# N725K: 2025 Titus J Koehn SLING TSI

- Status: Valid registration
- Airframe: [Titus J Koehn SLING TSI](https://openairdocs.org/model/titus-j-koehn-sling-tsi) (registry code 056422T, 4 seats)
- Engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999)
- Serial number: 409SK
- Year built: 2025
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Kit: Airplane Factory Inc SLING TSI
- Airworthiness: Experimental, amateur built
- Airworthiness date: June 18, 2025
- Certificate issued: April 14, 2025
- Expires: April 30, 2032
- Mode S code: A9B700
- Owner type: Individual
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=725K
- Page: https://openairdocs.org/aircraft/N725K

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): 0 in force

### Matched by airframe (Titus J Koehn SLING TSI)

None in force.

### Matched by engine (Amateur-built UNKNOWN ENG)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N725K.

## FAA accident and incident reports

None matched to N725K.

## 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 N725K not matched to an aircraft (2)

They name N725K, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft.

- [SDR 96ZZZX964](https://openairdocs.org/sdr/96ZZZX964), Feb 5, 1996: REVERSER. MALFUNCTION. UPON LANDING, THRUST REVERSER FAILED TO STOW ALL THE WAY, PILOT TRIED TO CYCLE T/R SEVERAL TIMES WITH NO SUCCESS, CAUSING MORE DAMAGE. APPEARS BLOCKER DOORS DID
- [SDR 95ZZZX2449](https://openairdocs.org/sdr/95ZZZX2449), Mar 29, 1995: VALVE. FAILED. TEMPERATURE CONTROL VALVE DIAPHRAGM RUPTURED CAUSING DAMAGE TO DIAPHRAGM BODY AND SEVERING ACTUATING LINKAGE. AIRCRAFT WAS PREPARING FOR DEPARTURE WITH NO CONTR

## STCs that may be installed (OpenAirDocs)

None matched to this aircraft's models.

## Earlier aircraft with N725K

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N725K before.

- [Cancelled 1935-10-21](https://openairdocs.org/deregistered/N725K-1935-10-21): Curtiss Aeroplane & Motor B-20 CONDOR, S/N G-2. Owner: [Chamberlin Flying Service Inc](https://openairdocs.org/faa-owner/CHAMBERLIN%20FLYING%20SERVICE%20INC), [Long Island, NY](https://openairdocs.org/faa-place/NY/Long%20Island)

## Related

- Other Titus J Koehn SLING TSI aircraft: https://openairdocs.org/model/titus-j-koehn-sling-tsi/aircraft.md
- The Amateur-built UNKNOWN ENG engine: https://openairdocs.org/engine/amateur-built-unknown-eng.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.