# N6478: 1928 Curtiss Wright TRAVEL AIR D-4000 - Status: Valid registration - Airframe: [Curtiss Wright TRAVEL AIR D-4000](https://openairdocs.org/model/curtiss-wright-travel-air-d-4000) (registry code 2621808, 3 seats) - Engine: [Lycoming R680](https://openairdocs.org/engine/lycoming-r680) (registry code 41540) - Data sheets: [TCDS TC 2-84](https://openairdocs.org/tcds/TC%202-84) (Curtiss-Wright Corporation), [TCDS ATC 42 Textron Lycoming](https://openairdocs.org/tcds/ATC%2042%20Textron%20Lycoming) (Textron Lycoming AVCO Corporation) (OpenAirDocs) - Serial number: 798 - Year built: 1928 - Type: Fixed wing single engine - Engine type: Reciprocating - Airworthiness: Standard, normal - Airworthiness date: May 21, 1976 - Certificate issued: July 24, 2020 - Expires: July 31, 2027 - Mode S code: A882AC - Registered owner: [Younkin Matthew Trustee](https://openairdocs.org/faa-owner/YOUNKIN%20MATTHEW%20TRUSTEE) - Location: [Siloam Springs, AR](https://openairdocs.org/faa-place/AR/Siloam%20Springs) - Owner type: Individual - Owner's area on the map: 36.1653° N, 94.4561° W: Placed by OpenAirDocs at the center of ZIP code 72761, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=6478 - Page: https://openairdocs.org/aircraft/N6478 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): 5 in force ### Matched by airframe (Curtiss Wright TRAVEL AIR D-4000) None in force. ### Matched by engine (Lycoming R680) - [AD 2012-03-07](https://openairdocs.org/ad/2012-03-07): Carburetor · Lycoming Engines GO-435, GO-435-C2 (O-435-17), GO-435-C2A and 389 more. Effective Mar 27, 2012 - [AD 2004-10-14](https://openairdocs.org/ad/2004-10-14): Crankshaft gear · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 642 more. Effective Jun 25, 2004 - [AD 95-26-02](https://openairdocs.org/ad/95-26-02): Aviation Gasoline · Lycoming Engines IO-320-B1A, IO-320-B1B, IO-320-B1C and 182 more. Effective Jan 24, 1996 - [AD 90-04-06 R1](https://openairdocs.org/ad/90-04-06-R1): Propeller Governor External Oil Line · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 427 more. Effective May 28, 1991 - [AD 66-06-03](https://openairdocs.org/ad/66-06-03): Connecting Rod Assemblies · Lycoming Engines GO-435-C2 (O-435-17), GO-435-C2A, GO-435-C2A2 and 317 more. Effective Jan 16, 1969 ## Information bulletins (advisory) None matched. ## NTSB investigations None matched to N6478. ## FAA accident and incident reports None matched to N6478. ## 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. ## Service difficulty reports on N6478 not matched to an aircraft (1) They name N6478, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft. - [SDR HYTA20150908001](https://openairdocs.org/sdr/HYTA20150908001), Aug 29, 2015: STRUCTURE. CRACKED. CRACKS FOUND IN UPPER TUBE OF CARRY THRU ASSEMBLY, PN 391-030-401-30, AT LOW POINT OF THE TWO CUT OUTS WHICH ARE MILLED IN THE TUBE TO ALLOW INSTALLATION OF WIN ## STCs that may be installed (OpenAirDocs) (7) 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 (Curtiss Wright TRAVEL AIR D-4000) - [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC - [STC SA01757WI](https://openairdocs.org/stc/SA01757WI): To allow the use of UL91 or UL94 (minimum) grade aviation fuel. Swift Fuels LLC - [STC SA4503NM](https://openairdocs.org/stc/SA4503NM): Remove original cloth covering and install Ceconite covering. Ceconite Division of Poly-Fiber Inc - [STC SA01831WI](https://openairdocs.org/stc/SA01831WI): To allow the use of UL91 (minimum) grade aviation fuel. Petersen Aviation Inc - [STC SA01406NY](https://openairdocs.org/stc/SA01406NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K017 on single and multi-engine fixed light aircraft and rotary wing. Airwolf Filter Corporation - [STC SA00478CH](https://openairdocs.org/stc/SA00478CH): Installation of Cooper Superflite 102 Fabric. Aviation Products Systems Inc ### Approved for the engine (Lycoming R680) - [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC ## Related - Other Curtiss Wright TRAVEL AIR D-4000 aircraft: https://openairdocs.org/model/curtiss-wright-travel-air-d-4000/aircraft.md - The Lycoming R680 engine: https://openairdocs.org/engine/lycoming-r680.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.