JASC 7310

Service difficulty reports · 1,981

Reports filed under 7310 · Engine Fuel Distribution, newest first.

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 jasc_code = '7310'
  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 UIEA2020010900040Fuel Filter · faultedEICAS MSG "R ENG FUEL FILT". MSG BLANKED ASCENDING FL210. STATUS MSG "R ENG FUEL FILT" REMAINS.(<P>REMOVED AND REPLACED R ENG FUEL FILTER IAW AMM 73-11-02. PERFORMED LEAK CHECK. NO LEAKS NOTED. MSG EXTINGUISHED AND DID NOT RETURN DURING OPS CHECK. REF B767 AMMJan 8, 2020 · N1327A · Boeing 76737DSDR SWAA2019123140078Hmu · faultySUPPLEMENTAL INFORMATION, UPON SETTING TAKEOFF THRUST, NR 2 THRUST LEVER AT 89% N1, NR 1 THRUST LEVER GOT TO 84% N1 WITH THRUST LEVER MATCHED. PUSHED NR 1 THRUST LEVER UP TO APPROXIMATELY 86% N1, N1 DROPPED TO 83-84%, ABOVE 1000, NR 2 THRUST LEVER AT 94% N1, NDec 29, 2019 · N719SW · Boeing 7377H4SDR UIEA2019121216052Housing · damagedITEM 1: EICAS MSG RH ENG FUEL FILTER CLIMBING THROUGH 10,000, N1 106.4. CLEARED WHEN THRUST REDUCED FOR CRUISE. NO ENGINE ABNORMALITIES NOTED. ITEM 2: STATUS MSG RH ENG FUEL FILTER Dec 11, 2019 · N1361A · Boeing 76731BSDR DALA2019120507097Warning Message · false activationSHIP 3307-IFSD- WHILE ON APPROACH INTO BCN LEFT ENG FUEL LEAK MESSAGE WITH ENGINE ROLLBACK AND NO THROTTLE RESPONSE. FLIGHT CREW SHUT DOWN LEFT ENGINE. CORRECTIVE ACTION: MAINTENANCE INSPECTED INLET AND EXHAUST, NTF. C/W WITH WINDMILL INSPECTION, NTF. REVIEWEDDec 4, 2019 · N807NW · Airbus A330323SDR UIEA2019120295963Filter · warning messageRIGHT ENGINE FUEL FILTER STATUS/EICAS MESSAGE. (<P>REMOVED AND REPLACED RIGHT ENGINE FILTER REF AMM 73-11-02-004-001-H00, NO LEAKS NOTED. PERFORMED FUEL FILTER INSPECTION, NO DAMAGE FOUND IN REF 73-11-03-202-001-H00. PERFORMED ENGINE RUN, NO MESSAGES, ALL NORMNov 29, 2019 · N641GT · Boeing 76738ESDR UIEA2019111905930Warning Message · false activationDURING RIGHT ENGINE START, "R ENG FUEL VAL" EICAS MESSAGE DISPLAYED.(<P>COMPLIED WITH ENGINE RUN PER AMM 71-00-00, NO FURTHER DEFECTS NOTED AT THIS TIME. MCC NOTIFIED.</P>)Nov 19, 2019 · N1321A · Boeing 767306SDR ASAA2019102931188Servo · leakingFOUND SERVO FUEL HEATER LEAKING ON MAINTENANCE ENGINE RUN. GROUNDED - YES. REMOVED SERVO FUEL HEATER REF B737-800 AMM 73-11-07-000-801-F00. INSTALLED NEW FUEL HEATER SERVO REF AMM 73-11-07-400-801-F00 LK CK GOOD.Oct 29, 2019 · N533AS · Boeing 737890SDR UIEA2019102805800Fuel Filter · warning messageR ENGINE FUEL FILTER EICAS ON DEPARTURE.(<P>REMOVED AND REPLACED FUEL FILTER PER B767 AMM 73-11-02-004-001-H00 & 73-11-02-404-008-H00, NO LEAKS NOTED.