# Service difficulty reports: N77520

A list on [N77520](https://openairdocs.org/aircraft/N77520.md).

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

- [SDR CALA2026021813890](https://openairdocs.org/sdr/CALA2026021813890.md): Lamp · inoperative · Feb 13, 2026 · N77520 · Boeing 737824 · Emergency Lighting
  > L1 DOOR EXTERIOR EMERGENCY LIGHT INOPERATIVE. REPLACED THE LAMP IN THE EMERGENCY LIGHT, OPS CHECKED GOOD.
- [SDR CALA2026012713346](https://openairdocs.org/sdr/CALA2026012713346.md): Cover · broken · Jan 26, 2026 · N77520 · Boeing 737824 · Emergency Lighting
  > FLIGHT DECK, GENERAL VISUAL INSPECTION PROCEDURE - ROW 36ABC SEAT PATH LIGHT COVER BROKEN REPLACED ROW 36ABC SEAT PATH LIGHT IAW CMM 25-22-52-4675.
- [SDR CALA2026011613005](https://openairdocs.org/sdr/CALA2026011613005.md): Lubrication · odor · Jan 14, 2026 · N77520 · Boeing 737824 · Engine (Turbine/Turboprop)
  > BURNING ODOR THRU ENTIRE CABIN. OVENS AND COFFEEMAKERS OFF. DISSIPATED EVENTUALY BUT SLIGHT ACRID ODOR. PERFORMED ENGINE RUN IAW AMM 71-00-00 WITH PACKS ON. NO ODOR DETECTED. SUSPECT ODOR CAME FROM BLADE LUBRICATION DONE THE NIGHT PRIOR TO FLIGHT. NO FURTHE
- [SDR CALA2025111411199](https://openairdocs.org/sdr/CALA2025111411199.md): Slide · unpacked · Nov 12, 2025 · N77520 · Boeing 737824 · Escape Slide
  > DOOR 1R SLIDE PACK PARTIALLY OUT ITEM LOCKED UNLOCK. REPACKED R1 DOOR ESCAPE SLIDE IAW AMM 25-66-01-200-802 & AMM 25-66-01-400-801 FOR INSTALLATION OF SLIDE PACK.
- [SDR CALA2025111411198](https://openairdocs.org/sdr/CALA2025111411198.md): Slide · unraveled · Nov 12, 2025 · N77520 · Boeing 737824 · Escape Slide
  > DOOR 1R SLIDE PACK PARTIALLY OUT. LOCAL FBO TO PACK DOOR 1R SLIDE PACK. REPACKED R1 DOOR SLIDE IAW AMM REF 25-66-01.
- [SDR CALA2025040103395](https://openairdocs.org/sdr/CALA2025040103395.md): Lamp · inoperative · Mar 31, 2025 · N77520 · Boeing 737824 · Emergency Lighting
  > L2 EXTERIOR EMERGENCY LIGHT INOP/RELAMPED IAW 33-51-04. OPS CHEC K GOOD IAW B737-800 33-51-00-710-801. SUPPORT TASK NSA EMX NR 00 175. SDR COMPLETED REMOVED L2 EXTERIOR EMERGENCY LIGHT LENS ASSEMBLY IAW B737-800 AMM 33-51-04. REMOVED AND REPLACED L2 EXTERIOR E
- [SDR CALA2025013102148](https://openairdocs.org/sdr/CALA2025013102148.md): Hmu · faulted · Jan 27, 2025 · N77520 · Boeing 737824 · Fuel Controlling System
  > COULD NOT GET ENG 1 TO START. HAD PROPPER N2 BUT NO FF N1 OR RIS E IN EGT.UPDATED MAA CODE FIX USING VENDOR MAA SCREEN PLEASE CONTACT TOMC BEFORE COMMENCING ANY WORK. UPDATED MAA CODE FIX USING VENDOR MAA SCREEN PLEASE CONTACT TOMC BEFORE COMMENCING ANY WORK.
