# N921AK: Boeing 737-9

- Status: Valid registration
- Airframe: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (registry code 138469A, 48 seats)
- Data sheets: [TCDS A16WE](https://openairdocs.org/tcds/A16WE) (The Boeing Company) (OpenAirDocs)
- Serial number: 43337
- Type: Fixed wing multi engine
- Engine type: Turbo-fan
- Certificate issued: September 27, 2021
- Expires: September 30, 2028
- Mode S code: ACC1EB
- 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=921AK
- Page: https://openairdocs.org/aircraft/N921AK

From the FAA registry file of October 27, 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.

## ADs that may apply (OpenAirDocs): 40 in force

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

- [AD 2026-21-07](https://openairdocs.org/ad/2026-21-07): Wings · Boeing 737-8, 737-9 and 737-8200. Effective Dec 1, 2026
- [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

### 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

## 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 N921AK.

## FAA accident and incident reports

None matched to N921AK.

## Service difficulty reports (64, 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 ASAA2026080867883](https://openairdocs.org/sdr/ASAA2026080867883), Aug 8, 2026: LAMP. INOPERATIVE. ROW 17ABC LOWER EMERGENCY EXIT LIGHT ASSY HAS BULBS INOP. GROUNDED - YES. RELAMPED 17ABC LWR EMERY EXIT LIGHT ASSY, OPS CHECK GOOD REF B737 AMM 33-51-04.
- [SDR ASAA2026072367850](https://openairdocs.org/sdr/ASAA2026072367850), Jul 23, 2026: TRANSITION PANEL. CORRODED. AFT CARGO COMPT RIGHT SIDE TRANSITION PANEL UPPER AND LOWER SURFACE HAS CORROSION NUMEROUS PLACE BETWEEN BS767 AND BS727J+13. GROUNDED - YES. BLENDED AWAY CORRO
- [SDR ASAA2026072367849](https://openairdocs.org/sdr/ASAA2026072367849), Jul 23, 2026: TRANSITION PANEL. CORRODED. AFT CARGO COMPT RIGHT SIDE TRANSITION PANEL UPPER AND LOWER SURFACE HAS CORROSION NUMEROUS PLACE BETWEEN BS727J+13 AND BS727+4. GROUNDED - YES. BLENDED AWAY COR
- [SDR ASAA2026072267848](https://openairdocs.org/sdr/ASAA2026072267848), Jul 22, 2026: TRANSITION PANEL. CORRODED. FWD CARGO PIT R/H TRANSITION PANEL STARTING AROUND STA 500C AND CONTINUING AFT TO REAR BULKHEAD PANEL HAS NUMEROUS AREAS OF CORROSION, GROUNDED - YES. BLENDED A
- [SDR ASAA2026072267846](https://openairdocs.org/sdr/ASAA2026072267846), Jul 22, 2026: TRANSITION PANEL. CORRODED. AFT PIT LEFT TRANSITION PANEL UPPER AND LOWER SURFACE HAS CORROSION NUMEROUS PLACE BETWEEN BS747 AND BS727J+13. GROUNDED - YES. BLENDED AWAY CORROSION, ORIGINAL
- [SDR ASAA2026072267845](https://openairdocs.org/sdr/ASAA2026072267845), Jul 22, 2026: TRANSITION PANEL. CORRODED. AFT PIT LEFT TRANSITION PANEL UPPER AND LOWER SURFACE HAS CORROSION NUMEROUS PLACE BETWEEN BS727J+13 AND BS727+4 AS MARKS. GROUNDED - YES. BLENDED AWAY CORROSIO
