JASC 3610

Service difficulty reports · 7,150

Reports filed under 3610 · Pneumatic Distribution System, 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 = '3610'
  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 QXEA2022080100262Bleed Air Sys · abnormal#1 BLEED HOT CAME ON AT 40KTS. ABORTED TAKEOFF. CONTACTED MAINTENANCE. NO ABNORMAL BRAKING USED. REMOVED FROM SERVICE. PERFORMED RESET PER SPGRG 36-01-01 MESSAGE CLEARED. THIS ACTION PERFORMED PER GPM 8.2.2.4 M/C 40024. NO PARTS REPLACED. AIRCRAFT RETURNED TOJul 29, 2022 · N445QX · Bombdr DHC8402SDR I5PA2022072692203Shutoff Valve · faultyTHE RIGHT ENG BLEED SHUT OFF WITH THE USE OF THE COWL ANTI ICE SYSTEM. THE LEFT ENG BLEED WAS UTILIZED FOR THE RIGHT SYSTEM PER THE QRH CAUSING THE LEFT ENG BLEED TO SHUT OFF. CABIN PRESSURE WAS LOST AND THE CREW DIVERTED TO BNA. THE RIGHT ENG HPSOV WAS FOUND Jul 26, 2022 · N922TS · Boeing 757260PFSDR UIEA2022072700787Sensor · low pressureAFTER TAKEOFF, BOTH DUCTS INDICATED BETWEEN 6 AND 7 PSI (REPLACED FAN AIR TEMP SENSOR PER AMM 36-12-02 AND FAN AIR VALVE PER AMM 36-12-04 ON NUMBER 3 ENGINE. ALSO REPLACED #3 PRESSURE REGULATING AND SHUT OFF VALVE PER AMM 36-11-04. ALL TEST GOOD</P>)Jul 26, 2022 · N471MC · Boeing 747412SDR UIEA2022072600772Isolation Valve · faultyAFTER TAKEOFF, BOTH DUCTS INDICATED BETWEEN 7 AND 17 PSI(PERFORMED FIM TASK 36-11 TASK 826. FOUND RIGHT ISOLATION VALVE FAULTY. REMOVED AND REPLACED RIGHT ISOLATION VALVE IAW AMM 36-11-07-404 AND PERFORMED LEAK CHECK. OPS CHECK & LEAK CHECK GOOD.</P>)Jul 25, 2022 · N471MC · Boeing 747412SDR SWAA2022072733107Valve · leaking#2 ENG REACHED 922 ON CLIMB PILOTS REDUCED THRUST TO 900EGT WITHOUT AUTOTHROTTLES TO CRZ #2 FF WAS CONSISTENTLY HIGHER LEADING TO FUEL IMBALANCE #2 EGT WAS CONSISTENTLY HIGHER THAN #1 ENG BY 60*C. / [01] PERFORM EEC BITE TEST PER AMM 73-21-00; NO FAULTS FOUND.Jul 23, 2022 · N7731A · Boeing 73776NSDR ASAA2022072239193Valve · unserviceableWHILE ACOMPLISHING ASA TASK CARD NG-36WC-00002-2 FOUND PRECOOLER VALVE ON ENG #2 TO BE UNSERVICEABLE. GROUNDED - YES. REMOVED PRECOOLER CONTROL VALVE REF B737-900 AMM 36-12-02-000-801. REPLACED PRECOOLER CONTROL VALVE REF AMM 36-12-02. OPS CHECK COMPLETED.Jul 22, 2022 · N459AS · Boeing 737990ERSDR ASAA2022072139154Modulating Valve · faultyOVERHEAD MAINT LIGHT ILLUMINATED ON LANDING ROLLOUT. GROUNDED - YES. STATUS MESSAGE PRESENT "BLEED FAMV R" FAULT CODE 361 12542 MAINT MESSAGE 36-12021 LATCHED. REMOVED #2 ENG FAMV REF B737-9 AMM 36-12-03-000-801 INSTALLELD R FAMV OPS TEST GOOD, GROUND VERIFICAJul 21, 2022 · N928AK · Boeing 7379SDR SIMA20220721003Bleed