# N921FX: 1992 Aerospatiale/Aeritalia ATR 42-300

- Status: Valid registration
- Airframe: [Aerospatiale/Aeritalia ATR 42-300](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-300) (registry code 8680920, 50 seats)
- Engine: [Pratt & Whitney Canada PW120](https://openairdocs.org/engine/pratt-whitney-canada-pw120) (registry code 52114)
- Data sheets: [TCDS A53EU](https://openairdocs.org/tcds/A53EU) (ATR – GIE Avions de Transport Régional), [TCDS E20NE](https://openairdocs.org/tcds/E20NE) (Pratt & Whitney Canada Corp.) (OpenAirDocs)
- Serial number: 319
- Year built: 1992
- Type: Fixed wing multi engine
- Engine type: Turbo-prop
- Airworthiness: Experimental, research and development, showing compliance
- Airworthiness date: May 11, 2009
- Certificate issued: May 25, 2004
- Expires: August 31, 2027
- Mode S code: ACC274
- Registered owner: [Federal Express Corp](https://openairdocs.org/faa-owner/FEDERAL%20EXPRESS%20CORP)
- Location: [Memphis, TN](https://openairdocs.org/faa-place/TN/Memphis)
- Owner type: Corporation
- Owner's area on the map: 35.0254° N, 89.7893° W: Placed by OpenAirDocs at the center of ZIP code 38125, 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=921FX
- Page: https://openairdocs.org/aircraft/N921FX

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): 158 in force

### Matched by airframe (Aerospatiale/Aeritalia ATR 42-300)

- [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 2026-09-13](https://openairdocs.org/ad/2026-09-13): Flight controls · ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Jun 18, 2026
- [AD 2025-26-01](https://openairdocs.org/ad/2025-26-01): Time Limits/Maintenance Checks · ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Feb 9, 2026
- [AD 2025-24-09](https://openairdocs.org/ad/2025-24-09): Ice and rain protection · ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Jan 13, 2026
- [AD 2025-23-04](https://openairdocs.org/ad/2025-23-04): Fire Protection · ATR – GIE Avions de Transport Régional ATR42-300, ATR42-320, ATR42-500 and 6 more. Effective Jan 13, 2026
- [AD 2025-12-02](https://openairdocs.org/ad/2025-12-02): Equipment/furnishings · Ipeco Holdings 3A063-0100-( )-( ), 3A063-0080-( )-( ), 3A063-0038-( )-( ) and 18 more. Effective Jun 30, 2025
- [AD 2025-10-06](https://openairdocs.org/ad/2025-10-06): Time Limits/Maintenance Checks · ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Jun 26, 2025
- [AD 2025-05-11](https://openairdocs.org/ad/2025-05-11): Fire protection · ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Apr 22, 2025
- [AD 2025-04-06](https://openairdocs.org/ad/2025-04-06): Flight controls · ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Apr 4, 2025
- [AD 2025-02-10](https://openairdocs.org/ad/2025-02-10): Doors · ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Mar 19, 2025
- [AD 2024-23-10](https://openairdocs.org/ad/2024-23-10): Placards and Marking · Decompression Panel (Aeroconseil STC ST04602NY). Effective Jan 13, 2025
- [AD 2024-19-15](https://openairdocs.org/ad/2024-19-15): Oxygen · Safran Aerosystems Oxygen Cylinder, Valve Assembly, Oxygen Valve and 103 more. Effective Nov 26, 2024
- [AD 2024-15-14](https://openairdocs.org/ad/2024-15-14): Instruments · ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Oct 23, 2024
- [AD 2024-08-02](https://openairdocs.org/ad/2024-08-02): Electrical power · ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Jun 6, 2024
- [AD 2024-05-05](https://openairdocs.org/ad/2024-05-05): Fire Protection · ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Mar 29, 2024
- [AD 2023-17-01](https://openairdocs.org/ad/2023-17-01): Landing gear · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Oct 19, 2023
- [AD 2023-14-10](https://openairdocs.org/ad/2023-14-10): Flight Compartment Equipment · Ipeco Holdings Pilot and Co-Pilot seats, ATR42-200, ATR42-300 and 9 more. Effective Sep 7, 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 2021-24-07](https://openairdocs.org/ad/2021-24-07): Fire protection · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Nov 22, 2021
- [AD 2021-22-07](https://openairdocs.org/ad/2021-22-07): Fire Bottle, Portable · Airbus A319-111, A319-112, A319-113 and 127 more. Effective Nov 18, 2021
- [AD 2021-12-17](https://openairdocs.org/ad/2021-12-17): Fuselage · ATR - GIE Avions de Transport Régional ATR42-300, ATR42-320, ATR42-500 and 7 more. Effective Aug 4, 2021
- [AD 2021-07-04](https://openairdocs.org/ad/2021-07-04): Ice and Rain Protection. · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective May 10, 2021
- [AD 2020-07-11](https://openairdocs.org/ad/2020-07-11): Hydraulic power and Electronic common installation · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective May 18, 2020
- [AD 2019-07-03](https://openairdocs.org/ad/2019-07-03): Cabin Equipment/Furnishings · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective May 16, 2019
- [AD 2018-25-18](https://openairdocs.org/ad/2018-25-18): Landing gear · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Jan 22, 2019
- [AD 2018-23-01](https://openairdocs.org/ad/2018-23-01): Cabin Equipment/Furnishings · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Dec 28, 2018
- [AD 2018-21-09](https://openairdocs.org/ad/2018-21-09): Wings · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 1 more. Effective Nov 20, 2018
- [AD 2018-19-15](https://openairdocs.org/ad/2018-19-15): Cabin Equipment/Furnishings · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Nov 14, 2018
- [AD 2017-25-15](https://openairdocs.org/ad/2017-25-15): Ice and Rain Potection · ATR - GIE Avions de Transport Régional ATR42-300, ATR42-500, ATR72-202 and 1 more. Effective Jan 2, 2018
- [AD 2017-17-10](https://openairdocs.org/ad/2017-17-10): Landing Gear · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 1 more. Effective Sep 29, 2017
- [AD 2015-11-03](https://openairdocs.org/ad/2015-11-03): Fuel · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Jul 14, 2015
- [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 2014-17-02](https://openairdocs.org/ad/2014-17-02): Communications · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 137 more. Effective Sep 9, 2014
- [AD 2014-06-09](https://openairdocs.org/ad/2014-06-09): Windows · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective May 8, 2014
- [AD 2014-03-09](https://openairdocs.org/ad/2014-03-09): Nacelles/pylons · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Mar 26, 2014
- [AD 2012-08-07](https://openairdocs.org/ad/2012-08-07): Equipment/Furnishings · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective May 9, 2012
- [AD 2011-23-10](https://openairdocs.org/ad/2011-23-10): Stabilizers · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Dec 15, 2011
- [AD 2011-21-08](https://openairdocs.org/ad/2011-21-08): Equipment/Furnishings · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 202 more. Effective Nov 23, 2011
- [AD 2011-21-05](https://openairdocs.org/ad/2011-21-05): Equipment/Furnishings · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Oct 27, 2011
- [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 2010-05-01](https://openairdocs.org/ad/2010-05-01): Fire Protection · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Mar 12, 2010
- [AD 2010-02-06](https://openairdocs.org/ad/2010-02-06): Equipment/Furnishings · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Feb 24, 2010
- [AD 2009-12-09](https://openairdocs.org/ad/2009-12-09): Electrical power · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Jul 16, 2009
- [AD 2008-17-19](https://openairdocs.org/ad/2008-17-19): Main Landing gear · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Nov 3, 2008
- [AD 2008-13-24](https://openairdocs.org/ad/2008-13-24): Aileron tab bellcrank assemblies · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 7 more. Effective Aug 12, 2008
- [AD 2008-13-19](https://openairdocs.org/ad/2008-13-19): Pitot probe · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Aug 6, 2008
- [AD 2008-04-13](https://openairdocs.org/ad/2008-04-13): Fuel tank safety · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Mar 28, 2008
- [AD 2007-12-20](https://openairdocs.org/ad/2007-12-20): Bonding cable and electrical wires · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Jul 19, 2007
- [AD 2006-16-08](https://openairdocs.org/ad/2006-16-08): Locking bolt of the upper attachment pin · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Aug 23, 2006
- [AD 2006-07-19](https://openairdocs.org/ad/2006-07-19): Protective ramps on trim panel 110VU · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective May 12, 2006