- [SDR ASAA2025082460418](https://openairdocs.org/sdr/ASAA2025082460418), Aug 24, 2025: LENS. DAMAGED. DURING INSPECTION FOUND EMERGENCY EXIT LENS DAMAGE AT R2 DOOR AFT G4 TRASH COMPARTMENT. SRXR430X. GROUNDED - YES. REMOVED AND REPLACED EMERGENCY EXIT LIGHT SSY 
- [SDR ASAA2025082360439](https://openairdocs.org/sdr/ASAA2025082360439), Aug 23, 2025: SEAT TRACK. DAMAGED. PILOTS SEAT TRACK INBOARD AFT HAS ELONGATED HOLE. SRXR430X. GROUNDED - YES. REMOVED AND REPLACED SEAT TRACK INBORD AFT ON PILOTSEAT IAW B737 AMM 25-11-11-400-80
- [SDR ASAA2025082360438](https://openairdocs.org/sdr/ASAA2025082360438), Aug 23, 2025: SEAT TRACK. DAMAGED. COPILOTS SEAT TRACK INBOARD AFT HAS ELONGATED HOLE. SRXR430X. GROUNDED - YES. REMOVED AND REPLACED SEAT TRACK INBOARD AFT ON COPILOTS SEAT AREA IAW B737 AMM 25-
- [SDR ASAA2024070550925](https://openairdocs.org/sdr/ASAA2024070550925), Jul 5, 2024: LIGHT. DAMAGED. FA REPORTS EMERGENCY LIGHT STRIP FROM CLOSET TO 1C IS A TRIPPING HAZARD. GROUNDED - YES. (RESOLVED ON W/O: 2006473 TASKCARD: N/R-00002 ) REVERSED MTX PROCEDURE 
- [SDR ASAA2023110746127](https://openairdocs.org/sdr/ASAA2023110746127), Nov 7, 2023: UNKNOWN. UNKNOWN. GE DIAGNOSTICS REPORTS THE #2 ENGINE IS GENERATING ALERTS FOR PS3 OUT OF RANGE, PS3 PRESSURE DISAGREE FAULT, P3B OUT OF RANGE, P3B PRESSURE DISAGREE FAULT, OR P
- [SDR ASAA2023110346010](https://openairdocs.org/sdr/ASAA2023110346010), Nov 3, 2023: UNKNOWN. UNKNOWN. OVERHEAD PANEL MAINT LIGHT ILLUMINATED. GROUNDED - YES. OMF SHOWS MAINTENANCE MESSAGE 73-44791 (EEC IS POWERED WHEN NOT COMMANDED). ACCOMPLISHED IFIM G73-21-00-
- [SDR ASAA2023102545841](https://openairdocs.org/sdr/ASAA2023102545841), Oct 25, 2023: UNKNOWN. UNKNOWN. WITH APU RUNNING NO FREQS OR VOLTS DISPLAYED. BLEED AIR WORKS. GROUNDED - YES. ACCOMPLISHED APU START PROCEDURE REF B737-9 AMM 49-11-00 ALL OPS NML WITH GOOD VO
- [SDR ASAA2023100645514](https://openairdocs.org/sdr/ASAA2023100645514), Oct 6, 2023: UNKNOWN. UNKNOWN. ON GROUND BEFORE PUSHBACK, RECEIVED "FMC DISAGREE CAUTION ON MFDS. GROUNDED - YES. RAN QRH 11.2. CONDITION CLEARED.
- [SDR ASAA2023092345255](https://openairdocs.org/sdr/ASAA2023092345255), Sep 23, 2023: UNKNOWN. UNKNOWN. MAINT LIGHT ILLUMINATED. GROUNDED - YES. MDS STATUS INDICATES APU OIL QUANTITY. OMF INDICATES 49-94304. PER IFIM 49-94304, LATCHED MESSAGE ERASED AND DOES NOT R
- [SDR ASAA2023082844810](https://openairdocs.org/sdr/ASAA2023082844810), Aug 28, 2023: UNKNOWN. UNKNOWN. CARGO FIRE WARNING PANEL DOES NOT TEST CORRECTLY. GROUNDED - YES. CLEANED HORN CUTOUT SWITCH IN MAIN WHEELWELL, IAW SWPM 20-60-01 AND OP CHECKED GOOD IAW B737-M
- [SDR ASAA2023081944678](https://openairdocs.org/sdr/ASAA2023081944678), Aug 19, 2023: UNKNOWN. UNKNOWN. WXR FAIL MSG DISPLAYED DURING CLIMB OUT. SYSTEM BEGAN TO WORK AGAIN. NO MSG DISPLAYED. GROUNDED - YES. PERFORMED WXR OPERATIONAL TEST REF B737-9 AMM 34-41-00 AS