Air Sys · leakingBLEED 2 LEAK MESSAGE DURING CLIMBOUT QRH RAN AND CLEARED LOST BOTH BLEEDS. EMERGENCY DECLARED.DIVR TO BNA NOT OVERWEIGHT -C/A-T/S FAULT CODE 36113001AM1 PER FIM TASK 36-11-00-810-837-A PERFORMED GVI OF BLED LINES NO DEFECTS NOTED PERFORMED BLEED ODS NVM RESET Jul 21, 2022 · N230NN · Emb ERJ170200LRSDR NACA2022072000001Eicas · fault messageL ENG PRV EICAS MESSAGE ON ENGINE START IN GATES @ MIA. REMOVED AND REPLACED LEFT ENGINE PRV IAW B767 AMM 36-11-18, AWAITING OPS CHECK AND LEAK CHECK SEE ITEM M-2 (GOOD). ETOPS GROUND VERIFICATION COMPLIED WITH.Jul 20, 2022 · N351CM · Boeing 767323SDR ASAA2022072039186Valve · inoperativeDUCT PERSSURE SPLIT OF 20 PSI, DURING CLIMB. LEFT 25 PSI RIGHT 45 PSI. GROUNDED - YES. REPLACED #1 PCV REF B737-900 AMM 36-12-02-400-801. OPS CK GOOD. CROSSOVER CK REF AMM 36-11-00-710-801 BOTH ENGINES NO DISCREPANCIES NOTED.Jul 20, 2022 · N459AS · Boeing 737990ERSDR SIMA20220720003Bleed Air Sys · dirtyE1 BLEED FAIL/DIVR TO LIT FOR MORE FUEL -C/A-T/S DLEED 1 FAIL MSG IAW FIM 36-11-00-810-809. CLEAN THE NAPRSOV FILTER IAW AMM 36-11-03. PERFORMED ENGINE PNEUMATIC BLEED SYSTEM OPERATIONAL CHECK IAW AMM 36-11-00. OPC GOOD. NO DEFECTS NOTED. MEL RESTORED.Jul 20, 2022 · N261NN · Emb ERJ170200LRSDR SWAA2022072230346Shutoff Valve · leaking#1 ENGINE OVERHEAT LIGHT ON CLIMB OUT AT FL210 LIGHT WENT OUT WHEN THRUST WAS REDUCED / [01] REF LOGPAGE 1946463 COMPLIED WITH FIM 26-10 TASK 811. FOUND LEAKING #1 ENGINE PRSOV. R&R PRSOV PER AMM 36-11-04. PERFORMED HIGH POWER ENGINE RUN PER AMM 71-00-00. NO DJul 18, 2022 · N474WN · Boeing 7377H4SDR ASAA2022071639095Regulator · inoperativeDURING ENG RUN FOR VIB SURVEY, #2 ENG BLEED AIR WOULD NOT SHUT OFF. GROUNDED - YES. REMOVED & REPLACED #2 ENG BLEED AIR REGULATOR REF B737-900 AMM 36-11-03. LEAK & OPS CHECKED GOOD.Jul 16, 2022 · N453AS · Boeing 737990ERSDR DALA2022071404889None · noneSHIP 6711 -ATB - DUE TO LT ENG BLEED AIR CYCLING CAUSING PACK TO TRIP. CORRECTIVE ACTION: REPLACED LEFT HP VALVE, HP CONTROLLER AND 450 SENSOR FOR THE LEFT BLEED. ACM CHANGED FOR THE RT PACK. ALL SENSE LINE LEAK CHECK GOOD. REPLACED LEFT FAN AIR TEMP SENSOR PEJul 14, 2022 · N6711M · Boeing 757232SDR YENA2022071100663Pressure Valve · failedFLT#937, JFK-STI. (AIRCRAFT DIVERTED TO FLL) 'FL330 ENROUTE CRUISE HAD AIR ENG 2 BLEED ABNORMAL PR ECAM. SEE PREVIOUS WRITE-UP ECON FLOW ON AS PER ECAM DID NOT CLEAR ACTION ITEM. COMPLETED ALL ITEMS AND QRH DIVERT TO FLL; REMOVED AND REPLACED PRV PER AMM 36-1Jul 10, 2022 · N999JQ · Airbus A321231SDR YENA2022071100661Bleed Air Sys · fault messageFLT#1755, BOS-DCA. (AIRCRAFT