### Matched by engine (Pratt & Whitney Canada PW120)

- [AD 2015-20-03](https://openairdocs.org/ad/2015-20-03): Fuel nozzle and the fuel manifold flow adapter · Pratt & Whitney Canada PW120, PW121, PW121A and 6 more. Effective Nov 18, 2015
- [AD 2012-26-08](https://openairdocs.org/ad/2012-26-08): Propeller shafts · Pratt & Whitney Canada PW118, PW118A, PW118B and 20 more. Effective Feb 15, 2013
- [AD 2006-19-06](https://openairdocs.org/ad/2006-19-06): Propeller shaft · Pratt & Whitney Canada PW118, PW118A, PW118B and 14 more. Effective Sep 29, 2006
- [AD 2003-21-03](https://openairdocs.org/ad/2003-21-03): Low pressure rotor speed (NL) sensor · Pratt & Whitney Canada PW118, PW120, PW120A and 1 more. Effective Nov 20, 2003
- [AD 2003-16-04](https://openairdocs.org/ad/2003-16-04): Fuel heaters · Pratt & Whitney Canada PW118, PW118A, PW118B and 19 more. Effective Sep 10, 2003
- [AD 98-14-02](https://openairdocs.org/ad/98-14-02): Fuel Manifold Transfer Tubes · Pratt & Whitney Canada PW118, PW118A, PW118B and 17 more. Effective Aug 31, 1998
- [AD 97-17-05](https://openairdocs.org/ad/97-17-05): Gas Generator Case Drain Ports · Pratt & Whitney Canada PW118, PW118A, PW118B and 17 more. Effective Sep 9, 1997
- [AD 94-03-02](https://openairdocs.org/ad/94-03-02): High Pressure Turbine Disks · Pratt & Whitney Canada PW118, PW118A, PW120 and 5 more. Effective Feb 16, 1994
- [AD 92-01-08](https://openairdocs.org/ad/92-01-08): High Pressure Rotor · Pratt & Whitney Canada PW118, PW118A, PW120 and 5 more. Effective Jul 27, 1992
- [AD 91-06-02](https://openairdocs.org/ad/91-06-02): Turbomachinery Magnetic Chip Detector · Pratt & Whitney Canada PW118, PW118A, PW120 and 6 more. Effective Mar 29, 1991
- [AD 91-01-03](https://openairdocs.org/ad/91-01-03): Hydromechanical Fuel Control Units · Pratt & Whitney Canada JT15D-5, PW118, PW118A and 3 more. Effective Jan 7, 1991
- [AD 88-26-51](https://openairdocs.org/ad/88-26-51): High Pressure Turbine Components · Pratt & Whitney Canada PW118, PW118A, PW120 and 2 more. Effective Sep 22, 1989

