# Service difficulty reports: Boeing 737-400

A list on [Boeing 737-400](https://openairdocs.org/model/boeing-737-400.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 10 · 470 reports

- [SDR NACA2024021600001](https://openairdocs.org/sdr/NACA2024021600001.md): Pitot Head · failed · Feb 16, 2024 · N405K · Boeing 737400 · Pitot/Static System
  > FAILURE OF AIRSPEED INDICATORS. REPLACED CAPT L UPPER PITOT-STATIC PROBE IAW AMM 34-11-11. LH AND RH PITOT STATIC LEAK CHECK GOOD. FLUSHED DEBRIS OUT OF CAPT AND FO PITOT-STATIC TUBES PER AMM 34-11-01. UNIT IS UNKNOWN TO TRAX.
- [SDR NACA2023102700001](https://openairdocs.org/sdr/NACA2023102700001.md): Unknown · unknown · Oct 27, 2023 · N401YK · Boeing 737400 · Leading Edge Devices
  > DURING NRC: CA1502/253 AFTER CORROSION REMOVED CHK OVER LIMIT. REMOVED DAMAGED SKIN AT #3 SLAT T/E WEDGE UPPER SURFACE BETWEEN SS 36.5 AND SS 38.3. MADE THE REPAIR FILLER AND DOUBLER, INSTALLED REPAIRED PARTS AND PERFORMED PERMANENT 250 DEGREE CURE METAL BOND
- [SDR NACA2023102100003](https://openairdocs.org/sdr/NACA2023102100003.md): Unknown · unknown · Oct 21, 2023 · N401YK · Boeing 737400 · Fuselage Main, Structure
  > CABIN WINDOW FRAME GOT CORROSION ON STA 727G+10(L30). BS727+5, S-11L+15". REPAIRED PER SRM 56-20-02 AND EO 737-56-007
- [SDR NACA2023102100002](https://openairdocs.org/sdr/NACA2023102100002.md): Unknown · unknown · Oct 21, 2023 · N401YK · Boeing 737400 · Fuselage Main, Structure
  > CABIN WINDOW FRAME GOT CORROSION ON STA 727F+10(L29).1.BS727+6,S-11L+8" 2.BS727+11,S-11L+16". REPAIRED PER SRM 56-20-02
- [SDR NACA2023102100001](https://openairdocs.org/sdr/NACA2023102100001.md): Unknown · unknown · Oct 21, 2023 · N401YK · Boeing 737400 · Fuselage Main, Structure
  > CABIN WINDOW FRAME CORROSION ON STA 727C +10 (L26), REPAIRED PER SRM 56-20-02
- [SDR NACA2023102000001](https://openairdocs.org/sdr/NACA2023102000001.md): Light · failed · Oct 20, 2023 · N401YK · Boeing 737400 · Emergency Lighting
  > OPERATIONAL TEST FOUND EMERGENCY LIGHT FAILURE. REPLACE EMERGENCY LIGHT IAW AMM 33-51-51-962-016. OPS TEST NORMAL.
- [SDR K11A2023060700211](https://openairdocs.org/sdr/K11A2023060700211.md): Keelbeam · corroded · May 11, 2023 · N406CK · Boeing 737400 · Fuselage Main, Keel
  > CORROSION ON LWR KEEL BEAM WEB APPROX STA 606 RBL 6.
- [SDR 2022F00105](https://openairdocs.org/sdr/2022F00105.md): Tee Angle · corroded · Feb 10, 2022 · N401YK · Boeing 737400 · Fuselage Structure (General)
  > AFT CARGO FLOOR PANEL STA 727-STA 727D SHOWS AMUMINUM BUT-JOINT STRIP PRIMER & PAINT DETERIORATED. NRC495
- [SDR 2022F00078](https://openairdocs.org/sdr/2022F00078.md): Lens · cracked · Feb 9, 2022 · N401YK · Boeing 737400 · Emergency Lighting
  > FWD ENTRY DOOR AREA PLASTIC EXIT EMERGENCY EXIT SIGN BROKEN AT LOWER FWD CORNER.