PERFORMED AN AIR TURN BACK TO BOS) ' AFTER TAKEOFF AND CLIMBING THROUGH 800', BLEED 1 OVERPRESS CAUTION. QRH COMPLETE. PSI OVER 120 UNTIL THRUST LEVER IDLE. AT IDLE PSI 20. RETURNED FOR NORMAL LANDING, BLEED 1 FAIL CAUTION. CAJul 10, 2022 · N358JB · Emb ERJ190100IGWSDR NACA2022070800001Eicas · fault messageR ENGINE HPSOV EICAS MESSAGE ON DESCENT. DEFERRED RIGHT ENGINE HPSOV PER MEL 36-11-02-02 CAT C @ 0730Z 8 JUL 22 MX PROCEDURES COMPLIED WITHJul 9, 2022 · N399CM · Boeing 767323SDR MASA2022070900186Bleed Air Sys · abnormalLH BLEED DUCT WARNING - CAUTION RETURN TO FIELDJul 9, 2022 · N928LR · Cndair CL6002D24SDR SWAA2022071126857Control Valve · failedAT FLT LEVEL 390 CABIN ALTITUDE LIGHT AND WARNING HORN CAME ON. CABIN PRESSURIZATION CLIMBING. EMERGENCY DECENT BEGAN. AT APPROX FLT LEVEL 180 PRESSURIZATION STBILIZED AND LIGHT AND HORN WENT OUT. / [01] C/W PART REPLACED TTG8Q00DFLA0;[02] ACCOMPLISHED CONDITIJul 7, 2022 · N906WN · Boeing 7377H4SDR NACA2022070400001Eicas · fault messageRIGHT ENGINE HPSOV EICAS MESSAGE ON DESCENT, ALSO ON STATUS PAGE. DEFERRED RIGHT ENGINE HPSOV REF MEL 36-11-02-02 CAT C, RH HPSOV SECURED TO CLOSED POSITION AT 0730Z ON 7/4/2022, INSTALLED PLACARD. ACCOMPLISHED BITE CHECK PER AMM 36-11-07, NO FAULT NOTED AT THJul 4, 2022 · N399CM · Boeing 767323SDR NACA2022070200001None · noneR ENGINE HPSOV STATUS MESSAGE IN FLIGHT. COMPLETED BITE CHECK IAW AMM 36-23-00, NO FAULT FOUND AIRCRAFT REMAINS ETOPS 180Jul 2, 2022 · N399CM · Boeing 767323SDR ASAA2022070238914Shutoff Valve · faulty"BLEED " LT ILLUMINATED AFTER ENG START. V-LIST ACCOMP LT RETURNED. R BLEED DUCT @ 0- PSI. GROUNDED - YES. REMOVED & REPLACED #2 ENG PRSOV PER B737-9 AMM 36-11-04. OPS & LEAKS CHECK GOOD. CLEARS MAINT MESSAGE.Jul 2, 2022 · N973AK · Boeing 7379SDR ASAA2022070139089Shutoff Valve · leakingRED BOX ON ENG #1 EGT DISPLAY. GROUNDED - YES. FOLLOWED B737-900 FIM 71-06 T ASK 805 STEP (F)(2). ACCOMPLISHED EEC BITE ON #1 ENGINE REF FIM 73-00 TASK 801. NO RECORDED ENG OR EGT FAULTS. EGT PROBES S1-S4 TEMPS ALL WITHIN ACCEPTABLE LIMITS. ACCOMPLISHED FIM 71Jul 1, 2022 · N487AS · Boeing 737990ERSDR DALA2022070604711None · noneSHIP 3304 - ATB- DUE TO NO. 1 ENGINE BLEED FAILED ON T/O WITH NO. 2 ENGINE HP BLEED ON MEL. CORRECTIVE ACTION: REPLACED PRV 4001HA, #1 ENGINE BLEED VALVE CONTROL SOLENOID AND THERMOSTAT. (8844896)Jul 1, 2022 · N804NW · Airbus A330323SDR ASAA2022070138912Regulator · leakingREF ASA LG PG 60489947 WHILE ACCOMPLISHING ASA TC: NG-364C-0001 ENGINE BLEED AIR HEALTH CHECK. FOUND #2 ENG HIGH STAGE REGULATOR BODY LEAKING AIR. GROUNDED - YES. REMOVED #2 ENG HIGH STAGE REGULATOR REF B737-900 AMM 36-11-07. INSTALLED #2 ENG HIGH STAGE REGULAJul 1, 2022 · N495AS · Boeing 737990ERSDR AALA202207053810Regulator Valve · inoperativeAIRCRAFT WAS GROUNDED: DEPARTED AUS, AFTER LEVEL OFF AT 24000 FT, FOUND WE COULD NOT COOL THE CABIN SUFFICIENTLY AND RETURNED TO AUS. REMOVED AND REPLACED HIGH STAGE REGULATOR PER JOB CARD 08L40036002. REMOVED AND REPLACED PRESSURE VALVE (AALA202207055589).Jul 1, 2022 · N807NN · Boeing 737SDR AALA202207055589Valve · inoperativeAIRCRAFT WAS GROUNDED: DEPARTED AUS, AFTER LEVEL OFF AT 24000 FT, FOUND WE COULD NOT COOL THE CABIN SUFFICIENTLY AND RETURNED TO AUS. REMOVED AND REPLACED HIGH STAGE REGULATOR (AALA202207053810) PER JOB CARD 08L40036002. REMOVED AND REPLACED PRESSURE VALVE.Jul 1, 2022 · N807NN · Boeing 737SDR 2022FA0000328Bushing · corroded5TH STAGE ENGINE BLEED CHECK VALVE WAS OVERHAUL AND SENT TO CUSTOMER IN FEB 2021. UNIT WAS RETURNED IN JUN 2022 WITH SEVERE CORROSION. THERE IS CURRENTLY AN SB 3202222-36-1888 THAT ADDRESSED CRACKED BUSHING SLEEVES AND TO REWORK THE FLAPPERS FOR AVOID VALVE FLJul 1, 2022 · N626N · Boeing 737SDR ASAA2022063038913Shutoff Valve · leakingAFTER TAKEOFF, RIGHT DUCT PRESSURE 10 LEFT DUCT PRESSURE 40. REMAINED THAT WAY THROUGHOUT CLIMB TO CRUISE ALTITUDE. GROUNDED - YES. AIR TURNBACK - REMOVED AND REPLACED #2 ENG PRSOV OPS AND LEAK CHECKED PER B737-900 AMM 36-11-04-400-801 (REF ASA LG PG 60489949)Jun 30, 2022 · N495AS · Boeing 737990ERSDR DALA2022070104598Valve · damagedSHIP 3928 -ATB- DUE TO ODOR IN CABIN. CORRECTIVE ACTION: INSPECTED CABIN EQUIPMENT, CARGO LIGHT BALLASTS AND GALLEY EQUIPMENT. PERFORMED ODI NO-GO PROCEDURES. REPLACED CABIN RECIRCULATION FILTERS. RAN ENGINES, APU AND BLEED SOURCES. NO TROUBLE INITIALLY FOUND.Jun 30, 2022 · N928DU · Boeing 737SDR ASAA2022062638852Rvdt · intermittentWHILE ACCOMPLISHING T/C 31-005-00 FOUND FAULT "BLEED FAMV RVDT R" LATCHED. GROUNDED - YES. PERFORMED B737-9 IFIM 31-00-00-810-803, FOUND MX MSG 36-12031 "ENGINE 2 FAMV RVDT SIGNAL IS OUT OF RANGE". PERFORMED IFIM 36-12-00-810-804, NO FAULT NOTED AFTER GROUND TJun 26, 2022 · N920AK · Boeing 7379SDR ASAA2022062638827Reservoir · leakingWITH FWD CAB AND AFT CAB TEMP CONTROLLERS ON FULL COLD ON THE GROUND, WITH BOTH ENGINES RUNNING AND ENGINE BLEED AIR RUNNING THE PACKS, NEITHER PACK WOULD COOL BELOW 20 DEGREES C IN THE SUPPLY DUCT. CABIN TEMPS WERE GETTING HOT. BOTH PACKS PRODUCED SUPPLY DUCTJun 26, 2022 · N468AS · Boeing 737990ERSDR 2022F00272None · noneQRF VUELO 674. PACK TRP OFF LEFT SIDE ILLUMINATE AND BLEED TRIP OFF LIGHT ILLUMINATED RIGHT SIDE. CORRECTIVE ACTION. DIUPATCH IAW MEL 21-01-01 CAT C FOR PACK TRIP. FOR BLEED TRIP FAULT ISOLATION PROCEDURE HAS BEEN PRFORMED IAW FIM 36-10 TASK 801 NO FOUND DISCRJun 26, 2022 · Boeing 73773ASDR ASAA2022062438833Rvdt · failedENGINE 1 SHOWS FAULT REF TC 31-005-00 BLEED FAMV RVDT SIGNAL OUT OF RANGE. 