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

- [AD 2023-13-11](https://openairdocs.org/ad/2023-13-11) (historical): Oxygen · AVOX Systems Oxygen valve assemblies (body and gage assemblies), Oxygen cylinder and valve assemblies, A300 B2-1A and 102 more. Effective Sep 5, 2023
- [AD 2023-10-08](https://openairdocs.org/ad/2023-10-08) (historical): Time Limits/Maintenance Checks · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Jul 11, 2023
- [AD 2022-25-16](https://openairdocs.org/ad/2022-25-16) (historical): Time Limits/Maintenance Checks · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Jan 23, 2023
- [AD 2022-04-09](https://openairdocs.org/ad/2022-04-09) (historical): Oxygen System · Airbus A300 B2-1A, A300 B2-1C, A300 B2K-3C and 94 more. Effective Apr 4, 2022
- [AD 2021-17-02](https://openairdocs.org/ad/2021-17-02) (historical): Instruments · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Oct 5, 2021
- [AD 2020-23-13](https://openairdocs.org/ad/2020-23-13) (historical): Instruments · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Dec 3, 2020
- [AD 2020-09-16](https://openairdocs.org/ad/2020-09-16) (historical): Time Limits/Maintenance Checks · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Jun 22, 2020
- [AD 2018-18-05](https://openairdocs.org/ad/2018-18-05) (historical): Time limits/maintenance checks · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Oct 5, 2018
- [AD 2015-26-09](https://openairdocs.org/ad/2015-26-09) (historical): Fuselage and Wings · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 1 more. Effective Feb 17, 2016
- [AD 2015-23-12](https://openairdocs.org/ad/2015-23-12) (historical): Landing gear · ATR - GIE Avions de Transport R gional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Dec 29, 2015
- [AD 2013-18-09](https://openairdocs.org/ad/2013-18-09) (historical): Communications · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 137 more. Effective Oct 3, 2013
- [AD 2011-23-06](https://openairdocs.org/ad/2011-23-06) (historical): Equipment/Furnishings · ATR  GIE Avions de Transport R gional ATR42-200, ATR42-300, ATR42-320 and 9 more. Effective Nov 21, 2011
- [AD 2008-04-19 R1](https://openairdocs.org/ad/2008-04-19-R1) (historical): Fuel · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Nov 18, 2009
- [AD 2009-18-18](https://openairdocs.org/ad/2009-18-18) (historical): Windows · ATR - GIE Avions de Transport R gional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Sep 24, 2009
- [AD 2008-04-19](https://openairdocs.org/ad/2008-04-19) (historical): Fuel tank system · ATR  GIE Avions de Transport R gional ATR42-200, ATR42-300, ATR42-320 and 8 more. Effective Apr 3, 2008
- [AD 2006-07-26](https://openairdocs.org/ad/2006-07-26) (historical): Outer wing boxes · ATR - GIE Avions de Transport R gional ATR42-200, ATR42-300, ATR42-320 and 1 more. Effective May 16, 2006
- [AD 2001-16-10](https://openairdocs.org/ad/2001-16-10) (historical): Airplane Flight Manual--De-icing or Anti-icing Fluids · Aerospatiale ATR42-200, ATR42-300, ATR42-320 and 2 more. Effective Sep 26, 2001
- [AD 2000-17-09](https://openairdocs.org/ad/2000-17-09) (historical): Fatigue Cracking · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300 and ATR42-320. Effective Oct 11, 2000
- [AD 2000-05-26](https://openairdocs.org/ad/2000-05-26) (historical): Cargo Door Hinges · ATR  GIE Avions de Transport R gional ATR42-200, ATR42-300 and ATR42-320. Effective Apr 26, 2000
- [AD 97-26-19](https://openairdocs.org/ad/97-26-19) (historical): Lower Lugs Of Barrel Of Main Landing Gear · ATR  GIE Avions de Transport R gional ATR42-300 and ATR42-320. Effective Jan 7, 1998
- [AD 97-04-09](https://openairdocs.org/ad/97-04-09) (historical): Main Landing Gear · ATR  GIE Avions de Transport R gional ATR42-300 and ATR42-320. Effective Mar 7, 1997
- [AD 74-08-09 R2](https://openairdocs.org/ad/74-08-09-R2) (historical): Waste Receptacles · Aero Spacelines 377, 377MG, 377SGT and 268 more. Effective Jul 29, 1996
- [AD 93-18-04](https://openairdocs.org/ad/93-18-04) (historical): Fuselage Frame Inspection · ATR  GIE Avions de Transport R gional ATR42-300 and ATR42-320. Effective Nov 18, 1993
- [AD 90-19-06](https://openairdocs.org/ad/90-19-06) (historical): Main Landing Gear · ATR  GIE Avions de Transport R gional ATR42-300 and ATR42-320. Effective Oct 23, 1990
- [AD 2014-14-02](https://openairdocs.org/ad/2014-14-02) (historical): O-ring seal · Pratt & Whitney Canada PW120, PW121, PW121A and 6 more. Effective Aug 15, 2014
- [AD 2012-11-14](https://openairdocs.org/ad/2012-11-14) (historical): Propeller shafts · Pratt & Whitney Canada PW118, PW118A, PW118B and 20 more. Effective Jul 20, 2012

All 184: https://openairdocs.org/aircraft/N921FX/ads.md

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

- [SAIB NM-11-45](https://openairdocs.org/saib/NM-11-45): Doors: Cargo/Baggage Doors. Issued Aug 1, 2011
- [SAIB NM-11-19](https://openairdocs.org/saib/NM-11-19): Indicating/Recording System  Angle of Attack Sensors. Issued Feb 3, 2011
- [SAIB NM-10-18](https://openairdocs.org/saib/NM-10-18): Instruments: Redesigned Aileron Sensors for Flight Data Recorder. Issued Mar 4, 2010
- [SAIB NM-10-13](https://openairdocs.org/saib/NM-10-13): Navigation: Flight Management System. Issued Jan 7, 2010
- [SAIB NM-09-03](https://openairdocs.org/saib/NM-09-03): Engine Fuel and Control - Implementing Fuel Tank System Airworthiness Limitations. Issued Dec 11, 2008
- [SAIB NE-06-38](https://openairdocs.org/saib/NE-06-38): . Issued Apr 7, 2006

## NTSB investigations

None matched to N921FX.

## FAA accident and incident reports

None matched to N921FX.

