# Service difficulty reports: N991NN A list on [N991NN](https://openairdocs.org/aircraft/N991NN.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. - [SDR AALA202610217261](https://openairdocs.org/sdr/AALA202610217261.md): Heatshrink · broken · Oct 20, 2026 · N991NN · Boeing 737823 · Emergency Equipment > AIRCRAFT WAS NOT GROUNDED: FORWARD SERVICE DOOR GIRT BAR RED NOTIFICATION PEALING OFF ON THE LEFT SIDE. REMOVED AND REPLACED FWD R1 DOOR GIRT BAR RED HEAT SHRINK ON LH SIDE AS REQUESTED. AARD 25-66-00-4. - [SDR AALA202607137364](https://openairdocs.org/sdr/AALA202607137364.md): Sliding Window · jammed · Jul 12, 2026 · N991NN · Boeing 737823 · Flight Compartment Windows > AIRCRAFT WAS NOT GROUNDED: FO EGRESS WINDOW WILL NOT OPEN. MAINTENANCE FOUND SCREW DISLODGED,,RESECURED SCREW AS REQUIRED. - [SDR AALA202510164129](https://openairdocs.org/sdr/AALA202510164129.md): Light · dislodged · Oct 14, 2025 · N991NN · Boeing 737823 · Emergency Lighting > AIRCRAFT WAS GROUNDED: EMERGENCY LIGHT AT 15C FELL OUT AND THE WIRE IS STICKING OUT INTO THE ISLE. REMOVED AND REPLACED 15C EMERGENCY LIGHT ON END BAY. PER CMM 25-23-67. OPERATIONAL CHECK GOOD. - [SDR AALA202509204956](https://openairdocs.org/sdr/AALA202509204956.md): Slide · dislodged · Sep 17, 2025 · N991NN · Boeing 737823 · Escape Slide > AIRCRAFT WAS GROUNDED: AFTER PARKING, WHILE THEY WERE OPENING THE FORWARD ENTRY DOOR, THE CASING FOR THE EMERGENCY EXIT SLIDE CRACKED OPEN AND WEDGED THE SLIDE AND THE GIRT BAR ON THE GALLEY FLOOR, CAUSING THE DOOR TO BE STUCK ABOUT A QUARTER OPEN. REMOVED AND - [SDR AALA202509172714](https://openairdocs.org/sdr/AALA202509172714.md): Door Latch · lack of lube · Sep 16, 2025 · N991NN · Boeing 737823 · Fixed Inner Doors > AIRCRAFT WAS NOT GROUNDED: LAVATORY-D DOOR ON AFT LEFT SIDE. THE LOCKING MECHANISM IS DIFFICULT TO OPERATE AND IS LOCKING PEOPLE IN THE LAVATORY. CLEANED AND LUBED LATCH AT LAVATORY-D DOOR. OPERTIONAL CHECK GOOD. PER AMM 25-40-14. - [SDR AALA202506304348](https://openairdocs.org/sdr/AALA202506304348.md): Processor · inaccurate · Jun 27, 2025 · N991NN · Boeing 737823 · Fuel Indicating System > AIRCRAFT WAS GROUNDED: ON TAKEOFF, WITH 2200LBS IN CENTER TANK, WE NOTICED THE CENTER FUEL QUANTITY RAPIDLY DECREASING AS WE PASSED BY 7,000FT, CENTER TANK RAPIDLY FELL TO 0.0 LBS INDICATED. WE RECEIVED A FMS MESSAGE 'VERIFY GROSS WEIGHT AND FUEL' - WITH NO WA - [SDR AALA202506304331](https://openairdocs.org/sdr/AALA202506304331.md): Float Switch · inaccurate · Jun 27, 2025 · N991NN · Boeing 737823 · Fuel Indicating System > AIRCRAFT WAS GROUNDED: ON TAKEOFF, WITH 2200LBS IN CENTER TANK, WE NOTICED THE CENTER FUEL QUANTITY RAPIDLY DECREASING AS WE PASSED BY 7,000FT, CENTER TANK RAPIDLY FELL TO 0.0 LBS INDICATED. WE RECEIVED A FMS MESSAGE 'VERIFY GROSS WEIGHT AND FUEL' - WITH NO WA - [SDR AALA202506307238](https://openairdocs.org/sdr/AALA202506307238.md): Compensator · fault message · Jun 27, 2025 · N991NN · Boeing 737823 · Aircraft Fuel Distribution System > AIRCRAFT WAS GROUNDED: ON TAKEOFF, WITH 