# Service difficulty reports: Boeing 737-4C9 A list on [Boeing 737-4C9](https://openairdocs.org/model/boeing-737-4c9.md). Newest first. General aviation reporting is voluntary. - [SDR K11A2026102200405](https://openairdocs.org/sdr/K11A2026102200405.md): Pressure Switch · failed · Oct 22, 2026 · N730CK · Boeing 7374C9 · Hydraulic System, Main > DURING TAKEOFF ROLL MASTER CAUTION, FLT CONT AND HYD ANNUNCIATOR LIGHTS ILLUMINATED, FLT CONTROL LOW PRESSURE A LIGHT ILLUMINATED, DURING TAKE OFF ROLL STBY RUDDER ON ANNUNCIATOR LIGHTS ILLUMINATED. REMOVED AND REPLACES SYSTEM A LOW PRESSURE SWITCH IAW AMM 27 - [SDR K11A2026100600394](https://openairdocs.org/sdr/K11A2026100600394.md): Actuator · failed · Oct 6, 2026 · N730CK · Boeing 7374C9 · Landing Gear Actuator > RED LEFT GEAR LIGHT STAYED ON WITH GEAR LEVER IN THE UP POSITION IN FLIGHT, RED AND GREEN LIGHT BOTH ON WITH GEAR LEVER IN THE OFF POSITION IN FLIGHT. LEFT GEAR SHOWS DOWN WHEN GEAR LEVER PUT IN DOWN POSITION REF LOG PAGE 737-004-5748. REMOVE AND REPLACED THE - [SDR K11A2026092900393](https://openairdocs.org/sdr/K11A2026092900393.md): Module · intermittent · Sep 29, 2026 · N730CK · Boeing 7374C9 · Landing Gear Retraction/Extension System > RED LEFT GEAR LIGHT ON WITH GEAR LEVER UP IN FLIGHT. RED AND GREEN LEFT GEAR LIGHT ON WITH GEAR LEVER IN OFF POSITION. LEFT YOKE DEFLECTION IN FLIGHT WITH AIRFRAME VIBRATION. LEFT GEAR SHOWS DOWN IMMEDIATELY WHEN GEAR LEVER PUT IN DOWN POSITION. COULD NOT DU - [SDR K11A2026042700379](https://openairdocs.org/sdr/K11A2026042700379.md): Indicator · failed · Apr 27, 2026 · N730CK · Boeing 7374C9 · Airspeed/Mach Indicator > AIRSPEED UNRELIABLE FO SIDE AND STICK SHAKER ACTIVATION AFTER TAKEOFF LP 737-004-1488. REF LP 737-004-1489 REJECTED T/O SPEED 70 KNOTS, AIRSPEED UNRELIABLE ON FO SIDE ON BOTH AIRSPEED AND EFIS. R&R MACH AIRSPEED INDICATOR IAW AMM 34-12-21, OPS CHECK GOOD NO D - [SDR K11A2026040400376](https://openairdocs.org/sdr/K11A2026040400376.md): Controller · failed · Apr 4, 2026 · N730CK · Boeing 7374C9 · Cabin Pressure Controller > AT FL 310 CABIN ALTITUDE WARNING LIGHT ILLUMINATED AND HORN SOUNDED, FOLLOWED QUICK ACTIONS ITEMS DECLARED EMERGENCY, IMITATED DESCENT, CABIN PRESSURE WAS CONTROLLABLE IN MANUAL MODE BELOW FL 240. TRANSFERRED TO DMI #73000189 CAT C DUE 4/14/2026 IAW B737 KC2 M - [SDR K11A2025050800318](https://openairdocs.org/sdr/K11A2025050800318.md): Battery · inoperative · May 8, 2025 · N730CK · Boeing 7374C9 · Emergency Equipment > 2 EACH FLASHLIGHT BATTERIES REQUIRE REPLACED - NO FLASHING RED LIGHT BELOW COURIER SEAT BY L-1 DOOR. REMOVED AND REPLACED EMERGENCY FLASHLIGHT BATTERY AT BELOW COURIER SEAT BY L-1 DOOR IAW B737-345 AMM 