# N31704: 1984 Beech 1900C

- Status: Valid registration
- Airframe: [Beech 1900C](https://openairdocs.org/model/beech-1900c) (registry code 1154161, 19 seats)
- Engine: [Pratt & Whitney Canada PT6A-65B](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-65b) (registry code 52115)
- Data sheets: [TCDS A24CE](https://openairdocs.org/tcds/A24CE) (Textron Aviation Inc.), [TCDS E4EA](https://openairdocs.org/tcds/E4EA) (Pratt & Whitney Canada Corp.) (OpenAirDocs)
- Serial number: UB-12
- Year built: 1984
- Type: Fixed wing multi engine
- Engine type: Turbo-prop
- Airworthiness: Standard, normal
- Airworthiness date: July 12, 2005
- Certificate issued: April 12, 2007
- Expires: January 31, 2030
- Mode S code: A36347
- Registered owner: [Uas Transervices Inc](https://openairdocs.org/faa-owner/UAS%20TRANSERVICES%20INC)
- Location: [Boca Raton, FL](https://openairdocs.org/faa-place/FL/Boca%20Raton)
- Owner type: Corporation
- Owner's area on the map: 26.3746° N, 80.1066° W: Placed by OpenAirDocs at the center of ZIP code 33431, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=31704
- Page: https://openairdocs.org/aircraft/N31704