2200LBS IN CENTER TANK, WE NOTICED THE CENTER FUEL QUANTITY RAPIDLY DECREASING AS WE PASSED BY 7,000FT, CENTER TANK RAPIDLY FELL TO 0.0 LBS INDICATED. WE RECEIVED A FMS MESSAGE 'VERIFY GROSS WEIGHT AND FUEL' - WITH NO WA - [SDR AALA202506306150](https://openairdocs.org/sdr/AALA202506306150.md): Probe · fault message · Jun 27, 2025 · N991NN · Boeing 737823 · Aircraft Fuel Distribution System > AIRCRAFT WAS GROUNDED: ON TAKEOFF, WITH 2200LBS IN CENTER TANK, WE NOTICED THE CENTER FUEL QUANTITY RAPIDLY DECREASING AS WE PASSED BY 7,000FT, CENTER TANK RAPIDLY FELL TO 0.0 LBS INDICATED. WE RECEIVED A FMS MESSAGE 'VERIFY GROSS WEIGHT AND FUEL' - WITH NO WA - [SDR AALA202506302917](https://openairdocs.org/sdr/AALA202506302917.md): Probe · fault message · Jun 27, 2025 · N991NN · Boeing 737823 · Aircraft Fuel Distribution System > AIRCRAFT WAS GROUNDED: ON TAKEOFF, WITH 2200LBS IN CENTER TANK, WE NOTICED THE CENTER FUEL QUANTITY RAPIDLY DECREASING AS WE PASSED BY 7,000FT, CENTER TANK RAPIDLY FELL TO 0.0 LBS INDICATED. WE RECEIVED A FMS MESSAGE 'VERIFY GROSS WEIGHT AND FUEL' - WITH NO WA - [SDR AALA202408307534](https://openairdocs.org/sdr/AALA202408307534.md): Anti-Skid Sys · faulty · Aug 28, 2024 · N991NN · Boeing 737823 · Brake Anti-Skid Section > AIRCRAFT WAS NOT GROUNDED: ON LANDING AUTO BRAKES DID NOT FUNCTION. AUTO BRAKE DISARM LIGHT ILLUMINATED IMMEDIATELY. REMOVED AND REPLACED ANTI-SKID AUTO BRAKE CONTROL UNIT. PER AMM 32-42-21. - [SDR AALA202406255388](https://openairdocs.org/sdr/AALA202406255388.md): Tire · failed · Jun 23, 2024 · N991NN · Boeing 737823 · Tire > AIRCRAFT WAS GROUNDED: RIGHT OUTBOARD TIRE BLEW WHILE EXITING RUNWAY. CAPTAIN FELT RESISTANCE AT TAXI SPEED AS IF BRAKES WERE APPLIED ON THE RIGHT SIDE. A FEW SECONDS LATER THERE WAS A POP THAT WAS THOUGHT TO BE THE ANTI-SKID RELEASING. PILOTS COMMENTED THAT I - [SDR AALA202406252909](https://openairdocs.org/sdr/AALA202406252909.md): Brake Assy · seized · Jun 23, 2024 · N991NN · Boeing 737823 · Landing Gear Brake System > AIRCRAFT WAS GROUNDED: RIGHT OUTBOARD TIRE BLEW WHILE EXITING RUNWAY. CAPTAIN FELT RESISTANCE AT TAXI SPEED AS IF BRAKES WERE APPLIED ON THE RIGHT SIDE. A FEW SECONDS LATER THERE WAS A POP THAT WAS THOUGHT TO BE THE ANTI-SKID RELEASING. PILOTS COMMENTED THAT I - [SDR AALA202404242946](https://openairdocs.org/sdr/AALA202404242946.md): Bulb · inoperative · Apr 23, 2024 · N991NN · Boeing 737823 · Emergency Lighting > AIRCRAFT IN BASE MAINTENANCE: L2 EMERGENCY LIGHT INOPERATIVE. REMOVE AND REPLACED BULB. PER B737NG AMM 33-51-04. - [SDR AALA202404308860](https://openairdocs.org/sdr/AALA202404308860.md): Skin · delaminated · Apr 18, 2024 · N991NN · Boeing 737823 · Trailing Edge Flaps > AIRCRAFT IN BASE MAINTENANCE: RIGHT WING OUTBOARD FLAP LOWER SURFACE IS DELAMINATED. REPLACED RIGHT WING OUTBOARD AFT FLAP PER AMM 27-61-22. - [SDR AALA202403156478](https://openairdocs.org/sdr/AALA202403156478.md): Tube · damaged · Mar 11, 2024 · N991NN · Boeing 737823 · Emergency Equipment > AIRCRAFT WAS NOT GROUNDED: R2 SLIDE GIRT BAR