# Service difficulty reports: N27421

A list on [N27421](https://openairdocs.org/aircraft/N27421.md).

Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first.

- [SDR CALA2026100520099](https://openairdocs.org/sdr/CALA2026100520099.md): Adiru · faulty · Oct 3, 2026 · N27421 · Boeing 737924ER · Attitude and Direction Data System
  > IRS RT FAULT FOLLOWING FIM 34-21 TASK 803, PERFORMED BITE TEST AND FAULT MESSAGES ATTATCHED IN IMAGES. REMOVED AND REPLACED R ADIRU REF. AMM TASK 34-21-01-000-801 AND TASK 34-21-01-400-801. INSTALLATION TEST PASSED.PARTS USED: 60-3421-9-0001,QTY:1 POS - 2 MFG
- [SDR CALA2026061117038](https://openairdocs.org/sdr/CALA2026061117038.md): Check Valve · damaged · Jun 9, 2026 · N27421 · Boeing 737924ER · Air Distribution System
  > ON CLB A/C WOULDNT PRESS TRIED TO RESET TO MAN AND ALT NO FIX DID NOTEOUTFLOW WAS SHOWING CL GROUND AIR CONNECTION CHECK VALVE BROKEN. REMOVED GROUND CONDITIONED AIR CHECK VALVE IAW AMM 21-21-01. INSTALLED GROUND CONDITIONED AIR CHECK VALVE IAW AMM 21-21-01
- [SDR CALA2026012613257](https://openairdocs.org/sdr/CALA2026012613257.md): Apu · odor · Jan 26, 2026 · N27421 · Boeing 737924ER · Airborne Auxiliary Power Unit (APU) System
  > STRONG ODOR OF FUEL ON TAXI TO FL200. ARRIVL BLW130 PAX AND FWD CABIN COMPLAINING SMOKE ODOR REPORT. PERFORMED WALK AROUND BEFORE & AFTER ENG RUN. NO LEAKS FOUND. FIM TASK 21-00 TASK 806 SECTION C. REPLACED TWO HEPA FILTERS IN FWD PIT, RAN ENGS SEPERATLY OD
- [SDR CALA2025090808567](https://openairdocs.org/sdr/CALA2025090808567.md): Unknown · odor · Sep 6, 2025 · N27421 · Boeing 737924ER · Air Distribution System
  > FA REPORTS ELECTRICAL SMELL COMING FROM CENTER LAV. NO ODOR OR SMOKE PRESENT AT THIS TIME. INSPECTED TRASH CAN FOR ANY EVIDENCE, ELECTRICAL OULET, LIGHTING, AND FLUSH MOTOR OPS NORMAL AMM 05-51-26-800-801-C1.
- [SDR CALA2025041603903](https://openairdocs.org/sdr/CALA2025041603903.md): Light · no discrepancy · Apr 13, 2025 · N27421 · Boeing 737924ER · Communications System
  > PAX CALL LIGHT ON AFT EMERGENCY EXIT SIGN DOES NOT COME ON WHEN USED INSPECTED LIGHT FIXTURE, NO DISCREPECIES NOTED. MEL 2310H APPROVED BY TOMC COMPLIED WITH MEL. RELAMPED OPS CHECKS GOOD
- [SDR CALA2025032503187](https://openairdocs.org/sdr/CALA2025032503187.md): Bracket · broken · Mar 24, 2025 · N27421 · Boeing 737924ER · Emergency Equipment
  > DOOR 2R GIRT BAR PLASTIC BRACKET BROKEN NIS ON RED TAPE ON GIRT BAR. CANNOT REMOVE PLASTIC RETAINER DUE TO TAPE IS TOO WIDE. OUTER RETAINER IS INTACT. EXTRA PART ON GIRT BAR ASSEMBLY REMOVED. GIRT BAR IS INTACT.
- [SDR CALA2025030702626](https://openairdocs.org/sdr/CALA2025030702626.md): Light · malfunctioned · Mar 5, 2025 · N27421 · Boeing 737924ER · Emergency Lighting
  > EMER LIGHT AT 20A FLASH ING OVERWING EXIT SIDEWALL LIGHT JUST BELOW EMERG EXIT SIGN FOUND FLASHING. RELAMPED REF AMM TASK 33-21-00-960-806. CHECKS OK.
