# N423CS: 2006 Cessna 525B - Status: Valid registration - Airframe: [Cessna 525B](https://openairdocs.org/model/cessna-525b) (registry code 2076616, 8 seats) - Engine: [Williams FJ44-3A](https://openairdocs.org/engine/williams-fj44-3a) (registry code 66006) - Data sheets: [TCDS A1WI](https://openairdocs.org/tcds/A1WI) (Textron Aviation Inc.), [TCDS E3GL](https://openairdocs.org/tcds/E3GL) (Williams International Company L.L.C.) (OpenAirDocs) - Serial number: 525B0121 - Year built: 2006 - Type: Fixed wing multi engine - Engine type: Turbo-fan - Airworthiness: Standard, commuter - Airworthiness date: November 30, 2006 - Certificate issued: November 13, 2025 - Expires: November 30, 2032 - Mode S code: A50707 - Registered owner: [Mountain Crest Holding LLC](https://openairdocs.org/faa-owner/MOUNTAIN%20CREST%20HOLDING%20LLC) - Location: [Whitefish, MT](https://openairdocs.org/faa-place/MT/Whitefish) - Owner type: LLC - Owner's area on the map: 48.4269° N, 114.4940° W: Placed by OpenAirDocs at the center of ZIP code 59937, within about 10 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=423CS - Page: https://openairdocs.org/aircraft/N423CS From the FAA registry file of October 21, 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): 11 in force ### Matched by airframe (Cessna 525B) - [AD 2026-03-06](https://openairdocs.org/ad/2026-03-06): Vertical Stabilizer Structure, Nacelle/Pylon, Attach Fittings · Textron 525B. Effective Mar 13, 2026 - [AD 2024-15-09](https://openairdocs.org/ad/2024-15-09): Gust Lock/Damper System · Textron 525, 525A and 525B with STC SA03842NY. Effective Oct 22, 2024 - [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 2021-05-17](https://openairdocs.org/ad/2021-05-17): NAVIGATION SYSTEM · Rockwell Collins FDSA-6500, CL-600-2B16 (CL-604), 525B and 7 more. Effective Apr 29, 2021 - [AD 2020-24-06](https://openairdocs.org/ad/2020-24-06): Flight Controls · Textron 525, 525A and 525B with STC SA03842NY. Effective Dec 28, 2020 - [AD 2014-18-01](https://openairdocs.org/ad/2014-18-01): Navigation · Bombardier ATR42-200, ATR42-300, ATR42-320 and 23 more. Effective Oct 14, 2014 - [AD 2008-03-10](https://openairdocs.org/ad/2008-03-10): Lower wing skin structure · Cessna 525, 525A and 525B. Effective Mar 11, 2008 - [AD 2007-23-16](https://openairdocs.org/ad/2007-23-16): Electrical power relay circuit protection kit · Cessna 525B. Effective Dec 19, 2007 - [AD 2005-17-11](https://openairdocs.org/ad/2005-17-11): Fire extinguisher bottles · Cessna 525, 525A and 525B. Effective Oct 7, 2005 - [AD 98-25-02](https://openairdocs.org/ad/98-25-02): Top-mounted Antenna · Bell Helicopter Textron Canada 407, 172, 172A and 243 more. Effective Dec 22, 1998 ### Matched by engine (Williams FJ44-3A) - [AD 2022-13-15](https://openairdocs.org/ad/2022-13-15): Turbine Section · Williams International FJ44-2A, FJ44-2C, FJ44-3A and 1 more. Effective Aug 9, 2022 ### Historical (superseded or no longer in force) - [AD 2019-12-09](https://openairdocs.org/ad/2019-12-09) (historical): Navigation · Bombardier CL-600-2B16 (CL-604), Flight Display System Application FDSA-6500, 525B and 13 more. Effective Jul 23, 2019 - [AD 2019-08-13](https://openairdocs.org/ad/2019-08-13) (historical): Flight Controls · Textron 525, 525A and 525B with STC SA03842NY. Effective May 24, 2019 ## Information bulletins (advisory) (1 in force) - [SAIB CE-10-49R1](https://openairdocs.org/saib/CE-10-49R1): Equipment/Furnishings Drain Mast Heater. Issued Jan 5, 2011 - [SAIB CE-10-49](https://openairdocs.org/saib/CE-10-49) (historical): Equipment/Furnishings Drain Mast Heater. Issued Sep 23, 2010 ## NTSB investigations None matched to N423CS. ## FAA accident and incident reports None