# N931AK: 2021 Boeing 737-9

- Status: Valid registration
- Airframe: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (registry code 138469A, 48 seats)
- Engine: [CFM International LEAP-1B28 series](https://openairdocs.org/engine/cfm-international-leap-1b28-series) (registry code 13120)
- Data sheets: [TCDS A16WE](https://openairdocs.org/tcds/A16WE) (The Boeing Company), [TCDS E00088EN](https://openairdocs.org/tcds/E00088EN) (CFM International S.A.) (OpenAirDocs)
- Serial number: 43353
- Year built: 2021
- Type: Fixed wing multi engine
- Engine type: Turbo-fan
- Airworthiness: Standard, transport
- Airworthiness date: December 1, 2021
- Certificate issued: December 8, 2021
- Expires: December 31, 2028
- Mode S code: ACE96A
- Registered owner: [Bank Of Utah Trustee](https://openairdocs.org/faa-owner/BANK%20OF%20UTAH%20TRUSTEE)
- Location: [Salt Lake City, UT](https://openairdocs.org/faa-place/UT/Salt%20Lake%20City)
- Owner type: Corporation
- Owner's area on the map: 40.7558° N, 111.8843° W: Placed by OpenAirDocs at the center of ZIP code 84111, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=931AK
- Page: https://openairdocs.org/aircraft/N931AK

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every CFM International LEAP-1B28 model are included.

## ADs that may apply (OpenAirDocs): 48 in force

### Matched by airframe (Boeing 737-9)

- [AD 2026-18-07](https://openairdocs.org/ad/2026-18-07): Fuselage · Boeing 737-8, 737-9 and 737-8200. Effective Oct 22, 2026
- [AD 2026-15-11](https://openairdocs.org/ad/2026-15-11): Fuselage · Boeing 737-8, 737-9 and 737-8200. Effective Sep 10, 2026
- [AD 2026-14-11](https://openairdocs.org/ad/2026-14-11): Air Conditioning · Boeing 737-8, 737-9 and 737-8200. Effective Jul 13, 2026
- [AD 2026-13-17](https://openairdocs.org/ad/2026-13-17): Navigation · Boeing 737-8, 737-9 and 737-8200. Effective Jul 1, 2026
- [AD 2026-13-02](https://openairdocs.org/ad/2026-13-02): Navigation · Airbus Canada Limited Partnership 18, 49-46, 80-A and 555 more. Effective Jul 1, 2026
- [AD 2025-25-04](https://openairdocs.org/ad/2025-25-04): Equipment/furnishings · Boeing 737-600 Series, 737-700 Series, 737-700C Series and 6 more. Effective Jan 16, 2026
- [AD 2025-02-07](https://openairdocs.org/ad/2025-02-07): Navigation · Modification of Rockwell Collins, Inc. Multi-Mode Receiver (STC ST01883WI or 4 others). Effective Mar 17, 2025
- [AD 2024-23-11](https://openairdocs.org/ad/2024-23-11): Flight controls · Boeing 737-8, 737-9 and 737-8200. Effective Jan 6, 2025
- [AD 2024-19-06](https://openairdocs.org/ad/2024-19-06): Ice/Rain Protection System · Boeing 737-8 and 737-9. Effective Nov 26, 2024
- [AD 2024-13-02](https://openairdocs.org/ad/2024-13-02): Oxygen · Boeing 737-8, 737-9, 737-8200 and 3 more. Effective Jul 25, 2024
- [AD 2024-06-03](https://openairdocs.org/ad/2024-06-03): Electrical Power · Boeing 737-8 and 737-9. Effective May 22, 2024
- [AD 2024-03-04](https://openairdocs.org/ad/2024-03-04): Flight controls · Boeing 737-8, 737-9 and 737-8200. Effective Feb 12, 2024
- [AD 2024-02-51](https://openairdocs.org/ad/2024-02-51): Doors · Boeing 737-9. Effective Jan 18, 2024
- [AD 2023-15-05](https://openairdocs.org/ad/2023-15-05): Ice and Rain Protection, Powerplant · Boeing 737-8, 737-9 and 737-8200. Effective Aug 25, 2023
- [AD 2023-12-11](https://openairdocs.org/ad/2023-12-11): Navigation · Boeing 737-8, 737-9 and 737-8200. Effective Jun 21, 2023
- [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02): Indicating/Recording System, Navigation · Boeing 18, 23, 35 and 1,060 more. Effective May 26, 2023
- [AD 2023-05-06](https://openairdocs.org/ad/2023-05-06): Fuel · Boeing 737-8, 737-9 and 737-8200. Effective May 10, 2023
- [AD 2023-04-17](https://openairdocs.org/ad/2023-04-17): Fuel · Boeing 737-600 Series, 737-700 Series, 737-700C Series and 5 more. Effective May 1, 2023
- [AD 2023-06-10](https://openairdocs.org/ad/2023-06-10): Ice and Rain Protection, Powerplant · Boeing 737-8, 737-8200 and 737-9. Effective Apr 11, 2023
- [AD 2022-24-09](https://openairdocs.org/ad/2022-24-09): Air conditioning · Boeing 737-100 Series, 737-200 Series, 737-200C Series and 12 more. Effective Jan 26, 2023
- [AD 2022-06-06](https://openairdocs.org/ad/2022-06-06): Flight controls · Boeing 737-600 Series, 737-700 Series, 737-700C Series and 5 more. Effective Jun 16, 2022
- [AD 2021-19-19](https://openairdocs.org/ad/2021-19-19): Wings · Boeing 737-9. Effective Dec 8, 2021
- [AD 2021-13-18](https://openairdocs.org/ad/2021-13-18): Powerplant · Boeing 737-8, 737-8200 and 737-9. Effective Sep 3, 2021
- [AD 2021-16-15](https://openairdocs.org/ad/2021-16-15): Air conditioning · Boeing 737-8, 737-800 Series, 737-8200 and 2 more. Effective Aug 9, 2021
- [AD 2021-12-13](https://openairdocs.org/ad/2021-12-13): Fuel · Boeing 737-8 and 737-9. Effective Jul 29, 2021
- [AD 2021-10-07](https://openairdocs.org/ad/2021-10-07): Autoflight, Flight controls · Boeing 737-8 and 737-9. Effective Jul 8, 2021
- [AD 2021-08-04](https://openairdocs.org/ad/2021-08-04): Oxygen · Boeing 737-200 Series, 737-300 Series, 737-400 Series and 23 more. Effective May 26, 2021
- [AD 2021-09-08](https://openairdocs.org/ad/2021-09-08): Electrical power system · Boeing 737-8 and 737-9. Effective Apr 30, 2021
- [AD 2021-01-04](https://openairdocs.org/ad/2021-01-04): Doors · Boeing 737-600 Series, 737-700 Series, 737-700C Series and 5 more. Effective Mar 29, 2021
- [AD 2020-24-02](https://openairdocs.org/ad/2020-24-02): Auto flight, Flight controls, and Indicating/recording systems · Boeing 737-8 and 737-9. Effective Nov 20, 2020
- [AD 2020-21-02](https://openairdocs.org/ad/2020-21-02): Fire protection · Airbus Canada Limited Partnership BD-500-1A10, BD-500-1A11, A330-201 and 45 more. Effective Nov 19, 2020
- [AD 2020-11-12](https://openairdocs.org/ad/2020-11-12): Nacelles/pylons · Boeing 737-8 and 737-9. Effective Jul 30, 2020
- [AD 2020-14-09](https://openairdocs.org/ad/2020-14-09): Fuel storage · Boeing 737-8 and 737-9. Effective Jul 15, 2020
- [AD 2020-03-10](https://openairdocs.org/ad/2020-03-10): Fuselage · Boeing 737-600 Series, 737-700 Series, 737-700C Series and 5 more. Effective Mar 27, 2020
- [AD 2019-18-03](https://openairdocs.org/ad/2019-18-03): Exhaust · Boeing 737-600 Series, 737-700 Series, 737-700C Series and 5 more. Effective Oct 3, 2019
- [AD 2019-14-12](https://openairdocs.org/ad/2019-14-12): Flight Controls · Boeing 737-8 and 737-9. Effective Aug 30, 2019
- [AD 2019-14-02](https://openairdocs.org/ad/2019-14-02): Hydraulic power · Boeing 737-100 Series, 737-200 Series, 737-200C Series and 11 more. Effective Aug 27, 2019
- [AD 2018-23-12](https://openairdocs.org/ad/2018-23-12): Equipment/furnishings · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 180 more. Effective Dec 28, 2018
- [AD 2018-20-13](https://openairdocs.org/ad/2018-20-13): Fuel · Boeing 757-200 Series, 757-200CB Series, 757-200PF Series and 13 more. Effective Nov 15, 2018

