Boeing 737-9

Service difficulty reports · 3,497

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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 = '7379'
  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 ASAA2022072539213Relay · faultyLEFT ELEV PITOT LIGHT ILLUMINATED AFTER ENGINE START. GROUNDED - YES. REPLACED RELAY R1070 PROBE AUTO HEAT RELAY "A." REF 737 SWPM 20-81 AND B737-9 WDM 30-31-11-1 SHEET 1.Jul 25, 2022 · N935AK · Boeing 7379 · Pitot/Static Anti-Ice SystemSDR ASAA2022072439172Overheat · illuminatedTHE WINDOW HEAT RIGHT SIDE SIDE ON LIGHT IS NOT ON WITH SWITCH ON. GROUNDED - YES. TURNED ON R/H SIDE WINDOW SWITCH AND 'ON' LIGHT OPERATES NORMALLY. ACCOMPLISHED WINDOW HEAT CONTROL UNIT SYS TEST AND BITE REF B737-9 AMM 30-41-11-710-801, NO DEFECTS NOTED.Jul 24, 2022 · N919AK · Boeing 7379 · Windshield/Door Rain/Ice RemovalSDR ASAA2022072439180Radar · inaccurateWX RADAR NOT ACCURATELY DISPLAYING THUNDERSTORM ACTIVITY. INTERMITTENT DISPLAY OF CELLS IN MANUAL AND AUTO. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM TASK 34-41-00. WEATHER RADAR OPERATIONAL TEST PER B737-9 AMM 34-41-00-710-801. OPS CHECKS GOOD. ACFT OK FOR SRVJul 24, 2022 · N942AK · Boeing 7379 · Inertial Guidance SystemSDR ASAA2022072339211Fire Handle · failed insp#2 ENG FIRE HANDLE DID NOT ILLUMINATE ON TEST. GROUNDED - YES. CONFIRMED CORE LEFT DETECTOR FAILED RESISTANCE TEST PER B737-9 IFIM 26-11-00-810-823, REMOVED & REPLACED ENG #2 CORE LEFT LOOP A FIRE DETECTOR AND PERFORMED INSTALLATION TEST GOOD REF B737-9 AMM 26Jul 23, 2022 · N934AK · Boeing 7379 · Detection SystemSDR ASAA2022072339195Sensor · intermittentMAINT MESSAGE FOR APU OIL OTY ON START UP. MESSAGE # 49-94304. GROUNDED - YES. FOUND MESSAGE 49-94304 (OIL LEVEL SENSOR SHOWS CIRCUT FAILURE.)ACCOMPLISHED B737-9 IFIM TASK 49-90-00 FOR MAINT MESSAGE.INITIAL EVALUATION TEST OK. CLEARED MAINT MESSAGE FAULT, NOT Jul 23, 2022 · N972AK · Boeing 7379 · APU Oil SystemSDR ASAA2022072339194Cap · openLARGE PUDDLE OF OIL DISCOVERED UNDERNEATH ENGINE #2 DURING PREFLIGHT. GROUNDED - YES. PERFORMED INSPECTION FOR OIL LEAK ON #2 ENG. FOUND CAP ON OIL TANK OPEN. SECURED CAP AND CLEANED ESIDU FROM AREA. B737-9 AMM 71-71-00-200-801-F00. OIL QTY IS WITH IN LIMITS PJul 23, 2022 · N978AK · Boeing 7379 · Engine Oil Storage (Airframe Furnished)SDR ASAA2022072339184Fmc · intermittentFMC DISAGREE GROUNDED - YES. PERFORMED FMC DISAGREE QRH PROCEDURE FROM ASA QRH PAGE 11.2. FMC DISAGREE MESSAGE NO LONGER DISPLAYED.Jul 23, 2022 · N921AK · Boeing 7379 · Flight Management Computing Hardware SystemSDR