- [SDR CALA2024083000515](https://openairdocs.org/sdr/CALA2024083000515.md): Audio Panel · faulty · Aug 27, 2024 · N27421 · Boeing 737924ER · HF Communications System
  > BOTH HF1 HF2 RADIOS UNABLE TO TXMT - WE CAN RECEIVE OK - ALL FRE QS AND MODES OF TXMT SAMETRIED PLANE TO PLANE HF RADIO CHECK, WAS ABLE TO RECEIVE, BUT COULD NOT TRANSMIT USING BOTH #1 & #2 HF. CHECKED CAPT AND FO HF1& HF2, BOTH RECEIVE ONLY. SLAVED IN HF1 XCV
- [SDR CALA2024081402208](https://openairdocs.org/sdr/CALA2024081402208.md): Floor Support · corroded · Aug 11, 2024 · N27421 · Boeing 737924ER · Fuselage Miscellaneous Structure
  > FLIGHT DECK FLOOR SUPPORT UPPER SURFACE CORROSION STA 270 BETWEEN LBL 10 RBL 10 REF AAR N/R 9893161 ACCOMPLISHED REPAIR TO LATERAL INTERCOSTAL FWD FLANGE FROM STA 270 BETWEEN LBL 10 TO RBL 10 AS PER ESR NO. 2022583-23-9500 ECRA 5321-02148 WORK ACCOMPLISHED BY
- [SDR CALA2024081202195](https://openairdocs.org/sdr/CALA2024081202195.md): Floorbeam · damaged · Aug 5, 2024 · N27421 · Boeing 737924ER · Fuselage Main, Floor Beam
  > AFT WET AREA FLOOR SUPPORT BEAM FWD FLANGE FASTENER HOLE CORR. AT LBL 48 STA 986.5- MKD DOT 012 REF. AAR N/R:9892709 ACCOMPLISHED REPAIR AT STA 986.5 FULL T-CAP REPLACEMENT AS PER B737-900ER SRM 53-870-51-219-4 ESR NO.2022583-1-9440 REF.
- [SDR CALA2024080602170](https://openairdocs.org/sdr/CALA2024080602170.md): Deck Plate · damaged · Aug 4, 2024 · N27421 · Boeing 737924ER · Fuselage Main, Structure
  > FLIGHT DECK FLOOR SKIN CREASE AT STA 259.5-5" LBL 3" REF AAR N/R 9893159 ACCOMPLISHED FLIGHT DECK FLOOR REPAIR AT STA 259.5IN AND LBL 3IN REF SRM 53-10-51-2R-2, FIG 203.
- [SDR CALA2024072902134](https://openairdocs.org/sdr/CALA2024072902134.md): Structure · cracked · Jul 24, 2024 · N27421 · Boeing 737924ER · Fuselage Structure (General)
  > MAIN CABIN FWD WET AREA L/H INNER CHORD CRACK AT STA 309 REF AAR N/R 9892617 REMOVED AND REPLACED MAIN CABIN FWD WET AREA L/H INNER CHORD FROM STA 259.5-360 AS PER B737-900ER DWG 141A8110 AND SRM 51- 40-02-0G-0 AND TREATED AND PRIMED FASTENER HOLES AS PER B73
- [SDR CALA2024072902132](https://openairdocs.org/sdr/CALA2024072902132.md): Structure · corroded · Jul 24, 2024 · N27421 · Boeing 737924ER · Fuselage Structure (General)
  > MAIN CABIN FWD WET AREA CORROSION AT R/H INNER CHORD UPPER SURFACE REF AAR N/R 9892613. REMOVED AND REPLACED R/H INNER CHORD FWD WET AREA FROM STA 259.5-260 AS PER SRM 51-40-02-0G-0 AND DWG 141A8320 AND TREATED AND PRIMED FASTNER HOLES AS PER AMM 51-21-41-37
- [SDR CALA2024081202194](https://openairdocs.org/sdr/CALA2024081202194.md): Stringer · corroded · Jul 22, 2024 · N27421 · Boeing 737924ER · Fuselage Main, Longeron/Stringer
  > CORROSION FOUND ALONG STRINGER 25L LOCATED BETWEEN STA 947.5 AND STA 986.5 REF AAR N/R 9893206 ACCOMPLISHED REPAIR ON STRINGER 25L BETWEEN STA 947.5 AND STA 986.5 AS PER B-737-900ER SRM 53-00-03-2R-1 REPAIR 1 PARAGRAPH 4 FIG 203 WORK ACCOMPLISHED BY V934258
- [SDR CALA2024050301308](https://openairdocs.org/sdr/CALA2024050301308.md): Wire · exposed · Apr 30, 2024 · N27421 · Boeing 737924ER · Light System Wiring
  > CLEANERS REPORT EXPOSED WIRES ROW 14BA. (LEFT HAND SIDE) WERE STILL NOT WORKING. UNABLE TO FURTHER TROUBLESHOOT DUE TO LACK OF TIME. FOUND EXPOSED WIRE TO BE BROKEN AND FOR THE EMERGENCY SEAT UNABLE TO READ OR RETREAVE SEVERED WIRE NUMBER (RED WIRE 22 LIGHTS.