- [SDR ASAA2023081844683](https://openairdocs.org/sdr/ASAA2023081844683), Aug 18, 2023: UNKNOWN. UNKNOWN. FMC DISAGREE. GROUNDED - YES. RESET PER QRH SUCCESSFUL.
- [SDR ASAA2023080544417](https://openairdocs.org/sdr/ASAA2023080544417), Aug 5, 2023: UNKNOWN. UNKNOWN. SPEED TRIM FAIL LIGHT ON RECALL. GROUNDED - YES. REF. IFIM 22-11-810-D73 PERFORMED AUTOTEST. PASSED SPEED TRIM FAIL LIGHT EXTINGUISHED OPS TEST GOOD.
- [SDR ASAA2023080344570](https://openairdocs.org/sdr/ASAA2023080344570), Aug 3, 2023: APU. LEAKING. VERIFICATION OF APU LEAK. GROUNDED - YES. REMOVED AND REPLACED APU PER ASA T/C 49-ASA-02 AND T/C 49-ASA-03. THIS CLOSES TSR 714736 SEA MC JEREMY NOTIFIED.
- [SDR ASAA2023080144367](https://openairdocs.org/sdr/ASAA2023080144367), Aug 1, 2023: UNKNOWN. UNKNOWN. AFT GALLEY HAS A PIZZA OVEN OR MAYBE A CAMP FIRE SMELL STARTED ON THE GROUND W/ APU ON ALL OVENS AND COFFEE MAKERS ARE OFF. TURNED CAB/UTIL AND IFE/PASS SEAT SW
- [SDR ASAA2023072244175](https://openairdocs.org/sdr/ASAA2023072244175), Jul 22, 2023: VALVE. UNKNOWN. WHILE PERFORMING NO1 ENG WASH T/C FOUND HPSOV OPEN/CLOSE LOCK BOLT HELICOIL CAME OFF. GROUNDED - YES. REMOVED AND REPLACED HPSOV WITH REF AMM 36-11-07. OPS CHEC
- [SDR ASAA2023071244002](https://openairdocs.org/sdr/ASAA2023071244002), Jul 12, 2023: UNKNOWN. UNKNOWN. APU FAULT LIGHT ILLUMINATED ON START ATTEMPT. ATTEMPTED 2 STARTS. GROUNDED - YES. UPON ARRIVAL MX PERFORMED THREE SUCCESSFUL APU STARTS. ALL INDICATIONS NORMAL.
- [SDR ASAA2023071043960](https://openairdocs.org/sdr/ASAA2023071043960), Jul 10, 2023: UNKNOWN. UNKNOWN. ALL FUNCTION OF CAPT SIDE FMC/MCDU INOP/FROZEN NO FMC FLAGS OR MAP FLAGS. GROUNDED - YES. OPENED AND CLOSED C/B'S A6 AND A7 AT P18-2 (FMCS CMPTR-1 AND FMCS CDU 
- [SDR ASAA2023070943935](https://openairdocs.org/sdr/ASAA2023070943935), Jul 9, 2023: BULB. INOPERATIVE. SLIDE/OVERWING LIGHT ON R/H SIDE BETWEEN EMERGENCY DOORS INOP. GROUNDED - YES. REMOVED AND REPLACED SLIDE/OVERWING LAMP REF B737-9 AMM 33-51-04. LIGHT FUNCTIONS
- [SDR ASAA2023062943845](https://openairdocs.org/sdr/ASAA2023062943845), Jun 29, 2023: MODULATING VALVE. FAULTY. AFTER LANDING, THE MASTER CAUTION AND AMBER "MAINT" LIGHT ON THE OVERHEAD PANEL ILLUMINATED. GROUNDED - YES. UPON NAVIGATING ONBOARD MTX COMPUTER FOUND CORRELAT
- [SDR ASAA2023062743811](https://openairdocs.org/sdr/ASAA2023062743811), Jun 27, 2023: UNKNOWN. UNKNOWN. WHILE PERFORMING T/C 05-020-01 FOUND FAULT CODE ENG 1 EEC C2 ON SMT MESSAGES. GROUNDED - YES. ON DEFERRAL.
- [SDR ASAA2023062743810](https://openairdocs.org/sdr/ASAA2023062743810), Jun 27, 2023: UNKNOWN. UNKNOWN. WHILE PERFORMING T/C 05-020-01 FOUND FAULT CODE ENG 2 EEC C2 ON SMT MESSAGES. GROUNDED - YES. ON DEFERRAL.
- [SDR ASAA2023042542999](https://openairdocs.org/sdr/ASAA2023042542999), Apr 25, 2023: UNKNOWN. UNKNOWN. CAPT FMC FAILED FOR ABOUT 20 SECONDS AND CAME BACK IN CRUISE. CAPT ND VTK. NO FMC ON MCDU'S. FMC P/RST LIGHT. ALL NORMAL BEFORE QRH COULD BE PERFORMED. GROUNDED
