# Service difficulty reports: N494AS

A list on [N494AS](https://openairdocs.org/aircraft/N494AS.md).

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

Page 1 of 3 · 142 reports

- [SDR ASAA2026091168670](https://openairdocs.org/sdr/ASAA2026091168670.md): Converter · faulted · Sep 11, 2026 · N494AS · Boeing 737990ER · Air Conditioning System
  > DURING DEPT FLIGHT DECK ONLY HAD MILD OIL SMELL. WENT AWAY AT AROUND 5000'. AGAIN DESCENDING THROUGH APPROX 5000' STRONGER OIL SMELL IN FLIGHT DECK ONLY UNTIL ARRIVAL AT GATE. GROUNDED - YES. R & R LT OZONE CONVERTER REF AMM 21-73-01, R & R LT RECIRCULATION FA
- [SDR ASAA2026051266079](https://openairdocs.org/sdr/ASAA2026051266079.md): Handle · no discrepancy · May 12, 2026 · N494AS · Boeing 737990ER · Passenger/Crew Doors
  > THE "A" FLIGHT ATTENDANTS REPORTED THE L1 DOOR HANDLE FELT "LOOSE" + DID NOT SET PROPERLY WHEN THE DOOR WAS CLOSED PRIOR TO PUSH. GROUNDED - YES. OPENED AND CLOSED L-1 DOOR USING INTERIOR AND EXTERIOR DOOR HANDLE. DOOR OPENS AND CLOSED NORMALLY REF. AMM 52-11-
- [SDR ASAA2026030464793](https://openairdocs.org/sdr/ASAA2026030464793.md): Battery Pack · discharged · Mar 4, 2026 · N494AS · Boeing 737990ER · Emergency Lighting
  > EMERGENCY LIGHTS OUT ON THE FOLLOWING: R/H OVERWING EXIT, ROWS 8L, 11L, CABIN CEILING EXIT LIGHT. GROUNDED - YES. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY S/N 411270 AT ROW 7LH, OPS CHECK GOOD IAW B737-900 AMM 33-51-06-960-805.
- [SDR ASAA2026020964518](https://openairdocs.org/sdr/ASAA2026020964518.md): Intercostal · corroded · Feb 9, 2026 · N494AS · Boeing 737990ER · Fuselage, Equipment Attach Fittings
  > RIGHT AFT LAV MOUNT INTERCOSTAL IS CORRODED FOUND WHILE WORKING 947 FRAME CORROSION. GROUNDED - YES. LOCATED AND DRILLED NEW INTERCOASTAL IAW BOEING 737-900ER SRM 51-40-05-0G-0. REMOVAL ANED INSTALL MAINTENANCE PERFORMED ON AAR MIG-5 OK456722 W/O 1023835 2000
- [SDR ASAA2026020864519](https://openairdocs.org/sdr/ASAA2026020864519.md): Attach Angle · corroded · Feb 8, 2026 · N494AS · Boeing 737990ER · Fuselage Main, Attach Fittings
  > WEB & SHIELD ATTACH ANGLE FWD OF DOOR CUT OUT AFT PIT IS CORRODED. GROUNDED - YES. REMOVED CORROSION, MAX MAT LOSS.012 FOUND TO BE OUT OF LIMITS REMOVED AND REPLACED IAW B737-900ER SRM 53-60-15-1A-1, SRM 51-40-05, SRM 51-40-02W-.450" O-.050 R-.038;- 60" D
- [SDR ASAA2026020764720](https://openairdocs.org/sdr/ASAA2026020764720.md): Floorbeam · corroded · Feb 7, 2026 · N494AS · Boeing 737990ER · Fuselage Main, Floor Beam
  > RIGHT FRAME 947 HAS CORROSION UPPER SURFACE NEAR LAV MOUNT BRACKET. GROUNDED - YES. REPAIRED FLOORBEAM STA 947 IAW BOEING SRM 53-70-51-2R-5 REPAIR 5 & EA 900ER-53EA-29930 REV 00W=.850" O=.180 R=.108 L=.950" D=.072".