REQUIRES HEAT SHRINK REPLACEMENT. PER AARD 24-66-00-4. **SUPPLEMENTAL REPORT FOR (AALA202403126478): REPLACED HEAT SHRINK ON R2 SLIDE GIRT BAR. PER AARD 24-66-00-4 **(CLOSED). - [SDR AALA202403126478](https://openairdocs.org/sdr/AALA202403126478.md): Tube · missing · Mar 11, 2024 · N991NN · Boeing 737823 · Emergency Equipment > AIRCRAFT WAS NOT GROUNDED: R2 SLIDE GIRT BAR REQUIRES HEAT SHRINK REPLACEMENT. PER AARD 24-66-00-4. **SUPPLEMENTAL REPORT WILL BE SUBMITTED**(OPEN). - [SDR AALA202401227670](https://openairdocs.org/sdr/AALA202401227670.md): Door · out of rig · Jan 17, 2024 · N991NN · Boeing 737823 · Passenger/Crew Doors > AIRCRAFT WAS GROUNDED: FORWARD ENTRY DOOR LIGHT ILLUMINATED ON TOUCHDOWN FLIGHT ATTENDANT STATES HANDLE HAD RAISED UP DURING DESCENT.**SUPPLEMENTAL REPORT FOR (AALA202401187670): PARTIAL WORK ACCOMPLISHED ACCOMPLISHED RIGGED DOOR. PER WORK CARD 08C83152006**(C - [SDR AALA202401187670](https://openairdocs.org/sdr/AALA202401187670.md): Door · faulted · Jan 17, 2024 · N991NN · Boeing 737823 · Passenger/Crew Doors > AIRCRAFT WAS GROUNDED: FORWARD ENTRY DOOR LIGHT ILLUMINATED ON TOUCHDOWN FLIGHT ATTENDANT STATES HANDLE HAD RAISED UP DURING DESCENT.**SUPPLEMENTAL REPORT WILL BE SUBMITTED**(OPEN). - [SDR AALA202306132922](https://openairdocs.org/sdr/AALA202306132922.md): Oven · odor · Jun 12, 2023 · N991NN · Boeing 737823 · Buffet/Galleys > AIRCRAFT WAS GROUNDED: DURING DESCENT, BURNING SMELL. IN COCKPIT AND CABIN. MAINTENANCE FOUND FOOD DEBRIS IN FORWARD GALLEY LEFT HAND OVEN. CLEANED AND RAN OVEN. NO DEFECTS OR SMELL NOTED. - [SDR AALA202302246537](https://openairdocs.org/sdr/AALA202302246537.md): Door · none · Feb 22, 2023 · N991NN · Boeing 737823 · Passenger/Crew Doors > AIRCRAFT WAS GROUNDED: FORWARD CABIN ENTRY DOOR L1 HANDLE MOVED TOWARD THE OPEN POSITION DURING TAXI IN. 60KT LIGHT "FWD ENTRY" IN COCKPIT. ACCOMPLISHED FORWARD DOOR CHECK AND ADJUSTMENT FOR SOFT UNLATCHING PER JOB CARD. - [SDR AALA202302201111](https://openairdocs.org/sdr/AALA202302201111.md): Oven · odor · Feb 17, 2023 · N991NN · Boeing 737823 · Buffet/Galleys > AIRCRAFT WAS NOT GROUNDED: GALLEY OVEN #1 IN FIRST CLASS EMITTING A BURNING ODOR. REMOVED AND REPLACED GALLEY OVEN #1 PER AMM 25-32-03. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK. - [SDR AALA202204041356](https://openairdocs.org/sdr/AALA202204041356.md): Bracket · loose · Apr 1, 2022 · N991NN · Boeing 737 · Emergency Equipment > AIRCRAFT WAS NOT GROUNDED: 1L GIRT BAR BRACKET LOOSE. RE TIGHTENED BRACKET AT 1L DOOR GIRT BAR PER AMM 25-61-00. - [SDR AALA202201319527](https://openairdocs.org/sdr/AALA202201319527.md): Hook · out of adjust · Jan 30, 2022 · N991NN · Boeing 737* · Emergency Equipment > AIRCRAFT WAS NOT GROUNDED: DOOR 1R GIRT BAR STUCK. ADJUSTED 1R GIRT BAR HOOKS. - [SDR AALA202201068229](https://openairdocs.org/sdr/AALA202201068229.md): Housing · broken · Jan 3, 2022 · N991NN · Boeing 737823 · Emergency Lighting > AIRCRAFT WAS NOT GROUNDED: EMERGENCY LIGHT TRIM BROKEN AT SEAT 12C. REPLACED HOUSING WITH NEW IAW AMM 33-51-11, OPS