## Service difficulty reports (95, 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 COEA2026100802921](https://openairdocs.org/sdr/COEA2026100802921), Oct 7, 2026: VSI. FAILED. FLIGHT 7275 ICT-AFW DISCREPANCY: DUAL AC BUS FAILURE IN FLIGHT. CREW EXECUTED THE EMERGENCY CHECKLIST, RESTORING POWER TO THE FO'S SIDE. THE CAPTAIN'S SIDE REMA
- [SDR COEA2026100101921](https://openairdocs.org/sdr/COEA2026100101921), Sep 29, 2026: PITOT TUBE. BLOCKED. FLIGHT 4275 AFW-ICT/AIR TURNBACK. CAPTAIN SIDE AIRSPEED SHOWED ZERO SHORTLY AFTER TAKEOFF. AIRCRAFT WAS RETURNED TO THE RAMP. NO EMERGENCY WAS DECLARED. LANDED 
- [SDR COEA2025071002921](https://openairdocs.org/sdr/COEA2025071002921), Jul 7, 2025: SKIN. GROUND DAMAGE. DURING UNLOADING OF FLIGHT 7820, THE BELT LOADER MADE CONTACT WITH THE AIRCRAFT. DISCREPANCY: LOWER L/H LATERAL SKIN PANEL BETWEEN FRAMES 36-37 AND STRINGERS 16
- [SDR COEA2025061901921](https://openairdocs.org/sdr/COEA2025061901921), Jun 17, 2025: FAIRING. CRACKED. WO 268586 NR 3 DISCREPANCY: #1 ENGINE NACELLE L/H LOWER COWL OUTBOARD BEAM CRACKS DISCOVERED DURING ROUTINE INSPECTION. A SUPPLEMENTAL SDR WILL BE SUBMITTED FOR
- [SDR COEA2024121007921](https://openairdocs.org/sdr/COEA2024121007921), Aug 28, 2024: SKIN PANEL. DENTED. WO 256296 NR 3 HEAVY CHECK COE/MAJOR REPAIR: R/H EXTERNAL SKIN AND INTERNAL STRINGER 6R ARE DENTED BETWEEN FRAMES 20-22. CORRECTIVE ACTION: REPAIRED PER SRAS ES
- [SDR COEA2024102304921](https://openairdocs.org/sdr/COEA2024102304921), Aug 6, 2024: SKIN PANEL. DENTED. WO 256293 NR 200068 HEAVY CHECK COE/MAJOR REPAIR DISCREPANCY: DENT AT R/H EXTERNAL FUSELAGE FRAME 17 BETWEEN STRINGERS 14R AND 15R. CORRECTIVE ACTION: REPAIRED 
- [SDR COEA2024102303921](https://openairdocs.org/sdr/COEA2024102303921), Aug 6, 2024: SUPPORT. CORRODED. WO 256293 NR 200063 HEAVY CHECK COE/MAJOR REPAIR DISCREPANCY: INTERNAL FUSELAGE, CPT'S SIDE OF COCKPIT CONTROL COLUMN SUPPORT HAS LEVEL 2 CORROSION AROUND ONE S
- [SDR COEA2024102302921](https://openairdocs.org/sdr/COEA2024102302921), Aug 6, 2024: FLOORBEAM. CORRODED. WO 256293 NR 200062 HEAVY CHECK COE/MAJOR REPAIR DISCREPANCY: INTERNAL FUSELAGE, CPT'S SIDE OF COCKPIT FLOORBEAM 7 HAS LEVEL 2 CORROSION BETWEEN OUTBOARD SIDEWA
- [SDR COEA2024111905921](https://openairdocs.org/sdr/COEA2024111905921), Jul 30, 2024: SEAT TRACK. CORRODED. WO 256293 NR 200014 HEAVY CHECK COE/MAJOR REPAIR: INTERIOR FUSELAGE L/H INBOARD SEAT TRACK UPPER SURFACE HAS LEVEL 2 CORROSION AT FLOORBEAM 14. CORRECTIVE ACTIO
- [SDR COEA2024102301921](https://openairdocs.org/sdr/COEA2024102301921), Jul 30, 2024: THRESHOLD. CORRODED. WO 256293 NR 100011 HEAVY CHECK COE/MAJOR REPAIR DISCREPANCY: INTERIOR FUSELASE FRAMES 36-39 L/H AFT PAX DOOR THRESHOLD UPPER SURFACE HAS LEVEL 2 CORROSION. COR
- [SDR COEA2024111906921](https://openairdocs.org/sdr/COEA2024111906921), Jul 28, 2024: DEFLECTOR. CHAFED. WO 256293 NR 500012 HEAVY CHECK COE/MAJOR REPAIR: L/H WING OUTBOARD FLAP INBOARD OF RIB 23, FLAP DEFLECTOR HAS CHAFE DAMAGE. CORRECTIVE ACTION: REPAIRED PER ATR
- [SDR COEA2022090607921](https://openairdocs.org/sdr/COEA2022090607921), Jun 22, 2022: FITTING. CRACKED. WO 240087 NR 9 HEAVY CHECK COE/MAJOR REPAIR: R/H NODE 3 UPPER FWD FITTING IS CRACKED. CORRECTIVE ACTION: REPAIR PER SRAS ES_0163526_01...19446 ISSUE A, DATED 9/
- [SDR COEA2022090606921](https://openairdocs.org/sdr/COEA2022090606921), Jun 22, 2022: FITTING. DAMAGED. WO 240087 NR 8 HEAVY CHECK COE/MAJOR REPAIR: TWO FASTENER HOLES COMMON TO L/H NODE 3 SILL AND UPPER FITTINGS HAVE FLAW INDICATION. REPAIR PER SRAS ES_0163526_01
- [SDR COEA2022080404921](https://openairdocs.org/sdr/COEA2022080404921), Jun 22, 2022: PANEL. DELAMINATED. WO 238451 NR 300021 HEAVY CHECK COE/MAJOR REPAIR: VERTICAL STABILIZER R/H PANEL VOR ANTENNA ADAPTER PLATE AFT LOWER MOUNTING SCREW INSERT DELAMINATED. CORRECTIV
- [SDR COEA2022080403921](https://openairdocs.org/sdr/COEA2022080403921), Jun 15, 2022: PANEL. CORRODED. WO 238451 NR 600006 HEAVY CHECK COE/MAJOR REPAIR: UPPER CENTER WING CUTOUT BETWEEN RIBS 4R AND 5R FLANGE FOR PANEL 622CT AND FOIL HAVE FRETTING. CORRECTIVE ACTI