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): 41 in force

### Matched by airframe (Beech 1900C)

- [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 2014-02-03](https://openairdocs.org/ad/2014-02-03): Flight Controls · Textron 1900, 1900C and 1900D. Effective Mar 7, 2014
- [AD 2013-24-03](https://openairdocs.org/ad/2013-24-03): Stabilizers · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Jan 13, 2014
- [AD 2011-01-09](https://openairdocs.org/ad/2011-01-09): Oxygen · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 290 more. Effective Feb 9, 2011
- [AD 2009-23-03](https://openairdocs.org/ad/2009-23-03): Flanges · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Dec 14, 2009
- [AD 2009-23-01](https://openairdocs.org/ad/2009-23-01): Main Landing Gear · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Dec 8, 2009
- [AD 2006-18-51](https://openairdocs.org/ad/2006-18-51): Left and right wing rear spar lower caps · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Sep 8, 2006
- [AD 2005-18-21](https://openairdocs.org/ad/2005-18-21): Elevator hinge support attachments · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Sep 13, 2005
- [AD 2005-01-19](https://openairdocs.org/ad/2005-01-19): Mode S transponders · GARMIN International GTX 330D, GTX 330, GTX 33D and 830 more. Effective Feb 23, 2005
- [AD 2004-23-02](https://openairdocs.org/ad/2004-23-02): Nose Landing Gear (NLG) Fork · Textron 100, 1900, 1900C and 50 more. Effective Dec 23, 2004
- [AD 2004-17-02](https://openairdocs.org/ad/2004-17-02): Cross shaft attach bolt · Textron 100, 1900, 1900C and 52 more. Effective Oct 4, 2004
- [AD 2004-09-30](https://openairdocs.org/ad/2004-09-30): Landing Gear Electrical Power Current Limiter · Textron 1900C and 1900C (C-12J). Effective Jun 18, 2004
- [AD 2004-09-07](https://openairdocs.org/ad/2004-09-07): Canted Bulkhead Located at Fuselage Station (FS) 588.10 · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Jun 14, 2004
- [AD 2004-01-13](https://openairdocs.org/ad/2004-01-13): Vent blower assemblies · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Feb 19, 2004
- [AD 2003-20-10](https://openairdocs.org/ad/2003-20-10): Elevator Trim System Maintenance Procedures · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Oct 15, 2003
- [AD 2003-03-18](https://openairdocs.org/ad/2003-03-18): Elevator Control System · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Feb 5, 2003
- [AD 2002-23-11](https://openairdocs.org/ad/2002-23-11): Elevator Balance Weight Attachment Screws · Textron 1900, 1900C, 1900C (C-12J) and 30 more. Effective Jan 10, 2003
- [AD 2001-22-16](https://openairdocs.org/ad/2001-22-16): Engine Truss Assembly · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Dec 17, 2001
- [AD 2001-18-07](https://openairdocs.org/ad/2001-18-07): Flap Flexible Shaft Assemblies · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Oct 12, 2001
- [AD 2000-20-07](https://openairdocs.org/ad/2000-20-07): Cockpit Voice Recorder (CVR) System · Textron 1900, 1900C and 1900D. Effective Nov 22, 2000