### Matched by engine (CFM International LEAP-1B28 series)

- [AD 2025-14-08](https://openairdocs.org/ad/2025-14-08): Turbine Section · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective Aug 25, 2025
- [AD 2025-04-12](https://openairdocs.org/ad/2025-04-12): Turbine Section · CFM International LEAP-1A23, LEAP-1A24, LEAP-1A24E1 and 24 more. Effective Apr 8, 2025
- [AD 2024-25-02](https://openairdocs.org/ad/2024-25-02): Turbine Engine Compressor Section · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective Feb 12, 2025
- [AD 2023-07-11](https://openairdocs.org/ad/2023-07-11): Turbine Engine Compressor Section · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective Jun 13, 2023
- [AD 2022-17-02](https://openairdocs.org/ad/2022-17-02): Turbine Engine Accessory Drive · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective Oct 20, 2022
- [AD 2022-11-02](https://openairdocs.org/ad/2022-11-02): Turbine Engine Compressor Section, Turbine Section · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective Jul 8, 2022
- [AD 2021-10-06](https://openairdocs.org/ad/2021-10-06): Engine Controls · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective May 10, 2021
- [AD 2020-06-01](https://openairdocs.org/ad/2020-06-01): Turbine/Turboprop · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective Apr 16, 2020
- [AD 2018-20-01](https://openairdocs.org/ad/2018-20-01): Turbine Section · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective Dec 17, 2018