36-12030,. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM TASK 36-12-00-810-803. NO FAULTS FOUND. ACCOMPLISHED WIRING CHECKS PER STEP C(2)(C). CONTINUITY CHECKS WERE GOOD, PIN TO PIN AND PIN Jun 24, 2022 · N921AK · Boeing 7379SDR YENA2022062400616Pressure Switch · warning lightFLT#1019, JFK-DTW. (AIRCRAFT PERFORMED AN AIR TURN BACK TO JFK) ' BLEED 1 OVERPRESSURE ON TAKEOFF - WOULD NOT RESET PER QRH; T/S PER FIM 36-14-00-810-817-A. REMOVED AND REPLACED BLEED OVER PRESSURE SWITCH IAW AMM 36-14-01. OPS CHECK GOOD WITH ENGINE AT IDLE. AJun 20, 2022 · N337JB · Emb ERJ190100IGWSDR AALA202206226959Regulator Valve · faultyAIRCRAFT WAS GROUNDED: #1 ENGINE BLEED OFF EICAS MESSAGE. FLIGHT DIVERTED TO JFK, LANDING SAFELY. REPLACED #1 ENGINE PRESSURE REGULATING AND SHUTOFF VALVE (PRSOV) PER AMM 36-11-09. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECKS.Jun 20, 2022 · N726AN · Boeing 777323ERSDR UIEA2022061900612Bonding Jumper · broken#2 ENG R/H SIDE HAS 1EA BROKEN BONDING WIRE ( LOCATED ABOVE FUEL FILTER ) REMOVED & REPLACED #2 ENG R/H SIDE BONDING JUMPER TO THE HPSOV IAW B767 AMM 36-11-07</P>)Jun 19, 2022 · N1409A · Boeing 767306SDR DALA2022062104345Clamp · brokenSHIP 5644 - DIV - INTO SLC DUE TO R DUCT LEAK MSG AND NO ANTI-ICE AVAILABLE. CORRECTIVE ACTION: MTC FOUND BROKEN CLAMP IN RT PYLON. REPLACED CLAMP. REPLACED CARD FILE AND FIRE LOOP A DUE TO LP STATUS MSG.Jun 18, 2022 · N544US · Boeing 757251SDR DALA2022061704222Duct · leakingSHIP 3221 - ATB - DUE TO AIR L WING LEAK MESSAGE. UNABLE TO CONTINUE DUE TO ICING CONDITIONS. FOUND CRACKED BLEED SUPPLY DUCT IN THE KEEL BEAM AREA AND DUCT AT APU CHECK VALVE CRACKED AT FLANGE. CORRECTIVE ACTION: BOTH KEEL BEAM AREA SUPPLY DUCTS AND APU CHECKJun 17, 2022 · N321US · Airbus A320211SDR NACA2022061600001None · unknown10 MINUTES PRIOR TO ETP R ENGINE HPSOV EICAS MESSAGE. PERFORMED FIM 36-10 FAULT TREE 833. REPLACED HPSOV CONTROLLER AND OPS CHECK GOOD PER 36-1108 AMM. NO TRAX PART INFO.Jun 16, 2022 · N321CM · Boeing 767323SDR ASAA2022061538674Sensor · out of limits#1 ENG ANTI ICE AMBER LIGHT ILLUMIATED. GROUNDED - YES. FOUND MAINTENCE MESSAGE 36-21010. #1 ENG INTERMEDIATE DUCT PRESSURE SENSOR SIGNAL IS OUT OF RANGE. REMOVED AND REPLACED THE INTERMEDIATE MANIFOLD (PI) SENSOR. OPS CHECK AND LEAK CHECK GOOD. GROUND