25-64-05 NO DEFECTS NOTED - [SDR K11A2025050800317](https://openairdocs.org/sdr/K11A2025050800317.md): Battery · inoperative · May 8, 2025 · N730CK · Boeing 7374C9 · Emergency Equipment > EMERGENCY FLASHLIGHT AT CAPT'S POSITION RED BATTERY CHARGE INDICATION LIGHT NOT BLINKING BATTERIES REQUIRES REPLACED. REMOVED AND REPLACED EMERGENCY FLASHLIGHT BATTERY AT CAPTAINS POSITION IAW B737-345 AMM 25-64-05 NO DEFECTS NOTED - [SDR K11A2024012300250](https://openairdocs.org/sdr/K11A2024012300250.md): Unknown · smoke · Jan 23, 2024 · N703CK · Boeing 7374C9 · Air Distribution System > COURIER (LAV) AREA SMOKE IN FLIGHT - [SDR K11A2023080700225](https://openairdocs.org/sdr/K11A2023080700225.md): Seat Track · corroded · May 18, 2023 · N730CK · Boeing 7374C9 · Fuselage, Seat/Cargo Attach Fittings > EVIDENCE OF CORROSION ON MAIN DECK SEAT TRACK AT APPROX LBL 24 STA 957 - 986.5. - [SDR K11A2023080700226](https://openairdocs.org/sdr/K11A2023080700226.md): Seat Track · corroded · May 17, 2023 · N730CK · Boeing 7374C9 · Fuselage, Seat/Cargo Attach Fittings > MAIN DECK SEAT TRACK HAS EVIDENCE OF CORROSION AT APPROX STA 925.5 LBL 50.5. - [SDR K11A2023071000217](https://openairdocs.org/sdr/K11A2023071000217.md): Unknown · cracked · May 17, 2023 · N730CK · Boeing 7374C9 · Standard Practices/Structures > APPROX. 6 INCH LONG CRACK FOUND ON L/H STAB LOWER SURFACE AT APPROX STAB STA 129 AS MARKED. - [SDR K11A2022123000177](https://openairdocs.org/sdr/K11A2022123000177.md): Shutoff Valve · inoperative · Dec 30, 2022 · N730CK · Boeing 7374C9 · Engine Bleed Air System > BLEED TRIP OFF ILLUMINATED, WILL NOT RESET. AIRCRAFT UNABLE TO MAINTAIN REQUIRED ALTITUDE ON SINGLE OPERATING PACK. R & R NR 1 ENGINE PRSOV IAW AMM 36-11-15 LEAK AND OPS CHECK GOOD IAW AMM 36-05-00, NO DEFECTS NOTED - [SDR K11A2021121800106](https://openairdocs.org/sdr/K11A2021121800106.md): None · none · Dec 18, 2021 · N730CK · Boeing 7374C9 · Engine Exhaust System > PROBLEM DESCRIPTION: ON ROTATION A LOUD BANGING SOUNDS FROM THE #1 ENGINE, ERRATIC ENGINE INDICATION ON N1, TOWER REPORTED FLAMES OUT OF EXHAUST. CORRECTIVE ACTION & OTHER PERTINENT INFORMATION: AFTER VSB AND VBV RIGGING AND ADJUSTMENTS AND TWO ENGINE TESTS I - [SDR K11A2021012200039](https://openairdocs.org/sdr/K11A2021012200039.md): Bracket · corroded · Jan 22, 2021 · N730CK · Boeing 7374C9 · Standard Practices/Structures > LT WING OUTBOARD MIDFLAP BALLNUT SCREW ATTACHMENT BRACKET INBOARD HAS BOLT HOLE WITH CORROSION ON THE INNER DIAMETERS. - [SDR K11A2021011800038](https://openairdocs.org/sdr/K11A2021011800038.md): Cargo Track · corroded · Jan 18, 2021 · N730CK · Boeing 7374C9 · Fuselage, Seat/Cargo Attach Fittings > TIE DOWN TRACK, AFT