- [SDR ASAA2026020464382](https://openairdocs.org/sdr/ASAA2026020464382.md): Transition Panel · corroded · Feb 4, 2026 · N494AS · Boeing 737990ER · Fuselage Miscellaneous Structure
  > FWD PIT LH SIDEPLATE (TRANSITION PANEL) IS CORRODED MULTIPLE SPOTS FROM STA 500A-500L. GROUNDED - YES. REPAIRED TRANSITIONAL PANEL IAW B737-900ER SRM 53-00-53-1A-2 AND 53-00-53-2R-5W= 3.0" O=.040 R=.032 L= 1.5" D=.080.
- [SDR ASAA2026020364808](https://openairdocs.org/sdr/ASAA2026020364808.md): Transition Panel · corroded · Feb 3, 2026 · N494AS · Boeing 737990ER · Fuselage Miscellaneous Structure
  > AFT PIT LH SIDEPLATE (TRANSITION PANEL) IS CORRODED MULTIPLE SPOTS STA 727-807. GROUNDED - YES. REMOVED CORROSION, DUE TO 100% MAT LOSS, FOUND TO BE OUT OF LIMITS IAW B737-900ER SRM 53-00-53-1A-2 FABRICATED, LOCATED, DRILLED & INSTALLED NEW TRANSITION PANEL SI
- [SDR ASAA2026020364521](https://openairdocs.org/sdr/ASAA2026020364521.md): Shield · corroded · Feb 3, 2026 · N494AS · Boeing 737990ER · Fuselage Miscellaneous Structure
  > AFT DOOR CUT OUT, FWD RH SHIELD IS CORRODED. GROUNDED - YES. REMOVED CORROSION, MAX MAT LOSS.027, FOUND TO BE OUT OF LIMITS, REMOVED & REPLACED IAW B737-900ER SRM 53-60-15-1A-1, SRM 51-40-05 & SRM 51-40-02W= 1.5" O=.050 R=.027 L= 3.0" D=.023.
- [SDR ASAA2026020364520](https://openairdocs.org/sdr/ASAA2026020364520.md): Transition Panel · corroded · Feb 3, 2026 · N494AS · Boeing 737990ER · Fuselage Miscellaneous Structure
  > AFT CARGO RT SIDEPLATE (TRANSITION PANEL) IS CORRODED MULTIPLE SPOTS STA 727-787. GROUNDED - YES. REMOVED CORROSION, DUE TO 100% MAT LASS, FOUND TO BE OUT OF LIMITS IAW B737-900ER SRM 53-00-53-1A-2, FABRICATED, LOCATED, DRILLED & INSTALLED NEW TRANSITION PANEL
- [SDR ASAA2025101361550](https://openairdocs.org/sdr/ASAA2025101361550.md): Light · broken · Oct 13, 2025 · N494AS · Boeing 737990ER · Emergency Lighting
  > OVERWING LT FWD, INTERIOR EMERGENCY LIGHT ASSY BROKEN. GROUNDED - YES. REMOVED & REPLACED OVERWING LH FWD, INTERIOR EMERGENCY LIGHT ASSY REF AMM 33-51-01, OPS CKS GD.
- [SDR ASAA2025081960222](https://openairdocs.org/sdr/ASAA2025081960222.md): Elec Connector · damaged · Aug 19, 2025 · N494AS · Boeing 737990ER · Light System Wiring
  > WIRE HANGING FROM CEILING OF AFT CABIN. GROUNDED - YES. REVERSED SP NR 2 MAINT. PROCEDURES- INSPECTED CONN'S AND FOUND NO ISSUES. REF SWPM 20-63-02. FULLY ATTACHED BOTH CONNECTOR HALVES AND VERIFIED LOCKED TOGETHER.EMERGENCY LIGHT NOW OPS NORMAL. REF MM 33-
- [SDR ASAA2025060658678](https://openairdocs.org/sdr/ASAA2025060658678.md): Floorbeam · cracked · Jun 6, 2025 · N494AS · Boeing 737990ER · Fuselage Main, Floor Beam
  > AT OK TO INSTALL FOUND BREAKER PANEL RBL-0 AT STA. 540 CRACKED (MARKED). GROUNDED - YES. REMOVED AND REPLACED PANEL BREAK IAW B737-900 SRM 51-40-02-0G-0.
- [SDR ASAA2025053058679](https://openairdocs.org/sdr/ASAA2025053058679.md): Floorbeam · cracked · May 30, 2025 · N494AS · Boeing 737990ER · Fuselage Main, Floor Beam
  > PANEL BRAK AT STA 540 BL 0 TO LBL 24 IS CRACKED. GROUNDED - YES. REMOVED AND REPLACED PANEL BREAK IAW B737-900 SRM 51-40-02-0G-0.