- [SDR K11A2021102100108](https://openairdocs.org/sdr/K11A2021102100108.md): Keelbeam · cracked · Oct 21, 2021 · N311GT · Boeing 737400 · Wing Structure
  > LH KEEL BEAM UPPER CHORD CRACKED
- [SDR I5EA2021052600005](https://openairdocs.org/sdr/I5EA2021052600005.md): Battery Pack · no test · May 26, 2021 · N803TJ · Boeing 737400 · Emergency Lighting
  > AFT LH EMERGENCY BATTERY PACK IS BAD. REMOVED AND REPLACED AFT LH BATTERY PACK ASSY IAW B737-400 AMM 33-51-51 OPS CHECK GOOD.
- [SDR K11A2021020200041](https://openairdocs.org/sdr/K11A2021020200041.md): Power Supply · no test · Feb 2, 2021 · N730CK · Boeing 737400 · Emergency Lighting
  > DURING MAINTENANCE FOUND LEFT HAND EMERGENCY LIGHT INOP. CORRECTIVE ACTION & OTHER PERTINENT INFORMATION: FOUND SHORTED WIRE & CORRECTED AT R1 DOOR IAW SWPM 20-30-12, R&R BATTERY PACK IAW B737 AMM 33-51-51, OPS CHECK GOOD
- [SDR EE4Y2020041611279](https://openairdocs.org/sdr/EE4Y2020041611279.md): Frame · cracked · Apr 16, 2020 · N311GT · Boeing 737400 · Fuselage Main, Frame
  > UPPER FUSELAGE BS 303.9 FRAME-WEB WITH CRACRS AND ELONGATED HOLES,REPAIR. IT WAS REPAIRED FOLLOWING REPAIR INSTRUCTIONS UNDER SERVICE REQUEST:4-4741753894 AND IAW COOPESA EO COO-CO-2020-11245-R00.(REF: OB A1J003 ITEM 2-52).
- [SDR EE4Y2020041611278](https://openairdocs.org/sdr/EE4Y2020041611278.md): Support · corroded · Apr 16, 2020 · N311GT · Boeing 737400 · Wing, Landing Gear Attach Fittings
  > RH WING TRUNNION BEAM SUPPORT HOLE BORE WITH CORROSION,REPAIR. IT WAS REPAIRED FOLLOWING REPAIR INSTRUCTIONS UNDER SERVICE REQUEST: 4-4717774794 AND IAW COOPESA EO COO-EO-2020-11238-R00.(REF: JOB A1J003 ITEM 1-98).
- [SDR EE4Y2020041611277](https://openairdocs.org/sdr/EE4Y2020041611277.md): Support · corroded · Apr 16, 2020 · N311GT · Boeing 737400 · Wing, Landing Gear Attach Fittings
  > LH WING TRUNNION BEAM SUPPORT HOLE BORE WITH CORROSION,REPAIR.IT WAS REPAIRED FOLLOWING SERVICE REQUEST:4-4717811378 AND IAW COOPESA EO COO-CO-2020-11239 R00 (REF: JOB A1J003 ITEM 1-99).
- [SDR I5EA2019111301](https://openairdocs.org/sdr/I5EA2019111301.md): Power Supply · inoperative · Nov 13, 2019 · N803TJ · Boeing 737400 · Emergency Lighting
  > O/W EXIT EMERGENCY LIGHT INOP.