### Historical (superseded or no longer in force)

- [AD 2026-13-05](https://openairdocs.org/ad/2026-13-05) (historical): Air conditioning · Boeing 737-8, 737-9 and 737-8200. Effective Jul 16, 2026
- [AD 2026-04-05](https://openairdocs.org/ad/2026-04-05) (historical): Electrical Power · Boeing 737-8, 737-9 and 737-8200. Effective Feb 24, 2026
- [AD 2023-09-04](https://openairdocs.org/ad/2023-09-04) (historical): Equipment/furnishings · Boeing 737-600 Series, 737-700 Series, 737-700C Series and 5 more. Effective Jun 29, 2023
- [AD 2022-03-20](https://openairdocs.org/ad/2022-03-20) (historical): Navigation · Boeing 737-8, 737-9 and 737-8200. Effective Jan 31, 2022
- [AD 2021-14-20](https://openairdocs.org/ad/2021-14-20) (historical): Cabin Altitude Pressure Switches · Boeing 737-100 Series, 737-200 Series, 737-200C Series and 12 more. Effective Jul 20, 2021
- [AD 2020-03-20](https://openairdocs.org/ad/2020-03-20) (historical): Navigation · Modification of Rockwell Collins, Inc. Multi-Mode Receiver (STC ST01883WI or 4 others). Effective Feb 18, 2020
- [AD 2018-23-51](https://openairdocs.org/ad/2018-23-51) (historical): Flight controls · Boeing 737-8 and 737-9. Effective Dec 21, 2018
- [AD 2023-23-12](https://openairdocs.org/ad/2023-23-12) (historical): Turbine Section · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective Jan 16, 2024
- [AD 2019-12-01](https://openairdocs.org/ad/2019-12-01) (historical): Turbine Engine Accessory Drive · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective Jul 3, 2019
- [AD 2018-25-09](https://openairdocs.org/ad/2018-25-09) (historical): Engine Controls · CFM International LEAP-1B21, LEAP-1B23, LEAP-1B25 and 8 more. Effective Dec 26, 2018

## Information bulletins (advisory) (4 in force)

- [SAIB 2026-17](https://openairdocs.org/saib/2026-17): VNAV Approach Disconnect Following Missed Approach, Anomaly on Airplanes with FMC U14.0/14.1. Issued Oct 3, 2026
- [SAIB NM-20-02](https://openairdocs.org/saib/NM-20-02): Fire Protection. Issued Mar 11, 2020
- [SAIB NE-19-03](https://openairdocs.org/saib/NE-19-03): Escape Slide Maintenance Tasks and Intervals - JASC 2565. Issued Feb 19, 2019
- [SAIB NM-18-33](https://openairdocs.org/saib/NM-18-33): Engine Fuel and Control. Issued Dec 17, 2018

## NTSB investigations

None matched to N931AK.

## FAA accident and incident reports

None matched to N931AK.

## Service difficulty reports (58, newest 50)

As reported by operators and repair stations. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