- [SDR COEA2022080402921](https://openairdocs.org/sdr/COEA2022080402921), Jun 15, 2022: PANEL. CORRODED. WO 238451 NR 500006 HEAVY CHECK COE/MAJOR REPAIR: UPPER CENTER WING CUTOUT BETWEEN RIBS 4L AND 5L FLANGE FOR PANEL 522CT AND FOIL HAVE FRETTING. CORRECTIVE ACTI
- [SDR COEA2022080401921](https://openairdocs.org/sdr/COEA2022080401921), Jun 15, 2022: PANEL. DENTED. WO 238451 NR 500005 HEAVY CHECK COE/MAJOR REPAIR: UPPER CENTER WING CUT OUT BETWEEN RIBS 1L & 2L FLANGE FOR PANEL 521DT & FOIL HAVE FRETTING. CORRECTIVE ACTION:
- [SDR COEA2022080405921](https://openairdocs.org/sdr/COEA2022080405921), Jun 13, 2022: DOOR. DENTED. WO 238451 NR 800001 HEAVY CHECK COE/MAJOR REPAIR: AFT CARGO DOOR LOWER PAN IS DENTED BY THE AFT CORNER. CORRECTIVE ACTION: REPAIR PER ATR42 SRM 521100-300-811-A
- [SDR COEA2020062401921](https://openairdocs.org/sdr/COEA2020062401921), May 23, 2020: FLOORBEAM. CRACKED. LEFT LONGITUDINAL FLOORBEAM CRACKED AFT OF FRAME 24. REPAIRED PER E.O. 5315-01.
- [SDR COEA2020062506921](https://openairdocs.org/sdr/COEA2020062506921), May 20, 2020: CHANNEL. CORRODED. WO 213635 NR 600020 HEAVY CHECK COE/MINOR REPAIR: R/H AILERON TAB CLOSING CHANNEL HAS LEVEL 2 CORROSION. CORRECTIVE ACTION: REPLACED WITH OEM PART.
- [SDR COEA2020062505921](https://openairdocs.org/sdr/COEA2020062505921), May 20, 2020: CHANNEL. CORRODED. LEFT AILERON TAB CLOSING CHANNEL WAS LEVEL 2 CORROSION, AND CRACKED. REPLACED WITH OEM PART.
- [SDR COEA2020062402921](https://openairdocs.org/sdr/COEA2020062402921), May 20, 2020: MOUNT BRACKET. CORRODED. LEFT AILERON TAB ACTUATOR MOUNT BRACKET HAD CORROSION. REPLACED WITH OEM PART.
- [SDR COEA2020062504921](https://openairdocs.org/sdr/COEA2020062504921), May 18, 2020: STRINGER. CRACKED. STRINGER 1L WAS CRACKED AT FRAME 17 DRAIN HOLE. REPAIRED PER SRM 530000-300-826-A01.
- [SDR COEA2020062403921](https://openairdocs.org/sdr/COEA2020062403921), May 18, 2020: BEAM. CORRODED. FLAP BEAM AT RIB 13R HAD CORROSION ON OUTBOARD SURFACE. REPAIRED IAW ES_0120046_01.16321 ISSUE A.
- [SDR COEA2018092014921](https://openairdocs.org/sdr/COEA2018092014921), Aug 27, 2018: STRAP. DAMAGED. HEAVY CHECK COE/MAJOR REPAIR: FOUR DAMAGED HOLES IN LOWER SKIN STRAP AT FRAME 42 ADJACENT TO RT CREASE BEAM. REPAIRED PER SRAS ES-4093/18...13420, DATED 9/14/20
- [SDR COEA2018091111921](https://openairdocs.org/sdr/COEA2018091111921), Jul 24, 2018: LANDING. CORRODED. HEAVY CHECK COE/MAJOR REPAIR: LT WING PANEL 521DT LANDING HAS FRETTING DAMAGE. LEVEL 2, REPAIR PER SRAS DO/TS-3860/04...2939 ISSUE D, DATED 8/17/2018.
- [SDR COEA2018091110921](https://openairdocs.org/sdr/COEA2018091110921), Jul 24, 2018: LANDING. CORRODED. HEAVY CHECK COE/MAJOR REPAIR: LT WING PANEL 522CT LANDING HAS FRETTING DAMAGE. LEVEL 2, REPAIRED PER SRAS DO/TS-3860/04...2939 ISSUE D, DATED 8/17/2018.
- [SDR COEA2018090609921](https://openairdocs.org/sdr/COEA2018090609921), Jul 24, 2018: LANDING. CORRODED. HEAVY CHECK COE/MAJOR REPAIR: RT WING PANEL 622CT LANDING HAS FRETTING DAMAGE. LEVEL 2. REPAIRED PER SRAS DO/TS-3860/04...2939 ISSUE D, DATED 8/17/2018.
- [SDR COEA2018090608921](https://openairdocs.org/sdr/COEA2018090608921), Jul 23, 2018: BULKHEAD. CORRODED. HEAVY CHECK COE/MAJOR REPAIR: FORWARD PRESSURE BULKHEAD HAS LEVEL 2 CORROSION AT UPPER RT OUTBOARD BONDING POINT. REPAIRED PER SRAS CETS-4463/16...10711 ISSUE B
- [SDR COEA2018090607921](https://openairdocs.org/sdr/COEA2018090607921), Jul 23, 2018: BULKHEAD. CORRODED. HEAVY CHECK COE/MAJOR REPAIR: FORWARD PRESSURE BULKHEAD HAS LEVEL 2 CORROSION AT UPPER RT BONDING POINT. REPAIRED PER SRAS CETS-4463/16...10711 ISSUE B, DATED 8
- [SDR COEA2018090606921](https://openairdocs.org/sdr/COEA2018090606921), Jul 23, 2018: BULKHEAD. CORRODED. HEAVY CHECK COE/MAJOR REPAIR: FORWARD PRESSURE BULKHEAD HAS LEVEL 2 CORROSION AT UPPER LT OUTBOARD BONDING POINT. REPAIRED PER SRAS CETS-4463/16...10711 ISSUE B
- [SDR COEA2018090605921](https://openairdocs.org/sdr/COEA2018090605921), Jul 23, 2018: BULKHEAD. CORRODED. HEAVY CHECK COE/MAJOR REPAIR: FWD PRESSURE BULKHEAD HAS LEVEL 2 CORROSION AT UPPER LT BONDING POINT. REPAIRED PER SRAS CETS-4463/16...10711 ISSUE B, DATED 8/9/2