ASAA2022072339178Light · illuminatedFLT ATTENDANT REPORTS EMERGENCY EXIT LIGHTS IN AFT GALLEY AND ROW 30 ILLUMINATED ON LANDING THEN EXTINGUISHED ON TAXI IN. LANDING TOUCHDOWN WAS SMOOTH. GROUNDED - YES. C/W EMERGENCY LIGHT OPS TEST REF B737-9 AMM 33-51-00-720-801. OPS TEST GOOD.Jul 23, 2022 · N915AK · Boeing 7379 · Emergency LightingSDR ASAA2022072239183Pitot Tube · faultyAFTER LANDING WHEN LEFT PROBE HEAT WAS SWITCHED TO AUTO THE L ELEV PITOT LIGHT ILLUMINATED. GROUNDED - YES. REPLACED L/H ELEV PITOT PROBE IAW B737-9 AMM 27-31-94.Jul 22, 2022 · N935AK · Boeing 7379 · Pitot/Static Anti-Ice SystemSDR ASAA2022072239176Overheat · warning lightAFTER LANDING L2 WINDOW OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. RESET SYSTEM, TESTED PER B737-9 AMM 30-41-00-710-801, ETOPS GROUND FUNCTIONAL CHECK GOOD PER AMM 30-41-00-710-801.Jul 22, 2022 · N936AK · Boeing 7379 · Windshield/Door Rain/Ice RemovalSDR 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 7379 · Pneumatic Distribution SystemSDR ASAA2022072039196Ignition Sys · warning lightMAINT LIGHT ON OVERHEAD PANEL ILLUMINATED UPON LANDING. GROUNDED - YES. FOUND FAULTS FOR ENG1 AND ENG2 IGNITION LEFT RELEASED PER MEL 74-00-01B BOTH LT HAND IGN INOP. REPLACED IGNITION SWITCH S858 REF B737-9 WDM 74-31-11-1 PERFORMED EEC IGNITION TEST CHAN A+B Jul 20, 2022 · N291BT · Boeing 7379 · Ignition Harness (Distribution)SDR ASAA2022072039153Drive Unit · faultyWX RADAR IS WORKING INTERMITTENTLY. RED STREAK FROM A/C TO 10-11 O'CLOCK POSITION ON DISPLAY. GROUNDED - YES. PERFORMED WXR OPS TEST NORMAL, UNABLE DUPLICATE DISCREPANCY ON GROUND, FOR PRECAUTIONARY, REPLACED NEW ANTENNA DRIVE UNIT, PERFORMED INSTALLATION TESTJul 20, 2022 · N915AK · Boeing 7379 · Independent Position Determining SystemSDR ASAA2022071939138Autopilot Sys · inoperativeVNAV WOULD NOT STAY ARMED FOR TAKEOFF. AFTER AIRBORNE, VNAV STAYED ON AND WORKED NORMALLY. GROUNDED - YES. C/W B737-9 FIM TASK 22-11-00-810-D11. NO FAULTS FOUND.Jul 19, 2022 · N918AK · Boeing 7379 · Autopilot SystemSDR ASAA2022071839125Circuit Breaker · poppedF/O PITOT CAUTION LIGHT ILLUMINATED AT FL330. GROUNDED - YES. UPON INSPECTION FOUND C/B D5, F/O PITOT, TRIPPED. RESET C/B REFERENCE B737-9 AMM 20-60-01-860-801 C/B REMAINED SET. PERFORMED TEST OF PROBE HEATER SYSTEM PER AMM 30-31-00-730-801. ALL PROBES TEST GOJul 18, 2022 · N931AK · Boeing 7379 · Pitot/Static Anti-Ice SystemSDR ASAA2022071739079Pitot System · warning lightL ELEV PITOT HEAT LIGHT ON AFTER ENG START WITH PROBE HEAT SWITCHES IN AUTO. GROUNDED - YES. INSPECTED PITOT PROBE, C/W B737-9 AMM