- [SDR ASAA2025092761250](https://openairdocs.org/sdr/ASAA2025092761250), Sep 27, 2025: SEAT TRACK. DAMAGED. AFTER FITHER INSPECTION CAPTAIN SEAT TRACK IS DAMAGED (AFT I/B). SRXR430X. GROUNDED - YES. REMOVED AND REPLACED CAPITAN AFT I/B SEAT TRACK IAW IPECO CMM 53-01-0
- [SDR ASAA2025032956965](https://openairdocs.org/sdr/ASAA2025032956965), Mar 29, 2025: LENS. MISSING. 16A EXIT SIGN COVER MISSING ON LOWER WALL. GROUNDED - YES. REPLACED EXIT SIGN COVER AT ROW 16A AS REQUIRED.
- [SDR ASAA2025021456023](https://openairdocs.org/sdr/ASAA2025021456023), Feb 14, 2025: INDICATION SYS. MALFUNCTIONED. RIGHT MAIN TANK FUEL QTY IND STILL APPEARS TO BE ERRONEOUS. ON GROUND AFTER REFUELING, BOTH MAIN TANKS WERE WITHIN 20 LBS OF EACH OTHER . AFTER PUSH & ENG START
- [SDR ASAA2025021456019](https://openairdocs.org/sdr/ASAA2025021456019), Feb 14, 2025: INDICATION SYS. MALFUNCTIONED. RIGHT MAIN TANK FUEL QUANTITY INDICATION APPEARS TO BE ERRONEOUS. JUST PRIOR TO CENTER FUEL EMPTYING RIGHT MAIN QTY JUMPED TO 9140 LBS, WHERE IT STABILIZED FOR 
- [SDR ASAA2024070850861](https://openairdocs.org/sdr/ASAA2024070850861), Jul 8, 2024: LIGHT. MISSING. FLOOR TRIM ON RIGHT SIDE OF CENTER AISLE CARPET STICKING UP BY ROW 1. GROUNDED - YES. FOUND THAT FLOOR PROXIMITY LIGHTING COMING UP SHARP EDGE AMD MISSING IN A 
- [SDR ASAA2023110846112](https://openairdocs.org/sdr/ASAA2023110846112), Nov 8, 2023: MODULATING VALVE. FAULTY. TECH SERVICES REQUEST FOR FOLLOW-UP TO MTX LIGHT & FAULT(RIGHT FAMV FAULT 36-12021)----(#PRI1)----ETOPS SIGNIFICANT SYSTEM----. GROUNDED - YES. (RESOLVED ON W/O
- [SDR ASAA2023110846074](https://openairdocs.org/sdr/ASAA2023110846074), Nov 8, 2023: CONTROL UNIT. FAULTY. L D=FWD WINDOW HEAT, OVERHEAT LIGHT ILLUMINATED AFTER LANDING. GROUNDED - YES. PERFORMED WINDOW HEAT CONTROLLER BITE IAW IFIM 30-41-11-710-801. NO FAULTS. REMOV
- [SDR ASAA2023110646062](https://openairdocs.org/sdr/ASAA2023110646062), Nov 6, 2023: UNKNOWN. UNKNOWN. ON ROLLOUT FROM LANDING MAIT LIGHT OVER HEAD PANEL ILLUMINATED. GROUNDED - YES. PERFORMED FIM TASK 36-12-00-810-802 PNEUMATIC ENG ON SYS TEST FOR R/H.TEST PASSE
- [SDR ASAA2023102445814](https://openairdocs.org/sdr/ASAA2023102445814), Oct 24, 2023: ACTUATOR. FAULTY. BOTH DUCT PRESSURE NEEDLES FLUCTUATE BETW 20-28 PSI WHILE ON APU BLEED AIR ON THE GROUND. GROUNDED - YES. (RESOLVED ON W/O: 1974919 TASKCARD: N/R-00001 ) FOUND 
- [SDR ASAA2023101345631](https://openairdocs.org/sdr/ASAA2023101345631), Oct 13, 2023: SENSOR. FAULTY. APU HAS MILD SURGING DURING NORMAL OPERATION. GROUNDED - YES. R+R DELTA PRESSURE SENSOR REF AMM 49-52-33-000-801/400-801 AND TOTAL PRESSURE SENSOR REF AMM 49-52
- [SDR ASAA2023092445303](https://openairdocs.org/sdr/ASAA2023092445303), Sep 24, 2023: UNKNOWN. UNKNOWN. APU BLEED DUAL PRESSURE FLUCTUATES BETWEEN 0 AND 40PACK SELECTION LEFT RIGHT OR BOTH MAKE NO DIFFERENCE. GROUNDED - YES. (RESOLVED ON W/O: 1971307 TASKCARD: N/R
- [SDR ASAA2023092445262](https://openairdocs.org/sdr/ASAA2023092445262), Sep 24, 2023: UNKNOWN. UNKNOWN. APU HAD FLUCTUATING BLEED AIR PRESSURE DROPPED TO 0 TWICE STABILIZED AFTER 3 MINUTES. GROUNDED - YES. APU DUCT PRESSURE WITHIN LIMITS AND STABLE REF B737-9 AMM 
- [SDR ASAA2023092345254](https://openairdocs.org/sdr/ASAA2023092345254), Sep 23, 2023: UNKNOWN. UNKNOWN. APU FAULT ON 2 START ATTEMPTS. GROUNDED - YES. INTEROGATED SYSTEM FOUND MX MESSAGES 49.4142 & WHEN START ATTEMPTED NEW MX MSG 49.41254. Y 30507ACCOMPLISHED IFIM
- [SDR ASAA2023091745187](https://openairdocs.org/sdr/ASAA2023091745187), Sep 17, 2023: UNKNOWN. UNKNOWN. UNABLE TO TRANSMIT ON HF 1, HF 2 WORKED NORMALLY. GROUNDED - YES. ON DEFERRAL.
- [SDR ASAA2023091145057](https://openairdocs.org/sdr/ASAA2023091145057), Sep 11, 2023: PUMP. LEAKING. #2 ENGINE HYD PUMP LEAKING AT CASE SPLIT. GROUNDED - YES. REPLACED #2 ENGINE HYD PUMP REF AMM 29-11-11, OPS CK GOOD. LEAK CHECK GOOD. HYD FLUSH NOT REQUIRED.
- [SDR ASAA2023090745027](https://openairdocs.org/sdr/ASAA2023090745027), Sep 7, 2023: ELECTRONIC UNIT. FAULTY. HF#1 RECEIVE NO TRANSMIT. GROUNDED - YES. REPLACED REU REF AMM 23-51-01-000/400-801 (REF LP 60911257 FOR P/N TRANSACTION) VERIFIED OPS CK OF HF #1 RECEIVE/TRANS
- [SDR ASAA2023090144914](https://openairdocs.org/sdr/ASAA2023090144914), Sep 1, 2023: MODULATING VALVE. FAULTY. WHILE ACCOMPLISHING T/C 31-005-00. FOUND SMT FAULT "BLEED FAMV RVDT L" ON ENG 1. GROUNDED - YES. REMOVED & REPLACED FAN AIR MODULATING VALVE REF AMM 36-12-03-00