</P>)Oct 27, 2019 · N1499A · Boeing 767328SDR ASAA2019100293874Shutoff Valve · out of limitsAFTER SHUTDOWN ENG 2 NORMALLY, ENG VALVE CLOSED ANNUNCIATOR REMAINED BRIGHT. ACFT GROUNDED. REPLACED NR 2 HMU HPSOV SWITCH REF B737-800 AMM 73-21-09-000-801-F00 & 73-21-09-400-801-F00. OP'S CHECK GOOD REF PP TEST #12 & #13 REF AMM 71-00-00-800-811-F00.Sep 28, 2019 · N518AS · Boeing 737890SDR AALA201909159019Fuel Filter · cloggedAIRCRAFT WAS GROUNDED: FLIGHT RETURNED TO DFW ON ACCOUNT OF RIGHT ENGINE FUEL BYPASS INDICATION. AN EMERGENCY WAS DECLARED. MAINTENANCE ACCOMPLISHED BITE CHECK IAW FIM 73-05-00. REMOVED & REPLACED RT FUEL FILTER IAW JOB CARD 73-94-13.Sep 14, 2019 · N931AN · Boeing 737823SDR ASAA2019082753509Valve · leakingNR 2 ENG FUEL LEAK, . FOUND BROKEN HPTCC VALVE DRAIN LINE AT "B" NUT CONNECTION. GROUNDED - YES. REMOVED AND REPLACED HPTACC VLV PER B737-900 AMM 75-21-01-000-801-F00 AND DRAIN MANIFOLD ABUTMENT LINE AMM 20-00-00. PERFORMED NECESSARY TESTS UNDER PROCEDURE AMM Aug 25, 2019 · N435AS · Boeing 737990ERSDR AALA2019082109031Packing · cutAIRCRAFT WAS GROUNDED: FLIGHT RETURNED TO DFW ON ACCOUNT OF LEFT ENGINE FUEL LEAK. EMERGENCY WAS DECLARED. MAINTENANCE FOUND LOWER FP PUMP TO FFG LINE PACKING CUT. REMOVED AND REPLACED IAW AMM 73-11-06-004-015-R00. LEAK CHECK GOOD AT TAKEOFF TEST #2. OK FOR SEAug 19, 2019 · N189AN · Boeing 757223SDR UIEA2019081205005Fuel Filter · cloggedAFTER TAKEOFF, R ENG FUEL FILT EICAS AND STATUS MESSAGE. REMOVED AND REPLACED THE FUEL FILTER ELEMENT REF AMM 73-11-03-404-001-H00. NO LEAKS NOTED.Aug 11, 2019 · N662GT · Boeing 76731ASDR ASAA2019080930373Pressure Switch · failedDURING INITIAL LEVEL OFF AT FL340 "#1 FILTER BYPASS" ILLUMINATED. RAN QRH PROCEDURE. QRH ALLOWED TO CONTINUE AS #1 ENG SHOWED NORMAL INDICATIONS. GROUNDED - YES. CONFIRMED PART # AND EFFECTIVTY REMOVE AND REPLACE #1 ENG FUEL FILTER DIFFERENTIAL PRESS SWITCH PEAug 9, 2019 · N532AS · Boeing 737890SDR CA190808012Transmitter · leaking(CAN) FLIGHT SNAG - FLIGHT CREW REPORTED SIGNIFICANT FUEL LEAK COMING FROM #2 ENGINE. #2 ENGINE FUEL FLOW TRANSMITTER FOUND LEAKING FROM AROUND CANNON PLUG MATING SURFACE ON HOUSEING OF TRANSMITTER. SEE ATTACHED PICTURE WITH ARROW INDICATING REPORTED POINT OF Aug 8, 2019 · Aerosp ATR72202SDR AALA2019080879013Pressure Switch · unreliableAIRCRAFT WAS GROUNDED: PILOT REPORTS LEFT FUEL FILTER BYPASS ILLUMINATED, NO ERRATIC SIGNS INDICATION. FIGHT CONTINUE PER QRH. MAINTENANCE REMOVED AND REPLACED FUEL FILTER DIFFERENTIAL PRESSURE SWITCH AND ENGINE FUEL FILTER IAW FIM 73-05-00-810-801.F00. LEAK CAug 6, 2019 · N910NN · Boeing 737823SDR DALA2019080504585Housing · looseTHE CREW DIVERTED THE