TASK 30-31-00-730-801 SUB TASK 30-31-00-750-801 OPS CHECK GOOD. LH ELEVATOR PITOT HEAT LT REMAINS OFF.Jul 17, 2022 · N935AK · Boeing 7379 · Pitot/Static Anti-Ice SystemSDR ASAA2022071639128Cabin Air Sys · warning lightOVERHEAD AMBER MAINT LIGHT ON AFTER LANDING. GROUNDED - YES. C/W BITE CHECK FOR R/H PACK AND FOUND MAINT MESSAGE 21-55011 RIGHT AIR CONDITIONING PACK EXIT RAM AIR DOOR ACTUATOR HAS A SIGNAL ERROR, C/W B737-9 IFIM REF TASK 21-51-00-810-804 THROUGH STEP C, VERIFJul 16, 2022 · N915AK · Boeing 7379 · Cabin Cooling SystemSDR ASAA2022071539086Fmc · expiredNAV DATABASE EXPIRED ON 7/13/2022. GROUNDED - YES. C/W ASA TASK CARD 34-ASA-05 FLIGHT MANAGEMENT COMPUTER NAVIGATION DATABASE UPDATE.Jul 15, 2022 · N942AK · Boeing 7379 · Flight Management Computing Hardware SystemSDR ASAA2022071439096Converter · faultyAPU FAULT LIGHT ILLUMINATED ON START ATTEMPT. GROUNDED - YES. REMOVED & REPLACED APU STARTER CONVERTER REF B737-9 AMM 49-41-21.Jul 14, 2022 · N933AK · Boeing 7379 · APU Start/Ignition SystemSDR ASAA2022071339048Autothrottle Sys · disengagedAUTOTHROTTLE DISENGAGED ON THE GROUND BEFORE TAKEOFF WOULD NOT RE-ENGAGE. GROUNDED - YES. ACCOMPLISHED AUTOTHROTTLE SYSTEM OPERATIONAL TEST REF B737-9 AMM 22-31-00-710-801. OP CK GOOD.Jul 13, 2022 · N933AK · Boeing 7379 · Auto Throttle SystemSDR ASAA2022071339073Pressure Switch · faulty#1 ENG FILTER BYPASS LIGHT ON DEPARTURE. GROUNDED - YES. REMOVED AND REPLACED #1 ENG MAIN FUEL/OIL HEAT EXCHANGER DIFFERENTIAL PRESS SWITCH. REF B737-9 AMM 73-11-12-000-801-G00/-400-801-G00.Jul 13, 2022 · N977AK · Boeing 7379 · Engine Fuel DistributionSDR ASAA2022071339056Heat Exchanger · faultyTROUBLESHOOTING RECOMMENDATIONS FOR #1 ENGINE MAIN FUEL/OIL HEAT EXCHANGER FAULT. GROUNDED - YES. REMOVED AND REPLACED #1 ENG MAIN FUEL/OIL HEAT EXCHANGER DIFFERENTIAL PRESSURE SENSOR REF B737-9 AMM TASKS 73-11-12-000-801-G00/-400-801-G00. OPS CHECK GOOD.Jul 13, 2022 · N977AK · Boeing 7379 · Engine Fuel DistributionSDR ASAA2022071239055Fmu · damagedDURING INSPECTION OF #1 ENGINE FUEL METERING UNIT FOUND DAMAGE DURING REMOVAL OF FMU SOLENOID JUST FWRD OF SB2 STRAIN REF ASA L/P 60220674 REQ P/N 8062-1155. GROUNDED - YES. REPLACED FUEL METERING UNIT REF B737-9 AMM 73-21-04-400-801 STEPS A-H OPERATIONAL TESTJul 12, 2022 · N977AK · Boeing 7379 · Fuel Controlling SystemSDR ASAA2022071239044Probe · warning lightAFTER LANDING WHEN A PROBE HEAT PLACED TO AUTO, L ELEV PITOT LIGHT ILLUMINATED. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM TASK 30-31-00-810-803. L ELEVATOR PITOT LIGHT NOT ILLUMINATED DURING CHECK.Jul 12, 2022 · N935AK · Boeing 7379 · Pitot/Static Anti-Ice SystemSDR ASAA2022071039081Modulating Valve · out of adjustMAINT LIGHT ON AFT OVERHEAD PANEL ILLUMINATED. GROUNDED - YES. PERFORMED AIR COND SYS TEST LEFT, FOUND FAULT 21-55090 LEFT TCV OUT OF RANGE. REPLACED LEFT PACK TCV IAW B737-9 AMM 21-51-10/401. OPS CHKD GOOD SYS TEST PASS.Jul 10, 2022 · N973AK · Boeing 7379 · Cabin Cooling SystemSDR ASAA2022071038979Fmc · faultedFMC DISAGREE. GROUNDED - YES. QRH PROCEDURE WAS ACCOMPLISHED ON INITIAL SET UP ON AIRCRAFT. FMC DISAGREE WAS REMOVED AT THE COMPLETION OF THE QRH.Jul 10, 2022 · N935AK · Boeing 7379 · Flight Management Computing Hardware SystemSDR ASAA2022070939005Control Panel · faultyWX RADAR DOES NOT ACCURATELY DISPLAY ACTIVE WEATHER IN AUTO MODE. APPEARS FUNCTIONAL IN MANUAL MODE ONLY + AUTO MODE UNDER 40 NM RANGE. GROUNDED - YES. PERFORMED WEATHER RADAR OPERATIONAL TEST REF B737-9 AMM 34-41-00-710-801 OPS CHECK NORMAL UNABLE TO DUPLICATJul 9, 2022 · N942AK · Boeing 7379 · Independent Position Determining SystemSDR ASAA2022070938984Fcu · faultyREF ASA TSR712591 TECH SERVICES REQUEST FOLLOW UP DUE TO HISTORY OF AFCS A/T DC-1 CIRCUIT BREAKER POPPING DURING ENGAGEMENT OF AUTO THROTTLE. FCC-A REPLACEMENT REQUIRED. GROUNDED - YES. REPLACED FCC-A REF B737-9 AMM 22-11-33. LRU REPLACEMENT TEST BITE GROUP #3Jul 9, 2022 · N926AK · Boeing 7379 · Autopilot SystemSDR ASAA2022070839030Radio · inoperativeHF 2 RADIO INOP. GROUNDED - YES. ADJUSTED HF 2 SENS. OPS CHECKS GOOD REF B737-9 AMM 23-11-00. INFLIGHT OPS TEST ON BOTH HF RADIOS Jul 8, 2022 · N937AK · Boeing 7379 · HF Communications SystemSDR ASAA2022070838985Hf Comm · failedHF 1 UNABLE TO ESTABLISH COMMUNICATIONS. GROUNDED - YES. OPS CHECKS GOOD REF B737-9 AMM 23-11-00. INFLIGHT OPS TEST ON BOTH HF RADIOS GOOD.Jul 8, 2022 · N937AK · Boeing 7379 · HF Communications SystemSDR ASAA2022070738998Gearbox · wornFOUND DAMAGE ON MATING SURFACE OF TRANSFER G/B SLIDER WHILE ACCOMPLISHING SBLEAP-1B-72-0317-BS7-1 #1 ENGINE. GROUNDED - YES. FOUND DAMAGE ON EDGE FLANGE PART IS OUT OF LIMITS NO DAMAGE ALLOWED IN THIS AREA REF B737-9 AMM 72-60-00-200-801-G00 STEP 2 (H4). REMOVJul 7, 2022 · N971AK · Boeing 7379 · Turbine Engine Accessory DriveSDR ASAA2022070738971Processor · looseWXR FAIL DISPLAYED ON BOTH ND. CB 6-1 D13 REMAINED IN. CYCLED SWITCHES TO NO EFFECT. GROUNDED - YES. REF B737-9 IFIM 34-00-00-810-845. RE-SEATED WEATHER RADAR PROCESSOR, REF B737-9 AMM TASK 34-41-42-400-801. GROUND VERIFICATION OPS NORMAL, REF WXR OPERATIONAL Jul 7, 2022 · N918AK · Boeing 7379 · Independent Position