- [SDR ASAA2023090144902](https://openairdocs.org/sdr/ASAA2023090144902), Sep 1, 2023: UNKNOWN. UNKNOWN. MAINT LIGHT ON AFT OVERHEAD PANEL IS ON. GROUNDED - YES. OMF SHOWS MAINTENANCE MESSAGE 73-42701. ACCOMPLISHED IFIM G73-21-00-810-847. EEC CHANNEL-B POWER NOT AV
- [SDR ASAA2023081544603](https://openairdocs.org/sdr/ASAA2023081544603), Aug 15, 2023: FILTER. CLOGGED. CONT CAB FWD & AFT CAB TEMPERATURE CONTROL KNOBS SMALL MOVEMENTS PRODUCE WILD TEMPERATURE SWINGS. CONTROL CAB WORST, IT KEEPS MOVING HIGHER IN TEMP AFTER A DEME
- [SDR ASAA2023081444606](https://openairdocs.org/sdr/ASAA2023081444606), Aug 14, 2023: UNKNOWN. UNKNOWN. HF2 RADIO FAILURE, NO TRANSMIT NOR RECEIVE CAPABILITY. GROUNDED - YES. DIVERSION - CYCLED POWER ON HF2, BITE CHECK GOOD REF FIM 23-11-801. HF2 GROUND VERIFICATI
- [SDR ASAA2023081444605](https://openairdocs.org/sdr/ASAA2023081444605), Aug 14, 2023: TRANSCEIVER. FAULTY. HF1. BOTH HF1 AND HF2 RECEIVE NORMALLY, BUT COULD ONLY TRANSMIT ON HF2. ADDITIONALLY, COULD ONLY RECIEVE SELCAL CHECK ON HF2. CPDLC LOGON AND COMMUNICATIONS SUC
- [SDR ASAA2023080844498](https://openairdocs.org/sdr/ASAA2023080844498), Aug 8, 2023: UNKNOWN. UNKNOWN. USING HF#1, THE HF ANTENNA WAS UNABLE TO TUNE ON MULTIPLE HF FREQUENCIES. (HF #2 WORKS NORMAL). A STEADY TONE LASTING APPROXIMATELY 10 SECONDS WOULD PRECEED OUR
- [SDR ASAA2023080344440](https://openairdocs.org/sdr/ASAA2023080344440), Aug 3, 2023: UNKNOWN. UNKNOWN. RADAR DOES NOT DISPLAY WX IN AUTO OR MANUAL MODE. GROUNDED - YES. WEATHER RADAR OPERATIONAL TEST PASSES, SYSTEM TEST FAILS - NO WEATHER OR GROUND RETURN. REFERE
- [SDR ASAA2023080144377](https://openairdocs.org/sdr/ASAA2023080144377), Aug 1, 2023: UNKNOWN. UNKNOWN. WHILE PERFORMING T/C 31-005-00 AND T/C 05-020-01 FOUND LATCHED MESSAGE BLEED FAMV RVDT L ON ENG. 1. GROUNDED - YES. ON DEFERRAL.
- [SDR ASAA2023071444025](https://openairdocs.org/sdr/ASAA2023071444025), Jul 14, 2023: UNKNOWN. UNKNOWN. FLIGHT ATTENDANT REPORTS R2 DOOR MAKING NOISE AT CRUISE FL330 PSID 7.8 DOOR HANDLE INDICATES CLOSED PROPERLY. NO DOOR OPEN LIGHTS. PRESSURIZATION NORMAL. DOOR N
- [SDR ASAA2023071344031](https://openairdocs.org/sdr/ASAA2023071344031), Jul 13, 2023: UNKNOWN. UNKNOWN. HF #2 FAILED ENROUTE. GROUNDED - YES. ON DEFERRAL.
- [SDR ASAA2023070843925](https://openairdocs.org/sdr/ASAA2023070843925), Jul 8, 2023: TRANSCEIVER. FAULTY. HF #2 C/B POPPED. GROUNDED - YES. REMOVED AND REPLACED #2 HF TRANSCEIVER REF B737-9 AMM 23-11-21. OPERATIONAL TEST PASS.
- [SDR ASAA2023070643913](https://openairdocs.org/sdr/ASAA2023070643913), Jul 6, 2023: UNKNOWN. UNKNOWN. TECH SERVICES FOLLOW UP ON URGENT CNR 20230706003 FOR #1 ENG (60A314) CUMULATIVE ODMS CHIP COUNT INCREASE - LOW THRESHOLD - URGENT. GROUNDED - YES. PERFORMED OD
- [SDR ASAA2023062943805](https://openairdocs.org/sdr/ASAA2023062943805), Jun 29, 2023: UNKNOWN. UNKNOWN. TWO APU START ATTEMPTS RESULTED IN APU FAULT LIGHT ILLUMINATION. GROUNDED - YES. PER B737-9 FIM TASK 49-40-00-810-818 VERIFIED NO VISUAL DAMAGES TO STARTER AND 
- [SDR ASAA2023062843783](https://openairdocs.org/sdr/ASAA2023062843783), Jun 28, 2023: UNKNOWN. UNKNOWN. WHILE PERFORMING MTC 31-005-00 FOUND SMT MESSAGE ENG 1 EEC C2 UNDER LATCHED MESSAGE ERASE. GROUNDED - YES. C/W IFIM TASK G73-10-00-810-803. LATCHED MESSAGE ENG 
- [SDR ASAA2023062643684](https://openairdocs.org/sdr/ASAA2023062643684), Jun 26, 2023: MODULATING VALVE. OUT OF POSITION. TECH SERVICES REQUEST FOR FOLLOW-UP TO MTX LIGHT & FAULT(#1 LEFT FAMV FAULT 36-12020 #1(LH) FAMV IS NOT IN COMMANDED POSITION)----(#PRI1)----ETOPS SIGNIFICANT S
- [SDR ASAA2023052843379](https://openairdocs.org/sdr/ASAA2023052843379), May 28, 2023: UNKNOWN. UNKNOWN. IN CRUISE FL350 HAD DUAL FMC FAILURE. HAD AP P/RST AND FMC P/RST LIGHTS FLASHING ON GLARE SHIELD. WHILE GETTING QRH OUT, BOTH FMC'S RESET AND RETURNED TO NORMAL
- [SDR ASAA2023050343099](https://openairdocs.org/sdr/ASAA2023050343099), May 3, 2023: UNKNOWN. UNKNOWN. OVERHEAD AND MAINT LIGHT ILLUMINATED FOR A SHORT WHILE AFTER LANDING AND THEN WENT OUT. GROUNDED - YES. A/C LOGGED FAULT 32-62101 LEFT TRA SWITCH OPEN DURING LA
- [SDR ASAA2023032742604](https://openairdocs.org/sdr/ASAA2023032742604), Mar 27, 2023: UNKNOWN. UNKNOWN. FMC DISAGREE MSG. GROUNDED - YES. PER B737-9 IFIM 34-61-00-810-918 RESETED THE FAULTS. PERFORMED FMC OPS CHECK NORMAL REF B737-9 AMM 34-61-00-710-801.