- [SDR ASAA2023041942929](https://openairdocs.org/sdr/ASAA2023041942929), Apr 19, 2023: UNKNOWN. UNKNOWN. WING ANTI ICE "L VALVE" LIGHT ILLUMINATED WHEN THE WING ANTI ICE WAS TURNED ON. LIGHT TURNNED OFF WHEN WING ANTI ICE WAS TURNED OFF. GROUNDED - YES. PERFORMED L
- [SDR ASAA2023041042807](https://openairdocs.org/sdr/ASAA2023041042807), Apr 10, 2023: UNKNOWN. UNKNOWN. MOMENTARY FAILURE OF LEFT FMC. IT RE-ENGAGED ON ITS OWN. GROUNDED - YES. VERIFIED L/H FMC HAD AN INTERMITTENT FAULT AT 2351Z. CYCLED PWR TO A/C ACCOMP. FMC SENS
- [SDR ASAA2023031142294](https://openairdocs.org/sdr/ASAA2023031142294), Mar 11, 2023: UNKNOWN. UNKNOWN. ENG #1 FAULT MSG 73-43850 FOUND DURING TC 05-020-01. GROUNDED - YES. NO ACTIVE MESSAGES FOUND, NO CORRELATED FLIGHT DECK EFFECTS. FOLLOWED B737-9 IFIM TASK G73-
- [SDR ASAA2023022742097](https://openairdocs.org/sdr/ASAA2023022742097), Feb 27, 2023: WINDSHIELD. FAULTY. LH FWD WINDOW HEAT. OVHT LIGHT ILLUMINATED. GROUNDED - YES. REMOVED AND REPLACED LH FWD NO 1 WINDOW PER B737-9 AMM 56-11-11.
- [SDR ASAA2023022542090](https://openairdocs.org/sdr/ASAA2023022542090), Feb 25, 2023: UNKNOWN. UNKNOWN. L FWD WINDOW OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. ACCOMPLISHED RESET PROCEDURE PER QRH. OVERHEAT LIGHT REMAINED EXTINGUISHED.
- [SDR ASAA2023022542085](https://openairdocs.org/sdr/ASAA2023022542085), Feb 25, 2023: UNKNOWN. UNKNOWN. L FWD WINDOW OVERHEAT LIGHT ILLUMINATED GROUNDED - YES. ACCOMPLISHED RESET PROCEDURE PER QRH. OVERHEAT LIGHT REMAINED EXTINGUISHED.
- [SDR ASAA2023022542076](https://openairdocs.org/sdr/ASAA2023022542076), Feb 25, 2023: UNKNOWN. UNKNOWN. L FWD WINDOW OVERHEAT LIGHT ILLUMINATED EXTINGUISHED AFTER QRH PROCEDURE. GROUNDED - YES. VERIFIED WHCU ON OVERRIDE MODE ACTIVATED TO SPARE SENSOR REF B737-9 AM
- [SDR ASAA2023022542070](https://openairdocs.org/sdr/ASAA2023022542070), Feb 25, 2023: CONTROL UNIT. FAULTY. LEFT FORWARD WINDOW OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM 30-41-00-810-828 FOR LEFT FWD WINDOW OVERHEAT LIGHT. SWAPPED WHCU PER B
- [SDR ASAA2023022442056](https://openairdocs.org/sdr/ASAA2023022442056), Feb 24, 2023: UNKNOWN. UNKNOWN. L FWD WINDOW HEAT LIGHT ILLUMINATED, EXTINGUISHED AFTER QRH PROC. GROUNDED - YES. AFTER A/C RETURN TO GATE, OBSERVED OVERHEAT LIGHT ON FOR LEFT FORWARD. ACCOMPL
- [SDR ASAA2023021841992](https://openairdocs.org/sdr/ASAA2023021841992), Feb 18, 2023: UNKNOWN. UNKNOWN. LEFT FORWARD WINDOW HEAT "AMBER OVERHEAT". EXTINGUISHED AFTER 3 MINUTE WAIT IN OFF POSITION PER QRH. GROUNDED - YES. ACCOMPLISHED RESET PROCEDURE PER QRH. LIGHT
- [SDR ASAA2023021741990](https://openairdocs.org/sdr/ASAA2023021741990), Feb 17, 2023: UNKNOWN. UNKNOWN. LEFT FWD WINDOW OVERHEAT LIGHT ILLUMINATED DURING FLIGHT DECK PREP. GROUNDED - YES. RAN QRH 3.7 OVERHEAT LIGHT EXTINGUISHED AND REMAINS EXTINGUISHED AFTER SWITC