VERIFICJun 15, 2022 · N936AK · Boeing 7379SDR R61A2022061700397Bleed Air Sys · false indicationBLEED 2 FAIL, PERFORMED QRH PROCEDURE, MESSAGE EXTINGUISHED. BLEED 2 FAIL CAME ON AGAIN, CABIN ALTITUDE CONTINUED CLIMBING EVEN THOUGH WE WERE AT LEVEL FLIGHT. DECLARED EMERGENCY, LANDED WITHOUT INCIDENT. INSPECTED LEFT AND RIGHT PACK OUTLET DUCTS, NO DEFECTS Jun 14, 2022 · N640RW · Emb ERJ170100SESDR I5PA2022061168803Shutoff Valve · faultyR ENG HPSOV SECURED CLOSED DUE TO EICAS BLEED OFF MSG. R/R R ENG HPSOV PER AMM 36-11-07.Jun 11, 2022 · N688SL · Boeing 757230SDR I5PA2022061092205Shutoff Valve · faultyR ENG PRSOV INOP. R/R R ENG PRSOV PER AMM 36-11-19.Jun 10, 2022 · N922TS · Boeing 757260PFSDR ASAA2022060938619Modulating Valve · faultyMAINT LIGHT ILLUMINATED ON LANDING. GROUNDED - YES. REMOVED AND REPLACED FAN AIR MODULATING VALVE REF B737-9 AMM 36-12-03. OPS CHECK GOOD.Jun 9, 2022 · N932AK · Boeing 7379SDR ASAA2022060938609Modulating Valve · warning lightAMBER "MAINT" LIGHT ILLUMINATED. GROUNDED - YES. FOUND FAULT MESSAGE 36-12012. #2 ENGINE FAMV IS NOT IN COMMANDED POSITION. ACCOMPLISHED TASK B737-9 IFIM 36-12-00-810-802. RAN #1 AND #2 ENGINES TO ACCOMPLISH PNEUMATIC ENGINE ON - SYSTEM TEST REF B737-9 AMM 36-Jun 9, 2022 · N932AK · Boeing 7379SDR CALA2022060801464Duct · failedPER CREW AT 7000'' RIGHT DUCT LEAK LIGHT CAME ON WITH RIGHT BLEED DUCT LEAK EICAS MESSAGE. AT 14,000'' DUMPED 10,000 LBS FUEL. RAN CHECKLIST NO FIX. LANDED ROUGHLY 20,000 LBS OVERWEIGHT. ON P11 OPENED BUT REAPPEARS WHEN CLOSED. RAN FIM 26-18 FAULT TREE 804 BLOJun 8, 2022 · N663UA · Boeing 767322SDR 2022F00262Bleed Valve · failedL BLEED TRIPOFF LIGHT ILLUMINATED AFTER TAKEOFF, CABIN RATE OF CLIMB SHOWED 2500FT/MIN, CABIN ALTITUD WARNING WAS ACTIVATED. AIRCRAFT WAS NOT PRESSURIZING. CORRECTIVE ACTION: BLEED AIR REGULATOR VALVE WAS REMOVED AND REPLACED.Jun 6, 2022 · Boeing 73733ASDR 4DPA2022060600001None · noneISSUE-CREW REPORTED WITH PACK 2 ON MEL, PACK 1 OUTPUT INADEQUATE TO PRESSURIZE AIRCRAFT AND RETURNED TO KBUR. MX CORR ACTION-MX REPORTED NO FLOW OF AIR COMING FROM HEAT EXCHANGER EXHAUST, LH SIDE. PERFORMED THE INSPECTION/CHECK OF THE LH PACK DUCTS AND FOUND DJun 6, 2022 · N259JX · Emb EMB135LRSDR ASAA2022060638579Plug · detachedAFTER PERFORMING A NO BLEED TAKEOFF AND WHILE REESTABLISHING NORMAL CONFIGURATION, THE LEFT DUCT WAS PRESSURIZED REGARDLESS OF SWITCH POSITIONS, - ISOLATION VALVE CLOSED, APU AND #1 BLEED OFF, LEFT DUCT STILL PRESSURIZED. NEEDLE NOT STUCK. WE DID SEE SLIGHT MOJun 6, 2022 · N478AS · Boeing 737990ER
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