# N646QS: 2021 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: 680A0261 - Year built: 2021 - Type: Fixed wing multi engine - Engine type: Turbo-fan - Airworthiness: Standard, transport - Airworthiness date: January 26, 2021 - Certificate issued: July 31, 2026 - Expires: July 31, 2033 - Mode S code: A87CF4 - Owner type: Co-owned, fractional ownership - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=646QS - Page: https://openairdocs.org/aircraft/N646QS 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 N646QS. ## FAA accident and incident reports None matched to N646QS. ## Service difficulty reports (6) 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 DXTA2026101310116](https://openairdocs.org/sdr/DXTA2026101310116), Oct 10, 2026: SQUAT SWITCH. OUT OF RIG. AFTER TAKEOFF, UPON GEAR RETRACTION WE RECEIVED THE WOW MISCOMPARE AND GEAR DISAGREE L-R-N CAS MESSAGES, THEN SHORTLY AFTER RECEIVED HP VALVE OPEN L AND GROUND - [SDR DXTA2026101210099](https://openairdocs.org/sdr/DXTA2026101210099), Oct 9, 2026: UNKNOWN. ODOR. DURING CLIMB OUT AFTER TAKEOFF DETECTED A VERY PUNGENT ODOR COMING FROM THE COCKPIT VENTS. NO FAULTS FOUND. OPS CHECK GOOD. IAW EMM 71-00-00 - [SDR DXTA2024060411968](https://openairdocs.org/sdr/DXTA2024060411968), Jun 4, 2024: BATTERY. NO TEST. EMERGENCY LIGHTS TEST FAIL. NO EMERGENCY LIGHTS COME ON WITH THE EMER LTS SWITCH IN THE ARM POSITION. ATTEMPTED TO RECHARGE EMERGENCY BATTERIES WITH TWO 30 MINU - [SDR DXTA2022100771750](https://openairdocs.org/sdr/DXTA2022100771750), Oct 7, 2022: SOLENOID. DEFECTIVE. MAIN DOOR: IN FLIGHT AT 41000 FEET GOT THE AMBER CABIN DOOR OPEN CAS MESSAGE. UPON ARRIVAL WE CYCLED THE DOOR AND STILL HAVE MESSAGE PLUS THE UNSAFE LIGHT ON DO - [SDR DXTA2022091270080](https://openairdocs.org/sdr/DXTA2022091270080), Sep 9, 2022: NONE. NONE. RIGHT MLG BRAKE: RIGHT MAIN BRAKE IS VERY SOFT. HARD TO MAINTAIN DIRECTIONAL CONTROL ON LANDING. // SIGNOFF// BLED AIR FROM THE RH IB BRAKE. NO AIR FOUND IN RH - [SDR DXTA2021032239750](https://openairdocs.org/sdr/DXTA2021032239750), Mar 22, 2021: FIRE BOTTLE. DISCHARGED. APU FIRE BOTTLE: AT FL350 IN DECENT THE WHITE FIRE BTL LOW BAG - APU CAME ON. POSSIBLE SMELL OF HALON IN AFT BAGGAGE ALSO. LEFT ENGINE FIRE DETECTION LIGHT: AT ## Service difficulty reports on N646QS not matched to an aircraft (16) They name N646QS, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft. - [SDR DXTA2023091194940](https://openairdocs.org/sdr/DXTA2023091194940), Sep 8, 2023: UNKNOWN. UNKNOWN. MAIN DOOR HANDLE: MAIN DOOR HANDLE TAKES EXCESSIVE FORCE IN LAST PART OF MOVEMENT TO GET DOOR OPEN. //SIGNOFF// PERFORMED CABIN ENTRY DOOR INSPECTION IAW CE-560 - [SDR DXTA2019022762086](https://openairdocs.org/sdr/DXTA2019022762086), Feb 26, 2019: CONTROL VALVE. FAILED. IMMEDIATELY AFTER TAKEOFF WE STARTED SMELLING A HOT BURNING DUST SMELL COMING FROM THE BACK OF THE PLANE. THE SMELL GOT MORE INTENSE SO WE CHECKED THE CABIN SUP - [SDR DXTA2018082701349](https://openairdocs.org/sdr/DXTA2018082701349), Aug 26, 2018: UNKNOWN. ODOR. ODOR DETECTED, WAS SIMILAR TO A NEW CAR MOTOR BURNING WHEN IT'S BEEN RUN FOR THE FIRST TIME AND GETS HOT. APU HAD BEEN RUNNING PRIOR TO TAKE OFF, BUT DIDN'T NOT - [SDR DXTA2017082800001](https://openairdocs.org/sdr/DXTA2017082800001), Aug 