CHECK GOOD. - [SDR AALA202112221519](https://openairdocs.org/sdr/AALA202112221519.md): Slide · inoperative · Dec 20, 2021 · N991NN · Boeing 737* · Escape Slide > AIRCRAFT WAS NOT GROUNDED: AFT RIGHT SLIDE IS PARTIALLY EXPOSED AT BOTTOM OF ENCLOSURE. ADJUSTED BOTTOM PORTION OF AFT RIGHT SLIDE PACK PER AMM 25-66-00. - [SDR AALA202112134383](https://openairdocs.org/sdr/AALA202112134383.md): Light · loose · Dec 12, 2021 · N991NN · Boeing 737* · Emergency Lighting > AIRCRAFT WAS NOT GROUNDED: PASSENGER SEAT AT 16C ESCAPE PATH LIGHT LOOSE. SECURED 16C ESCAPE PATH LIGHT PER AMM 33-51-00. - [SDR AALA202111196995](https://openairdocs.org/sdr/AALA202111196995.md): Light · detached · Nov 17, 2021 · N991NN · Boeing 737* · Emergency Lighting > AIRCRAFT WAS NOT GROUNDED: EXIT ROW LIGHT HANGING LOOSE AT SEAT 16ABC. REINSTALLED ROW 16ABC EXIT ROW LIGHT IAW CMM 25-23-67, OPS CHECK GOOD. - [SDR AALA202107263698](https://openairdocs.org/sdr/AALA202107263698.md): Cover · dislodged · Jul 25, 2021 · N991NN · Boeing 737823 · Emergency Lighting > AIRCRAFT WAS NOT GROUNDED: SEAT 16C EMERGENCY EXIT LIGHT COVER DETACHED. RESECURED PER AMM 33-51-11. - [SDR AALA202102269019](https://openairdocs.org/sdr/AALA202102269019.md): Window · cracked · Feb 23, 2021 · N991NN · Boeing 737823 · Flight Compartment Windows > AIRCRAFT WAS GROUNDED: R1 WINDOW OUTER PANE CRACKED IN CRUISE AT FL250. REPLACED R1 WINDOW WITH SERVICEABLE UNIT IAW WORKCARD 08L21056004. - [SDR AALA202010109015](https://openairdocs.org/sdr/AALA202010109015.md): Smoke Detector · false indication · Oct 9, 2020 · N991NN · Boeing 737823 · Smoke Detection > AIRCRAFT WAS NOT GROUNDED. AFT RIGHT LAVATORY SMOKE DETECTOR WENT OFF FOR APPROXIMATELY ONE MINUTE AT CRUISE. NO SMOKE, ODOR, OR HEAT SEEN OR FELT. SYSTEM RESET ITSELF NO FUTHER TROUBLE. SYSTEM CHECKS GOOD, PER AMM 26-14-00-501. - [SDR AALA202006289006](https://openairdocs.org/sdr/AALA202006289006.md): Battery Pack · missing · Jun 27, 2020 · N991NN · Boeing 737823 · Emergency Lighting > AIRCRAFT WAS NOT GROUNDED BUT WAS IN SHORT TERM STORAGE: FOUND LEFT HAND EMERGENCY BATTERY UNDER AFT SIDE PANEL TO BE MISSING. INSTALLED BATTERY AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-06. - [SDR AALA201902049028](https://openairdocs.org/sdr/AALA201902049028.md): Contact · broken · Feb 2, 2019 · N991NN · Boeing 737823 · Emergency Lighting > ON INSPECTION OF THE EMERGENCY LIGHTS, FOUND THE EXIT SIGN AT THE L2 DOOR HAD FAILED TO ILLUMINATE. FOUND A BROKEN CONTACT AT CONNECTOR D10084. TERMINATED A NEW CONTACT IAW SWPM 20-30-12. OPS TESTED GOOD. - [SDR AALA201802289028](https://openairdocs.org/sdr/AALA201802289028.md): Wire Harness · defective · Feb 25, 2018 · N991NN · Boeing 737823 · Light System Wiring > EMERGENCY LIGHT ON SEAT 16D-20D IS INOPERATIVE. REMOVED AND REPLACED NUMBER 4 BATTERY PACK PER AMM 33-51-06. OPERATIONS CHECK GOOD (SEE SDR AALA201802279035). ALSO REMOVED AND REPLACED HARNESS ON SEAT 16F TO RECEPTACAL D12836 PER ESO60882. THE AIRCRAFT WAS GR - [SDR AALA201802279035](https://openairdocs.org/sdr/AALA201802279035.md): Battery