- [SDR COEA2018090504921](https://openairdocs.org/sdr/COEA2018090504921), Jul 23, 2018: BULKHEAD. CORRODED. HEAVY CHECK COE/MAJOR REPAIR: FORWARD PRESSURE BULKHEAD HAS LEVEL 2 CORROSION AT LOWER RT OUTBOARD BONDING POINT. REPAIRED PER SRAS CETS-4463/16...10711 ISSUE B
- [SDR COEA201808303921](https://openairdocs.org/sdr/COEA201808303921), Jul 23, 2018: BULKHEAD. CORRODED. WO 186959 NR 100022 HEAVY CHECK COE/MAJOR REPAIR: FWD PRESSURE BULKHEAD HAS LEVEL 2 CORROSION AT LOWER R/H OUTBOARD BONDING POINT. CORRECTIVE ACTION: REPAIRED P
- [SDR COEA201808302921](https://openairdocs.org/sdr/COEA201808302921), Jul 23, 2018: BULKHEAD. CORRODED. WO 186959 NR 100021 HEAVY CHECK COE/MAJOR REPAIR: FWD PRESSURE BULKHEAD HAS LEVEL 2 CORROSION AT LWR L/H BONDING POINT. CORRECTIVE ACTION: REPAIRED PER SRAS CET
- [SDR COEA201808301921](https://openairdocs.org/sdr/COEA201808301921), Jul 23, 2018: BULKHEAD. CORRODED. WO 186959 NR 100020 HEAVY CHECK COE/MAJOR REPAIR: FWD PRESSURE BULKHEAD HAS LEVEL 2 CORROSION AT LOWER L/H OUTBOARD BONDING POINT. CORRECTIVE ACTION: REPAIRED P
- [SDR COEA2017051601921](https://openairdocs.org/sdr/COEA2017051601921), May 16, 2017: WIRE. DAMAGED. DURING VISUAL APPROACH, THE CREW RECEIVED A MASTER WARNING LANDING GEAR NOT DOWN ON CAP AND 1 RT UNLOCK LIGHT ON OVERHEAD PANEL. INITIATED A GO AROUND, CYCLED T
- [SDR COEA2016122038921](https://openairdocs.org/sdr/COEA2016122038921), Dec 20, 2016: HMU. MALFUNCTIONED. DURING CLIMB OUT, THE NR 1 ENGINE PARAMETERS SURGED, NR 1 TORQUE INDICATOR NO LONGER FUNCTIONED AND MAIN BATTER CHARGE FAULT. FURTHER MAINTENANCE REPLACED THE N
- [SDR COEA2016101219921](https://openairdocs.org/sdr/COEA2016101219921), Oct 12, 2016: INTERCOSTAL. CORRODED. INTERCOSTAL, FRAMES 12-13 HAS CORROSION. REPLACED.
- [SDR COEA2016101218921](https://openairdocs.org/sdr/COEA2016101218921), Oct 12, 2016: INTERCOSTAL. CORRODED. INTERCOSTAL FROM FRAMES 12-13 HAS CORROSION. REPLACED.
- [SDR COEA2016100917921](https://openairdocs.org/sdr/COEA2016100917921), Oct 9, 2016: INTERCOSTAL. CORRODED. LEVEL 2 CORROSION ON INTERCOSTAL PN S53173209200. REPLACED INTERCOSTAL WITH OEM PART.
- [SDR COEA2016100716921](https://openairdocs.org/sdr/COEA2016100716921), Oct 7, 2016: LONGERON. CORRODED. HEAVY CHECK COE/MINOR REPAIR. LT INTERCOSTAL FROM FRAMES 12-13 LBL 19 FOUND INBD ATTACHING INTERCOSTAL HAS LEVEL 2 CORROSION. REPLACED INTERCOSTAL WITH OEM PART
- [SDR COEA2016100714921](https://openairdocs.org/sdr/COEA2016100714921), Oct 7, 2016: INTERCOSTAL. CORRODED. HEAVY CHECK COE/MINOR REPAIR. LT INTERCOSTAL AT LBL 16 FRAMES 12-13 HAS LEVEL 2 CORROSION. REPLACED INTERCOSTAL WITH OEM PART.
- [SDR COEA2016100613921](https://openairdocs.org/sdr/COEA2016100613921), Oct 6, 2016: FLOORBOARD. CORRODED. HEAVY CHECK COE/MINOR REPAIR. FLOORBOARD 214BF HAS LEVEL 2 CORROSION. REPLACED WITH OEM PART.
- [SDR COEA2016100612921](https://openairdocs.org/sdr/COEA2016100612921), Oct 6, 2016: STRUCTURE. CORRODED. HEAVY CHECK COE/MINOR REPAIR. LT INBOARD CHORD FRAME 8-13 HAS LEVEL 2 CORROSION. REPLACED CHORD WITH OEM PART.
- [SDR COEA2016100311921](https://openairdocs.org/sdr/COEA2016100311921), Oct 3, 2016: FLOORBEAM. CORRODED. HEAVY CHECK COE/MINOR REPAIR. LEVEL 2 CORROSION ON LT UPPER FLOORBEAM 9 BY CAPTAIN SEAT MOUNT STR. REPLACE FLOORBEAM WITH OEM PART.
- [SDR COEA2016100232921](https://openairdocs.org/sdr/COEA2016100232921), Oct 2, 2016: SUPPORT. CORRODED. HEAVY CHECK COE/MINOR REPAIR: LEVEL 2 CORROSION ON CROSS SUPPORT EXTRUSION AT LBL 16 BETWEEN FLOORBEAMS 12-13. REPLACED CROSS SUPPORT EXTRUSION WITH OEM PART.
- [SDR COEA2016100231921](https://openairdocs.org/sdr/COEA2016100231921), Oct 2, 2016: LONGERON. CORRODED. HEAVY CHECK COE/MINOR REPAIR: LEVEL 2 CORROSION ON LONGERON AT LBL 19 BETWEEN FLOORBEAM 12-13. REPLACED LONGERON WITH OEM PART.
- [SDR COEA2016100230921](https://openairdocs.org/sdr/COEA2016100230921), Oct 2, 2016: LONGERON. CORRODED. HEAVY CHECK COE/MINOR REPAIR: LEVEL 2 CORROSION ON LONGERON AT LBL 16 BETWEEN FLOORBEAMS 12-13. REPLACED LONGERON WITH OEM PART.
- [SDR COEA2016100226921](https://openairdocs.org/sdr/COEA2016100226921), Oct 2, 2016: FRAME. CORRODED. HEAVY CHECK COE/MINOR REPAIR: LEVEL 2 CORROSION ON FRAME 10 LT SIDE. REPLACE FRAME SEGMENT WITH OEM PART.