- [SDR I5EA20190920002](https://openairdocs.org/sdr/I5EA20190920002.md): Jackscrew · lack of lube · Sep 15, 2019 · N538CC · Boeing 737400 · Trailing Edge Flap Control System
  > DURING INITIAL CLIMB DURING RT TURN FELT A SERIES OF RAPID THUMPS LASTING ABOUT 1 SECOND FELT AS WELL IN THE CONTROL COLUMN THEN AFTER LEVEL OFF AT 3000' ANOTHER SERIES OF THUMPS AUTO PILOT DISENGAGED YAW DAMPER DIENGAGED RETURNED TO MIA FOR LANDING. SERVICED
- [SDR CA190812012](https://openairdocs.org/sdr/CA190812012.md): Support · worn · Aug 9, 2019 · Boeing 737400 · Fuselage Miscellaneous Structure
  > (CAN) DESCRIPTION: DURING HMV INSPECTION, TEE SUPPORTS FOUND WORN ON HALON FIRE EXTINGUISHING SYSTEM PART NUMBERS PD37-53-2873-1, FIVE IN TOTAL. WO 33428411 SNAG 216. INSPECTION TASK CARD 737-345-53-00-100-0030. GENERATING DOCUMENT NUMBER TSR 1753129. CORRECTI
- [SDR CA190812009](https://openairdocs.org/sdr/CA190812009.md): Inlet · cracked · Aug 8, 2019 · Boeing 737400 · Engine Cowling System
  > (CAN) DESCRIPTION: DURING AN HMV INSPECTION (737-345-70-842-01-01) A CRACK WAS FOUND AT THE 6 O`CLOCK POSITION OF THE @2 INLET COWL. REPLACING PART (TC# 20190812009)
- [SDR CA190809016](https://openairdocs.org/sdr/CA190809016.md): Structure · worn · Aug 6, 2019 · Boeing 737400 · Fuselage Main, Structure
  > (CAN) DURING HMV INSPECTION, LOWER L/H CHORD IN AIR CONDITIONING BAY FOUND WORN BEYOND ALLOWABLE LIMITS. INSPECTION TASK: 737-345-53-862-01-01, WORK ORDER 33421216, SNAG 135. PART REPLACED. (TC# 20190809016)
- [SDR CA190715016](https://openairdocs.org/sdr/CA190715016.md): Bolt · sheared · Jul 12, 2019 · Boeing 737400 · Landing Gear Brake System
  > (CAN) UPON REMOVING THE BRAKE UNIT ON #3, BOTH STUD SHEAR BOLTS WHERE FOUND TO BE BROKEN AND WERE FOUND INSIDE THE OLD BRAKE UNIT.. THE BRAKE UNIT, ITSELF WAS WORN TO LIMITS AND A FEW BRAKE PADS HAD SHIFTED. NEW SHEAR BOLTS INSTALLED. (TC# 20190715016)
- [SDR I5EA201906280002](https://openairdocs.org/sdr/I5EA201906280002.md): Battery Pack · failed · Jun 19, 2019 · N418US · Boeing 737400 · Emergency Lighting
  > DISCREPANCY: L-2 DOOR EMERGANCY BATTERY DOSE NOT HOLD CHARGE. CORRECTIVE ACTION: REMOVE AND REPLACED BATTERY PACK IAW B737-AMM 33-51-51 TEST OKAY IAW AMM 33-51-51.
- [SDR CA190608001](https://openairdocs.org/sdr/CA190608001.md): Wire · chafed · Jun 7, 2019 · Boeing 737400 · Engine Bleed Air System Wiring
  > (CAN) NR 1 BLEED POPS BREAKER. BLEED AIR REGULATOR REPLACED. REPLACED 2 WIRES FROM D1208 TO D3064 ON PRESSURE REGULATOR. FOUND BADLY CHAFED, WIRE #W1508-012-16R AND W1508-013-16R (TC# 20190608001)
- [SDR CA190329036](https://openairdocs.org/sdr/CA190329036.md): Mount · cracked · Mar 27, 2019 · Boeing 737400 · Air Distribution System
  > (CAN) DESCRIPTION: DURING ROUTINE INSPECTION OF PYLON WHILE PERFORMING SCHEDULED POWERPLANT REMOVAL AND INSTALLATION, BOTH FORWARD AND THE AFT ENGINE MOUNT ISOLATORS WERE FOUND TO HAVE CRACKS IN THE RUBBER. CORRECTION: ALL THREE MOUNTS BEING REPLACED.
