# N504QS: 2016 Textron 680A - Status: Valid registration - Airframe: [Textron 680A](https://openairdocs.org/model/textron-680a) (registry code 2076814, 10 seats) - Engine: [Pratt & Whitney Canada PW306D1](https://openairdocs.org/engine/pratt-whitney-canada-pw306d1) (registry code 51850) - Data sheets: [TCDS T00012WI](https://openairdocs.org/tcds/T00012WI) (Textron Aviation Inc.), [TCDS E35NE](https://openairdocs.org/tcds/E35NE) (Pratt & Whitney Canada Corp.) (OpenAirDocs) - Serial number: 680A0041 - Year built: 2016 - Type: Fixed wing multi engine - Engine type: Turbo-fan - Airworthiness: Standard, transport - Airworthiness date: August 16, 2016 - Certificate issued: November 8, 2023 - Expires: November 30, 2030 - Mode S code: A64A3B - Owner type: Co-owned, fractional ownership - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=504QS - Page: https://openairdocs.org/aircraft/N504QS 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. ## ADs that may apply (OpenAirDocs): 3 in force ### Matched by airframe (Textron 680A) - [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 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 2018-07-13](https://openairdocs.org/ad/2018-07-13): Landing Gear · Textron 510, 680 and 680A. Effective May 15, 2018 ### Matched by engine (Pratt & Whitney Canada PW306D1) None in force. ## Information bulletins (advisory) None matched. ## NTSB investigations None matched to N504QS. ## FAA accident and incident reports None matched to N504QS. ## Service difficulty reports (24) 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 DXTA2026092509841](https://openairdocs.org/sdr/DXTA2026092509841), Sep 21, 2026: LIGHT. INOPERATIVE. EMERGENCY LIGHT TOE KICK SEAT 3 INOPERATIVE. REPLACED LIGHT BAR. OPS CHKD GOOD. IAW AMM 25-20-22-10. - [SDR DXTA2026090809597](https://openairdocs.org/sdr/DXTA2026090809597), Sep 7, 2026: ELEC CONNECTOR. MISINSTALLED. DURING PREFLIGHT, THE VERTICAL "EXIT" SIGN ON THE FRONT OF THE LAV DID NOT COME ON WITH THE EMER LIGHT SWITCH IN ANY POSITION. IT DID FINALLY COME WITH THE INTE - [SDR JGVR20251113001](https://openairdocs.org/sdr/JGVR20251113001), Nov 13, 2025: TUNNEL WALL. CORRODED. BLENDED CORRODED AREAS OF THE NOSE LANDING GEAR TUNNEL, PERFORMED NDT, AND REPORTED FOR REPAIR DISPOSITION. FABRICATED AND INSTALLED REPAIR DOUBLERS AS REQUIRED - [SDR DXTA2025061703913](https://openairdocs.org/sdr/DXTA2025061703913), Jun 15, 2025: HANDLE. BINDING. THE MCD HANDLE IS HARD TO OPERATE REQUIRING EXCESSIVE UPWARD FORCE ON THE HANDLE TO GET IT TO RELEASE. THE LATCH MAKES A POPPING SOUND AS THOUGH THE LOCKS ARE U - [SDR DXTA2025043003248](https://openairdocs.org/sdr/DXTA2025043003248), Apr 27, 2025: PDU. FAULTED. FLAPS FAIL AMBER CAS: FLAPS FAIL SELECTING FLAPS 2. RAN CHECKLIST AND FAILED AGAIN AFTER USING FLAP RESET. CORRECTIVE ACTION: PERFORMED FLAP SYSTEM TROUBLESHOOT - [SDR DXTA2025040402941](https://openairdocs.org/sdr/DXTA2025040402941), Apr 4, 2025: CONTROLLER. FAULTED. FLAPS FAIL AMBER CAS: AFTER TAKEOFF, FLAPS WERE SELECTED UP AT FRA (FROM FLAPS 1). FLAPS FAIL CAS POSTED AND WE FOLLOWED THE FLAP FAIL APPROACH/LANDING QRC. FLA - [SDR DXTA2025031002578](https://openairdocs.org/sdr/DXTA2025031002578), Mar 4, 2025: PROBE. DEFECTIVE. FUEL IMBALANCE AMBER CAS: IN CRUISE AT FL 400 LEFT TANK WAS 440 LBS LOWER THAN RIGHT. FUEL FLOWS WERE SAME. CROSSFED RIGHT TO LEFT TO BALANCE TANK. TOOK CROSSFE - [SDR DXTA2025012702103](https://openairdocs.org/sdr/DXTA2025012702103), Jan 25, 2025: SEAL. DIRTY. MAIN DOOR: MAIN CABIN DOOR WILL NOT FREEFALL AUTOMATICALLY WHEN TRYING TO OPEN FROM BOTH THE INSIDE AND OUTSIDE. WE HAD TO PULL IT AWAY FROM THE FRAME TO GET IT - [SDR