PIT AT STA 747 LBL 18 HAS CORROSION AT AFT OUTBOARD NUT PLATE. - [SDR K11A2021020300042](https://openairdocs.org/sdr/K11A2021020300042.md): Attach Bracket · corroded · Jan 10, 2021 · N730CK · Boeing 7374C9 · Trailing Edge Flaps > L/H WING O/B MIDFLAP BALLNUT SCREW ATTACHMENT BRACKET I/B LOWER BOLTHOLE HAS CORROSION ON INNER DIAMETER. - [SDR K11A2021020200040](https://openairdocs.org/sdr/K11A2021020200040.md): Attach Bracket · corroded · Jan 10, 2021 · N730CK · Boeing 7374C9 · Trailing Edge Flaps > L/H WING O/B MIDFLAP BALLNUT SCREW ATTACHMENT BRACKET O/B HAS BOLT HOLE WITH CORROSION ON THE O/B LOWER BOLT HOLE - [SDR K11A2021011800037](https://openairdocs.org/sdr/K11A2021011800037.md): Angle · corroded · Jan 5, 2021 · N730CK · Boeing 7374C9 · Fuselage Main, Bulkhead > BULK PIT, AFT BULKHEAD LOWER ANGLE HAS EVIDENCE OF CORROSION AFT SURFACE STA 907 LBL 16. - [SDR K11A2020082600009](https://openairdocs.org/sdr/K11A2020082600009.md): Eec · malfunctioned · Aug 26, 2020 · N730CK · Boeing 7374C9 · Fuel Controlling System > #1 ENGINE EGT REACHED 925 DEG. STOPPED IT IN LESS THAN 1 SECOND ON TAKEOFF. PERFORMED VISUAL INSPECTION OF ENGINE NR 1 INLET AND EXHAUST, IAW B737 AMM 72-00-00, NO DEFECTS NOTED AT THIS TIME. PERFORMED FURTHER TROUBLE SHOOTING UNDER RO 730-0626 AND KM34 NR N - [SDR K11A202006033001](https://openairdocs.org/sdr/K11A202006033001.md): Web · cracked · Apr 28, 2020 · N730CK · Boeing 7374C9 · Cargo/Baggage Doors > FORWARD CARGO DOOR WEB CRACKED ON FWD BOTTOM SIDE STA 443 WL 167. - [SDR K11A2020012973001](https://openairdocs.org/sdr/K11A2020012973001.md): Battery · discharged · Jan 29, 2020 · N730CK · Boeing 7374C9 · Emergency Lighting > DURING TERMINATION OF SERVICE CHECK, FOUND THE R1 DOOR EMERGENCY EXIT LIGHT INOPERATIVE. REMOVED AND REPLACED THE R1 DOOR EMERGENCY EXIT LIGHT BATTERY, OPS CHECKED GOOD IAW AMM 33-51-51. - [SDR K11A2018102900002](https://openairdocs.org/sdr/K11A2018102900002.md): Control Panel · faulty · Oct 24, 2018 · N730CK · Boeing 7374C9 · Cabin Pressure Control System > ON DEPATURE AIRCRAFT WOULD NOT PRESSURIZE, CABIN WOULD NOT HOLD PRESSURE IN AUTO OR MANUAL MODES, RETURNED TO KPHX FOR UNSCHEDULED LANDING. - [SDR K11A2018102900001](https://openairdocs.org/sdr/K11A2018102900001.md): Controller · inoperative · Oct 24, 2018 · N730CK · Boeing 7374C9 · Cabin Pressure Controller > LOST CABIN PRESSURIZATION AT 16000 FT, RETURNED FOR UNSCHEDULED LANDING AT KRNO. ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql 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 = '7374C9' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/model/boeing-737-4c9/reports --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.