25, 2017: MOTOR. INOPERATIVE. WITH THE GEAR DOWN, FLAPS ZERO DEGREES, AIRSPEED 140 KNOTS, THROTTLES IN THE CLIMB DETENT, ALTITUDE BETWEEN 1300' TO 2000', WE HEARD AND FELT A LARGE BANG UNDER - [SDR EBVR20161223001](https://openairdocs.org/sdr/EBVR20161223001), Dec 23, 2016: SUPPORT ANGLE. CRACKED. BAGGAGE DOOR FWD SUPPORT ANGLE IS DAMAGED. COMPLIED WITH AQRD REPAIR ERO-876975 REV A DATED 12/22/2016 AND FAA FORM 8110-3. - [SDR DXTA2013040505349](https://openairdocs.org/sdr/DXTA2013040505349), Apr 4, 2013: ACTUATOR. FAILED. DURING DESCENT, AT APPROX FL290, AN AP PITCH MISTRIM ANNUNCIATION. AFTER DISCONNECTING AUTOPILOT, FOUND TRIM WOULD NOT MOVE FORWARD ELECTRICALLY OR MANUALLY. WI - [SDR DXTA2013011405244](https://openairdocs.org/sdr/DXTA2013011405244), Jan 11, 2013: PUMP. FAILED. ON LANDING, LEFT SKID WAS CYCLING ON A DRY RUNWAY WITH NORMAL APPLICATION. BRAKES SEEMED TO GRAB A LITTLE. UPON EXITING THE RUNWAY THE BRAKES FAILED. THE LOW BR - [SDR DXTR20120223002](https://openairdocs.org/sdr/DXTR20120223002), Feb 23, 2012: CASTING. LOOSE. FOUND FOUR BOLTS LOOSE AT HORIZONTAL STAB REAR ATTACH CASTING. TORQUED BOLTS IAW MM 20-10-01. - [SDR DXTR20120223001](https://openairdocs.org/sdr/DXTR20120223001), Feb 23, 2012: SKIN. CRACKED. RUDDER SKIN CRACKED ON LOWER L/E. R & R SKIN WITH NEW PN 6633000-5. - [SDR DXTA2011020904460](https://openairdocs.org/sdr/DXTA2011020904460), Feb 8, 2011: UPLOCK SWITCH. OUT OF ADJUST. LANDING GEAR JAMMED IN DOWN AND LOCKED POSITION AFTER TAKEOFF. HANDLE WOULD NOT MOVE. ADJUSTED NOSE GEAR UPLOCK SWITCH IAW MM 32-30-05, SWUNG GEAR TEN TIMES AND - [SDR DXTA2009100203803](https://openairdocs.org/sdr/DXTA2009100203803), Oct 1, 2009: ACM. INOPERATIVE. JUST AFTER ROTATION ACM O HEAT CAME ON . EMERGENCY PRESSURIZATION CAME ON WITHOUT EMER PRESS LIGHT. CABIN FILLED WITH SMOKE WITH AN OILY ODOR. DEPLOYED PAX 02 M - [SDR DXTA200702533](https://openairdocs.org/sdr/DXTA200702533), Oct 11, 2007: WARNING LIGHT. ILLUMINATED. DURING FLAP/STAB RETRACTION CYCLE RECEIVED STAB MISCOMPARE AT 203 KIAS. FOUND NOSE GEAR UPLOCK SWITCH BARELY MAKING CONTACT. ADJUSTED NOSE GEAR UP-LOCK ACTUATOR - [SDR DXTA200701835](https://openairdocs.org/sdr/DXTA200701835), Jan 3, 2007: UPLOCK SWITCH. INOPERATIVE. AFTER TAKEOFF NOSE GEAR WOULD NOT RETRACT. REMOVED AND REPLACED FAULTY NOSE LANDING GEAR UPLOCK SWITCH. OPS CHECK GOOD IAW WDM CHPT 32-60-01. - [SDR CWQR200625](https://openairdocs.org/sdr/CWQR200625), Aug 29, 2006: CONTROL CABLE. BROKEN. DURING A ROUTINE MAINTENANCE VISIT, OPERATOR REQUESTED WE INSPECT THE AFT ELEVATOR TRIM CABLES. UPON INSPECTION WE FOUND ABOUT .333 OF THE CABLE STRANDS BROKEN. - [SDR DXTA200601346](https://openairdocs.org/sdr/DXTA200601346), Apr 16, 2006: POSITION SWITCH. MALFUNCTIONED. MASTER WARNING AND RT THRUST REVERSER ARM LIGHT ILLUMINATED IN FLIGHT. REMOVED AND REPLACED BOTH RT T/R STOW SWITCHES IAW MM 78-30-11. OPERATIONAL CHECKS GOOD. - [SDR DXTA200501116](https://openairdocs.org/sdr/DXTA200501116), Nov 27, 2005: LIGHT. INOPERATIVE. DURING FLIGHT, DISCOVERED LEFT CABIN TABLE AND READING LTS INOP. LEFT FLOOR DROP DOWN LIGHTS INOP, LIQUID HOT PLUS COLD CONTAINERS INOP. ALSO DIVIDER SWITCHES H ## 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.