DXTA2024013010755](https://openairdocs.org/sdr/DXTA2024013010755), Jan 30, 2024: UPLOCK SWITCH. OUT OF ADJUST. RIGHT MAIN GEAR DISAGREE ILLUMINATED DURING LANDING GEAR RETRACTION. DOWNLOADED ARIES TO TEXTRON FOR INTERROGATION OF CMC CHECKED LIVE VIEW FOR ANY WOW SWITCH I - [SDR DXTA2023110699740](https://openairdocs.org/sdr/DXTA2023110699740), Nov 4, 2023: UNKNOWN. UNKNOWN. EMERGENCY LIGHTING: ALL INTERIOR AND EXTERIOR EMERGENCY LIGHTS ARE INOP WITH THE EMER LIGHT SWITCH IN ON. USED APU AND ALLOWED THE EMERGENCY LIGHT BATTERIES TO - [SDR DXTA2023103099010](https://openairdocs.org/sdr/DXTA2023103099010), Oct 27, 2023: UNKNOWN. UNKNOWN. COLD DARK AIRPLANE. PERFORM THE EMER LIGHT TEST AND WHEN SWITCH IS MOVED TO ON ALL EMER LIGHTS IN CANIN WORK EXCEPT FOR LOWER EXIT LIGHTS AT THE MAIN CABIN DOOR - [SDR DXTA2023100497240](https://openairdocs.org/sdr/DXTA2023100497240), Oct 3, 2023: UNKNOWN. UNKNOWN. CABIN EMERG LIGHT: SEAT 10 EMERGENCY FLOOR LIGHTING INOP. PERFOMED OPERATIONAL CHECK OF THE EMERGANCY LIGHTING BATTERIES, AND DURING THE TEST IT WAS NOTED THAT - [SDR DXTA2023071490890](https://openairdocs.org/sdr/DXTA2023071490890), Jul 14, 2023: LIGHT. DEFECTIVE. EMERGENCY EXIT LIGHTING UNDER SEAT 10 WILL NOT ILLUMINATE WITH EMERGENCY LIGHT SWITCH TO ARM. WILL ILLUMINATE AT TIMES WITH PAX SAFETY SWITCH ON ON SHIPS POWER. - [SDR DXTA2021121353360](https://openairdocs.org/sdr/DXTA2021121353360), Dec 11, 2021: PROXIMITY SWITCH. DEFECTIVE. MAIN DOOR: AFTER STARTING THE FIRST ENGINE WITH THE MAIN CABIN DOOR CLOSED, THE CABIN DOOR OPEN CAS MESSAGE WOULD CYCLE ON AND OFF REPEATEDLY AND WE COULD HEAR - [SDR DXTA2021120853160](https://openairdocs.org/sdr/DXTA2021120853160), Dec 7, 2021: MONITOR. DEFECTIVE. MAIN DOOR: CABIN DOOR OPEN CAS MESSAGE WITH DOOR SOLENOID CYCLING REPEATEDLY WITH DOOR CLOSED. // SIGNOFF // POWERED UP AIRCRAFT AND OPERATED 'THE DOOR SEVERAL - [SDR DXTA2021110851520](https://openairdocs.org/sdr/DXTA2021110851520), Nov 7, 2021: RADOME. NONE. RADOME: ON TAKEOFF WE STRUCK A LARGE BIRD. SIGNIFICANT DAMAGE IS LOCATED ON THE RADOME. PART OF THE BIRDS REMAINS ARE LODGED IN THE RADOME. THE GLIDESLOPE WAS I - [SDR 2021F00203](https://openairdocs.org/sdr/2021F00203), Oct 14, 2021: SKIN. DAMAGED. TAIL CONE SKIN (LEFT SIDE) DAMAGE. ACCOMPLISHED ENGINEERING DQ31887M1 DATED OCTOBER 13TH, 2021, 680A-0041 (N504QS) TAILCONE SKIN (LEFT SIDE) DAMAGE (FASTENER RE - [SDR DXTA022520213861](https://openairdocs.org/sdr/DXTA022520213861), Feb 24, 2021: CONNECTOR. UNSECURE. FIRE DETECT FAIL L AMBER CAS: FIRE DETECT FAIL AMBER CAS ILLUMINATED FOR ABOUT 10 SECONDS UPON DESCENT INTO COLUMBUS.// SIGN OFF // UPON INITIAL INSPECTION OF L - [SDR DXTA022320213849](https://openairdocs.org/sdr/DXTA022320213849), Feb 21, 2021: LANDING GEAR. MALFUNCTIONED. GEAR DISAGREE R AMBER CAS: AIRCRAFT SAT IN SUB-FREEZING WEATHER ALL NIGHT PRIOR TO OUR DEPARTURE. AMBER GEAR DISAGREE RIGHT CAS ILLUMINATED UPON GEAR RETRACTION - [SDR DXTA022220213849](https://openairdocs.org/sdr/DXTA022220213849), Feb 21, 2021: WARNING MESSAGE. ILLUMINATED. GEAR DISAGREE R AMBER CAS: AIRCRAFT SAT IN SUB-FREEZING WEATHER ALL NIGHT PRIOR TO OUR DEPARTURE. AMBER GEAR DISAGREE RIGHT CAS ILLUMINATED UPON GEAR RETRACTION - [SDR 2020F00351](https://openairdocs.org/sdr/2020F00351), Jul 29, 2020: DOUBLER. CRACKED. CRACK DAMAGE, NOSE LANDING GEAR WHEEL WELL (NWW), FRAME, WEB, AND DOUBLERS, FS 75. ACCOMPLISHED TEXTRON AVIATION FIELD REPAIR SR-680A-ATA53-25890 REV- DATED JUN - [SDR 2020F00129](https://openairdocs.org/sdr/2020F00129), Dec 13, 2019: DRAG ANGLE. CORRODED. REPAIR TO LEFT FUSELAGE OVER-WING DRAG ANGLE CORROSION. TEXTRON AVIATION ENGINEERING REPAIR MEMO DQ24107M1 DATED