- [SDR ASAA2023031242318](https://openairdocs.org/sdr/ASAA2023031242318), Mar 12, 2023: UNKNOWN. UNKNOWN. SUSPECTED FUEL LEAK LEFT TANK WAS DRAINING ALARMINGLY FAST. GROUNDED - YES. AIR TURNBACK -- CHECKED ALL THE BOOST PUMPS & ENGINES, NO LEAKS NOTED. ALSO RUN BOTH
- [SDR ASAA2023030942300](https://openairdocs.org/sdr/ASAA2023030942300), Mar 9, 2023: MOTOR. FAULTY. LEFT AFT FUEL PUMP "LOW PRESSURE" ILLUMINATED.(INFO: W/ 5175 LBS REMAINING IN TANK). GROUNDED - YES. REMOVED AND REPLACED LEFT AFT FUEL PUMP IAW B737-9 AMM 28-2
- [SDR ASAA2023030142353](https://openairdocs.org/sdr/ASAA2023030142353), Mar 1, 2023: SENSOR. OUT OF RANGE. DURING ASA TC 05-020-01 FOUND REPEAT ENG 2 EEC C2 FAULT. 77-43073, N2 SENSOR OUT OF RANGE. GROUNDED - YES. REMOVED AND REPLACED ENG #2 N2 SPEED SENSOR PER B737-
- [SDR ASAA2023020541833](https://openairdocs.org/sdr/ASAA2023020541833), Feb 5, 2023: NOT REPORTED. NOT REPORTED. APU OIL FILTER INDICATOR EXTENDED. GROUNDED - YES. REPLACED OIL FILTER INSPECTED MAG PLUG NO DEFECTS FOUND. RESET OIL FILTER INDICATOR. PERFORMED LEAK CHECK, NO
- [SDR ASAA2023020441823](https://openairdocs.org/sdr/ASAA2023020441823), Feb 4, 2023: NOT REPORTED. NOT REPORTED. ON TAXI IN L2 WINDOW OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. NO HISTORY- PERFORMED B737-9 IFIM 30-41-00-810-841L2 WINDOW HEAT OPS AND BITES NORMAL REF B737-
- [SDR ASAA2023020441822](https://openairdocs.org/sdr/ASAA2023020441822), Feb 4, 2023: NOT REPORTED. NOT REPORTED. ON TAXI IN L1 WINDOW OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. NO HISTORY-PERFORMED B737-9 IFIM 30-41-00-810-841L1 WINDOW HEAT OPS AND BITES NORMAL. REF MM 30
- [SDR ASAA2023020441821](https://openairdocs.org/sdr/ASAA2023020441821), Feb 4, 2023: NOT REPORTED. NOT REPORTED. ON TAXI IN R1 WINDOW OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. NO HISTORY-PERFORMED B737-9 IFIM 30-41-00-810-841R1 WINDOW HEAT OPS AND BITES NORMAL. REF B737-
- [SDR ASAA2022112840964](https://openairdocs.org/sdr/ASAA2022112840964), Nov 28, 2022: FMC. FAULTED. FMC DISAGREE BOTH SIDES. GROUNDED - YES. TROUBLESHOT PER B737-9 IFIM 34-61-00. OBSERVED FAULT CLEARED, NO FURTHER ACTION REQUIRED.
- [SDR ASAA2022110740695](https://openairdocs.org/sdr/ASAA2022110740695), Nov 7, 2022: ANTI-ICE VALVE. FAULTED. LEFT VALVE WING ANTI ICE LIGHT REMAINED ILLUMINATED WITH WAI SWITCH IN ON POSITION. GROUNDED - YES. R & R LT WING THERMAL ANTI-ICE VALVE ASSY REF B737-9 AMM 30-
- [SDR ASAA2022100440161](https://openairdocs.org/sdr/ASAA2022100440161), Oct 4, 2022: ANTI-ICE VALVE. FAULTY. DURING ENGINE RUN TEST FOUND #1 ENGINE ANTI-ICE VALVE LIGHT WOULD STAY ILLUMINATED AMBER UNTIL 68% N2 POWER, STAYS ILLUMINATED AT IDLE. GROUNDED - YES. REMOVED 
- [SDR ASAA2022092640075](https://openairdocs.org/sdr/ASAA2022092640075), Sep 26, 2022: FMC. FAILED. LEFT FMC FAILED IN CRUISE FLIGHT AT FL340. FMC RETURNED TO NORMAL OPERATION AFTER 15-20 SECONDS. GROUNDED - YES. PERFORMED GOOD OPS CHECK OF FLIGHT MANAGEMENT C
- [SDR ASAA2022082239593](https://openairdocs.org/sdr/ASAA2022082239593), Aug 22, 2022: UNKNOWN. UNKNOWN. AFTER SELECTION OF WING A-ICE TO "ON" L VALVE LIGHT ILLUMINATED WITH ASSOCIATED MASTER CAUTION. GROUNDED - YES. REF ASA FTD 30-22001 AND ASA FTD 30-18001. THIS 
- [SDR ASAA2022080839433](https://openairdocs.org/sdr/ASAA2022080839433), Aug 8, 2022: MODULATING VALVE. INOPERATIVE. AMBER OVERHEAD MAINT LIGHT ILLUMINATED AFTER LANDING. GROUNDED - YES. REMOVED AND REPLACED #1 ENG FAMV REF B737-9 AMM 36-12-03.
- [SDR ASAA2022071839125](https://openairdocs.org/sdr/ASAA2022071839125), Jul 18, 2022: CIRCUIT BREAKER. POPPED. F/O PITOT CAUTION LIGHT ILLUMINATED AT FL330. GROUNDED - YES. UPON INSPECTION FOUND C/B D5, F/O PITOT, TRIPPED. RESET C/B REFERENCE B737-9 AMM 20-60-01-860-801 
- [SDR ASAA2022062738832](https://openairdocs.org/sdr/ASAA2022062738832), Jun 27, 2022: RADAR. FALSE INDICATION. WXR FAIL MSG IN FLIGHT. GROUNDED - YES. NO HISTORY OF FAULT LAST 30 DAYS. PERFORMED WXR OPERATIONAL TEST AND NO FAULTS FOUND. BITE CK SHOWS NO FAULTS WXR SYSTEM
- [SDR ASAA2022061838694](https://openairdocs.org/sdr/ASAA2022061838694), Jun 18, 2022: WARNING LIGHT. ILLUMINATED. VTK ON F.O. SIDE FOR 30 SECONDS THEN BACK TO NORMAL. GROUNDED - YES. FOUND MAINTENACE MESSAGE: 34-69-002 NO INPUT TO FMC 2, PERFORMED B737-9 IFIM 34-61-00. MAIN

