# N401US: 1957 Douglas DC-7 - Status: Valid registration - Airframe: [Douglas DC-7](https://openairdocs.org/model/douglas-dc-7) (registry code 3021802, 102 seats) - Engine: [Wright TC18DA series](https://openairdocs.org/engine/wright-tc18da-series) (registry code 67037) - Data sheets: [TCDS 4A10](https://openairdocs.org/tcds/4A10) (The Boeing Company) (OpenAirDocs) - Serial number: 45145 - Year built: 1957 - Type: Fixed wing multi engine - Engine type: Reciprocating - Airworthiness: Standard - Certificate issued: December 27, 2012 - Expires: December 31, 2028 - Mode S code: A4B22B - Registered owner: [Corsair Two LLC](https://openairdocs.org/faa-owner/CORSAIR%20TWO%20LLC) - Location: [Hillsboro, OR](https://openairdocs.org/faa-place/OR/Hillsboro) - Owner type: LLC - Owner's area on the map: 45.5692° N, 122.9472° W: Placed by OpenAirDocs at the center of ZIP code 97124, within about 4 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=401US - Page: https://openairdocs.org/aircraft/N401US 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. The registry lists only the engine series, so ADs for every Wright TC18DA model are included. ## ADs that may apply (OpenAirDocs): 24 in force ### Matched by airframe (Douglas DC-7) - [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 2011-12-01](https://openairdocs.org/ad/2011-12-01): Equipment/Furnishings · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 268 more. Effective Aug 1, 2011 - [AD 2004-22-01](https://openairdocs.org/ad/2004-22-01): Cargo restraint strap assemblies · Cargo restraint straps (Airline Container Manufacturing STC ST01004NY). Effective Dec 1, 2004 - [AD 93-14-12](https://openairdocs.org/ad/93-14-12): Crewmember Protective Breathing Equipment Units · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 201 more. Effective Sep 2, 1993 - [AD 89-11-07](https://openairdocs.org/ad/89-11-07): Main Landing Gear Fittings · Boeing DC-6, DC-6A, DC-6B and 6 more. Effective Jun 23, 1989 - [AD 67-13-02](https://openairdocs.org/ad/67-13-02): Operating Limitations · Boeing DC-6, DC-6A, DC-6B and 6 more. Effective Dec 1, 1978 - [AD 74-24-09](https://openairdocs.org/ad/74-24-09): Auxiliary Power Units · Airbus BAC 1-11 200 Series, BAC 1-11 400 Series, Auxiliary Power Units and 63 more. Effective Nov 19, 1975 - [AD 74-17-01](https://openairdocs.org/ad/74-17-01): Regulator · Boeing 707-100 Long Body, 707-100B Long Body, 707-100B Short Body and 78 more. Effective Sep 16, 1974 - [AD 64-03-03](https://openairdocs.org/ad/64-03-03): Blades · Boeing DC-6, DC-6A, DC-6B and 26 more. Effective Mar 1, 1964 - [AD 62-25-02](https://openairdocs.org/ad/62-25-02): Main Landing Gear Shock Strut Cylinder · Boeing DC-6, DC-6A, DC-6B and 3 more - [AD 61-08-01](https://openairdocs.org/ad/61-08-01): Fuel Transfer · Boeing DC-6, DC-6A, DC-6B and 3 more. Effective May 9, 1961 - [AD 61-06-03](https://openairdocs.org/ad/61-06-03): Spar Caps · Boeing DC-7 and DC-7B - [AD 59-06-02](https://openairdocs.org/ad/59-06-02): Landing Gear Orifice Check Valve · Boeing DC-7, DC-7B and DC-7C - [AD 59-02-02](https://openairdocs.org/ad/59-02-02): Engine Cowling Alining · Boeing DC-7, DC-7B and DC-7C - [AD 58-15-01](https://openairdocs.org/ad/58-15-01): Safety Belt Hook Assembly · Boeing DC-6, DC-6A, DC-6B and 3 more - [AD 58-11-01](https://openairdocs.org/ad/58-11-01): Nose Wheel Retract Link · Boeing DC-6, DC-6A, DC-6B and 3 more - [AD 57-16-03](https://openairdocs.org/ad/57-16-03): Elevator Tab Pushrod · Boeing DC-7, DC-7B and DC-7C - [AD 57-16-02](https://openairdocs.org/ad/57-16-02): Rudder Tab Push-Pull Tube · Boeing DC-7, DC-7B and DC-7C - [AD 57-03-03](https://openairdocs.org/ad/57-03-03): Micronic Filter Cover · Boeing DC-7, DC-7B, DC-7C and 16 more - [AD 57-03-02](https://openairdocs.org/ad/57-03-02): Fuel Strainer Screen · Boeing DC-7, DC-7B, DC-7C and 15 more - [AD 55-20-02](https://openairdocs.org/ad/55-20-02): Wing Skin Heat Shields · Boeing DC-7, DC-7B and DC-7C - [AD 55-15-05](https://openairdocs.org/ad/55-15-05): Propeller Feathering Lines · Boeing DC-7, DC-7B and DC-7C - [AD 55-11-01](https://openairdocs.org/ad/55-11-01): Nose Gear Yoke End Fitting · Boeing DC-6, DC-6A, DC-6B and 3 more ### Matched by engine (Wright TC18DA series) None in force. ### Historical (superseded or no longer in force) - [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 ## Information bulletins (advisory) (1 in force) - [SAIB NM-15-03](https://openairdocs.org/saib/NM-15-03): Flight Controls. Issued Nov 24, 2014 ## NTSB investigations None matched to N401US. ## FAA accident and incident reports None matched to N401US. ## Service difficulty reports None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. ## STCs that may be installed (OpenAirDocs) (48) 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 (Douglas DC-7) - [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 SA863EA](https://openairdocs.org/stc/SA863EA): Incorporation of DME Corporation emergency evacuation slide lighting system. Astronics Luminescent Systems Inc - [STC SA2709WE](https://openairdocs.org/stc/SA2709WE): Installation of 3000 gallon external retardant tanks under the fuselage at the wing center section. United Aeronautical Corporation - [STC SA3015WE](https://openairdocs.org/stc/SA3015WE): Installation of LH and RH upper viewing windows above side cockpit windows. United Aeronautical Corporation - [STC ST334CH](https://openairdocs.org/stc/ST334CH): Installation of Superflite 102 fabric. Aviation Products Systems Inc - [STC SA796WE](https://openairdocs.org/stc/SA796WE): Wing flap attachments modification. S/Ns 44903, 44904. 45143 thru 45149, 45151 thru 45154, 45356, 45358, 45360, 45482 thru 45490. Boeing Company - [STC SA364SO](https://openairdocs.org/stc/SA364SO): Cockpit voice recorder. Delta Airlines Inc - [STC SA1369GL](https://openairdocs.org/stc/SA1369GL): Surrendered and incorporated into STC ST334CH. Cooper Aviation Supply Company, Inc - [STC ST01004NY](https://openairdocs.org/stc/ST01004NY): Installation of cargo restraint straps. Airline Container Manufacturing Co Inc - [STC SA02168AK](https://openairdocs.org/stc/SA02168AK): Installation of hourmeter airspeed switch. For unpressurized aircraft only. Pressurized aircraft must have pressurization system deactivated. Avalaska Inc - [STC SA3093NM](https://openairdocs.org/stc/SA3093NM): Installation of military model R-3350-42 (STC SE2004NM) or R-3350-93 (STC SE2007NM) engines. Tulare Aircraft Service - [STC ST484SO](https://openairdocs.org/stc/ST484SO): Installation of cargo restraining bulkhead. Aeronautical Engineers, Inc - [STC SA7SO](https://openairdocs.org/stc/SA7SO): Radome and radar antennae mount provisions for up to 22-inch diameter antennae, RAC AVQ-10 or Bendix RDR-1 (X/C Band). Tempo Design Corp - [STC SA103WE](https://openairdocs.org/stc/SA103WE): Interior arrangement for 104 passengers. Camaero Inc - [STC SA1068WE](https://openairdocs.org/stc/SA1068WE): Interior arrangement. California Airmotive Corporation - [STC SA1075WE](https://openairdocs.org/stc/SA1075WE): AVQ9 radar altimeter, APN9 Loran receiver, AT144 HF transmitter and AR144 HF receiver. California Airmotive Corporation - [STC SA10SO](https://openairdocs.org/stc/SA10SO): Provisioned for installation of10,000 pound military pallet. Pan American World Airways Inc - [STC SA1361WE](https://openairdocs.org/stc/SA1361WE): Fairchild Industrial Products Model A100, cockpit voice recorder system. Saturn Airways Inc - [STC SA176NW](https://openairdocs.org/stc/SA176NW): Installation of Fairchild Andover Model 204 auxiliary power unit for ground use only. Butler Aircraft Co - [STC SA214WE](https://openairdocs.org/stc/SA214WE): Passenger interior arrangements and cargo interior. Pacific Airmotive Corp - [STC SA23SO](https://openairdocs.org/stc/SA23SO): Observer's seat fuselage Station 55. Riddle Airlines