- [SDR CA190214009](https://openairdocs.org/sdr/CA190214009.md): Starter · failed · Feb 13, 2019 · Boeing 737400 · Engine Starter
  > (CAN) #1 STARTER FAILED ON START UP. [ INTERNAL FAILURE] STARTER REPLACED IAW AMM 80-11-03.
- [SDR I5EA2018121700003](https://openairdocs.org/sdr/I5EA2018121700003.md): Battery Pack · inoperative · Dec 12, 2018 · N803TJ · Boeing 737400 · Emergency Lighting
  > DISCREPANCY: R/H AFT CABIN, ROW 10 EMERGENCY LIGHT INOP. CORRECTIVE ACTION: REPLACED BATTERY PACK, M01435 ROW 15, PER B737-400 AMM 33-51-81.
- [SDR I5EA2018121000002](https://openairdocs.org/sdr/I5EA2018121000002.md): Air Data Module · smoke · Dec 8, 2018 · N803TJ · Boeing 737400 · Altimeter, Barometric/Encoder
  > DISCREPANCY: L/P 31547 ITEM 1 - F/O ALTIMETER AND AIRSPEED INDICATORS INOP. ITEM 2 - STRONG SMELL OF SMOKE IN CABIN AND COCKPIT. CORRECTIVE ACTION: L/P 31547 ITEM 1 - REPLACED #2 ADC, OPS CHECKS GOOD IAW AMM 34-12-11. ITEM 2 - PERFORMED CONDITIONAL INSP I
- [SDR 2018FA0000285](https://openairdocs.org/sdr/2018FA0000285.md): Clevis · corroded · Jul 24, 2018 · Boeing 737400 · Empennage Structure
  > RT STAB AFT SPAR FITTING AFT LOWER CLEVIS FACE HAS CORROSION.
- [SDR 2018FA0000284](https://openairdocs.org/sdr/2018FA0000284.md): Lug · corroded · Jul 24, 2018 · Boeing 737400 · Empennage Structure
  > RT STAB AFT LOWER SPAR JOINT LUG HAS CORROSION ON FWD FACE.
- [SDR 2018FA0000282](https://openairdocs.org/sdr/2018FA0000282.md): Clevis · corroded · Jul 24, 2018 · Boeing 737400 · Empennage Structure
  > RIGHT STAB AFT FITTING FWD LOWER CLEVIS FWD FACE HAD CORROSION.
- [SDR 2018FA0000281](https://openairdocs.org/sdr/2018FA0000281.md): Clevis · corroded · Jul 24, 2018 · N25773 · Boeing 737400 · Vertical Stabilizer Miscellaneous Structure
  > RT STAB AFT FITTING FWD CENTER CLEVIS FWD FACE HAS CORROSION.
- [SDR 2018FA0000279](https://openairdocs.org/sdr/2018FA0000279.md): Lug · corroded · Jul 23, 2018 · Boeing 737400 · Horizontal Stabilizer Structure
  > RIGHT STAB AFT CENTER SPAR JOINT LUG HAS CORROSION ON FWD FACE
- [SDR 2018FA0000278](https://openairdocs.org/sdr/2018FA0000278.md): Clevis · corroded · Jul 23, 2018 · Boeing 737400 · Horizontal Stabilizer Structure
  > RIGHT STAB AFT SPAR FITTING FWD CENTER CLEVIS FWD FACE HAD CORROSION
- [SDR 2018FA0000277](https://openairdocs.org/sdr/2018FA0000277.md): Clevis · corroded · Jul 23, 2018 · Boeing 737400 · Horizontal Stabilizer Structure
  > RT STAB AFT SPAR FITTING AFT CENTER CLEVIS AFT FACE HAS CORROSION.