- [SDR CALA2025011301885](https://openairdocs.org/sdr/CALA2025011301885.md): Switch · faulted · Jan 9, 2025 · N77520 · Boeing 737824 · Door Warning System
  > FWD CARGO LIGHT ON OVHD PANEL WAS FLASHING ON AND OFF AND NOW IS NOT ON WITH DOOR OPEN. INSTALL INOPERATIVE STICKER ADJACENT TO FWD CARGO DOOR WARNING SYSTEM LIGHT ON FLIGHT DECK OVERHEAD PANEL. REMOVED AND REPLACED FWD CARGO SWITCH IRW AMM 52-71-31. OPS CHEC
- [SDR CALA2024112001218](https://openairdocs.org/sdr/CALA2024112001218.md): Light · inoperative · Nov 18, 2024 · N77520 · Boeing 737824 · Emergency Lighting
  > ROW 20ABC EMERGENCY EXIT AISLE PATH LIGHTING AFT RED LIGHT INOP. REMOVED AND REPLACED AFT EMERGENCY EXIT AISLE PATH LIGHT AT ROW 20ABC. OPS CHECK GOOD.
- [SDR CALA2024112001216](https://openairdocs.org/sdr/CALA2024112001216.md): Light · inoperative · Nov 18, 2024 · N77520 · Boeing 737824 · Emergency Lighting
  > ROW 15ABC EMERGENCY EXIT AISLE PATH LIGHTING AFT RED LIGHT INOP. REMOVED AND REPLACED AFT EMERGENCY EXIT AISLE PATH LIGHT AT ROW 15ABC. OPS CHECK GOOD.
- [SDR CALA2023022000498](https://openairdocs.org/sdr/CALA2023022000498.md): Coupler · none · Feb 20, 2023 · N77520 · Boeing 7378 · UHF Communications System
  > BOTH HF RADIOS INOP. PERFORMED T/S ON HF RADIOS IN REF AVO10462. ALL WIRING AND CONTACTED SFO ON HF1 AND HF2 AT FREQ. 5.547 & 3.413, 3X3 AT 2:36 CONNECTIONS CHECKED OK. PER AVO STEPS 8 AND 9, REMOVED AND AM. OPS CHK OK. PARTS USED: 1924814,QTY:1 REPLACED HF
- [SDR CALA2023010900059](https://openairdocs.org/sdr/CALA2023010900059.md): Hf Comm · inoperative · Jan 9, 2023 · N77520 · Boeing 737824 · UHF Communications System
  > HF RADIOS WILL NOT TRANSMIT BITE BOTH NUMBER 1 AND NUMBER 2 TRANSCEIVERS, BITE TEST OK. GROUND OPS CHK NUMBER 1 AND 2 HF RADIOS CALLING SFO READ LOUD AND CLEAR. R&R NUMBER 1 HF TRANSCEIVER PER PRECAUTIONARY. GROUND OPS CHK OK.
- [SDR CALA2022111103102](https://openairdocs.org/sdr/CALA2022111103102.md): Rib · cracked · Nov 9, 2022 · N77520 · Boeing 737824 · Horizontal Stabilizer, Spar/Rib
  > R/H HORIZONTAL STABILIZER RIB 92.7 1ST VERTICAL STIFFENER CRACKE D. REF BY PEMCO NR.12738.0688. REPAIRED CRACKED R/H HORIZ STABILIZER IN SPAR RIB 92.7 1ST STIFFENER FROM L/E IAW B737 SRM 55-10-09-2R-4. COMPLETED BY P112,INSP BY Q966, ENTERED BY V928371. APPRO
- [SDR CALA2022111103116](https://openairdocs.org/sdr/CALA2022111103116.md): Rib · cracked · Nov 9, 2022 · N77520 · Boeing 737824 · Horizontal Stabilizer, Spar/Rib
  > EA 5510-01843 REV H: STA 92.70 4TH STIFFNER ABOVE CHEM MILL VISUAL CRACK INDICATION. REPAIRED L/H HORIZ STABILIZER IN SPAR RIB 92.7 4TH STIFFNER FROM L/E IAW B737 SRM 55-10-09-2R-4.
- [SDR CALA2022111103115](https://openairdocs.org/sdr/CALA2022111103115.md): Rib · cracked · Nov 9, 2022 · N77520 · Boeing 737824 · Horizontal Stabilizer, Spar/Rib
  > EA 5510-01843 REV H: STA 101.90 4TH STIFFNER ABOVE CHEM MILL VISUAL CRACK INDICATION. REPAIRED L/H HORIZ STABILIZER IN SPAR RIB 101.9 4TH STIFFENER FR OM L/E IAW B737 SRM 55-10-09-2R-4.