- [AD 2000-19-04](https://openairdocs.org/ad/2000-19-04): Wing Fuel Quantity Wiring Harness · Textron 1900C, 1900C (C-12J) and 1900D. Effective Oct 31, 2000
- [AD 97-15-13 R2](https://openairdocs.org/ad/97-15-13-R2): Airstair Door Handle and Latch Housing · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective May 28, 1999
- [AD 99-04-08](https://openairdocs.org/ad/99-04-08): Main Landing Gear Hydraulic Actuators · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Mar 26, 1999
- [AD 99-01-03](https://openairdocs.org/ad/99-01-03): Flaps · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Feb 8, 1999
- [AD 98-26-16](https://openairdocs.org/ad/98-26-16): Emergency Exit Doors · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Feb 5, 1999
- [AD 98-21-20](https://openairdocs.org/ad/98-21-20): Exterior Marking Placards · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Nov 20, 1998
- [AD 97-26-15](https://openairdocs.org/ad/97-26-15): Main Landing Gear Actuator · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Jan 25, 1998
- [AD 97-25-03](https://openairdocs.org/ad/97-25-03): AFM - Limitations - Power Levers · Textron 100, 1900, 1900C and 44 more. Effective Jan 21, 1998
- [AD 97-06-06](https://openairdocs.org/ad/97-06-06): Pilot and Copilot Chairs Locking Pins · Textron 100, 1900, 1900C and 43 more. Effective May 9, 1997
- [AD 95-26-15 R1](https://openairdocs.org/ad/95-26-15-R1): Traffic Alert and Collision Avoidance Systems · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 159 more. Effective Dec 26, 1996
- [AD 96-22-12](https://openairdocs.org/ad/96-22-12): Inspect fuel filter assembly · Textron 1900C, 1900C (C-12J), 1900D and 1 more. Effective Dec 13, 1996
- [AD 96-09-13](https://openairdocs.org/ad/96-09-13): AFM - Icing · Textron 1900, 1900C, 1900D and 7 more. Effective Jun 11, 1996
- [AD 95-14-02](https://openairdocs.org/ad/95-14-02): Instrument Air System · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Aug 31, 1995
- [AD 94-20-05](https://openairdocs.org/ad/94-20-05): Hot Battery Bus · Textron 1900, 1900C, 1900C (C-12J) and 1 more. Effective Oct 14, 1994
- [AD 93-01-16](https://openairdocs.org/ad/93-01-16): Stall Warning Vane Housing · Textron 1900C and 1900C (C-12J). Effective Mar 8, 1993
- [AD 92-06-11](https://openairdocs.org/ad/92-06-11): Autopilot/Flight Director System Wiring · Textron 1900C, 300, B200 and 2 more. Effective Mar 30, 1992
- [AD 85-21-07 R1](https://openairdocs.org/ad/85-21-07-R1): POH/AFM Addendum · Textron 1900, 1900C and 1900C (C-12J). Effective Jul 10, 1987
- [AD 87-04-24](https://openairdocs.org/ad/87-04-24): Elevator Trim Cable System · Textron 1900, 1900C, 200 and 28 more. Effective Apr 14, 1987
- [AD 87-05-02](https://openairdocs.org/ad/87-05-02): POH/AFM Changes · Textron 1900, 1900C and 1900C (C-12J). Effective Mar 23, 1987

### Matched by engine (Pratt & Whitney Canada PT6A-65B)

- [AD 2004-25-18](https://openairdocs.org/ad/2004-25-18): Propeller governor assemblies · Pratt & Whitney Canada PT6A-60A and PT6A-65B. Effective Jan 18, 2005
- [AD 97-04-12](https://openairdocs.org/ad/97-04-12): Compressor Bleed-off Valve · Pratt & Whitney Canada PT6A-11, PT6A-110, PT6A-112 and 52 more. Effective Mar 14, 1997