matched to N423CS. ## Service difficulty reports (12) As reported by operators and repair stations. - [SDR Z5FA2012020900001](https://openairdocs.org/sdr/Z5FA2012020900001), Feb 9, 2012: CIRCUIT BOARD. DEFECTIVE. ON APPROACH, CREW NOTICED THERE WAS NO GEAR DOWN AND LOCKED INDICATION ON ANY OF THE GEAR INDICATORS. CREW DID A GO AROUND AND WAS INFORMED BY ATC THAT THE GEAR - [SDR Z5FA2011112500002](https://openairdocs.org/sdr/Z5FA2011112500002), Nov 20, 2011: SMOKE DETECTOR. INOPERATIVE. ON CLIMB OUT, BAGGAGE SMOKE WARNING ILLUMINATED. AN EMERGENCY WAS DECLARED AND THE ACFT DIVERTED. LANDING WAS UNEVENTFUL. MX FOUND THE AFT BAGGAGE COMPARTMENT S - [SDR Z5FA201111150001](https://openairdocs.org/sdr/Z5FA201111150001), Nov 15, 2011: SMOKE DETECTOR. INTERMITTENT. DURING APPROACH, BAGGAGE SMOKE ANNUNCIATOR ILLUMINATED. CREW FOLLOWED THE CHECK LIST AND DECLARED AND EMERGENCY. ACFT LANDED UNEVENTFUL. NO SIGNS OF SMOKE OR FI - [SDR Z5FA20111028002](https://openairdocs.org/sdr/Z5FA20111028002), Oct 28, 2011: INDICATION SYS. MALFUNCTIONED. ON APPROACH, CREW NOTICED THERE WAS NO GEAR DOWN AND LOCKED INDICATION ON THE LT MAIN GEAR. ABORTED APPROACH. PERFORMED MLG EMERGENCY/ABNORMAL CHECK LIST. GEAR - [SDR Z5FA201110280001](https://openairdocs.org/sdr/Z5FA201110280001), Oct 28, 2011: LANDING GEAR. MALFUNCTIONED. ON APPROACH, CREW NOTICED THERE WAS NO GEAR DOWN AND LOCKED INDICATION ON THE LT MAIN GEAR. CREW CONTACTED ATC AND ABORTED APPROACH TO WORK THE LANDING GEAR EME - [SDR Z5FA111910N423CS1](https://openairdocs.org/sdr/Z5FA111910N423CS1), Nov 19, 2010: SMOKE DETECTOR. INOPERATIVE. ABOUT 5 MINUTES FROM AIRPORT, CREW RECEIVED A BAGGAGE SMOKE INDICATION. THEY DECLARED AN EMERGENCY INTO AIRPORT. THEY LANDED UNEVENTFULLY WHERE THEY WERE MET BY - [SDR Z5FA051510N423CS1](https://openairdocs.org/sdr/Z5FA051510N423CS1), Jun 15, 2010: SMOKE DETECTOR. INTERMITTENT. ON DESCENT, AT AN ALTITUDE OF 15,000 FT. CREW RECEIVED A BAGGAGE SMOKE LIGHT INDICATION FOLLOWED BY A MASTER WARNING. CREW DECLARED AN EMERGENCY AND LANDED WITH - [SDR Z5FA052810N423CS1](https://openairdocs.org/sdr/Z5FA052810N423CS1), May 28, 2010: FIRE DETECTOR. FALSE ACTIVATION. TEN MILES OUT ON APPROACH, CREW NOTICED BAGGAGE SMOKE ANNUNCIATION, AFTER RUNNING AFM EMERGENCY CHECK LIST, CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDE - [SDR Z5FA051307N423CS1](https://openairdocs.org/sdr/Z5FA051307N423CS1), May 13, 2009: SMOKE DETECTOR. DEFECTIVE. ON APPROACH, CREW RECEIVED BAGGAGE SMOKE DETECT ANNUNCIATION. CREW ASKED ATC FOR PRIORITY TO LAND AND HAVE EMERGENCY EQUIPMENT STANDING BY. ACFT LANDED WITHOUT - [SDR Z5FA010409N423CS1](https://openairdocs.org/sdr/Z5FA010409N423CS1), Jan 4, 2009: SMOKE DETECTOR. DEFECTIVE. ENROUTE, CREW RECEIVED BAGGAGE SMOKE WARNING INDICATION. AN EMERGENCY WAS DECLARED AND ACFT DIVERTED. AFTER INSP, ON-SITE MX REPLACED FWD SMOKE DETECTOR AND OPS - [SDR 113007N423CS](https://openairdocs.org/sdr/113007N423CS), Nov 30, 2007: SMOKE DETECTOR. FALSE INDICATION. DURING CLIMB AT 15,000 FT, THE BAGGAGE SMOKE LIGHT ILLUMINATED. AIRCRAFT DIVERTED TO HPN AND MADE AN UNEVENTFUL LANDING. THE SYSTEM WAS TROUBLESHOT AND THE PROB - [SDR 101107N423CS](https://openairdocs.org/sdr/101107N423CS), Oct 11, 2007: TIRE. RUPTURED. DURING LANDING ROLL OUT, BEFORE BRAKES WERE APPLIED A SEVERE VIBRATION WAS FELT AND THE AIRCRAFT SUDDENLY PULLED TO THE RIGHT. AIRCRAFT WAS STOPPED ON A TAXIWAY ## Related - Other Cessna 525B aircraft: https://openairdocs.org/model/cessna-525b/aircraft.md - STCs for the Cessna 525B: https://openairdocs.org/model/cessna-525b/stcs.md - The Williams FJ44-3A engine: https://openairdocs.org/engine/williams-fj44-3a.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.