- [SDR ASAA2025052858797](https://openairdocs.org/sdr/ASAA2025052858797.md): Battery Pack · inoperative · May 28, 2025 · N494AS · Boeing 737990ER · Emergency Lighting
  > AISLE AREA EMERGENCY LIGHTS AT SEATS ROWS 17, 19, 21, 23, AND L/H AND R/H AFT OVERWING LIGHTS FAILED OPS. GROUNDED - YES. REPLACED BATTERY PACKS EMERGENCY LIGHTS ON POWER SUPPLY M1670, M1671, M1694, OPS CHECK GOOD IAW B737-900 AMM 12-23-03-000-801, 21-23-03-40
- [SDR ASAA2023110646121](https://openairdocs.org/sdr/ASAA2023110646121.md): Module · faulty · Nov 6, 2023 · N494AS · Boeing 737990ER · APU Oil System
  > FOLLOW-UP TO REPORT OF APU NOT STARTING IN FLIGHT WITH FAULT 49-41010. (#PRI2/ETOPS)ETOPS SIGNIFICANT SYSTEM TASK AFFECTS APU ON DEMAND IN-FLIGHT START CAPABILITY. UPON COMPLETION, CONTACT MAINTENANCE CONTROL AND REPORT THAT THIS TASK HAS AFFECTED APU IN-FLIGH
- [SDR ASAA2023110246021](https://openairdocs.org/sdr/ASAA2023110246021.md): Unknown · unknown · Nov 2, 2023 · N494AS · Boeing 737990ER · APU Start/Ignition System
  > FAULT LIGHT ILLUMINATED DURING APU START ATTEMPT AT FL340 DURING FIRST AND SECOND TRY. SUCCESSFUL CSS ACCOMPLISHED AFTER FAULT LIGHT EXTINGUISHED AT FL300. GROUNDED - YES. PER SEAMC DUE TO APU BEING DEFERRED FOR THIS ISSUE, CSS IS CONSIDERED UNSATIFACTORY. APU
- [SDR ASAA2023103145949](https://openairdocs.org/sdr/ASAA2023103145949.md): Unknown · unknown · Oct 31, 2023 · N494AS · Boeing 737990ER · APU Start/Ignition System
  > FAULT LIGHT ILLUMINATED DURING APU START ATTEMPT AT FL360. SUCESSFUL CSS ACCOMPLISHED AFTER FAULT LIGHT EXTINGUISHED. GROUNDED - YES. INFO NOTED CSS UNSUCCESSFUL, PER SEAMC JEREMY MEL 49-99A WILL REMAIN ON AIRCRAFT.
- [SDR ASAA2023102945922](https://openairdocs.org/sdr/ASAA2023102945922.md): Unknown · unknown · Oct 29, 2023 · N494AS · Boeing 737990ER · APU Start/Ignition System
  > FAULT LIGHT ILLUMINATED DURING APU START ATTEMPT AT FL 340. SUCCESSFUL CSS ACCOMPLISHED AFTER FAULT LIGHT EXTINGUISHED AT FL 340. GROUNDED - YES. ON DEFERRAL.
- [SDR ASAA2023101445652](https://openairdocs.org/sdr/ASAA2023101445652.md): Unknown · unknown · Oct 14, 2023 · N494AS · Boeing 737990ER · Emergency Lighting
  > EXIT LIGHT/SING COVER FELL OFF NEAR THE L1 DOOR. GROUNDED - YES. RESECURE AS REQUIRED EXIT LIGHT/SING COVER LI DOOR REF AMM 250-51-01.
- [SDR ASAA2023071043958](https://openairdocs.org/sdr/ASAA2023071043958.md): Unknown · unknown · Jul 10, 2023 · N494AS · Boeing 737990ER · Autopilot System
  > VS SELECTOR WHEN YOU SCROLL IT GOES OPPOSITE DIRECTION EXAMPLE START UP -500FPM, YOU WENT -1000FPM AND SCROL DOWN IT WILL GO TO -250FPM. GROUNDED - YES. DFCS BITE PERFORMED PER FIM 22-11 TASK801. NO CURRENT FAULTS AND NO FAULT HISTORY PERFORMED GOOD BITE LIBRA
- [SDR ASAA2023070243820](https://openairdocs.org/sdr/ASAA2023070243820.md): Battery · inoperative · Jul 2, 2023 · N494AS · Boeing 737990ER · Emergency Lighting
  > ROW 27 BIN EMERGENCY LIGHT INOP. GROUNDED - YES. REPLACED BATTERY S/N 410836 FOR ROW #27 EMERGENCY LIGHT OPS CHECK GOOD IAW B737-900 AMM 33-51-06-960-805.