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

- [AD 2011-27-51](https://openairdocs.org/ad/2011-27-51) (historical): Flight Controls · Hawker Beechcraft 1900, 1900C, 1900C (C-12J) and 1 more. Effective Jan 18, 2012
- [AD 2006-24-11](https://openairdocs.org/ad/2006-24-11) (historical): Forward, vertical, and aft flanges · Hawker Beechcraft 1900C, 1900C (C-12J) and 1900D. Effective Dec 11, 2006
- [AD 97-22-16](https://openairdocs.org/ad/97-22-16) (historical): Vent Blower Assembly Bearing · Raytheon 1900, 1900C, 1900C (C-12J) and 1 more. Effective Dec 5, 1997
- [AD 97-15-13 R1](https://openairdocs.org/ad/97-15-13-R1) (historical): Airstair Door Handle And Latch Housing · Raytheon 1900, 1900C and 1900D. Effective Sep 22, 1997
- [AD 97-15-13](https://openairdocs.org/ad/97-15-13) (historical): Airstair Door Handle And Latch Housing · Raytheon 1900, 1900C and 1900D. Effective Sep 5, 1997
- [AD 97-14-16](https://openairdocs.org/ad/97-14-16) (historical): Outboard Flap Attachment Brackets And Aft Roller Bearings · Raytheon 1900, 1900C and 1900D. Effective Aug 4, 1997
- [AD 97-04-02](https://openairdocs.org/ad/97-04-02) (historical): Exterior Marking Placards For Airstair And Cargo Doors · Raytheon 1900, 1900C and 1900D. Effective Mar 10, 1997
- [AD 95-02-18](https://openairdocs.org/ad/95-02-18) (historical): Engine Truss Assembly · Raytheon 1900, 1900C and 1900D. Effective Mar 25, 1995
- [AD 87-22-01 R1](https://openairdocs.org/ad/87-22-01-R1) (historical): Nose Landing Gear Fork · Raytheon 100 Model or Series (all), 1900, 1900C and 50 more. Effective Sep 30, 1989

## Information bulletins (advisory) (6 in force)

- [SAIB CE-12-36](https://openairdocs.org/saib/CE-12-36): Flight Controls: Aileron. Issued Jun 19, 2012
- [SAIB CE-05-83](https://openairdocs.org/saib/CE-05-83): . Issued Aug 26, 2005
- [SAIB CE-00-24](https://openairdocs.org/saib/CE-00-24): . Issued Jul 11, 2000
- [SAIB CE-00-15](https://openairdocs.org/saib/CE-00-15): . Issued Jan 21, 2000
- [SAIB NE-15-21](https://openairdocs.org/saib/NE-15-21): Fuel Injector Nozzle. Issued Aug 19, 2015
- [SAIB CE-03-24](https://openairdocs.org/saib/CE-03-24): . Issued Feb 19, 2003

## NTSB investigations (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CEN20LA175](https://openairdocs.org/ntsb/CEN20LA175), May 9, 2020: Beech 1900 (N31704), San Antonio, TX, substantial damage. Probable cause: The failure of the left main landing gear upper drag leg arm due to substandard mechanical properties, which resulted in a collapse of the landing gear upon landing.