DEC. 11, 2019. - [SDR DXTA2018080821212](https://openairdocs.org/sdr/DXTA2018080821212), Jul 20, 2018: PUSHROD. NOT REPORTED. AT 11000 FEET, AIRCRAFT ACCELERATING THROUGH 270 KNOTS, AIRCRAFT STARTED VIBRATING. AT 300 KNOTS YOKE STARTED BOUNCING FORWARD AND AFT 3-6 INCHES. NOTICED WINGS - [SDR DXTA201710300001](https://openairdocs.org/sdr/DXTA201710300001), Oct 28, 2017: DUCT. DAMAGED. IN FLIGHT COULD NOT CONTROL TEMPERATURES, GOT HOT, THEN A BURNING ODOR, ON TOUCH DOWN THE ACM TEMP EICAS MESSAGE WAS DISPLAYED. FOUND APU RESTRICTOR DAMAGED. RE ## STCs that may be installed (OpenAirDocs) (16) 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 (Textron 680A) - [STC ST04765NY](https://openairdocs.org/stc/ST04765NY): Unprepared (Grass/Sod) Runway Operations. Textron Aviation Inc - [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 ST12344IB](https://openairdocs.org/stc/ST12344IB): Replacement of the Halon Type 1211 portable fire extinguisher with Halotron BrX portable fire extinguisher with Halotron BrX portable fire extinguisher. Cessna Duesseldorf Citation Service Center GmbH - [STC ST122244IB](https://openairdocs.org/stc/ST122244IB): Installation of Gogo Galileo system, including HDX Antenna. Alamo Engineering GmbH - [STC ST03885AT](https://openairdocs.org/stc/ST03885AT): Installation of an Avionica, Inc. avCM Cellular Module. Aircraft Systems and Manufacturing Inc - [STC ST11983SE](https://openairdocs.org/stc/ST11983SE): Installation of Starlink Aviation System. AeroMech Incorporated - [STC ST02472AT](https://openairdocs.org/stc/ST02472AT): Installation of a mini Quick Access Recorder (QAR) model MKI, MKII, or MKIII. Aircraft Systems and Manufacturing Inc - [STC ST01117DE](https://openairdocs.org/stc/ST01117DE): Installation of the Gogo ATG C1. Peregrine - [STC ST02037WI](https://openairdocs.org/stc/ST02037WI): Installation of Gogo Business Aviation AVANCE L5 System with MB 13 Antennas. Duncan Aviation Inc - [STC ST04736NY](https://openairdocs.org/stc/ST04736NY): True Blue TS28 Emergency Battery Power Supply Replacement. Aerospace Design and Compliance LLC - [STC ST01936WI](https://openairdocs.org/stc/ST01936WI): Installation of LED lights. AeroLED's Holdings LLC - [STC ST04575AT](https://openairdocs.org/stc/ST04575AT): Installation of the Rockwell Collins ALT-1000+/ -4000+ with 5G Filtering. Chippewa Aerospace Inc - [STC ST04367CH](https://openairdocs.org/stc/ST04367CH): Installation of a Medical Interior in accordance with LifePort Master Data List EGR-887-000-001, Revision (B), dated April 18, 2019 or later FAA approved revision and LifePort Master Drawing List MDL-887-00, Revision (D), dated April 11, 2019 or later FAA approved revision.". LifePort LLC - [STC ST01027DE](https://openairdocs.org/stc/ST01027DE): Installation of MarathonNorco Aerospace Inc Nickel Cadmium battery in place of existing Nickel Cadmium main aircraft battery/batteries. MarathonNorco Aerospace Inc - [STC ST11071SC](https://openairdocs.org/stc/ST11071SC): Demonstration of aircraft critical equipment and antenna systems tolerance of radio frequency interference (RFI) from intentional or spurious transmissions from certain Portable Electronic Devices (PEDs). Liberty Partners Inc - [STC ST11168SC](https://openairdocs.org/stc/ST11168SC): Installation of a Pratt & Whitney Flight Data Acquisition, Storage, and Transmission System (FAST). Pratt & Whitney Engine Services Inc ## Related - Other Textron 680A aircraft: https://openairdocs.org/model/textron-680a/aircraft.md - The Pratt & Whitney Canada PW306D1 engine: https://openairdocs.org/engine/pratt-whitney-canada-pw306d1.md --- 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.