- [SDR ASAA2023021341933](https://openairdocs.org/sdr/ASAA2023021341933), Feb 13, 2023: UNKNOWN. UNKNOWN. LEFT FRONT WINDOW OVERHEAT LIGHT. GROUNDED - YES. RAN ASA QRH 3.7, LIGHT REMAINED OFF.
- [SDR ASAA2023010841474](https://openairdocs.org/sdr/ASAA2023010841474), Jan 8, 2023: FMC. FAULT MESSAGE. MOMENTARY 30 SECOND LEFT FMC FAILURE CHANGING ALTITUDE 340 TO 360 IN VNAV WITH SPEED INTERVENTION SELECTED. GROUNDED - YES. LEFT FMC FAULTED 'PRES POS LAT RATE'
- [SDR ASAA2022122091191](https://openairdocs.org/sdr/ASAA2022122091191), Dec 19, 2022: ANTI-ICE VALVE. FAULTED. ON ARRIVAL, WING ANTI ICE WAS POSITIONED ON AND L VALVE LIGHT STAYED ILLUMINATED, MASTER CAUTION CAME ON AFTER 10 SECONDS. GROUNDED - YES. REMOVED AND REPLACED 
- [SDR ASAA2022120941089](https://openairdocs.org/sdr/ASAA2022120941089), Dec 9, 2022: ANTI-ICE VALVE. FALSE INDICATION. TURNED WING ANTI-ICE ON IN FLIGHT IN 'ICING CONDITIONS. MASTER CAUTION L VALVE ILLUMINATED, TURNED WING ANTI-ICE OFF AND LIGHT EXTINGUISHED. GROUNDED - YES. PER
- [SDR ASAA2022111440781](https://openairdocs.org/sdr/ASAA2022111440781), Nov 14, 2022: FMC. FAILED. TWICE ENROUTE FMC LEFT "FAILED" FOR 60-90 SECONDS. VTK FLAG AND MAP FLAG DISPLAYED ON LEFT ND, FMC MENU ON BOTH MCDU. RIGHT FMC ACTED NORMAL FMC "L" RECOVERED O
- [SDR ASAA2022072339184](https://openairdocs.org/sdr/ASAA2022072339184), Jul 23, 2022: FMC. INTERMITTENT. FMC DISAGREE GROUNDED - YES. PERFORMED FMC DISAGREE QRH PROCEDURE FROM ASA QRH PAGE 11.2. FMC DISAGREE MESSAGE NO LONGER DISPLAYED.
- [SDR ASAA2022062438833](https://openairdocs.org/sdr/ASAA2022062438833), Jun 24, 2022: RVDT. FAILED. ENGINE 1 SHOWS FAULT REF TC 31-005-00 BLEED FAMV RVDT SIGNAL OUT OF RANGE. 36-12030,. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM TASK 36-12-00-810-803. NO FAULTS 
- [SDR ASAA2022061138618](https://openairdocs.org/sdr/ASAA2022061138618), Jun 11, 2022: FMC. FAILED. FMC-R FAILED IN FLIGHT. GROUNDED - YES. CYCLED FMCS #1 & #2 CMPTR C/BS REF. B737-9 IFIM 34-61-00-810-918. FAULT DISAPPEARED. PERFORMED FMCS OPS TEST REF B737-9 
- [SDR ASAA2022060138542](https://openairdocs.org/sdr/ASAA2022060138542), Jun 1, 2022: TIRE. BURST. DURING TAXI INTO THE GATE RAMPERS STOPPED US SHORT. NOTIFIED US OF FLAT TIRE AND DAMAGE TO TIRE. NORMAL LANDING AND TAXI IN. AUTO BRAKE 3 WAS SELECTED FOR LANDI
- [SDR ASAA2022052538452](https://openairdocs.org/sdr/ASAA2022052538452), May 25, 2022: TRANSCEIVER. FAILED. HF 2 SHOWS " FAIL" DOES NOT TRANSMIT OR RECEIVE. GROUNDED - YES. REMOVED AND REPLACED HF#2 TRANSCEIVER REF B737-9 AMM 23-11-21. OPS CHECK GOOD. GROUND VERIFICAT

All 64: https://openairdocs.org/aircraft/N921AK/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/N921AK/stcs.md

## Related

- Other Boeing 737-9 aircraft: https://openairdocs.org/model/boeing-737-9/aircraft.md

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