FLIGHT DUE TO THE AIRCRAFT DEVELOPING A FUEL LEAK WHILE ENROUTE. MAINTENANCE FOUND THE FUEL FILTER HOUSING COVER ATTACHMENT LOOSE DUE TO A MIGRATED INSERT. THE FUEL FILTER HOUSING WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE.Aug 3, 2019 · N989AT · Boeing 717200SDR COEA2019080669923Pump · fodTWO INCH POWER LEVER SPLIT, RT POWER LEVER FORWARD. MAINTENANCE REPLACED THE RT FUEL PUMP AND FUEL CONTROL UNIT. ON FURTHER INVESTIGATION, DISCOVERED FOD IN THE FUEL INLET PORT, CHAFING ON INTERNAL TUBE. OPS CHECKED GOOD.Jul 26, 2019 · N923FX · Aerosp ATR42300SDR UIEA2019072204821Fuel Filter · faultedITEM 1 - L ENG FUEL FILTER EICAS MESSAGE AFTER TAKE OFF. ITEM 2 - STATUS MESSAGE, L ENG FUEL FILTER. (<P>REMOVED AND REPLACED LEFT ENGINE FUEL FILTER IAW AMM 73-11-02, LEAK CHECK GOOD. </P>)Jul 22, 2019 · N1489A · Boeing 76731KSDR O9IA2019070900001Fdu · failedON JULY 4TH, 2019 AT APPROXIMATELY 1545Z, THE RIGHT ENGINE FAILED AND SHUT DOWN WITH NO EXPLANATION DURING HIGH ALTITUDE DESCENT ON THE CHINS3 ARRIVAL INTO BFI. I WAS DESCENDING FROM FL430 TO FL240, AROUND SUNED INTERSECTION, IN VMC CONDITIONS, SMOOTH AIR, ANDJul 4, 2019 · N149WW · Cessna 525BSDR AALA2019062099009Fuel Filter · restrictedAIRCRAFT WAS GROUNDED: PILOT REPORTS ON DECENT @ FL180 FLT IDLE N1 35.2% ENG 1/ ENG 2 48.7% FF 720 LBS / FF 1360 LBS AT @ 10000 FEET AT IDLE N1 29.6/840 LBS / 42.2%1440 LBS H. MAINTENANCE REPLACED RH ENGINE FUEL FILTER IAW AMM 73-12-42. ENGINE OPERATION NORMAJun 18, 2019 · N560UW · Airbus A321231SDR CA190529011Tube · separated(CAN) HELICOPTER FAILED TO START, FUEL SMELL DETECTED. INVESTIGATION LED TO FUEL LEAK AT START ELECTRO-VALVE PIPE. FLARE FOUND SEPARATED FROM TUBE, TUBE REPLACED WITH SERVICEABLE, LEAK CHECKED, GROUND RUN, NO FURTHER DEFECTS FOUND. TUBE CONTAINS FUEL ONLY AT May 28, 2019 · Snias AS350B2SDR AALA201905299001Fuel · contaminatedAIRCRAFT WAS GROUNDED: PILOT REPORTS POSSIBLE UNCOMMANDED FUEL TRANSFER FROM RIGHT MAIN TANK TO CENTER TANK OF 500LBS DURING INITIAL CLIMB WITH FUEL IN ALL 3 TANKS AND ALL FUEL PUMPS ON FUEL DECREASED 500 LBS ON RT MAIN TANK INDICATION. A COMPARISON OF FUEL USMay 28, 2019 · N829NN · Boeing 737823SDR CA190524018Transfer Tube · cracked(CAN) DURING ACCOMPLISHMENT OF SCHEDULED MAINTENANCE TASK DH4-73-21-06-RR-802-LM (REPLACEMENT OF THE FMU TRANSFER TUBES) AN AME NOTED THAT THE FUEL TRANSFER TUBE BRACKET ON THE LEFT ENGINE WAS CRACKED. THE ASSEMBLY WAS REPLACED WITH SERVICEABLE AND THE AIRCRAFMay 24, 2019 · Bombdr DHC8400SDR 2019FA0000157Gasket · crackedENGINE FUEL INLET SCREEN GASKETS SPLITTING, CAUSING A FUEL LEAK. WE BELIEVE THIS TO HAVE BEEN A BAD BATCH OF GASKETS. ON