- [SDR 2018FA0000276](https://openairdocs.org/sdr/2018FA0000276.md): Clevis · corroded · Jul 23, 2018 · Boeing 737400 · Horizontal Stabilizer Structure
  > LEFT STAB REAR SPAR UPPER FWD CLEVIS HAS CORROSION (AIRCRAFT SIDE)
- [SDR 2018FA0000275](https://openairdocs.org/sdr/2018FA0000275.md): Lug · corroded · Jul 23, 2018 · Boeing 737400 · Horizontal Stabilizer Structure
  > LEFT HORIZONTAL STABILIZER AFT ATTACH LUG UPPER BUSHING AFT FACE HAS CORROSION.
- [SDR 2018FA0000274](https://openairdocs.org/sdr/2018FA0000274.md): Clevis · corroded · Jul 23, 2018 · Boeing 737400 · Horizontal Stabilizer Structure
  > LEFT STABILIZER REAR SPAR UPPER AFT CLEVIS HAS CORROSION.
- [SDR 2018FA0000273](https://openairdocs.org/sdr/2018FA0000273.md): Clevis · corroded · Jul 23, 2018 · Boeing 737400 · Horizontal Stabilizer Structure
  > LEFT STAB. REAR SPAR FWD LOWER CLEVIS HAD CORROSION.
- [SDR 2018FA0000272](https://openairdocs.org/sdr/2018FA0000272.md): Clevis · corroded · Jul 23, 2018 · Boeing 737400 · Horizontal Stabilizer Structure
  > LEFT STABILIZER AFT SPAR FITTING LOWER CLEVIS HAS CORROSION.
- [SDR 2018FA0000271](https://openairdocs.org/sdr/2018FA0000271.md): Bushing · corroded · Jul 23, 2018 · Boeing 737400 · Horizontal Stabilizer Structure
  > LEFT HORIZONTAL STABILIZER AFT ATTACH LUG LOWER BUSHING AFT FACE HAD CORROSION, STAB SIDE.
- [SDR K11A2018043073001](https://openairdocs.org/sdr/K11A2018043073001.md): Warning Light · illuminated · Apr 30, 2018 · N730CK · Boeing 737400 · Bleed Air Indicating System
  > RIGHT BLEED TRIP OFF LIGHT ILLUMINATED ON TAKEOFF ROLL
- [SDR 2018FA0000153](https://openairdocs.org/sdr/2018FA0000153.md): Wire Harness · damaged · Apr 24, 2018 · N496CS · Boeing 737400 · APU System Wiring
  > WIRING DEFECTS WERE DISCOVERED ON AN OVERHAULED APU. DURING TROUBLESHOOTING OF THE WIRING DEFECTS ON THE APU THE WIRING HARNESS WAS FOUND IN POOR CONDITION. INCORRECT AND DANGEROUS SPLICES HAD BEEN FITTED WITH LOOSE & UNPROTECTED WIRES PROTRUDING FROM VARIOU
- [SDR EE4Y2018041906384](https://openairdocs.org/sdr/EE4Y2018041906384.md): Skin · cracked · Mar 26, 2018 · N306GT · Boeing 737400 · Wing, Plate/Skin
  > DURING THE ACCOMPLISHMENT OF SRM 57-20-10, REPAIR 4, FOUND THE LT WING UPPER SKIN, TWO FASTENER HOLES CRACKED. ONE FASTENER HOLE LOCATED AT FASTENER ROW 1, SPECIFICALLY AT WBL 181.4, IT WAS REPAIRED IAW SRM B737-57-20-10, REPAIR 7. THE OTHER FASTENER HOLE LO
- [SDR EE4Y2018041906385](https://openairdocs.org/sdr/EE4Y2018041906385.md): Spar · cracked · Mar 24, 2018 · Boeing 737400 · Wing Spar
  > DURING THE INSPECTIONS IAW SB 737-57A1318 R0 AND AD2014-12-13, THE LT WING, REAR SPAR UPPER SECTION CRACKED AT RSS 221. THE DAMAGED SPAR WAS REPAIRED IAW SRM 57-20-10, REPAIR 4.