All 58: https://openairdocs.org/aircraft/N931AK/reports.md

## STCs that may be installed (OpenAirDocs) (105, first 50)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the airframe (Boeing 737-9)

- [STC ST03438NY](https://openairdocs.org/stc/ST03438NY): Installation of Adams Rite Lavatory Equipment. Delta Engineering Corporation
- [STC ST04669CH](https://openairdocs.org/stc/ST04669CH): Installation of Honeywell Advanced Communications and Entertainment System (ACES). Honeywell Aerospace
- [STC ST09941AC](https://openairdocs.org/stc/ST09941AC): Installation of a Gables SATVOICE Annunciator Panel. L2 Aviation
- [STC ST02269NY](https://openairdocs.org/stc/ST02269NY): Installation of Self Illuminating Floor Path Marking System. Lufthansa Technik AG
- [STC ST00885LA](https://openairdocs.org/stc/ST00885LA): Installation of fire extinguisher cartridges as replacements for Pacific Scientific fire extinguisher cartridges in fire extinguisher bottles. AMETEK AMERON, LLC d/b/a MASS Systems
- [STC ST12443LA](https://openairdocs.org/stc/ST12443LA): Installation of Teledyne Controls Edge Computing Platform (ECP). Teledyne Controls, LLC
- [STC ST04474NY](https://openairdocs.org/stc/ST04474NY): Activation of Wireless Local Area Network (WLAN) system. Jet Aviation AG
- [STC ST04254NY](https://openairdocs.org/stc/ST04254NY): Installation of Viasat Satcom Software. ALOFT AeroArchitects
- [STC ST09927AC](https://openairdocs.org/stc/ST09927AC): Installation of a Gables Audio Management System. L2 Aviation
- [STC ST12005SE](https://openairdocs.org/stc/ST12005SE): Installation of Starlink Aviation System. Space Exploration Technologies Corp./Starlink Aviation
- [STC ST04040CH](https://openairdocs.org/stc/ST04040CH): Activation of Smart Runway and Smart Landing (SRSL) Runway Awareness Advisory System (RAAS) Functions for Honeywell Mark V and Mark V-A Enhanced Ground Proximity Warning Systems (EGPWS). Honeywell International Inc
- [STC ST00555AT](https://openairdocs.org/stc/ST00555AT): Installation of Airshow 210 system. AIRCRAFT RECONFIG TECHNOLOGIES, LLC. Lists 737 Series
- [STC ST04384AT](https://openairdocs.org/stc/ST04384AT): Interior reconfiguration installation. AIRCRAFT RECONFIG TECHNOLOGIES, LLC
- [STC ST00952LA](https://openairdocs.org/stc/ST00952LA): Installation of Mass Systems fire extinguisher cartridges as replacements for Kidde fire extinguisher cartridges in fire extinguisher bottles. AMETEK AMERON LLC d/b/a MASS Systems
- [STC ST04328NY](https://openairdocs.org/stc/ST04328NY): The Manufacture and Installation of Exterior Placards, Labels and Signs is to be performed, installed. Libellule Monde Inc
- [STC ST03405NY](https://openairdocs.org/stc/ST03405NY): Installation (with demod option) of an Connectivity Antenna. Delta Engineering Corporation
- [STC ST04758NY](https://openairdocs.org/stc/ST04758NY): Installation of single cockpit USB charger. Eirtech Aviation Services Inc
- [STC ST09844DS](https://openairdocs.org/stc/ST09844DS): This project installs a new Next-IS media server and installation provisions to interface with the Starlink IFC system. United Airlines
- [STC ST04052NY](https://openairdocs.org/stc/ST04052NY): ViaSat KA Cabin Distribution System Installation. ALOFT AeroArchitects
- [STC ST02908NY](https://openairdocs.org/stc/ST02908NY): Installation of a Panasonic Avionics Corporation Global Communications Suite (GCS) and/or In-Flight Entertainment (IFE). Delta Engineering Corporation
- [STC ST04051NY](https://openairdocs.org/stc/ST04051NY): ViaSat KA SATCOM Antenna System Installation. ALOFT AeroArchitects
- [STC ST00030IB](https://openairdocs.org/stc/ST00030IB): Installation of Test Tech ELT. APTOZ EHF
- [STC ST03885AT](https://openairdocs.org/stc/ST03885AT): Installation of an Avionica, Inc. avCM Cellular Module. Aircraft Systems and Manufacturing Inc
- [STC ST12102IB](https://openairdocs.org/stc/ST12102IB): Installation of a Honeywell Aspire 400 SBB Satcom and/or an AMT-3800 high gain antenna. Jet Aviation AG
- [STC ST12059IB](https://openairdocs.org/stc/ST12059IB): Installation of Seat to Floor Interface - isotropic intercostals for installation of seats and divans. JET AVIATION AG
- [STC ST04243NY](https://openairdocs.org/stc/ST04243NY): Installation of the ALOFT AeroArchitects Auxiliary Fuel System (AFS). ALOFT AeroArchitects