THIS PARTICULAR AIRPLANE, NEW GASKETS WERE INSTALLED ON 4/2. PILOT REPORTED TO US THAT THE LEFT GASKET WAS LEAKING ON 4/26. RIGHT SIDE WAS May 23, 2019 · N592WT · Beech 58SDR UIEA2019052204273Fitting · looseON WALK AROUND, DISCOVERED FUEL LEAKING AND POOLING REAR UNDERSIDE OF LT ENG. (<P>OPENED LT ENGINE PURGE LINE GOING TO FUEL CONTROL, T FITTING LOOSE. TIGHTENED T FITTING, RAN ENGINE PER AMM 71-00-00 AND AMM 70-50-00, NO LEAKS FOUND. AIRCRAFT OK FOR SERVICE.</PMay 22, 2019 · N640GT · Boeing 7673S1SDR CA190507003Pressure Switch · malfunctioned(CAN) BA SER CASE: 44593 ` AS PER TC AND BA AGREEMENT, A SDR MUST BE CREATED FOR EACH ETOPS EVENT` SER - ETOPS- L FUEL EJECTOR FAIL DURING TAKE-OFF L ENG FUEL LO PRESS CAUTION + L FUEL EJECTOR FAIL ADVISORY MESSAGES DURING TAKE-OFF AT ABOUT 60 KTS REJECTEDMay 6, 2019 · Airbus BD5001A11SDR CA190430024Hose · leaking(CAN) DURING A-CHECK OF CONVAIR, RH QEC FUEL LINE FROM FUEL FILTER/PUMP ASSY TO FCU IINLET LEAKING FOUND AT FUEL PUMP/FILTER SIDE. HOSE REPLACED. GROUND FUNCTION CHECKED SERVICEABLE. (TC# 20190430024)Apr 26, 2019 · Cvac 340CVACSDR ASAA2019042639142Filter · abnormal#2 FUEL FILTER BYPASS LIGHT ILLUMINATED AFTER ENGINE START. GROUNDED - YES. REMOVED AND REPLACED #2 ENG FUEL FILTER, DRAIN PLUG O-RING, AND RE-SAFETIED DRAIN PLUG IAW B737-800 AMM 73-11-02. ACCOMPLISHED GROUND VERIFICATION, PERFORMED IDLE ENG RUN OF #2 ENG, NOApr 23, 2019 · N513AS · Boeing 737890SDR CA190418009Tube · damaged(CAN) AIRCRAFT TOOK OFF AT 11:54 UTC 16/APR/2019. A FEW MINUTES INTO THE FLIGHT IT WAS DISCOVERED THAT THE #2 ENGINE HAD AN EXCESSIVE FUEL FLOW AND FUEL COULD BE SEEN COMING OUT OF THE #2 ENGINE DRAIN MANIFOLD. THE AIRCRAFT STARTED TO RETURN TO AND ON THE DESCApr 16, 2019 · Aerosp ATR72202SDR 2LCF2019041750001Pressure Switch · defectiveAFTER TAKEOFF INDICATE MESSAGE ON THE EICAS FOR RH ENGINE FUEL FILTER, THE CREW CARRIED OUT THE PROCEDURES IN THE CABIN TO BE ABLE TO RETURN TO DEPARTURE. ONCE THE AIRCRAFT WAS FOUND ON THE PLATFORM, IT WAS MOVED TO THE HANGAR AND WORKSHOP MADE TESTS TO CONFIApr 15, 2019 · N538LA · Boeing 767316SDR ASAA2019041098949Pressure Switch · failedRIGHT ENGINE FUEL FILTER LIGHT ILLUMINATED. GROUNDED - YES. DIVERSION TIME 18 MINUTES - REF B737-900 FIM 73-05 TASK 801. REMOVED AND REPLACED FUEL FILTER PRESSURIZATION DIFFERENTIAL SWITCH REF B737-900 AMM 73-34-01-000-801/73-34-01-400-801. PERFORMED INSTALLATApr 9, 2019 · N428AS · Boeing 737990ERSDR ASAA2019040848927Valve · failedENGINE 1 FUEL RETURN VALVE. VALVE NOT CLOSED. GROUNDED - YES. PERFORMED ACTUATORS TEST PER AMM 73-29-00-740-802-A. TEST OK. NO FAULTS NOTED AT THE TIME OF THE