- [SDR ASAA2023062744146](https://openairdocs.org/sdr/ASAA2023062744146.md): Battery Pack · inoperative · Jun 27, 2023 · N494AS · Boeing 737990ER · Emergency Lighting
  > L-1 AND R1 EMERGENCY LIGHTS INOP. GROUNDED - YES. REMOVED, REPLACED, AND OPS CHECKED GOOD L1 AND R1 EMERGENCY LIGHT BATTERY PACKS IAW B737-900 AMM 33-51-06-960-805.
- [SDR ASAA2023062743819](https://openairdocs.org/sdr/ASAA2023062743819.md): Battery Pack · inoperative · Jun 27, 2023 · N494AS · Boeing 737990ER · Emergency Lighting
  > EMERGENCY AISLE LIGHTS AT SEATS 9, 13, 25 AND 29 INOP. GROUNDED - YES. REMOVED, REPLACED BATTERY PACKS S/N 411938 / 411873 AND OP CHECKED GOOD EMERGENCY AISLE LIGHTS AT SEATS 9, 13, 25, AND 29 IAW B737-900 AMM 33-51-06-960-805 AND 33-51-00-720-801.
- [SDR ASAA2023051043221](https://openairdocs.org/sdr/ASAA2023051043221.md): Harness · chafed · May 10, 2023 · N494AS · Boeing 737990ER · Fire Protection System Wiring
  > ENG #1 FIRE LOOP "B" INOP. GROUNDED - YES. REMOVED AND REPLACED CORE FIRE DETECTOR HARNESS MW0326 REF B737-900 AMM 26-11-02.
- [SDR ASAA2023021741984](https://openairdocs.org/sdr/ASAA2023021741984.md): Transmitter · faulty · Feb 17, 2023 · N494AS · Boeing 737990ER · Autopilot System
  > UNSUCCESFUL AUTOLAND APPROX 100 FT AGI. A/P DRIFTED LEFT OF COURSE, APPROX 75 FT. GROUNDED - YES. DFCS 1 & 2 BITE SHOWS NO FAULTS LOGGED. HGS SHOWS APP WARN XTK RATE EXCEED FAULT. REMOVED/REPLACED AND ADJUSTED M930, SPOILER 9 POSITION SENSOR REF B737-900 AMM 2
- [SDR ASAA2023021241926](https://openairdocs.org/sdr/ASAA2023021241926.md): Unknown · unknown · Feb 12, 2023 · N494AS · Boeing 737990ER · Cabin Cooling System
  > LEFT PACK LIGHT ILLUMINATES ON MASTER CAUTION RECALL. LEFT RAM DOOR FULL OPEN LIGHT ILLUMINATED AT CRUISE. GROUNDED - YES. COMPLIED WITH PACK TEMP CONTROLLER BITE PROCEDURE REF B737-900 FIM 21-62 TASK 801. FOUND FAULT # 21-51406 (SRDA EXIT). NO FAULTS FOUND AF
- [SDR ASAA2023020441864](https://openairdocs.org/sdr/ASAA2023020441864.md): Spinner · damaged · Feb 4, 2023 · N494AS · Boeing 737990ER · Turbine Engine Air Inlet Section
  > WHILE PERFORMING INLET INSP #1 ENGINE TC 78472000 FRONT SPINNER CONE MISSING MORE THAN 50% OF SPIRAL MARKING. GROUNDED - YES. REMOVED AND REPLACED SPINNER CONE IAW B737-900 AMM 72-21-01.
- [SDR ASAA2023013081700](https://openairdocs.org/sdr/ASAA2023013081700.md): Hf Comm · false indication · Jan 28, 2023 · N494AS · Boeing 737990ER · HF Communications System
  > HF1 DISPLAS FAIL/FAIL. GROUNDED - YES. COMPLY WITH BITE CHECK HF1, REF FIM TASK 23-11-80, OP CHK GOOD FAIL LIGHT EXTINGUISHED.
