# Service difficulty reports: N421MQ, cancelled Jun 11, 1998 A list on [N421MQ, cancelled Jun 11, 1998](https://openairdocs.org/deregistered/N421MQ-1998-06-11.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. - [SDR SIMA973421](https://openairdocs.org/sdr/SIMA973421.md): Resistor · failed · Dec 8, 1997 · N421MQ · Aerosp ATR42300 · Emergency Lighting > ORD - FLT 4366 - SIX FLOOR EMERGENCY LIGHTS OUT. RAI BURNED RESISTOR ON EMERGENCY POWER SUPPLY ON 29WL, OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (M) - [SDR SIMA9701903](https://openairdocs.org/sdr/SIMA9701903.md): Fuses · blown · Jul 9, 1997 · N421MQ · Aerosp ATR42300 · Emergency Lighting > ORD - FLT 4082 - THREE EMERGENCY EXIT FLOOR PROXIMITY LIGHTS IN REAR OF CABIN ARE INOPERABLE. MEL 33-22 CAT C AUTH NR 070122. MEL'D SYSTEM PER 33-22, AND RETURNED AIRCRAFT TO SERVICE. 7-13-97 - FOUND THREE FUSES IN THE EMERGENCY LIGHT POWER SUPPLY AT 30WL B - [SDR SIMA971591](https://openairdocs.org/sdr/SIMA971591.md): Battery · discharged · Jun 8, 1997 · N421MQ · Aerosp ATR42300 · Emergency Lighting > ORD - FLT 4088 - FORWARD LOWER EMERGENCY EXIT LIGHT INOP. REPLACED BATTERY FOR EMERGENCY LIGHT AT SEAT 1AB (3WL) PERFORMED OPS CHECK. AIRCRAFT WAS RETURN TO SERVICE. (M) - [SDR SIMA9701521](https://openairdocs.org/sdr/SIMA9701521.md): Bulb · failed · Jun 1, 1997 · N421MQ · Aerosp ATR42300 · Emergency Lighting > ORD - FLT 4389 - TWO LIGHT BULBS THE THIRD FROM THE LAST AND THE LAST EMERGENCY FLOOR LIGHT STRIP INOP. ENTERED INTO MEL. AIRCRAFT RETURNED TO SERVICE. MEL WAS CLEARED BY REPLACING THE BULB. PERFORMED EMERGENCY LIGHT CHECK WITH NO DISCREPANCIES NOTED. AIR - [SDR SIMA971251](https://openairdocs.org/sdr/SIMA971251.md): Bearing · seized · May 5, 1997 · N421MQ · Aerosp ATR42300 · Wheel/Ski/Float > ORD - FLT 4304 - AFTER LANDING, THE CREW NOTED THAT THE HOT BRAKE WARNING LIGHT ILLUMINATED, THE AIRCRAFT WAS STOPPED TO INVESTIGATE AND FOUND THAT THE NR 1 MAIN TIRE WAS BLOWN AND NR 1 BRAKE WAS SMOKING AND HYDRAULIC FLUID WAS LEAKING FROM THE LINES. INSPECT - [SDR SIMA9700161](https://openairdocs.org/sdr/SIMA9700161.md): Landing Light · failed · Jan 16, 1997 · N421MQ · Aerosp ATR42300 · Exterior Lighting > ORD - FLT 4162 - ON SHORT FINAL FOR LANDING IN ORD, THE RIGHT LANDING LIGHT CB TRIPPED FOLLOWED BY NOISE OF RELAY, CHATTERING AND A HOT ELECTRICAL ODOR IN THE COCKPIT. MAINTENANCE PERFORMED GROUND RUNS ON THE AIRCRAFT AND COULD NOT DUPLICATE THE HOT ELECTRICA - [SDR SIMA960942](https://openairdocs.org/sdr/SIMA960942.md): Landing Gear · failed · Apr 3, 1996 · N421MQ · Aerosp ATR42300 · Main Landing Gear > TVC - FLT 4245 - AFTER LANDING AT TVC, DURING ROLL OUT TO TAXI WAY, AIRCRAFT LT MLG FAILED. CREW COMPLIED WITH ENGINE SHUTDOWN AND EMERGENCY EVACUATION OF PASSENGERS. INVESTIGATION SHOWED THAT THE MLG LANDING GEAR SEPARATED AT THE SWIVEL POINT BETWEEN LEG AS - [SDR SIMA960631](https://openairdocs.org/sdr/SIMA960631.md): Wire · broken · Mar 3, 1996 · N421MQ · Aerosp ATR42300 · Light System Wiring > ORD - FLT 4164 - WIRE FOR ENTRANCE EMERGENCY LIGHT BROKEN BY PASSENGER. MAINTENANCE REPAIRED BROKEN WIRE. AIRCRAFT RETURNED TO SERVICE. (X) - [SDR SIMA960332](https://openairdocs.org/sdr/SIMA960332.md): Battery Pack · discharged · Feb 2, 1996 · N421MQ · Aerosp ATR42300 · Emergency Lighting > CMI - EMERGENCY LIGHTS FOR BATTERY PACK POSITION 10WL INOPERATIVE AND EMERGENCY LIGHTS AT POSITION 3WL WILL NOT GO OUT. RAI'D BATTERY PACKS AT 10WL AND 3WL. AIRCRAFT WAS RETURNED