- [STC ST04368AT](https://openairdocs.org/stc/ST04368AT): Installation of a Rockwell Collins CMU-900 ACARS/CPDLC Communication Management Unit P/N 822-1239-151 to provide Data Link communications via existing data link capable VHF Mode 2 (VDLM2), HF and/or SATCOM systems and host the CPDLC application which support EASA Link 2000+ communications. LB Aircraft Engineering Inc
- [STC ST00079IB](https://openairdocs.org/stc/ST00079IB): Integration of Halon-free Portable Fire Extinguisher HAFEX. UMLAUT ENGINEERING GMBH
- [STC ST00215IB](https://openairdocs.org/stc/ST00215IB): Installation of saf-Tglo ECO Photoluminescent Aisle Path Marking Systems. STG AEROSPACE GERMANY GmbH
- [STC ST01936WI](https://openairdocs.org/stc/ST01936WI): Installation of LED lights. AeroLED's Holdings LLC
- [STC ST09830DS](https://openairdocs.org/stc/ST09830DS): AVOD Integration on Boeing B737-9 fleet. United Airlines
- [STC ST04585AT](https://openairdocs.org/stc/ST04585AT): Installation of a Cobham AVIATOR 200S Inmarsat / Swift Broadband Satellite Communications System. Avionics Support Group
- [STC ST04071NY](https://openairdocs.org/stc/ST04071NY): Installation of VisionSafe Emergency Vision Assurance System (EVAS). VisionSafe LLC
- [STC ST03952NY](https://openairdocs.org/stc/ST03952NY): Installation of Controller-Pilot Data-Link communications. 365 Aerospace Ltd Aerospace Logistics Centre
- [STC ST03403NY](https://openairdocs.org/stc/ST03403NY): Installation of a Intelsat Cabin Connectivity (with demod option) system. Delta Engineering Corporation
- [STC ST04493AT](https://openairdocs.org/stc/ST04493AT): Interior Reconfiguration (Carpet Installation). ZIM Aircraft Cabin Solutions LLC
- [STC ST00161IB](https://openairdocs.org/stc/ST00161IB): Installation of a DK180 Underwater Locator Device (ULD) using Dukane mounting bracket. Fokker Services B.V
- [STC ST00158IB](https://openairdocs.org/stc/ST00158IB): Installation of Tablet Cradle, consisting of the installation of 2 arm mounts on the existing sliding windows (both sides, Captain and First Officer). PMV Engineering
- [STC ST04203AT](https://openairdocs.org/stc/ST04203AT): Installation of a Constant Friction Mount , Cradle, and Integrated Power Supply. Avionics Support Group Inc
- [STC ST11386DS](https://openairdocs.org/stc/ST11386DS): Installation of USB Charging Hubs on the Flight Deck. Aircraft Systems and Manufacturing Inc
- [STC ST00792NY](https://openairdocs.org/stc/ST00792NY): Installation of evacuation slide and compartment assemblies. Air Cruisers
- [STC ST00126IB](https://openairdocs.org/stc/ST00126IB): Replacement of Halon agent with alternate Halon-free Portable Fire Extinguisher agent. AMAC Aerospace Switzerland AG
- [STC ST00140IB](https://openairdocs.org/stc/ST00140IB): Installation of Potable Water Pre-Select system. International Water-Guard Industries Inc
- [STC ST04664NY](https://openairdocs.org/stc/ST04664NY): Activation of Wireless Local Area Network (WLAN) system. AMAC Aerospace AG
- [STC ST00121IB](https://openairdocs.org/stc/ST00121IB): Installation of photoluminescent floor path marking with the option to install LED lighting. Cobalt Aerospace Limited
- [STC ST04562NY](https://openairdocs.org/stc/ST04562NY): Installation of saf-Tglo® SuperSeal UltraLite-X (SSUL-X) Photoluminescent Floor Proximity Emergency Escape Path Marking Systems. STG AEROSPACE GERMANY GmbH
- [STC ST00105IB](https://openairdocs.org/stc/ST00105IB): Introduction of Activation of Wireless Charging Systems for Portable Electronic Devices. AMAC AEROSPACE SWITZERLAND AG
- [STC ST04594CH](https://openairdocs.org/stc/ST04594CH): Installation of a Viasat Cellular Data Modem (VCDM). Envoy Aerospace LLC
- [STC ST02747SE](https://openairdocs.org/stc/ST02747SE): Remove existing two (2) Branding Panels from forward monuments and install new two (2) Jamco Branding Panels on Boeing Model 737-9 aircraft. Jamco America, Inc
- [STC SA00787SE](https://openairdocs.org/stc/SA00787SE): Installation of Sliding Carpet Cargo Loading System in the cargo compartment. SBC-America LLC

All 105: https://openairdocs.org/aircraft/N931AK/stcs.md

## Related

- Other Boeing 737-9 aircraft: https://openairdocs.org/model/boeing-737-9/aircraft.md
- The CFM International LEAP-1B28 series engine: https://openairdocs.org/engine/cfm-international-leap-1b28-series.md

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