- [SDR ASAA2023010141342](https://openairdocs.org/sdr/ASAA2023010141342.md): Warning Light · false activation · Jan 1, 2023 · N494AS · Boeing 737990ER · DC Generating System
  > AMBER "ELEC" LIGHT ILLUMINATED ON THE OVERHEAD ELECTRICAL PANEL. GROUNDED - YES. HAD AUX BATTERY CHARGER MESSAGE PERFORMED B737-900 FIM 24-31 TASK 801 FAULT CLEARED. BITE CHECK GOOD.
- [SDR ASAA2022100840207](https://openairdocs.org/sdr/ASAA2022100840207.md): Nozzle · coked · Oct 8, 2022 · N494AS · Boeing 737990ER · APU Engine Fuel and Control
  > APU TREND DATA SHOWS CT5ATP TEMP IS APPROACHING THE 605 DEGREES THRESHOLD AGAIN. ETOPS SIGNIFICANT SYSTEM TASK AFFECTS APU ON DEMAND IN-FLIGHT START CAPABILITY. UPON COMPLETION, CONTACT MAINTENANCE CONTROL AND REPORT THAT THIS TASK HAS AFFECTED APU IN-FLIGHT S
- [SDR ASAA2022080639394](https://openairdocs.org/sdr/ASAA2022080639394.md): Battery Pack · failed · Aug 6, 2022 · N494AS · Boeing 737990ER · Emergency Lighting
  > WHILE PERFORMING ASA T.C. # 78233001, EMERGENCY LTS IN AFT GALLEY OVERHEAD AND L2 DOOR DID NOT PASS CAPACITY CHECK. GROUNDED - YES. REMOVED AND REPLACED BATTERY PACK AT M1673 IAW B737-900 AMM 33-51-06-960-805.
- [SDR ASAA2022062238775](https://openairdocs.org/sdr/ASAA2022062238775.md): Exciter · inoperative · Jun 22, 2022 · N494AS · Boeing 737990ER · Ignition Power Supply
  > #1 ENG NO LIGHT OFF WITH RIGHT IGNITION. SUCCESSFULLY STARTED WITH LEFT IGNITION. GROUNDED - YES. REMOVED AND REPLACED IGNITER PLUG, HARNESS AND EXCITER BOX REF B737-900 AMM 74-11-01/401, 74-21-01/401 AND 74-21-02/401. AUDIBLE TEST CHECK PASSED REF AMM 74-00-0
- [SDR ASAA2022061738689](https://openairdocs.org/sdr/ASAA2022061738689.md): Autothrottle Sys · false indication · Jun 17, 2022 · N494AS · Boeing 737990ER · Auto Throttle System
  > AUTO THROTTLE DISCONNECTED WHEN TOGA PUSHED ON TAKEOFF. GROUNDED - YES. PERFORMED AUTOTHROTTLE BITE TEST IAW B737-900 FIM TASK 23-31 TASK 801. NO DEFECTS NOTED. NO FAULTS LAST 15 FLIGHTS. ACCOMPLISHED HGS SYSTEM TEST IAW SMM I34-36-00 AND DFCS LAND VERIFY TEST
- [SDR ASAA2022061038605](https://openairdocs.org/sdr/ASAA2022061038605.md): Ecu · faulty · Jun 10, 2022 · N494AS · Boeing 737990ER · APU Controls
  > APU TREND DATA SHOWS CT5ATP TEMP IS AT OR ABOVE THE THRESHOLD 593 DEGREES BUT LESS THAN 605 DEGREES. GROUNDED - YES. REF B737-900 AMM 49-61-12 REMOVED AND REPLACED ECU. OPS CHECK GOOD.
- [SDR ASAA2022051838389](https://openairdocs.org/sdr/ASAA2022051838389.md): Fms · faulty · May 18, 2022 · N494AS · Boeing 737990ER · Flight Management Computing Hardware System
  > VTK DISPLAYED ON F/O ND DURING TAXI IN. GROUNDED - YES. PER B737-900 FIM 34-61 TASK 836, ACCOMPLISHED INITIAL EVALUATION, SYSTEM RESET. VTK FLAG ON F/O ND IS NO LONGER DISPLAYED.