## FAA accident and incident reports (10)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20200508005619A](https://openairdocs.org/incident/20200508005619A), May 8, 2020: Beech 1900C (N31704), San Antonio, TX, Substantial damage. N31704 a Beech 1900C on may 8, 2020 was on a flight from corpus christie, TX (kcrp) to San Antonio, TX (ksat). After departure from kcrp landing gear failed to…
- [Incident 19901219061109I](https://openairdocs.org/incident/19901219061109I), Dec 19, 1990: Beech 1900C (N31704), Middletown, PA. Right engine lost power. Secured. Landed safely. Replaced P3 line from filter to fuel control.
- [Incident 19901214061089I](https://openairdocs.org/incident/19901214061089I), Dec 14, 1990: Beech 1900C (N31704), State College, PA. Right engine fire warning on climbout. Secured and fired bottle. Returned. Found lip heat tubes loose. Reattached.
- [Incident 19900926049229I](https://openairdocs.org/incident/19900926049229I), Sep 26, 1990: Beech 1900C (N31704), Binghamton, NY. Unsafe cabin door light after takeoff. Returned and landed. Adjusted door micro switch.
- [Incident 19890704036579I](https://openairdocs.org/incident/19890704036579I), Jul 4, 1989: Beech 1900C (N31704), Binghamton, NY. Aborted takeoff due to engine fire warning. Deplaned without incident. Lip heat line dislodged on left engine.
- [Incident 19890107007089I](https://openairdocs.org/incident/19890107007089I), Jan 7, 1989: Beech 1900C (N31704), Pittsburgh, PA. Door annunciator light came on when pressurized. Depressurized. Light went out. Returned. Adjusted door sill switch.
- [Incident 19881228068279I](https://openairdocs.org/incident/19881228068279I), Dec 28, 1988: Beech 1900C (N31704), Johnstown, PA, Minor damage. Cabin door warning light on climbout. Airstair door departed aircraft on return. Door not found to date.
- [Incident 19880520025079I](https://openairdocs.org/incident/19880520025079I), May 20, 1988: Beech 1900C (N31704), Pittsburgh, PA. Unable to raise flaps on climb. Returned. Landed safely. Pulled circuit breaker for the flap motor as a precaution.
- [Incident 19870728052849I](https://openairdocs.org/incident/19870728052849I), Jul 28, 1987: Beech 1900C (N31704), Pittsburgh, PA, Minor damage. The engine lost power and smoke entered cabin during approach. Aircraft landed safely. Compressor bearing failure.
- [Incident 19870420038629I](https://openairdocs.org/incident/19870420038629I), Apr 20, 1987: Beech 1900C (N31704), Philadelphia, PA. Right engine surged, torque went to zero on approach. Found a valve seat had not been installed on the bleed valve.

## Service difficulty reports (10)

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 JIKA2026012301](https://openairdocs.org/sdr/JIKA2026012301), Jan 6, 2026: TRIM SYSTEM. OUT OF ALIGNMENT. DURING CLIMB, THE FLIGHT CREW NOTED THAT THE AIRCRAFT ROLLED TO THE LEFT AND REQUIRED FULL INPUT TO LEVEL OFF THE WINGS. THE CREW CALLED IT IN, AND AIR RETURNED
- [SDR JIKA20230628201](https://openairdocs.org/sdr/JIKA20230628201), Jun 22, 2023: YAW DAMPER. FAILED. AFTER DEPARTING KMFR ENROUTE TO KPDX THE FLIGHT CREW REPORTED YAW DAMPER FAILURE FOLLOWED BY AN ELECTRICAL BURNING SMELL. PILOT DECLARED AN EMERGENCY. THE AIRCR
- [SDR JIKA2023060801](https://openairdocs.org/sdr/JIKA2023060801), Jun 8, 2023: INDICATOR. FAILED. AMF1908 – ENROUTE TO KMFR PILOT DIVERTED TO KEUG DUE TO RT PROPELLER RPM FAILURE. PILOT REPORTED THAT AT CRUISE, THE RIGHT PROPELLER RPM FAILED AND DROPPED TO A
- [SDR JIKA2018011601](https://openairdocs.org/sdr/JIKA2018011601), Jan 16, 2018: TUBE. COLLAPSED. THE PILOT REPORTED THAT THE LEFT ENGINE OIL PRESSURE BEGAN FLUCTUATING NEAR THE LOW REDLINE. THE PILOT PERFORMED A PRECAUTIONARY INFLIGHT SHUT DOWN OF THE LEFT 
- [SDR JIKA2014073101](https://openairdocs.org/sdr/JIKA2014073101), Jul 31, 2014: LINE. LEAKING. ON LANDING THE PILOT REPORTED THERE WAS NO PRESS ON THE RT BRAKE. TAXIED TO PARKING WITHOUT INCIDENT. INSPECTED THE RT BRAKE SYS & FOUND THE FLEXIBLE BRAKE LINE
- [SDR JIKA2014042801](https://openairdocs.org/sdr/JIKA2014042801), Apr 28, 2014: CONNECTOR. BROKEN. ON APPROACH TO BQN PILOT SELECTED LG DOWN, RECEIVED THE RED IN TRANSIT WARNING LIGHT FOR 10 SECONDS THEN THE LIGHT WENT OUT BUT LG DID NOT EXTEND & THREE GREEN 
- [SDR JIKA2014042501](https://openairdocs.org/sdr/JIKA2014042501), Apr 25, 2014: CABLE. LOOSE. DURING APPROACH INTO BGI LG FAILED TO EXTEND WITH NO INDICATION, IN TRANSIT LIGHT, PILOT ATTEMPTED TO CYCLE LG WITH SAME RESULTS. THE PILOT MANUALLY EXTENDED LG
- [SDR JIKA2014041401](https://openairdocs.org/sdr/JIKA2014041401), Apr 14, 2014: WIRE. DAMAGED. ON APPROACH AT TLPC PILOT SELECTED LG DOWN, LG FAILED TO DEPLOY & THREE GREEN LIGHT LG POSITION INDICATORS FAIL TO ILLUMINATE. PILOT TRIED SEVERAL TIMES TO CYCL
- [SDR JIKA2014021101](https://openairdocs.org/sdr/JIKA2014021101), Feb 11, 2014: CONNECTOR. DIRTY. ON VISUAL APPROACH, PILOT SELECTED LG HANDLE DOWN, THERE WAS NO AUDIBLE REACTION TO MOVING THE HANDLE & THE GEAR HANDLE REMAINED RED WITH NO GREEN INDICATOR LIG
- [SDR 96ZZZM1415](https://openairdocs.org/sdr/96ZZZM1415), Aug 22, 1996: BATTERY. DISCHARGED. ELT BATTERY, WITH 2 MOS REMAINING UNTIL CALENDAR EXPIRATION, BEGAN LEAKING, CAUSING PLASTIC CASE TO CRACK AND DISINTEGRATE. ACID LEAKED INTO TRANSMITTER RENDERI