- [SDR CALA2022111103114](https://openairdocs.org/sdr/CALA2022111103114.md): Rib · cracked · Nov 9, 2022 · N77520 · Boeing 737824 · Horizontal Stabilizer, Spar/Rib
  > R/H HORIZONTAL STABILIZER RIB 92.7 4TH VERTICAL STIFFENER CRACKED. REPAIRED CRACK ON R/H HORIZ STABILIZER IN SPAR RIB 92.7 4TH VERT ICAL STIFFENER FROM L/E IAW B737 SRM 55-10-09-2R-4.
- [SDR CALA2022111103113](https://openairdocs.org/sdr/CALA2022111103113.md): Rib · cracked · Nov 9, 2022 · N77520 · Boeing 737824 · Horizontal Stabilizer, Spar/Rib
  > R/H HORIZONTAL STABILIZER RIB 92.7 3RD VERTICAL STIFFENER CRACKE D. REPAIRED CRACKED R/H HORIZ STABILIZER IN SPAR RIB 92.7 3RD STIFFENER FROM L/E IAW B737 SRM 55-10-09-2R-4.
- [SDR CALA2022111103112](https://openairdocs.org/sdr/CALA2022111103112.md): Rib · cracked · Nov 9, 2022 · N77520 · Boeing 737824 · Horizontal Stabilizer, Spar/Rib
  > R/H HORIZONTAL STABILIZER RIB 92.7 2ND VERTICAL STIFFENER CRACKED. REPAIRED CRACKED R/H HORIZ STABILIZER IN SPAR RIB 92.7 2ND STIFFERNER FROM L/E IAW SRM 55-10-0G2R-4.
- [SDR CALA2022110403044](https://openairdocs.org/sdr/CALA2022110403044.md): Rib · cracked · Nov 2, 2022 · N77520 · Boeing 737824 · Horizontal Stabilizer, Spar/Rib
  > EA 5510-01843 REV H: STA 120.30 3RD STIFFNER ABOVE CHEM MILL VISUAL CRACK INDICATION. REF BY PEMCO NR.12738.0668 INSP BY ENTERED BY REPAIRED RIB STA 120.3 STIFFNER NO.3 AT LT HORIZONTAL STAB AS PE R REF B737 SRM 55-10-09 REPAIR 4 DETAIL A. COMPLETED BY APPROVE
- [SDR CALA2022102402937](https://openairdocs.org/sdr/CALA2022102402937.md): None · cracked · Oct 24, 2022 · N77520 · Boeing 737 · Empennage Structure
  > STA 92.70 4TH STIFFNER ABOVE CHEM MILL VISUAL CRACK INDICATION. REF BY PEMCO NR.12738.0666. REPAIRED L/H HORIZ STABILIZER IN SPAR RIB 92.7 4TH STIFFNER FROM L/E IAW B737 SRM 55-10-09-2R-4. COMPLETED BY P112, INSP BY Q945, ENTERED BY V928371. APPROVAL BY Q966.
