CHORD. CRACK AT ILES 1127. REPAIRED PER 51-40-04 AND 57-20-03 SRMAug 28, 2008 · N485EV · Boeing 747212B · Wing Miscellaneous StructureSDR KCS2008F00006Fire Loop · malfunctionedFIRE FAULT INDICATED ON P2 PANEL AFTER FLAPS UP. B-LOOP INDICATION ON NR 4 ENG TEMP OFF SCALE HIGH (NACELLE). FOLLOWED AOM PROCEDURE FOR ENG FIRE. VISUALLY CHECKED FOR INDICATION OF FIRE. NONE NOTED. NO RESTART ATTEMPTS. JETTISONED FUEL AND LANDED. (S)Jul 27, 2008 · N710CK · Boeing 7472B4B · Fire DetectionSDR KCSA08035Engine · flamed outNR 2 ENG SURGED DURING CONSTANT PWR, ENG WAS SHUT DOWN (FLAME OUT). EPR 1.1, ENG BLEED OPEN, ANTI-ICE - OFF, IGN SW - OFF, FLT MODE - CRUISE, ALT - 31,100 FT, .84 MACH, NO ICING, NO TURB.May 14, 2008 · N710CK · Boeing 7472B4B · Engine (Turbine/Turboprop)SDR EIA2007190Light · burned out"MAIN DECK FWD RT CEILING EMERGENCY LIGHT INOP. REPLACED EE LIGHT ASSY ZONE A AND B".Oct 29, 2007 · N485EV · Boeing 747200F · Emergency LightingSDR NWAA072866717Engine · flamed outDURING CRUISE, THE NR 3 ENGINE FLAMED OUT. APPROXIMATELY 60 SECONDS AFTER THE FLAME-OUT, THE NR 3 ENGINE FUEL ICING LIGHT ILLUMINATED. THE COM PROCEDURE WAS FOLLOWED AND THE ENGINE WAS RESTARTED AT FL380. THE FLIGHT CONTINUED TO NRT AND LANDED WITHOUT FURTHAug 16, 2007 · N617US · Boeing 747251F · Engine (Turbine/Turboprop)SDR EIA2007005Plug · leakingFLT 906, STATION PVG, "IN FIGHT SHUTDOWN OF NR 1 ENGINE, NO OIL QTY, OR PRESSURE." ON CLIMB-OUT THROUGH FL 310, F/E NOTED OIL QTY DECREASING AND PRESS FLUX CONTACTED DISPATCH AND WAS DIRECTED TO RETURN TO PVG FOR MX. MX FOUND "NR 1 ENGINE GEAR BOX CHIP DETECTJan 22, 2007 · N485EV · Boeing 747212B · Turbine Engine Oil SystemSDR KCSA06065Fuel Sys · leakingNR 2 ENG FUEL ICING LIGHT ILL OPERATED HEATER PER AOM. LIGHT STAYED ON. VISUALLY INSPECTED ENG. FOUND FUEL LEAKING. SHUT ENGINE DOWN. REPLACED FUEL PUMP PER JT9D MM 73-11-01. MOTOR & RUN TEST GOOD PER AMM 72-00-00.Jul 29, 2006 · N705CK · Boeing 747246F · Engine Fuel and ControlSDR EIA2006093Bleed Valve · failedNR 3 ENGINE NO BLEED SHIFT, THROTTLE LIMITED. REMOVED AND REPLACED 3.5 BLEED VALE, PRBC, AND FUEL CONVERTER, OPS CHECK GOOD IAW 75-32-01, 75-32-06 AND 71-00-00 TEST 9.Jul 10, 2006 · N471E · Boeing 747273C · Compressor Bleed ValveSDR WRNA200600011Fuel Control · malfunctionedAFTER TAKEOFF NR 4 ENGINE EGT STARTED FLUCTUATING AND STARTED TO CLIMB PAST 900 DEGREES, REDUCED POWER TO 1.29 EPR. AFTER POWER REDUCTION TEMPERATURE WAS STILL 850 DEGREES, EPR WAS LOWER (1.25) THAN OTHER J ENGINES. ACFT RETURNED TO MIA AND MADE A SAFE LANDIApr 25, 2006 · N524UP · Boeing 747200 · Fuel Control/Turbine EnginesSDR WRNA200600008Engine · shutdownPRECAUTIONARY SHUTDOWN NR 4 ENGINE DUE TO LOSS OF OIL PRESSURE, ALL OTHER INDICATIONS NORMAL. WINDMILLING OIL PRESSURE STAYED ABOVE 10 PSI. PERFORMED INLET & EXHAUST VISUAL INSPECTION, NO DEFECTS. PERFORMED WINDMILL INSPECTION PER MM 72-00-00 PG 682 W/X 3F Apr 2, 2006 · N524UP · Boeing 747200 · Engine Oil PressureSDR WRNA200600009Packing · damagedIN CRUISE OIL PRESSURE LIGHT FLASHING, EGT, N1, N2, OIL TEMP NORMAL OIL PRESSURE 40 PSI, OIL QTY. PERFORMED ENGINE FAILURE PRECAUTIONARY SHUTDOWN CHECKLIST. DIVERTED TO CLOSEST AIRPOR. ENGINE WINDMILLING FLT TIME 20 - 25 MINS, PART OF THAT TIME ENGINE OIL PApr 2, 2006 · N524UP · Boeing 747200 · Turbine Engine Oil SystemSDR WRNA200600007Engine · shutdownNUMBER 4 ENGINE COMPRESSOR STALL BELOW 60 KTS, SHUTDOWN ENGINE, EGT WENT TO 1090 FOR 3 SECONDS. PERFORMED BORESCOPE INSPECTION OF LPC, HPC, COMBUSTION CHAMBER ASSY, HPT AND LPT, IAW 72-00-00 PG 601, NO DEFECTS NOTED. PERFORMED OVER TEMPERATURE VISUAL INSPECTMar 31, 2006 · N524UP · Boeing 747200 · Engine (Turbine/Turboprop)SDR EIA200637Control Valve · out of adjustWHEN PACKS TURNED ON AFTER T/O, COCKPIT FILLED WITH ACIDIC, SWEET FUMES. ISOLATED PACKS AND BLEED AIR VALVES, WAS UNABLE TO ISOLATE SOURCE. RETURNED TO FIELD. FOUND ENGINE EVC OUT OF TRIM. TRIMMED PER 747MM 71-00-00 TEST 8, PG 580C GROUND RAN FOR 1.5 HOURSMar 21, 2006 · N485EV · Boeing 747212B · Compressor Bleed GovernorSDR 06012Engine · leakingNR 1 ENG LOST OIL QTY 1 GAL, 1/2 HR SHUT ENG DOWN AT 0930Z WITH 1.25GAL REMAINING. PERFORMED WINDMILLING ENG PROCEDURE AT 1000, 1030, 1050Z. WINDMILLING OP 19 PSI TEMP 50 DEGREE C 1000Z QTY .5 GAL QTY IND 0 GAL AT 1025Z OP 21 PSI TEMP 40 DEGREE. OP ONLY WENFeb 15, 2006 · N713CK · Boeing 7472B4B · Turbine Engine Oil System
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