TEST.Apr 4, 2019 · N928VA · Airbus A321253NSDR CA190416001Strainer · malfunctioned(CAN) DURING TAKEOFF ROLL, AFTER SETTING TAKEOFF POWER REACHED UP TO 60% ONLY THE TAKE0FF WAS REJECTED BELOW 80 KNOTS. DURING TROUBLESHOOTING, THE STRAINER AND FUEL FLOW DIVIDER VALVE WERE REPLACED AND THE AIRCRAFT RETURNED TO SERVICE AFTER GROUND RUNS CHECKS.Apr 3, 2019 · Bombdr DHC8400SDR CA190422010Flow Divider · malfunctioned(CAN) PILOT REPORT: REJECTED TAKE OFF DUE TO ENGINE 1 TORQUE LOW ACTION IS TO PERFORM THE FOLLOWING 1. INSPECT THE FUEL FILTER FOR CONTAMINATION 2. PERFORM REPLACEMENT OF FDV 3. PERFORM REPLACEMENT OF FMU SUBJECT TO SPARES REACHING THE STATION 4. POWER ASApr 3, 2019 · Bombdr DHC8400SDR ASAA201904018833Servo · leaking#1 ENGINE FUEL SERVO FOUND LEAKING DURING IDLE ENG RUN. GROUNDED - YES. REPLACED #1 ENG SERVO FUEL HEATER REF B737-800 AMM 73-11-07-000/400-801-F00. INSTALLATION TEST GOOD. LEAK CHECK GOOD.Mar 30, 2019 · N587AS · Boeing 737890SDR QMLA2019032619031Tube · crackedSTRONG FUEL SMELL IN AIRCRAFT IN FLIGHT. DURING TROUBLE SHOOTING DISCOVERED A CRACKED FCU RETURN FUEL TUBE BELOW THE NR 1 ENGINE DECK.Mar 26, 2019 · N659AM · Agusta A109ESDR CA190327009Transmitter · leaking(CAN) JUST PRIOR TO STARTING #1 ENGINE, FUEL WAS NOTICED ON GROUND BELOW. MTCE INVESTIGATED AND FOUND THE #1 FUEL FLOW TRANSMITTER LEAKING. FUEL FLOW TRANSMITTER REPLACED IAW JIC 73-31-61 RAI 10000. (TC# 20190327009)Mar 25, 2019 · Aerosp ATR42500SDR 2019FA0000118Fuel Line · crackedDURING NORMAL CRUISE FLIGHT PILOT REPORTED ROUGH RUNNING ENGINE AND ASSUMED A SPARK PLUG HAD FAILED. MAINTENANCE INSPECTION DETERMINED THE NR 1 ENGINE CYLINDER, FUEL INJECTOR NOZZLE FAILED. THE INJECTOR LINE FAILED AT THE BRAZED PORTION CLOSEST TO THE FUEL NOZMar 22, 2019 · N1419D · Cessna 172SSDR CA190313001Fuel Filter · bypassing(CAN) IN FLIGHT, THE FLIGHT CREW RECEIVED #2 FUEL FILTER BYPASS WARNING LIGHT. THIS RESULTED IN AN AIRBORNE RETURN TO ORIGINATING POINT. REPLACED THE #2 ENGINE FUEL FILTER IAW AMM 73-10-00-02 & TIB DH8-73-06. AIR/LEAK & VISUAL CHECK OF FILTER INSTALLATION COMMar 12, 2019 · Dhav DHC8301SDR HALA2019031300122Fuel Line · chafedETOPS SIGNIFICANT SYSTEM - NR 1 ENGINE FUEL LINE FROM HEAT EX-CHANGER CHAFED THRU, LEAKING. REMOVED AND REPLACED FUEL LINE AT HEAT EX-CHANGER IAW AMM 73-11. IDLE RUN LEAK CHECK GOOD.Mar 12, 2019 · N375HA · Airbus A330243SDR F3LA2019031200024Fuel Line · blew outDISCREPANCY: REFERENCE LP1178843 ITEM 3, NR 2 ENGINE LEAKING FUEL AFTER OUR ALLOWABLE 5 MINUTES DURING ENGINE START. CORRECTIVE ACTION: REMOVED AND REPLACED FUEL TUBE BETWEEN FUEL PUMP AND MAIN HEAT EXCHANGE REF AMM 73-11-05 PB401 