TO SERVICE. (M) - [SDR 96ZZZM257](https://openairdocs.org/sdr/96ZZZM257.md): Battery Pack · discharged · Feb 2, 1996 · N421MQ · Aerosp ATR42300 · Emergency Lighting > CMI - EMERGENCY LIGHTS FOR BATTERY PACK POSITION 10WL INOPERATIVE AND EMERGENCY LIGHTS AT POSITION 3WL WILL NOT GO OUT. RAI'D BATTERY PACKS AT 10WL AND 3WL. AIRCRAFT WAS RETURNED TO SERVICE. REFERENCE SIMA960332. - [SDR SIMA953271](https://openairdocs.org/sdr/SIMA953271.md): Bell Crank Assy · worn bearing · Nov 23, 1995 · N421MQ · Aerosp ATR42300 · Aileron Control System > ORD - DURING ACCOMPLISHMENT OF EO E9-2700-001 INSP OF AILERON CONTROL SYS, FOUND PENDULAR LEVER ASSY AT LT WING RIB STA NRS 16, 14, 13, AND 8, RT WING RIB STA NR 21 FAILED TOLERANCE REQUIREMENTS. RT WING BELL CRANK ASSY AT RIB STA NR 27 HAS EXCESSIVE MOVEMENT - [SDR 95ZZZX6625](https://openairdocs.org/sdr/95ZZZX6625.md): Crank Assy · worn bearing · Nov 23, 1995 · N421MQ · Aerosp ATR42300 · Aileron Control System > ORD - DURING ACCOMPLISHMENT OF EO E9-2700-001 INSP OF AILERON CONTROL SYS, FOUND PENDULAR LEVER ASSY AT LT WING RIB STA NRS 16, 14, 13, AND 8, RT WING RIB STA NR 21 FAILED TOLERANCE REQUIREMENTS. RT WING BELL CRANK ASSY AT RIB STA NR 27 HAS EXCESSIVE MOVEMENT - [SDR 95ZZZX6624](https://openairdocs.org/sdr/95ZZZX6624.md): Crank Assy · worn bearing · Nov 23, 1995 · N421MQ · Aerosp ATR42300 · Aileron Control System > ORD - DURING ACCOMPLISHMENT OF EO E9-2700-001 INSP OF AILERON CONTROL SYS, FOUND PENDULAR LEVER ASSY AT LT WING RIB STA NRS 16, 14, 13, AND 8, RT WING RIB STA NR 21 FAILED TOLERANCE REQUIREMENTS. RT WING BELL CRANK ASSY AT RIB STA NR 27 HAS EXCESSIVE MOVEMENT - [SDR 95ZZZX6623](https://openairdocs.org/sdr/95ZZZX6623.md): Rod Assy · bent · Nov 23, 1995 · N421MQ · Aerosp ATR42300 · Aileron Control System > ORD - DURING ACCOMPLISHMENT OF EO E9-2700-001 INSP OF AILERON CONTROL SYS, FOUND PENDULAR LEVER ASSY AT LT WING RIB STA NRS 16, 14, 13, AND 8, RT WING RIB STA NR 21 FAILED TOLERANCE REQUIREMENTS. RT WING BELL CRANK ASSY AT RIB STA NR 27 HAS EXCESSIVE MOVEMENT - [SDR SIMA952922](https://openairdocs.org/sdr/SIMA952922.md): Eel Power Supply · defective · Oct 19, 1995 · N421MQ · Aerosp ATR42300 · Emergency Lighting > CVG - FLT 4020 - EMERGENCY BATTERY SUPPLY WILL NOT POWER EMERGENCY EXIT LIGHTS OVER EXITS AND FLOOR LIGHTING. RAI BATTERY PACKS AT 3WL AND 18WL, S/N 2456 AND 2981. AIRCRAFT RETURNED TO SERVICE. (M) - [SDR SIMA950942](https://openairdocs.org/sdr/SIMA950942.md): Window Frame · cracked · Apr 4, 1995 · N421MQ · Aerosp ATR42300 · Fuselage Miscellaneous Structure > SAT - DURING A 24,000 CYCLE INSPECTION, EDDY CURRENT INSPECTION REVEALED A.25 INCH CRACK IN THE VERTICAL PLANE OF NODE 5 RIGHT WINDOW FRAME. MAINTENANCE BLENDED OUT THE CRACK IAW ATR DRAWING NR 11S53140122. AIRCRAFT WAS RETURNED TO SERVICE. (X) - [SDR SIMA950941](https://openairdocs.org/sdr/SIMA950941.md): Window Frame · cracked · Apr 4, 1995 · N421MQ · Aerosp ATR42300 · Fuselage Miscellaneous Structure > SAT - DURING A 24,000 CYCLE INSPECTION, EDDY CURRENT INSPECTION REVEALED A.25 INCH CRACK ON THE VERTICAL PLANE OF THE NODE 5 LEFT WINDOW FRAME. MAINTENANCE BLENDED THE CRACK IAW ATR DRAWING NR 11S53140122. THE AIRCRAFT RETURNED TO SERVICE. (X) ## 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 = 'N421MQ' AND deregistration_id = 'N421MQ-1998-06-11' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/deregistered/N421MQ-1998-06-11/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.