- [SDR CALA2022102402929](https://openairdocs.org/sdr/CALA2022102402929.md): None · cracked · Oct 24, 2022 · N77520 · Boeing 737 · Empennage Structure
  > EA 5510-01843 REV H: STA 129.5 3RD STIFFNER ABOVE CHEM MILL VISUAL CRACK INDICATION. REF BY PEMCO NR.12738.0670. REPAIRED R/H HORZ STABILIZER IN SPAR RIB 129.5 3RD STIFFNER FROM L/E IAW B737 SRM 55-10-09-2R-4. COMPLETED BY P112, INSP BY Q945, ENTERED BY V9283
- [SDR CALA2022102402928](https://openairdocs.org/sdr/CALA2022102402928.md): None · cracked · Oct 24, 2022 · N77520 · Boeing 737 · Empennage Structure
  > STA 101.90 4TH STIFFNER ABOVE CHEM MILL VISUAL CRACK INDICATION. REF BY PEMCO NR.12738.0667. REPAIRED L/H HORIZ STABILIZER IN SPAR RIB 101.9 4TH STIFFENER FR OM L/E IAW B737 SRM 55-10-09-2R-4.COMPLETED BY P112, INSP BY Q94 5, ENTERED BY V928371. APPROVAL BY Q9
- [SDR CALA2022071501761](https://openairdocs.org/sdr/CALA2022071501761.md): Extinguisher · dislodged · Jul 15, 2022 · N77520 · Boeing 737824 · Fire Protection System
  > FIRE EXT FELL OFF MOUNT ONTO MAN GEAR EXT DOOR. GEAR WOULDNT RETRACT RESET DOOR GEAR OPS NORM UPDATED MAA CODE FIX USING VENDOR MAA SCREEN UPDATED MAA CODE FIX USING VENDOR MAA SCREEN MAC METER INITIATED FOR WITH VENDOR ID V900892 PLEASE CONTACT TOMC BEFOR
- [SDR CALA2021090801533](https://openairdocs.org/sdr/CALA2021090801533.md): Light · damaged · Sep 8, 2021 · N77520 · Boeing 737824 · Emergency Lighting
  > EMERGENCY LIGHTING SYSTEM OPERATIONAL CHECK {B737-33-3-0235} - AFT EMERGENCY LIGHT ON SEAT 4B DAMAGED AND INOP. RE-LAMPED EMERGENCY LIGHT REF MM 33-51-11. INSTALLED NEW WHITE LENS REF CONFIG DWG 3350DD14743. OPS CK OK.
- [SDR CALA2021082501427](https://openairdocs.org/sdr/CALA2021082501427.md): Motor · failed · Aug 24, 2021 · N77520 · Boeing 737824 · Trailing Edge Flap Control System
  > CREW REPORTED THAT ON APPROACH, FLAPS REMAINED AT 5 EVEN THOUGH 25 SELECTED. ALT FLAPS SELECTED TO ARM AND FLAPS DOWN SWITCH HELD BUT FLAPS STILL REMAINED AT 5. AIRCRAFT LANDED AT 73 KIAS.. ACP FSEU BITE CHECK. NO EXSITING FAULT. FAULT HISTORY ONLY SHOWED FAUL
- [SDR CALA2021082301408](https://openairdocs.org/sdr/CALA2021082301408.md): Oil System · leaking · Aug 23, 2021 · N77520 · Boeing 737824 · Turbine Engine Oil System
  > ENGINE OIL QUANTITY INDICATION LOW ENGINE 2 DROPPED TO 0 RAN ENGINE PART POWER AND FOUND OIL QUANTITY DROPPED FROM 100 TO 57. MECHANICS ON GROUND SAW SPARKS FROM THE ENGINE AND OIL LEAK ING FROM THE EXHAUST SECTION. REPLACED #2 ENGINE PER TASK CARD 58-7200-9-0
- [SDR CALA2021082301400](https://openairdocs.org/sdr/CALA2021082301400.md): Oil System · low pressure · Aug 20, 2021 · N77520 · Boeing 737824 · Engine Oil Pressure
  > ENGINE OIL PRESSURE INDICATION LOW OR ZERO (RED) ENGINE 2
- [SDR CALA2018021600657](https://openairdocs.org/sdr/CALA2018021600657.md): Lens · missing · Feb 16, 2018 · N77520 · Boeing 737824 · Emergency Lighting
  > EMERGENCY EXIT LIGHT LEFT OF FIRST CLASS CLOSET MISSING THE LENS. REPLACED THE LENS, AND OPS CHECKED GOOD.
- [SDR CALA2017101503635](https://openairdocs.org/sdr/CALA2017101503635.md): Light · inoperative · Oct 15, 2017 · N77520 · Boeing 737824 · Emergency Lighting
  > FORWARD SEAT EMERGENCY LIGHT INOPERATIVE AT 20C. REPLACED FORWARD THE LENS. OPS CHECKED NORMAL.
- [SDR CALA2017101503634](https://openairdocs.org/sdr/CALA2017101503634.md): Light · inoperative · Oct 15, 2017 · N77520 · Boeing 737824 · Emergency Lighting
  > EMERGENCY EXIT SEAT LIGHT INOPERATIVE AT 12C. REPLACED THE LENS. OPS CHECKED NORMAL.