Determining SystemSDR ASAA2022070438928Actuator · faultyFOUND MAINT CAUTION LIGHT ILLUMINATED DURING PRE-FLIGHT. GROUNDED - YES. FOUND FAULT FOR LEFT EXHAUST ACTUATOR. REMOVED AND REPLACED LEFT RAM AIR EXHAUST ACTUATOR PER B737-9 AMM 21-51-27/401, OPS NORMAL. NO FAULTS FOUND. GROUND VERIFICATION SUCCESSFUL.Jul 4, 2022 · N933AK · Boeing 7379 · Cabin Cooling SystemSDR ASAA2022070438932Overheat · warning lightTHE RIGHT FWD (R1) WINDOW OVERHEAT LIGHT ILLUMINATED ON THE GROUND IN SEATTLE. RAN QRH PROCEDURE, LIGHT EXTINGUISHED AND STAYED EXTINGUISHED. GROUNDED - YES. PERFORMED WINDOW HEAT CONTROL UNIT SYSTEM TEST AND FOUND NORMAL. NO FAULT FOUND REF B737-9 AMM 30-41-1Jul 4, 2022 · N913AK · Boeing 7379 · Windshield/Door Rain/Ice RemovalSDR ASAA2022070438926Circuit Breaker · poppedWX RADAR FAIL ILLUMINATED. FOUND P-6-1-D13 CB POPPED. GROUNDED - YES. AIR TURNBACK - ACCOMPLISHED C/B RESET PROCEDURE REF B737-9 AMM 20-60-01 & SSM 34-41-11-102. NO DEFECTS NOTED. RADAR OP CK NORMAL. REF AMM 34-41-00-710-801.Jul 4, 2022 · N933AK · Boeing 7379 · Independent Position Determining SystemSDR ASAA2022070438924Eec · false indicationAMBER MAINT LIGHT ON OVERHEAD ILLUMINATED. GROUNDED - YES. EXT PWR WAS DISCONNECTED PREMATURELY. STATUS MENU LOGGED EEC FAULTS. ABLE TO CLEAR FAULTS. STATUS IS CLEAR. REF B737-9 AMM 31-65-00.Jul 4, 2022 · N976AK · Boeing 7379 · Fuel Controlling SystemSDR ASAA2022070438901Autopilot Sys · intermittentSPEED TRIM FAIL ON DESCENT. GROUNDED - YES. FCC-B LOGGED MSG 22-11186.TRIM CMD RESPONSE MONITOR. COULD NOT DUPLICATE MALFUNCTION. ACCOMPLISHED SPEED TRIM GROUP #20 BITE. NO DEFECTS NOTED. MEETS CRITERIA OF NUISANCE FAULT. REF B737-9 IFIM 22-11-00-810-C61.Jul 4, 2022 · N933AK · Boeing 7379 · Autopilot SystemSDR CALA2022070401644Brake Assy · cracked#2 MAIN BRAKE ASSY KEYS CRACKED. REMOVED AND REPLACED #2 MLG BRAKE ASSY. BLEEDING AND INSTALLATION TEST GOOD.Jul 4, 2022 · N37516 · Boeing 7379 · Brake Anti-Skid SectionSDR CALA2022070401643Tire · low pressure#4 MLG TIRE PRESSURE BELOW LIMITS. R/R #4 MLG WHEEL ASSY.Jul 4, 2022 · N37516 · Boeing 7379 · Tire TubeSDR CALA2022070401642Brake Assy · cracked#1 MAIN BRAKE ASSY KEYS CRACKED. REMOVED AND REPLACED # 1 BRAKE ASSY.Jul 4, 2022 · N37516 · Boeing 7379 · Brake Anti-Skid SectionSDR ASAA2022070338915Converter · failedAPU FAULT LIGHT DURING 2 APU START ATTEMPTS ON THE GROUND AFTER LANDING. GROUNDED - YES. PERFORMED B737-9 IFIM 31-00-00-810-803 FOUND FAULT 49-41254 START CONVERTER UNIT FAULT. REF APU BITE REF B737-9 AMM 49-61-00-700-801 PERFORMED IFIM 49-40-00-810-818. PER FJul 3, 2022 · N935AK · Boeing 7379 · APU Start/Ignition SystemSDR ASAA2022070338910Fmc · intermittentON THE GROUND, HAD FMC DISAGREE IN SCRATCH PAD AND NAV DISPLAYS. GROUNDED - YES. COMPLETED GROUND PROCEDURE FROM QRH, MESSAGE CLEARED.Jul 3, 2022 · N926AK · Boeing 7379 · Flight Management Computing Hardware SystemSDR ASAA2022070338894Ram Air Door · fault message"MAINT" LIGHT ILLUMINATED ON LANDING ROLLOUT. GROUNDED - YES. CHECKED STATUS MESSAGE PAGE & NOTED PACK RAM AIR L. PRESENT LEG FAULTS NOTED MAINT MESSAGE 21-55010. LEFT AIR CONDITIONING PACK EXIT RAM AIR DOOR ACTUATOR HAS A SIGNAL ERROR. C/W B737-9 IFIM INITIALJul 3, 2022 · N933AK · Boeing 7379 · Cabin Cooling SystemSDR ASAA2022070238942Valve · faulty#1 ENG AFTER START, START VALVE LIGHT REMAINS ON. GROUNDED - YES. ON DEFERRAL.Jul 2, 2022 · N934AK · Boeing 7379 · Engine CrankingSDR 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 7379 · Pneumatic Distribution SystemSDR ASAA2022070238898Control Panel · intermittentMCP BLANK. GROUNDED - YES. PERFORMED B737-9 IFIM 22-10-00-810-821MCP RETURNED TO NORMAL.Jul 2, 2022 · N913AK · Boeing 7379 · Autopilot SystemSDR ASAA2022070238896Actuator · faultyAFTER LANDING MAINT LIGHT ON OVERHEAD PANEL ILLUMINATED. GROUNDED - YES. STATUS PAGE SHOWING MSG: PACK RAM AIR SYSTEM R, MAINT MESSAGE 21-55001. B737-9 IFIM TASK 21-51-00-810-802, FOUND GOOD VOLTAGE AT RIGHT FORWARD RAM AIR ACTUATOR CONNECTOR D14394. BAD RIGHTJul 2, 2022 · N926AK · Boeing 7379 · Cabin Cooling SystemSDR ASAA2022070138906Circuit Breaker · faultyDURING APU START, AC FLAGGED A APU FAULT UNABLE TO ACCEPT A/C POWER (GROUND). GROUNDED - YES. REMOVED AND REPLACED AUX POWER BREAKER, C803 IN P91 POWER PANEL. OPS TEST GOOD; APU START WITH GEN TRANSFER SUCCESSFUL. REF B737-9 AMM 24-21-41. A/C EXT POWER OPS TESJul 1, 2022 · N291BT · Boeing 7379 · AC Generation SystemSDR ASAA2022070138902Autopilot Sys · warning lightPRIOR TO DESCENT MASTER CAUTION RECALL PUSHED. "FLT CONT" ILLUMINATED ALONG WITH "SPEED TRIM FAIL" LIGHT. BOTH LIGHTS EXTINGUISHED WHEN MASTER CAUTION LIGHT IS PRESSED. GROUNDED - YES. LAST LEG FCC B FAULTED SPEED TRIM. FCC A NO FAULTS. PERFORMED B737-9 IFIM 2Jul 1, 2022 · N935AK · Boeing 7379 · Autopilot SystemSDR ASAA2022070138893Cabin Air Sys · warning lightPILOTS REPORT "MAINT" LIGHT ON. GROUNDED - YES. FOUND "PACK TEMP CTRL PRIMARY L" STATUS MESSAGE, RAN B737-9 FIM 31-00-00-810-801 FOR FAULT CODE 215 102 41, MESSAGE CLEARED AND DEEMED TRANSITORY, NO FURTHER DEFECTS NOTED.Jul 1, 2022 · N973AK · Boeing 7379 · Cabin Cooling System
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