# N400EF: 2026 Bye Aerospace EFLYER 2 MODEL 10

- Status: Valid registration
- Airframe: [Bye Aerospace EFLYER 2 MODEL 10](https://openairdocs.org/model/bye-aerospace-eflyer-2-model-10) (registry code 05643UH, 2 seats)
- Engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999)
- Serial number: 0001
- Year built: 2026
- Type: Fixed wing single engine
- Engine type: Electric
- Airworthiness: Experimental, research and development
- Airworthiness date: September 8, 2026
- Certificate issued: June 26, 2026
- Expires: June 30, 2033
- Mode S code: A4AD0B
- Registered owner: [Bye Aerospace Inc](https://openairdocs.org/faa-owner/BYE%20AEROSPACE%20INC)
- Location: [Englewood, CO](https://openairdocs.org/faa-place/CO/Englewood)
- Owner type: Corporation
- Owner's area on the map: 39.5732° N, 104.8649° W: Placed by OpenAirDocs at the center of ZIP code 80112, 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=400EF
- Page: https://openairdocs.org/aircraft/N400EF

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 (Bye Aerospace EFLYER 2 MODEL 10)

None in force.

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

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N400EF.

## FAA accident and incident reports

None matched to N400EF.

## 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)

None matched to this aircraft's models.

## Earlier aircraft with N400EF

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N400EF before.

- [Cancelled 2005-07-13](https://openairdocs.org/deregistered/N400EF-2005-07-13): Gates Learjet 35A, S/N 561, built 1985. Sale reported. Owner: [Wright/Pat Afb, OH](https://openairdocs.org/faa-place/OH/Wright%2FPat%20Afb)

## Related

- Other Bye Aerospace EFLYER 2 MODEL 10 aircraft: https://openairdocs.org/model/bye-aerospace-eflyer-2-model-10/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.