AND AMM 73-11-20 PB401 ANMar 10, 2019 · N309FR · Airbus A320251NSDR CA190301007Line · cracked(CAN) AIRCRAFT START WAS ATTEMPTED AND ABORTED DUE TO THE ENGINE HANGING DURING START. UPON INVESTIGATION BY AN ENGINEER IT WAS DISCOVERED THAT THE LEFT HAND START INJECTOR LINE WAS LEAKING AT THE BACK OF THE `B` NUT. ONCE REMOVED A CRACK WAS FOUND IN THE LINEFeb 24, 2019 · Snias AS350BASDR UIEA2019022103293Filter · warning messageEICAS CAUTION "L ENG FUEL FILT" ON CLIMB @ FL180 MESSAGE + STATUS MSG CLEARED @ FL230 WITHOUT CREW CORRECTIVE ACTION.(<P>REMOVED AND INSTALLED SERVICEABLE L/H ENG FUEL FILTER IAW B767 AMM 73-11-03-404-009-H00. PERFORM L/H ENG RUN B767 TAXI + RUN UP CHECKLIST LFeb 20, 2019 · N1381A · Boeing 767316SDR CA190220015Line · damaged(CAN) L/H ENGINE FUEL LEAK PIPE BETWEEN FUEL/OIL HEAT EXCHANGER BYPASS VALVE AND FUEL/OIL MANIFOLD ASSEMBLY CRACKED AT SOLDERING POINT REPLACED PIPE BETWEEN FUEL/OIL HEAT EXCHANGER BYPASS VALVE AND FUEL/OIL MANIFOLD ASSEMBLY WO3, WO4 AND L/H ENGINE IGNITIONFeb 17, 2019 · Airbus BD5001A11SDR UIEA2019021983248Fuel Filter · warning messageR ENG FUEL FILT EICAS MSSAGE ON ALL CLIMB SEGMENTS(<P><SPAN>R/R / R/H ENGINE FUEL FILTER IAW AMM 73-11-02. OPS NORMAL LEAK CHECK GOOD.</SPAN></P>)Feb 16, 2019 · N645GT · Boeing 767324SDR HALA2019021540955Filter · cloggedDIVERTED DUE TO THE NBR 1 ENGINE FUEL FILTER CLOG MESSAGE, AND ENG EPR MODE RECOVERABLE MESSAGE. CORRECTIVE ACTION: REPLACED NBR 1 ENGINE LP FUEL FILTER (4088327), OPU, PCU, AND ECC (4088328). LP 4088327, 4088328.Feb 14, 2019 · N384HA · Airbus A330243SDR UIEA2019021543218Fuel Filter · warning messageDURING CLIMB POWER EICAS MSG "L ENG FUEL FILTER" DISPLAYED (<P>ACCOMPLISHED FIM 73-11 F/T 804 BLOCKS 1 AND 21. REMOVED AND REPLACED LH ENG FUEL FILTER I.A.W. AMM 73-11-02, FILTER CONTAMINANTS NOT FOUND. PERFORMED GROUND ENG RUN I.A.W AMM 71-00-00, NO LEAKS NOTFeb 13, 2019 · N767MW · Boeing 767277SDR RAIA201908070001Filter · obstructedE1-E2 FUEL IMEND BYPASS SHORTLY AFTER T/O. FOUND DEBRIS IN BOTH ENGINE FUEL FILTERS. R&R BOTH FILTERS. SUMPED DEBRIS AND WATER FROM ALL TANKS MULTIPLE TIMES. NO MORE DEBRIS NOTED DURING SUMPING. PERFORMED ENGINE RUNS. FUEL BYPASS PINS DID NOT POP. REMOVED, CFeb 7, 2019 · N12126 · Emb EMB145XRSDR ASAA2019013128161Fuel Line · failedON CLIMBOUT AT = FL215 THE AIRPLANE EXPERIENCE A MODERATE JOLT SIMILAR TO AN ENGINE STALL / SURGE. THE NR 1 N1 DROPPED FROM = 88% TO 79% W/ASSOCIATED DROP IN EGT. SOON AFTER NR 1 STABILIZED WITH NR 2 AT = 81%. IT WAS AT THIS POINT THE "IMBAL" ALERT WAS ILLUMINJan 31, 2019 · N323AS · Boeing 737990
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