- [SDR ASAA2022051738346](https://openairdocs.org/sdr/ASAA2022051738346.md): Sensor · failed · May 17, 2022 · N494AS · Boeing 737990ER · APU Controls
  > FOLLOWUP TO HISTORY OF APU OVERSPEED LIGHT AND SHUTDOWN. ETOPS SIGNIFICANT SYSTEM TASK AFFECTS APU ON DEMAND IN-FLIGHT START CAPABILITY. UPON COMPLETION, CONTACT MAINTENANCE CONTROL AND REPORT THAT THIS TASK HAS AFFECTED APU IN-FLIGHT START CAPABILITY, MEL 49-
- [SDR ASAA2022050538214](https://openairdocs.org/sdr/ASAA2022050538214.md): Modulating Valve · faulty · May 5, 2022 · N494AS · Boeing 737990ER · Cabin Cooling System
  > RIGHT PACK LIGHT ON RECALL CLEARS W/ MASTER CAUTION RESET. GROUNDED - YES. FOUND RIGHT PACK TCV CONTINOUSLY RUNNING A/C MOTOR VERY HOT WITH NO BLEED LOAD APPLIED. REMOVED AND REPLACED RIGHT PACK TCV REF B737-900 AMM 21-51-10. OPS AND LEAK CHECK GOOD.
- [SDR ASAA2022042438114](https://openairdocs.org/sdr/ASAA2022042438114.md): Tuning Unit · faulty · Apr 24, 2022 · N494AS · Boeing 737990ER · HF Communications System
  > HF #1 RADIO INTERMITTENTLY + AUTOMATICALLY CHANGES THE " ACTIVE" FREQ FROM WHAT WAS MANUALLY SET(8843) TO 3254 WITH NO PILOT INPUT. HF#1 CONFIRMED TO WORK FINE + SELCAL FINE WHEN TESTED BUT KEEPS CHANGING THE ACTIVE FREQ FROM WHAT IS SET TO "3254" ON ITS OWN A
- [SDR ASAA2022040537902](https://openairdocs.org/sdr/ASAA2022040537902.md): Bulb · inoperative · Apr 5, 2022 · N494AS · Boeing 737990ER · Emergency Lighting
  > R1 DOOR EXTERIOR EMERGENCY LIGHT INOP. GROUNDED - YES. RELAMPED R1 EXTERIOR EMERGENCY LIGHT REF B737-900 AMM 33-51-04. OPS TEST GOOD.
- [SDR ASAA2022020837376](https://openairdocs.org/sdr/ASAA2022020837376.md): Display · faulty · Feb 8, 2022 · N494AS · Boeing 737990ER · Central Display
  > 2 HOURS PART TAKEOFF WE GOT MASTER CAUTION ENGINE LIGHT. BOTH ENGINE EEC ALTN LIGHT ILLUMINATED COMPLIED W/ QRH. NO FURTHER ANOMALIES NOTED. DIVERTED BACK TO KSJC. LANDED NORMALLY. ALSO DISPLAY SOURCE 1. GROUNDED - YES. AIR TURNBACK - DIVERSION TIME 81 MINUTES
- [SDR ASAA2022011437169](https://openairdocs.org/sdr/ASAA2022011437169.md): Fmc · faulted · Jan 14, 2022 · N494AS · Boeing 737990ER · Flight Management Computing Hardware System
  > NO VSPEED AND LDG AIT FLAPS ON FO'S PFD. LNAV AND VNAV WON'T ENGAGE. GROUNDED - YES. PERFORMED OPS CHK ON FMC REF B737-900 AMM 34-61-04 OPS GOOD. OK FOR SVC.
- [SDR ASAA2022011037123](https://openairdocs.org/sdr/ASAA2022011037123.md): Display · damaged · Jan 10, 2022 · N494AS · Boeing 737990ER · Flight Management Computing Hardware System
  > L/H FMCS CONTROL DISPLAY UNIT (CDU) HAS DAMAGED HARDWARE. GROUNDED - YES. REMOVED AND REPLACED FMCS (#1 - L/H SIDE) CONTROL DISPLAY UNIT REF B737-900 AMM 34-61-01-000/400-802. ACCOMPLISHED CDU SOFTWARE CONFIGURATION CHECK REF AMM 34-61-00-750-802. PER IPC 34-6
- [SDR ASAA2021112236692](https://openairdocs.org/sdr/ASAA2021112236692.md): Unknown · unknown · Nov 22, 2021 · N494AS · Boeing 737990ER · Auto Throttle System
  > AUTOTHROTTLE DISENGAGED DURING FLIGHT WILL NOT RE-ENGAGE. GROUNDED - YES. NO CURRENT FAULTS. BITE HISTORY SHOWED MSG 22-31687 CHANNEL A RATE AND SPEED MONITOR ASM 1. CW B737-900 FIM 22-32 TASK 819 NO FAULTS GROUND VERIFICATION TEST PASS.