- [SDR CALA2024041101041](https://openairdocs.org/sdr/CALA2024041101041.md): Heater · leaking · Apr 8, 2024 · N27421 · Boeing 737924ER · Potable Water System
  > WATER LEAKING UNDER FWD LAV SINK VANITY AT ARRIVAL, MM FOUND NO WATER PUTTLING IN THE LAVATORY, UNDER THE SINK OR IN THE GALLEY AREA OUTSIDE OF THE LAVATORY. MM COULD NOT DUPLICATE A LEAK BUT NOTED THAT THE BOTTOM OF THE WATER HEATER WAS WET. MM WILL BE CHANGI
- [SDR CALA2021092201643](https://openairdocs.org/sdr/CALA2021092201643.md): Bulkhead · cracked · Sep 21, 2021 · N27421 · Boeing 7379 · Wing Structure
  > SUPPORT TASK (722540): LEFT WHEEL WELL VERTICAL PRESSURE DECK WEB HAS APX.1" CRACK REQUIRE PERMANENT REPAIR. REF BY PEMCO NR 11252.0122
- [SDR CALA2021091501569](https://openairdocs.org/sdr/CALA2021091501569.md): Skin · cracked · Sep 13, 2021 · N27421 · Boeing 737924ER · Horizontal Stabilizer, Plate/Skin
  > CRACK INDICATION, LH HORIZONTAL STAB, LWR SKIN, STAB STA 166, AP PROXIMATELY 15.5 FWD OF AFT SPAR HFEC VERIFIED, APPROXIMATELY 1. 125" LENGHT, ENDS MARKED. REF BY PEMCO NR.11252.0160.
- [SDR CALA2019110101862](https://openairdocs.org/sdr/CALA2019110101862.md): Bulkhead · cracked · Oct 28, 2019 · N27421 · Boeing 737924ER · Fuselage Main, Bulkhead
  > LEFT WHEEL WELL VERICAL PRESSURE DECK WEB APPEARS TO BE CRACKED APPROX 1.0 LONG IDT - NEED TO VERIFY SUSPECT CRACK. LEFT WHEEL WELL VERICAL PRESSURE DECK WEB HAS A CRACK APPROX 1.0 LONG. PERFORMED NDT SURFACE INSPECTION PER 737 NDT MANUAL PART 6 51-00-00 PROC
- [SDR CALA2018062101481](https://openairdocs.org/sdr/CALA2018062101481.md): Stringer · corroded · Jun 15, 2018 · N27421 · Boeing 737924ER · Fuselage Main, Longeron/Stringer
  > STR 25L CORRODED AROUND RIVETS FROM STA 957 TO 963, REFERENCE HANGAR NON ROUTINE 9601522 STRINGER REPAIRED IN ACCORDANCE WITH SRM 53-00-03 REPAIR 1.
- [SDR CALA2018062101480](https://openairdocs.org/sdr/CALA2018062101480.md): Skin · cracked · Jun 15, 2018 · N27421 · Boeing 737924ER · Horizontal Stabilizer, Plate/Skin
  > LEFT SIDE HORIZONTAL STAB HAD A CRACK APPROXIMATELY 1 INCH LONG HSS 157.10, AND 16.5 INCHES FROM THE TRAILING EDGE. REPAIRED IAW SRM 53-10-01, REPAIR 11.
- [SDR CALA2017022400466](https://openairdocs.org/sdr/CALA2017022400466.md): Unknown · odor · Feb 24, 2017 · N27421 · Boeing 737924ER · Air Distribution System
  > BURNING SMELL IN CABIN AND COCKPIT WITH PACK ON CYCLED ON AND OFF. NO HELP RAN PACKS AND APU FOR CONTAMINATION REMOVAL. NO SMELL FOUND AFTER RUNNING PACKS. REF AMM 21-00-01
- [SDR CALA2015080700650](https://openairdocs.org/sdr/CALA2015080700650.md): Seat Track · cracked · Aug 5, 2015 · N27421 · Boeing 737924ER · Fuselage, Seat/Cargo Attach Fittings
  > RBL 24.75 FLOORBEAM SEAT TRACK FASTENER HOLE 2 & 4, HFEC INSPECTION SHOWS CRACK INDICATION. INSTALLED REPAIR IAW ECRA 5320-02563 & EA 5320-02076 REV I OP 4.
- [SDR CALA2015080700649](https://openairdocs.org/sdr/CALA2015080700649.md): Seat Track · cracked · Aug 5, 2015 · N27421 · Boeing 737924ER · Fuselage, Seat/Cargo Attach Fittings
  > RBL 45.50 FLOORBEAM SEAT TRACK FASTENER HOLE 2, HFEC INSPECTION SHOWS CRACK INDICATION. INSTALLED REPAIR IAW ECRA 5320-02564 & EA 5320-02076 REV I OP 4.
