Thomas N Helm SONEX ONEX
N551X is a Thomas N Helm SONEX ONEX, a fixed-wing airplane with one motor with a piston engine, built in 2021. It has 1 seat. It is registered to an individual in Neenah, Wisconsin. The registration is valid: it was issued on May 12, 2020 and expires on May 31, 2027. It holds an experimental airworthiness certificate for amateur built, dated June 17, 2021.
Aircraft
- Maker
- Thomas N Helm
- Model
- SONEX ONEX
- Serial number
- ONX0137
- Type
- Fixed-wing, single engine
- Power
- Piston (reciprocating), 1 motor · Aeroconver AEROVEE · 80 hp
- Seats
- 1
- Year built
- 2021
- Kit
- SONEX AIRCRAFT LLC ONEX
- Transponder code
- A7052F (octal 51602457)
Registration
- Status
- Valid registration
- Certificate issued
- May 12, 2020
- Expires
- May 31, 2027
- Last FAA action
- January 22, 2023
- Airworthiness
- Experimental · Amateur built · June 17, 2021
- FAA region
- Great Lakes
- FAA record id
- 01316816
Owner as the FAA publishes it
- Name
- Helm Thomas N
- Type
- Individual
- Address
- 1335 Lori Dr
Neenah, WI 54956-1998
Owners can ask the FAA to withhold their name and address from public files. When they do, those fields are blank here as well. How that works.
Documents on file 0
No bills of sale, loans or other documents are indexed against this tail number.
Earlier use of this number 2
Records check free · 2 to understand · 3 clear
The public federal record on N551X, read the way a buyer, lender or insurer reads it: FAA registration, prior tail numbers keyed on the serial number, reuse of the tail number, recent registry filings, and the NTSB accident record under this and every earlier registration.
Valid registration to Helm Thomas N, an individual, certificate issued May 12, 2020, expires May 31, 2027. No fractional interest recorded. [1]
Experimental certificate for amateur built, dated June 17, 2021, consistent with the 2021 manufacture year. [1]
No earlier tail number is recorded against serial ONX0137 for this model in the deregistered file. [2]
N551X was previously assigned to 2 other aircraft: Eldredge Kevin S51 (serial 076, cancelled April 12, 2012); Boeing A75N1 (serial 75267, cancelled July 10, 1995). Histories keyed to the tail number alone can mix aircraft up; this check keys on the serial number. [2]
No bills of sale, loans or releases have reached the registry in recent weeks. The index covers only recent filings; older liens are in the records file. [3]
1 NTSB record under N551X: Accident on March 6, 2009 at Ocala, FL: fatal, substantial damage (1 fatal). Details below. [4]
These live in the FAA aircraft records file (every document ever filed against the aircraft) and, for larger aircraft, the International Registry. Part of the full report.
AD compliance against the logbooks and flight-activity reconciliation are researched layers of the full report.
NTSB records 1
Aircraft on the NTSB record: Kevin Eldredge Stewart · operated under 091
A loss of engine power due to contamination and clogging of the fuel system by a post-assembly fuel tank sealant.
Search the NTSB's CAROL system for ERA09LA184 for the docket and final report. Open CAROL
- FAA Releasable Aircraft Database, master file, file of October 2, 2026. registry.faa.gov/
- FAA deregistered aircraft file (part of the same download), file of October 2, 2026. registry.faa.gov/
- FAA document index: registry documents received in recent weeks, file of October 2, 2026. registry.faa.gov/
- NTSB aviation accident database (CAROL), records through August 27, 2026. data.ntsb.gov/carol-main-public/basic-search
This automated check reads the public federal record. Nothing here is a legal opinion, an appraisal or a statement about the aircraft's condition; a CLEAR line is a statement about the searched record, not the aircraft.
Source: FAA Civil Aviation Registry, Releasable Aircraft Database, October 2, 2026. See this record on the FAA site · This record as data