## STCs that may be installed (OpenAirDocs) (177, 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 (Beech 1900C)

- [STC SA01800SE](https://openairdocs.org/stc/SA01800SE): Fabrication and installation of new or replacement of existing instrument panel lights dimmer control. TCW Technologies, LLC
- [STC SA01861SE](https://openairdocs.org/stc/SA01861SE): Fabrication and installation of Landing Light Controller. TCW Technologies, LLC
- [STC SA04837NY](https://openairdocs.org/stc/SA04837NY): Installation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lights. AeroLED's Holdings, LLC
- [STC SA02019SE-D](https://openairdocs.org/stc/SA02019SE-D): Installation of Garmin Model GTN 625/635/650; 725/750 Navigation System. Garmin International Inc
- [STC SA02133SE](https://openairdocs.org/stc/SA02133SE): Installation of a Luma Technologies LT-4500 Series Integrated Light\Emitting Diode (LED) Display Panel and LT-3500 LED light modules. Luma Technologies LLC
- [STC SA12345IB](https://openairdocs.org/stc/SA12345IB): Replacement of the Halon Type 1211 portable fire extinguisher with the Halotron BrX portable fire extinguisher. Cessna Duesseldorf Citation Service Center GmbH
- [STC SA02355AK](https://openairdocs.org/stc/SA02355AK): Installation of cargo barrier net; Tednologies Inc.(TI) P/N 150A-28-000. Tednologies Inc
- [STC SA11158SC](https://openairdocs.org/stc/SA11158SC): Demonstration of aircraft tolerance to potential electromagnetic interference from certain Transmitting Potable Electronic Devices (T-PEDS). Liberty Partners Inc
- [STC SA12202IB](https://openairdocs.org/stc/SA12202IB): Installation of Garmin GWX Weather Radar System. Maxcraft Avionics Ltd
- [STC SA11300DS](https://openairdocs.org/stc/SA11300DS): Upgrade previously installed Collins Aerospace Radar Altimeter. BHE & Associates Ltd
- [STC SA6085NM](https://openairdocs.org/stc/SA6085NM): Installation of interior fluorescent cabin lighting system. Bruce Aerospace Inc
- [STC SA02738CH](https://openairdocs.org/stc/SA02738CH): Installation of L-3 Communications Avionics Systems. Acron Aviation Inc
- [STC SA106CH](https://openairdocs.org/stc/SA106CH): Installation of TCAS 791 Traffic Alert and Collision Avoidance System I (TCAS I). Acron Aviation Inc
- [STC SA8655SW](https://openairdocs.org/stc/SA8655SW): Installation of interfaced provisions only for TCAS791 Traffic Alert and Collision Avoidance System I (TCAS I). Acron Aviation Inc
- [STC ST00687DE](https://openairdocs.org/stc/ST00687DE): Installation of Tropospheric Airborne Meteorological Data Reporting (TAMDAR) System. FLYHT Inc
- [STC ST02754NY](https://openairdocs.org/stc/ST02754NY): Replacement of JET PS835C or PS835D Battery packs with Securaplane XL244-D Battery Packs. Securaplane Technologies Inc
- [STC SA02386AK](https://openairdocs.org/stc/SA02386AK): Replacement of existing landing and/or taxi light reflector and bulbs with Light Emitting Diode (LED) lighting systems. AeroLED's Holding LLC
- [STC SA00322BO](https://openairdocs.org/stc/SA00322BO): Installation of a Supplemental Exterior Lighting System. ATI Engineering Services LLC
- [STC SA04051CH](https://openairdocs.org/stc/SA04051CH): Certification of Automatic Dependent Surveillance - Broadcast (ADS-B) Out System with Rockwell Collins TDR-94/-94D Transponders. CMD Flight Solutions LLC
- [STC SA00199IB](https://openairdocs.org/stc/SA00199IB): Manufacture and Installation, Emergency Evacuation Configuration. Bartel Mechanical and Aerospace
- [STC SA01050WI](https://openairdocs.org/stc/SA01050WI): Installation of Emergency Vision Assurance System (EVAS). VisionSafe LLC. Lists 1900 Series
- [STC SA02658SE](https://openairdocs.org/stc/SA02658SE): Installation of Garmin GI 275 Multi-Function Display System. Garmin International Inc
- [STC SA00128IB](https://openairdocs.org/stc/SA00128IB): Antenna Installation and Bulkhead Feedthrough. Avmax Aviation Services Inc
- [STC SA00120IB](https://openairdocs.org/stc/SA00120IB): Installation of the Universal Kapture Cockpit Voice Recorder (CVR) with Recorder Independent Power Supply (RIPS). Avmax Aviation Services Inc
- [STC SA02821AT](https://openairdocs.org/stc/SA02821AT): Installation of a Sandel Model ST3400 Terrain Awareness and Warning System (TAWS), with optional capability as a Traffic Collision Avoidance System (TCAS) Control Display Unit (CDU) or Radio Magnetic Indicator (RMI). Woven Electronics LLC
- [STC SA13BO](https://openairdocs.org/stc/SA13BO): Installation of a Sundstrand Mark VI ground proximity warning system. Woven Electronics LLC
- [STC SA14BO](https://openairdocs.org/stc/SA14BO): Installation of a Collins ALT-55B radio altimeter. Woven Electronics LLC
- [STC SA02010WI](https://openairdocs.org/stc/SA02010WI): Installation of the Mid-Continent Instruments & Avionics MD23 FLEX Custom Function Display (CFD). Mid-Continent Instruments and Avionics