- [SDR CALA2015080700648](https://openairdocs.org/sdr/CALA2015080700648.md): Seat Track · cracked · Aug 5, 2015 · N27421 · Boeing 737924ER · Fuselage, Seat/Cargo Attach Fittings
  > LBL 45.50 FLOORBEAM SEAT TRACK FASTENER HOLE 2, HFEC INSPECTION SHOWS CRACK INDICATION. INSTALLED REPAIR IAW ECRA 5320-02564 & EA 5320-02076 REV I OP 3.
- [SDR CALA2015080300641](https://openairdocs.org/sdr/CALA2015080300641.md): Skin · cracked · Aug 3, 2015 · N27421 · Boeing 737924ER · Horizontal Stabilizer, Plate/Skin
  > IAW EA 5510-01843 CRACK INDICATION AT HORIZONTAL STABILIZER STATION 101.90, 11 INCHES FROM AFT SPAR, INBOARD ROW SIDE OF RIVETS. HORIZONTAL STABILIZER STATION 101.90 CRACK HAS BEEN REPAIRED IAW SRM 55-10-01 REPAIR 11. SEE TASKS & WIPS PERFORMED IN FLEET CYCL
- [SDR CALA2015080300640](https://openairdocs.org/sdr/CALA2015080300640.md): Skin · cracked · Aug 3, 2015 · N27421 · Boeing 737924ER · Horizontal Stabilizer, Plate/Skin
  > IAW EA 5510-01843 CRACK INDICATION AT HORIZONTAL STABILIZER STATION 138.70, TWO PLACES, 10 & 18 INCHES FROM AFT SPAR, INBOARD ROW SIDES OF RIVETS. HORIZONTAL STABILIZER STATION 138.70, CRACK HAS BEEN REPAIRED IAW SRM 55-1 0-01 REPAIR 11. SEE TASK & WIPS PERF
- [SDR CALA2015080300639](https://openairdocs.org/sdr/CALA2015080300639.md): Skin · cracked · Aug 3, 2015 · N27421 · Boeing 737924ER · Horizontal Stabilizer, Plate/Skin
  > IAW EA 5510-01843 CRACK INDICATION AT HORIZONTAL STABILIZER STATION 129.50, 9.5 INCHES FROM FRONT SPAR, INBOARD ROW SIDE OF RIVETS. HORIZONTAL STABILIZER STATION 29.50 CRACK HAS BEEN REPAIRED IAW SRM 55-1 0-01 REPAIR 11. SEE TASK & WIPS PERFORMED IN FLEET CY
- [SDR CALA2015031800175](https://openairdocs.org/sdr/CALA2015031800175.md): Transmitter · unserviceable · Mar 18, 2015 · N27421 · Boeing 737924ER · Trailing Flap Position Indicating System
  > FLAP ASYMMETRY OCCURRED WHEN FLAP HANDLE WAS SET TO 1. RIGHT FLAP WAS AT 1 & LT AT 2. TROUBLE SHOT IAW FIM 27-51-00-810-83. FAULT HIST FLT 0 DISPLAYED MSG 27- 52261. NO EXISTING FAULTS, NO MECHANICAL FAILURES FOUND. UPON INSPECTION OF LFT XMTR, RED INDEX
- [SDR CALA2009121400711](https://openairdocs.org/sdr/CALA2009121400711.md): Container · damaged · Dec 14, 2009 · N27421 · Boeing 737924ER · Escape Slide
  > EMERGENCY SLIDE FWD GALLEY SERVICE DOOR CONTAINER DENTED AND ABOUT TO FALL OFF. REMOVED AND REPLACED R-1 EMERGENCY ESCAPE SLIDE AND SHROUD REF AMM 25-66-01. OK FOR SERVICE. ROTABLE PARTS CHANGE WAS INDICATED - TT 1383213 S/N OFF 00806 SLIDE, B737NG, OFF 29
- [SDR CALA2008122201158](https://openairdocs.org/sdr/CALA2008122201158.md): Frame · damaged · Dec 20, 2008 · N27421 · Boeing 737924ER · Fuselage Main, Frame
  > DAMAGE TO RIGHT FUSELAGE, FORWARD AND AFT OF FORWARD CARGO DOOR, INCLUDING DOOR, ANTENNA, AND NLG TIRES. REPAIRED FUSELAGE PER SRM 53-00-01, ECRA 5331-01434 AND ECRA 5230- 01808.

## 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 n_number = 'N27421' AND registry_match = 'registration'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/aircraft/N27421/reports

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