- [SDR ASAA2021111736631](https://openairdocs.org/sdr/ASAA2021111736631.md): Unknown · unknown · Nov 17, 2021 · N494AS · Boeing 737990ER · Flight Management Computing Hardware System
  > AFTER LANDING, RIGHT FMC CYCLES IN AND OUT (VTK DISPLAYED). GROUNDED - YES. DFCS CHANNEL B FAULT REVIEW RESULTED IN MSG 22-11822 FMC DATA INV FOR THIS LEG. ACCOMPLISHED B737-900 FIM 22-11TASK 811. NO FAULTS NOTED. REPAIR CONFIRMATION PASSES. ACCOMPLISHED FMC R
- [SDR ASAA2021111436588](https://openairdocs.org/sdr/ASAA2021111436588.md): Sliding Window · faulty · Nov 14, 2021 · N494AS · Boeing 737990ER · Windshield/Door Rain/Ice Removal
  > RIGHT WINDOW HEAT "OVERHEAT" ILLUMINATED DURING DESCENT. QRH DID NOT CLEAR THE OVERHEAT. GROUNDED - YES. COMPLETED STEPS (F)6 AND 7 OF B737-900 AMM TASK 56-12-11-400-801. VERIFIED CORRECT TERMINAL BOARD TAP PER B737-900 WDM 30-41-11. REMOVED AND REPLACED R2 W
- [SDR ASAA2021111336587](https://openairdocs.org/sdr/ASAA2021111336587.md): Unknown · unknown · Nov 13, 2021 · N494AS · Boeing 737990ER · Windshield/Door Rain/Ice Removal
  > RT SIDE WINDOW HEAT LIGHT ILLUMINATED (OVERHEAT). GROUNDED - YES. RAN QRH AND RESET. LIGHT (OVERHEAT) WENT AWAY.
- [SDR ASAA2021101736332](https://openairdocs.org/sdr/ASAA2021101736332.md): Blower · none · Oct 17, 2021 · N494AS · Boeing 737990ER · Independent Position Determining System
  > LOUD BUZZING SOUND COMING FROM CNETER CONSOLE. SOUND IS SIMILAR TO A FAN WITH BEARINGS THAT ARE FAILING. GROUNDED - YES. FOUND WEATHER RADAR R/T MOUNT BLOWER ASSY LOUDER THAN NORMAL. REPLACED WEATHER RADAR R/T MOUNT BLOWER ASSY PER B737-900 AMM 34-43-51 PG 401
- [SDR ASAA2021090435857](https://openairdocs.org/sdr/ASAA2021090435857.md): Bulb · burned out · Sep 4, 2021 · N494AS · Boeing 737990ER · Emergency Lighting
  > FOUND EXTERIOR LIGHT BY L2 DOOR INOP. GROUNDED - YES. REPLACED LAMP OF EXTERIOR EMERGENCY LIGHT BY L2 DOOR. OPS CHECK GOOD REF B737-900 AMM 33-51-04-960-801.
- [SDR ASAA2021080235570](https://openairdocs.org/sdr/ASAA2021080235570.md): Transition Panel · corroded · Jul 20, 2021 · N494AS · Boeing 737990ER · Fuselage Miscellaneous Structure
  > FWD PIT FLOOR STRUCTURE, TRANSITION PANEL CORRODED AT UPPER SURFACE AT APPROX. LBL-24 BETWEEN BS 500D AND 5001. DOT:H394 GROUNDED - YES. EVALUATION OF L/H TRANSITION PANEL FROM BS 500 G TO 500I IAW B737-900ER SRM 53-00-53-1A-2 ORIGINAL MATERIAL THIKS AS.0

Next page: https://openairdocs.org/aircraft/N494AS/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 n_number = 'N494AS' AND registry_match = 'registration'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/aircraft/N494AS/reports

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