# N400AG: 2026 Albrecht Gass WHISPER ACFT X350G2

- Status: Valid registration
- Airframe: [Albrecht Gass WHISPER ACFT X350G2](https://openairdocs.org/model/albrecht-gass-whisper-acft-x350g2) (registry code 0564290, 2 seats)
- Engine: [Ulpower 520IS](https://openairdocs.org/engine/ulpower-520is) (registry code 63045)
- Serial number: WA24042
- Year built: 2026
- Type: Fixed wing single engine
- Engine type: 4 cycle
- Kit: Whisper Aircraft X350 GEN II
- Airworthiness: Experimental, amateur built
- Airworthiness date: September 1, 2026
- Certificate issued: August 21, 2025
- Expires: August 31, 2032
- Mode S code: A4ACA8
- Owner type: Individual
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=400AG
- Page: https://openairdocs.org/aircraft/N400AG

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 (Albrecht Gass WHISPER ACFT X350G2)

None in force.

### Matched by engine (Ulpower 520IS)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N400AG.

## FAA accident and incident reports

None matched to N400AG.

## 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 N400AG

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N400AG before.

- [Cancelled 2018-03-13](https://openairdocs.org/deregistered/N400AG-2018-03-13): Graves Alan J KOLB TWINSTAR, S/N TS-0094. Registration expired, pending cancellation. Owner: [Graves Alan J](https://openairdocs.org/faa-owner/GRAVES%20ALAN%20J), [Old Orchard Beach, ME](https://openairdocs.org/faa-place/ME/Old%20Orchard%20Beach)

## Related

- Other Albrecht Gass WHISPER ACFT X350G2 aircraft: https://openairdocs.org/model/albrecht-gass-whisper-acft-x350g2/aircraft.md
- The Ulpower 520IS engine: https://openairdocs.org/engine/ulpower-520is.md

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