All 95: https://openairdocs.org/aircraft/N921FX/reports.md

## STCs that may be installed (OpenAirDocs) (109, 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 (Aerospatiale/Aeritalia ATR 42-300)

- [STC ST01305WI-D](https://openairdocs.org/stc/ST01305WI-D): Modification of a Collins ALT-50A or ALT-55B Radio Altimeter system installation to a Collins ALT-1000 or ALT-4000 Radio Altimeter system installation in accordance with Collins Drawing Index as listed on AML No. ST01305WI-D, Revision -, or later FAA approved revision. Rockwell Collins Inc
- [STC ST01761NY](https://openairdocs.org/stc/ST01761NY): Conversion of an ATR-420/300/320 passenger configuration into a full Class E cargo configuration, including a new lining, smoke detection system, large cargo door with an embedded crew door, and provisions for the transportation of bulk weight and standard unit load devices. PMV Engineering
- [STC ST12461IB](https://openairdocs.org/stc/ST12461IB): Installation of Cockpit Voice Recorder with optional RIPS Upgrade. Mid- Canada Mod Center
- [STC ST00197IB](https://openairdocs.org/stc/ST00197IB): Installation of the Universal Quick Access Recorder (uQAR). Flight Data Technologies Inc
- [STC ST12365IB](https://openairdocs.org/stc/ST12365IB): Installation of ERT/CNG/1579 Fuselage Protection for Unpaved Runway for Belly Fuselage Skin Panels. EIRTECH AVIATION SERVICES LIMITED
- [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 ST03875NY](https://openairdocs.org/stc/ST03875NY): Installation of interior placards, signs and markings. Libellule Monde Inc
- [STC SA2622NM](https://openairdocs.org/stc/SA2622NM): Installation of Precise Flight Pulselite Control Unit in landing/taxi system. (767-200 B17) (DHC-8 101). Precise Flight Inc
- [STC ST00892LA](https://openairdocs.org/stc/ST00892LA): Installation of Emergency Vision Assurance System (EVAS). VisionSafe LLC
- [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 ST03166AT](https://openairdocs.org/stc/ST03166AT): Installation of L3 Communications Micro Quick Access Recorder (uQAR) models QAR100, 200 or 201. Acron Aviation Inc
- [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 ST04486NY](https://openairdocs.org/stc/ST04486NY): Installation of the Dual SFIM F227 APIRS. Mid Canada Mod Center
- [STC ST01189WI](https://openairdocs.org/stc/ST01189WI): Passenger to all cargo conversion. IPR M7 CONVERSIONS (USA) LIMITED c/o Vistra International
- [STC ST00079IB](https://openairdocs.org/stc/ST00079IB): Integration of Halon-free Portable Fire Extinguisher HAFEX. UMLAUT ENGINEERING GMBH
- [STC ST03042CH](https://openairdocs.org/stc/ST03042CH): Installation of a Global AirWorks Cockpit Door Surveillance System. Aero Technik Inc
- [STC ST02020WI](https://openairdocs.org/stc/ST02020WI): Reduce maximum zero fuel weight to restrict maximum payload to 7500 lbs. Worldwide Aircraft Services Inc
- [STC ST00215IB](https://openairdocs.org/stc/ST00215IB): Installation of saf-Tglo ECO Photoluminescent Aisle Path Marking Systems. STG AEROSPACE GERMANY GmbH
- [STC ST00192IB](https://openairdocs.org/stc/ST00192IB): Installation of Automatic Dependent Surveillance – Broadcast (ADS-B) Out System and Single UNS-1Lw Flight Management System including Localizer Performance with Vertical Guidance (LPV) Monitor. 365 AEROSPACE DDS LIMITED
- [STC ST02529AT](https://openairdocs.org/stc/ST02529AT): Installation of photoluminescent floor proximity emergency escape path marking system (FPEEPMS). STG Aerospace Inc
- [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 ST03238NY](https://openairdocs.org/stc/ST03238NY): The installation of a single HF-9000 Communication Transceiver System. Roeder Praezision GMBH
- [STC ST00098IB](https://openairdocs.org/stc/ST00098IB): Introduction of ADS-B Out. STC Twenty One Limited
- [STC ST00095IB](https://openairdocs.org/stc/ST00095IB): Conversion of Passenger to Freighter Configuration. Aerodisa S.L
- [STC ST01925CH](https://openairdocs.org/stc/ST01925CH): Installation of a Honeywell RESCU 406AF Emergency Locator Transmitter (ELT) System. Honeywell International Inc
- [STC ST03912AT](https://openairdocs.org/stc/ST03912AT): Installation of a T2CAS System into an ATR42/72 Series Aircraft and associated hardware. Woven Electronics LLC