- [SDR EE4Y2018041806376](https://openairdocs.org/sdr/EE4Y2018041806376.md): Attach Fitting · corroded · Mar 24, 2018 · N306GT · Boeing 737400 · Fuselage Main, Attach Fittings
  > DURING AN INSPECTION OF THE A/C BAY AREA, FOUND AT LT PRIMARY AND SECONDARY HEAT EXCHANGERS AREA, THE ATTACHING FRAME WITH SEVERAL POINTS OF CORROSION. THE DAMAGED AREA WAS REPAIRED IAW SR 4-3996015419.
- [SDR EE4Y2018041806375](https://openairdocs.org/sdr/EE4Y2018041806375.md): Link · corroded · Mar 24, 2018 · N306GT · Boeing 737400 · Main Landing Gear
  > DURING A STRUCTURAL INSPECTION, THE SWING LINK WAS FOUND CORRODED AROUND ONE OF ITS BORES, THE AFFECTED SWING LINK WAS REPLACED IAW AMM 57-15-00.
- [SDR EE4Y2018041906379](https://openairdocs.org/sdr/EE4Y2018041906379.md): Skin · corroded · Mar 21, 2018 · N306GT · Boeing 737400 · Fuselage Main, Plate/Skin
  > FOUND THE SKIN BETWEEN LBL 45.61 AND LBL 65 AT STRINGER 1C, WITH CORROSION. THE DAMAGED AREA WAS REPAIRED IAW SR 3-4185490079.
- [SDR EE4Y2018041906378](https://openairdocs.org/sdr/EE4Y2018041906378.md): Vertical Beam · cracked · Mar 20, 2018 · N306GT · Boeing 737400 · Fuselage Main, Bulkhead
  > DURING INSPECTION OF THE BS 178 BULKHEAD, FOUND A VERTICAL BEAM CRACKED AT RBL 5.7 AND WBL 181.5. THE DAMAGED VERTICAL BEAM WAS REPAIRED IAW SB 737-53A1225.
- [SDR EE4Y2018041806377](https://openairdocs.org/sdr/EE4Y2018041806377.md): Support Angle · corroded · Mar 15, 2018 · N306GT · Boeing 737400 · Fuselage, Landing Gear Attach Fittings
  > DURING THE INSPECTION OF THE MAIN LANDING GEAR AREA, IT WAS FOUND AT BS 706, RBL 65 AND WBL 200, THE SUPPORT ANGLE P/N 65-50733-34, VERTICAL FLANGE WITH CORROSION. THE DAMAGED ANGLE WAS REPAIRED PER AEI EO6410 INSTRUCTIONS AND APPROVED UNDER FAA FORM 8110-3, P
- [SDR EE4Y2018041906383](https://openairdocs.org/sdr/EE4Y2018041906383.md): Spar · damaged · Mar 12, 2018 · N306GT · Boeing 737400 · Trailing Edge Flaps
  > DURING A STRUCTURAL INSPECTION, FOUND THE LT WING, INBD MID FLAP DENTED ON THE NOSE SKIN INBD END, FOUND BEYOND SRM LIMITS. THE DAMAGED SKIN SECTION WAS TRIMMED OFF AND FOUND THE FRONT SPAR LOWER SECTION CRACKED AND CORRODED. THE DAMAGED SKIN AND SPAR SECTION

Next page: https://openairdocs.org/model/boeing-737-400/reports.md?page=2

## 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 = '737400'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/model/boeing-737-400/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.