Inc - [STC SA294WE](https://openairdocs.org/stc/SA294WE): Door in floor for cabin access. AiResearch Aivation Service Co - [STC SA3-311](https://openairdocs.org/stc/SA3-311): Wheels 150741-1 and/or 150741-5 and brake assembly 150835-5. Bendix Aviation Corporation - [STC SA30SO](https://openairdocs.org/stc/SA30SO): Two emergency exits at stations437.9 - 460.5 from Type IV to Type III modified. Riddle Airlines Inc - [STC SA314WE](https://openairdocs.org/stc/SA314WE): Passenger interior arrangements and cargo interior for operation of aircraft at 106,400 pounds zero fuel weight. Pacific Airmotive Corp - [STC SA35SO](https://openairdocs.org/stc/SA35SO): Access hole in horizontal stabilizer. Riddle Airlines Inc - [STC SA4-124](https://openairdocs.org/stc/SA4-124): Station 122 bulkhead. Pan American World Airways Inc - [STC SA4-255](https://openairdocs.org/stc/SA4-255): Aft cabin lounge. AiResearch Aivation Service Co - [STC SA4-328](https://openairdocs.org/stc/SA4-328): Step kit added to fore and aft cargo door. National Aircraft Corp - [STC SA4-329](https://openairdocs.org/stc/SA4-329): Step kit added to fore and aft cargo door. National Aircraft Corp - [STC SA4-330](https://openairdocs.org/stc/SA4-330): Step kit added to fore and aft cargo door. National Aircraft Corp - [STC SA4-355](https://openairdocs.org/stc/SA4-355): Interior modification coach to mixed class. AiResearch Aivation Service Co - [STC SA4-405](https://openairdocs.org/stc/SA4-405): Interior modification to mixed class. AiResearch Aivation Service Co - [STC SA4-442](https://openairdocs.org/stc/SA4-442): Modification of communication equipment to provide navigator station. American Airlines Inc - [STC SA4-507](https://openairdocs.org/stc/SA4-507): Deterjet DJ1025 valve in place of Wright torquemeter booster pump upper housing per STC SEW-10. Pan American World Airways Inc - [STC SA4-54](https://openairdocs.org/stc/SA4-54): Passenger/cargo interior arrangement configurations. Pan American World Airways Inc - [STC SA4-91](https://openairdocs.org/stc/SA4-91): One 4-piece divan left-hand side inboard facing and one 2-place divan right-hand side aft facing from Station 891 aft to pressure dome. AiResearch Aivation Service Co - [STC SA425WE](https://openairdocs.org/stc/SA425WE): Single Federal (ITT) Type AFN3544 distance measuring equipment system. American Airlines Inc - [STC SA500EA](https://openairdocs.org/stc/SA500EA): Installation of microvision operational all-weather landing system. Bendix Corporation - [STC SA588WE](https://openairdocs.org/stc/SA588WE): Ceconite 101 covering of rudder. Cooper Engineering Corporation - [STC SA600SO](https://openairdocs.org/stc/SA600SO): Cockpit voice recording system. Airlift Intl Inc - [STC SA602WE](https://openairdocs.org/stc/SA602WE): 99-passenger interior arrangement modification including floor structure. Aircraft Investors - [STC SA656WE](https://openairdocs.org/stc/SA656WE): Interior modification for 98 occupants. California Airmotive Corporation - [STC SA724WE](https://openairdocs.org/stc/SA724WE): Interior arrangement modification for 89 and 99 passengers and installation of modified navigator's seat. Intl Aerodyne Inc - [STC SA76EA](https://openairdocs.org/stc/SA76EA): Radome assembly 3016. Chamberlain Aviation Inc - [STC SA89SO](https://openairdocs.org/stc/SA89SO): Oil separator B-300-1. Air Carrier Eng Service Inc - [STC SA4-608](https://openairdocs.org/stc/SA4-608): Engine mount core assemblies DE-643-1 on Wright TC18 Series engines. Dow-Elco Inc - [STC SA1-25](https://openairdocs.org/stc/SA1-25): Substitution of rotating discs9531691 and 9531704 in 9560285 and 9560286 brake assemblies. Goodyear Aerospace Corp ## Related - Other Douglas DC-7 aircraft: https://openairdocs.org/model/douglas-dc-7/aircraft.md - The Wright TC18DA series engine: https://openairdocs.org/engine/wright-tc18da-series.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.