- [STC SA8860SW](https://openairdocs.org/stc/SA8860SW): Replace core assembly of AiResearch Primary/Secondary Air-to-Air Heat Exchangers, part numbers 194776-1, SR1; 194776-2, SR1; and 194776-2, SR2. Honeywell International Inc
- [STC ST04177AT](https://openairdocs.org/stc/ST04177AT): Installation of a Talon Aerospace LED Replacement General Purpose Lamps. Aaxico Technical Services Inc
- [STC ST04608NY](https://openairdocs.org/stc/ST04608NY): Installation of the Rockwell Collins TDR-94D Transponder Upgrade. Mid Canada Mod Center
- [STC ST04602NY](https://openairdocs.org/stc/ST04602NY): Installation of Decompression Panel for Bulk Freighter Conversion. Aeroconseil
- [STC SA01452CH](https://openairdocs.org/stc/SA01452CH): Installation of an air ambulance conversion kit. Med-Pac Inc
- [STC ST04372NY](https://openairdocs.org/stc/ST04372NY): Installation of saf-Tglo® SSUL23 Photoluminescent Aisle Path Marking System. STG Aerospace Ltd
- [STC ST04340NY](https://openairdocs.org/stc/ST04340NY): Installation of TCAS 7.1 (ACAS II) upgrade of Prior Existing TCAS 7.0. Scandinavian Avionics Design ApS
- [STC ST04443AT](https://openairdocs.org/stc/ST04443AT): Replacement of the HT1000 MCDU (Multi-Function Control Display Unit) with the HT9100 MCDU. Chippewa Aerospace Inc
- [STC ST02647NY](https://openairdocs.org/stc/ST02647NY): Update of Delta Engineering Synchro's and Sagem ED36 FDAU with APM (Aircraft Performance Monitor). Delta Engineering Corporation
- [STC ST02636LA](https://openairdocs.org/stc/ST02636LA): Modification to upgrade the existing XS-950 Mode S Transponder system to add ADS-B Out. Aviation Communication and Surveillance Systems (ACSS) LLC
- [STC ST04437AT](https://openairdocs.org/stc/ST04437AT): Replacement/Upgrade of HT1000 NPR (Nav Processor Unit) and the HT9100 NPR. Chippewa Aerospace Inc
- [STC ST04288NY](https://openairdocs.org/stc/ST04288NY): For ATR 42 Model Aircraft and ATR 72 Model Aircraft Installation of gravel protection. Northeast Engr & Dev Ltd
- [STC ST04229NY](https://openairdocs.org/stc/ST04229NY): Introduction of a 16G New Generation Stretcher XL P/N 1120030-Series. Bucher Leichtbau AG
- [STC ST01872NY](https://openairdocs.org/stc/ST01872NY): Installation of Hawker 9750W0538 (24V 40Ah) and 9750W0350-5 (24V 18Ah) sealed lead-acid battery. Securaplane Technologies
- [STC ST02655LA](https://openairdocs.org/stc/ST02655LA): Installation of two True Blue Power model TA102 Charging Ports in the cockpit. U.S. Technical
- [STC ST02528SE](https://openairdocs.org/stc/ST02528SE): Installation of lightweight window plugs. LiteAir Aviation Products Inc
- [STC ST02509SE](https://openairdocs.org/stc/ST02509SE): Installation of dual Garmin GTX3000 transponders with ADS-B Out. AeroMech Incorporated
- [STC ST03776NY](https://openairdocs.org/stc/ST03776NY): Modification to upgrade existing Rockwell Collins TCAS (Model: TTR-920, TTR-921, and TTR-4000) at VERSION 7.0 to Rockwell Collins TCAS (Model: TTR-921, TTR-4000, and TTR-4100) at VERSION 7.1 (ACAS II). Scandinavian Avionics Design ApS
- [STC ST03840NY](https://openairdocs.org/stc/ST03840NY): Installation of the SkyTrac Flight Following/SATCOM System. SkyTrac Systems Ltd
- [STC ST03716NY](https://openairdocs.org/stc/ST03716NY): Installation of the AFIRS 228 system. FLYHT Aerospace Solutions Ltd
- [STC ST00881WI-D](https://openairdocs.org/stc/ST00881WI-D): Modification of a TCAS II system installation to Change 7.0 or Change 7.1. Rockwell Collins Inc
- [STC ST03707NY](https://openairdocs.org/stc/ST03707NY): Replacement of fluorescent lighting with LED lighting. First Air
- [STC ST01812WI](https://openairdocs.org/stc/ST01812WI): Installation of dual Garmin GTN 725 GPS Navigator System with dual Garmin GA36 WAAS/GPS antennas. Garmin International Inc

All 109: https://openairdocs.org/aircraft/N921FX/stcs.md

## Related

- Other Aerospatiale/Aeritalia ATR 42-300 aircraft: https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-300/aircraft.md
- The Pratt & Whitney Canada PW120 engine: https://openairdocs.org/engine/pratt-whitney-canada-pw120.md

---
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