Pack · inoperative · Feb 25, 2018 · N991NN · Boeing 737823 · Emergency Lighting > EMERGENCY LIGHT ON SEAT 16D-20D IS INOPERATIVE. REMOVED AND REPLACED NUMBER 4 BATTERY PACK PER AMM 33-51-06. OPERATIONS CHECK GOOD. ALSO REMOVED AND REPLACED HARNESS ON SEAT 16F TO RECEPTACAL D12836 IAW ESO60882 THE AIRCRAFT WAS GROUNDED. - [SDR AALA201711069051](https://openairdocs.org/sdr/AALA201711069051.md): Lens · missing · Nov 4, 2017 · N991NN · Boeing 737823 · Emergency Lighting > AIRCRAFT WAS NOT GROUNDED. SEAT MOUNTED AFT WHITE EMERGENCY ESCAPE LIGHT AT SEAT 15D HAS A MISSING LENS COVER. INSTALLED LENS COVER PER AMM 33-51-11. OPERATIONAL CHECK GOOD. - [SDR AALA20170728009](https://openairdocs.org/sdr/AALA20170728009.md): Brake · seized · Jul 28, 2017 · N991NN · Boeing 737823 · Brake > THE AIRCRAFT WAS GROUNDED. NUMBER 4 TIRE BLEW ON LANDING. THE FLIGHT CLEARED THE RUNWAY AND TURNED ONTO TAXI WAY Q WHERE IT STOPPED. ARFF RESPONDED, AND INVESTIGATED FOR A POTENTIAL FIRE, BUT NO ACTION WAS REQUIRED. THE PASSENGERS WERE DEPLANED AND BUSSED - [SDR AALA201707119016](https://openairdocs.org/sdr/AALA201707119016.md): Retaining Clip · dirty · Jul 9, 2017 · N991NN · Boeing 737823 · Emergency Equipment > AIRCRAFT WAS NOT GROUNDED. R1 DOOR GIRT BAR IS DIFFICULT TO ARM AND DISARM. CLEANED DEBRIS FROM GIRT BAR RETAINER CLIPS. OPERATIONAL CHECK PER AMM 25-66-01 GOOD. - [SDR AALA20170522011](https://openairdocs.org/sdr/AALA20170522011.md): Transceiver · failed · May 22, 2017 · N991NN · Boeing 737823 · Weather Radar System > WEATHER RADAR FAILED DURING CLIMBOUT. CREW DECLARED AN EMERGENCY AND RETURNED TO DFW, LANDED OVERWEIGHT WITHOUT INCIDENT. MAINTENANCE REPLACED WEATHER TRANSCEIVER PER MM 34-43-41. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK. AIRCRAFT WAS GROUNDED. - [SDR AALA201704249023](https://openairdocs.org/sdr/AALA201704249023.md): Gcu · faulty · Apr 22, 2017 · N991NN · Boeing 737823 · AC Generator-Alternator > AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. FLIGHT DIVERTED DUE TO A RIGHT MAIN ELECTRICAL BUSS FAILURE. LANDING UNEVENTFUL. REMOVED AND REPLACED GENERATOR CONTROL UNIT 1 IAW AMM 24-21-81. OPERATIONAL CHECK GOOD. - [SDR AALA201704199016](https://openairdocs.org/sdr/AALA201704199016.md): Light · broken · Apr 17, 2017 · N991NN · Boeing 737823 · Emergency Lighting > FOUND AFT RT FWD OF GALLEY EMERGENCY LT ASSY BROKEN. REPLACED EMERGENCY LT ASSY PER M/M 33-31-01, LT ASSY OPS TEST OK. THE AIRCRAFT WAS NOT GROUNDED. - [SDR AALA20170206010](https://openairdocs.org/sdr/AALA20170206010.md): Lens · broken · Feb 3, 2017 · N991NN · Boeing 737823 · Emergency Lighting > FLOOR PROXIMITY EMERGENCY EXIT LIGHT BETWEEN FIRST CLASS AND THE FORWARD GALLEY HAS A BROKEN LENS COVER. REPLACED LENS COVER IAW AMM 33-51-00. OPERATIONAL CHECK GOOD. ## 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 = 'N991NN' AND registry_match = 'registration' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/aircraft/N991NN/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.