- [STC SA00741WI](https://openairdocs.org/stc/SA00741WI): Installation of the Concorde RG-380E/K series VRSLA batteries in airplanes listed on the attached FAA approved Model List (AML). Aero-Mach Wilco LLC
- [STC SA02204CH](https://openairdocs.org/stc/SA02204CH): Installation of Parker Hannifin Nose Wheel conversion Kit. Kaman Corporation Aircraft Wheel and Brake LLC
- [STC SA1789GL](https://openairdocs.org/stc/SA1789GL): Installation of Cleveland main wheels and brakes. Kaman Corporation Aircraft Wheel and Brake LLC
- [STC SA01094DE](https://openairdocs.org/stc/SA01094DE): Installation of Pratt & Whitney Engine Services FAST (digital engine management) system. Pratt & Whitney Engine Services Inc
- [STC SA02444AK](https://openairdocs.org/stc/SA02444AK): Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed. ADS-B Technologies LLC
- [STC SA02562AK](https://openairdocs.org/stc/SA02562AK): Installation of L3 Aviation Products Model FA5000 Flight Data Recorder (FDR) System. ACE Air Cargo
- [STC SA04634NY](https://openairdocs.org/stc/SA04634NY): Modification of the Brake Master Cylinder. Marsh Brothers Aviation Inc
- [STC SA04459NY](https://openairdocs.org/stc/SA04459NY): Installation of MT-Propeller Entwicklung GmbH model MTV-27-1-( )-C-F-R(P)/CFR260-65( ) 5-blade, constant speed, full feathering, reversible propellers and spinners. MT- Propeller Entwicklung GmbH
- [STC SA10236SC](https://openairdocs.org/stc/SA10236SC): Installation of a GDC 31 Roll Steering Converter. DAC International Inc
- [STC SA04514NY](https://openairdocs.org/stc/SA04514NY): Single/Dual Transponder System ADS-B Upgrade. Scandinavian Avionics Design ApS
- [STC SA02268CH](https://openairdocs.org/stc/SA02268CH): Installation of Airwolf Filter Corp. Air Oil Separator. Airwolf Filter Corporation
- [STC SA01452CH](https://openairdocs.org/stc/SA01452CH): Installation of an air ambulance conversion kit. Med-Pac Inc
- [STC SA02677LA](https://openairdocs.org/stc/SA02677LA): Modification to upgrade the existing Mode S Transponder system by installing the ACSS NXT-700 Transponder with ADS-B Out and optionally install the ACSS NXG-900 GPS as the position source for ADS-B Out. Aviation Communication and Surveillance Systems (ACSS) LLC
- [STC SA02678LA](https://openairdocs.org/stc/SA02678LA): Modification to upgrade the existing Mode S Transponder system by installing the ACSS NXT-600 Transponder with ADS-B Out and optionally install the ACSS NXG-900 GPS as the position source for ADS-B Out. Aviation Communication and Surveillance Systems (ACSS) LLC
- [STC SA01714WI](https://openairdocs.org/stc/SA01714WI): Installation of a Garmin transponders: (a) GTX 330/330D/33/33D with ADS-B Out functionality; (b) GTX 335/335R/345/345R with ADS-B Out and In functionality; or (c) GTX 335R/345R with ADS-B Out functionality in select airplanes installed with G950/G1000 systems. Garmin International Inc
- [STC SA01002DE](https://openairdocs.org/stc/SA01002DE): Installation of Garmin G700 TXi display and sensor system. Alaska Central Express Inc
- [STC SA00344BO PAGE 1](https://openairdocs.org/stc/SA00344BO%20PAGE%201): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights. Whelen Aerospace Technologies
- [STC SA01923WI](https://openairdocs.org/stc/SA01923WI): Installation of an Auxiliary Aural Alert System. Hawker Pacific Pty Ltd
- [STC SA01213CH](https://openairdocs.org/stc/SA01213CH): Install air ambulance conversion in accordance with Spectrum Aeromed Inc. Drawings as listed on AML SA01213CH, or later FAA approved revision. Spectrum Aeromed LLC dba Spectrum Aeromed
- [STC SA04165NY](https://openairdocs.org/stc/SA04165NY): Installation of Latitude Technologies Skynode S200 Satcom system must be performed. Latitude Technologies Corporation
- [STC SA01867WI](https://openairdocs.org/stc/SA01867WI): CoolView Flight Compartment Side and Storm Windows Installation. See attached AML No. SA01867WI for required data. Lee Aerospace, Inc
- [STC SA02194AK](https://openairdocs.org/stc/SA02194AK): Reduction/limitation of passenger seats to nine (9). Hageland Aviation Services, Inc

All 177: https://openairdocs.org/aircraft/N31704/stcs.md

## Earlier aircraft with N31704

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N31704 before.

- [Cancelled 1973-06-12](https://openairdocs.org/deregistered/N31704-1973-06-12): Hiller UH-12E, S/N 2175. Exported to United Kingdom. Owner: [Masin Joseph V](https://openairdocs.org/faa-owner/MASIN%20JOSEPH%20V), Rodenkirdhen

## Related

- Other Beech 1900C aircraft: https://openairdocs.org/model/beech-1900c/aircraft.md
- The Pratt & Whitney Canada PT6A-65B engine: https://openairdocs.org/engine/pratt-whitney-canada-pt6a-65b.md

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