- [SDR CALA2016111400916](https://openairdocs.org/sdr/CALA2016111400916.md): Socket · unserviceable · Nov 14, 2016 · N77520 · Boeing 737824 · Emergency Lighting
  > EMERGENCY EXIT AREA LIGHTS ABOVE SEATS 24C 27C 29C AND 32C INOP. REPLACED SOCKETS AT 27ABC AND 32ABC. REPLACED FUSES FOR 24-32ABC. EMERGENCY LIGHTS OPS CHECKS GOOD. REF WDM 33-51-13 AND 33-51-14
- [SDR CALA2016092300679](https://openairdocs.org/sdr/CALA2016092300679.md): Charger · unserviceable · Sep 23, 2016 · N77520 · Boeing 737824 · Emergency Lighting
  > FOUND EMERGENCY LIGHTS IN AFT CABIN NOT WORKING. REPLACED CHARGER AND BATTERY PACK NR 1673 IN AFT GALLEY. OPS CHECK GOOD.
- [SDR CALA2016082200552](https://openairdocs.org/sdr/CALA2016082200552.md): Skin · cracked · Aug 19, 2016 · N77520 · Boeing 737824 · Horizontal Stabilizer, Plate/Skin
  > CRACK FOUND AT RIGHT HORIZONTAL STABILIZER LOWER SKIN APPROXIMATELY 1" LONG LOCATED AT STA 101.90 12" FORWARD OF THE T/E, INBD OF FASTENER INBD ROW. REPAIRED CRACK RT HORIZONTAL STABILIZER STA 101.90 12" AND 18" FWD OF T/E IAW SRM 55-10-01, REPAIR 11, FIGURE
- [SDR CALA2016082200551](https://openairdocs.org/sdr/CALA2016082200551.md): Skin · cracked · Aug 19, 2016 · N77520 · Boeing 737824 · Horizontal Stabilizer, Plate/Skin
  > CRACK FOUND RT HORIZONTAL STABILIZER LOWER SKIN APPROXIMATELY 1" LONG AT STA 138.70, 9.5" FWD OF T/E INBD OF FASTENER, INBD ROW. REPAIRED CRACK RT STABILIZER LOWER SKIN STA 138.7 9.5" FWD OF T/E IAW SRM 55-10-01, REPAIR 11, FIG 204, CAT B REPAIR INSPECTION TH
- [SDR CALA2016082200550](https://openairdocs.org/sdr/CALA2016082200550.md): Skin · cracked · Aug 19, 2016 · N77520 · Boeing 737824 · Horizontal Stabilizer, Plate/Skin
  > CRACK FOUND LT HORIZONTAL STABILIZER LOWER SKIN APPROXIMATELY 1" LONG LOCATED STA 138-70, 18" FORWARD OF T/E, INBD OF FASTENER INBD ROW. REPAIRED CRACKED LT HORIZONTAL STABILIZER LOWER SKIN STA 138.7, 18" FORWARD OF T/E IAW SRM 55-10-01, REPAIR 11, FIG 204, C
- [SDR CALA2015041600290](https://openairdocs.org/sdr/CALA2015041600290.md): Engine · failed · Apr 16, 2015 · N77520 · Boeing 737824 · Engine (Turbine/Turboprop)
  > CLIMBING THROUGH 11,000 FEET, NR 1 ENG FAILED. ENG SEIZED NO ROTATION. R & R NR 1 ENG POWER PLANT IAW AMM 71-00-02 PAGE 401. LEAK CHECK OPERATIONS, CHECKED GOOD, ACFT TO CONTINUE. ROTABLE PARTS CHANGE WAS INDICATED, TT 1578761, SN OFF 02827. FAULT DATA FA
- [SDR CALA2014101501347](https://openairdocs.org/sdr/CALA2014101501347.md): Transmitter · faulty · Oct 14, 2014 · N77520 · Boeing 737824 · Trailing Flap Position Indicating System
  > FLAP DISAGREE WHEN FLAPS SET FOR LANDING. FLAPS STOPPED BETWEEN 2 & 5. RAN CHECKLIST & USED ALTERNATE FLAPS SWITCH TO LOWER FLAPS 15. REPLACED LT FLAP POSITION TRANSMITTER T427 IAW AMM 27-58-01-4 00-801 & ADJUST TEST AMM 27-58-01-820-801. RII INSP 10Y70. R

## 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 = 'N77520' AND registry_match = 'registration'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/aircraft/N77520/reports

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