# N4085: 1968 Flug & Fahrzeugwerke FFA HBV-DIAMANT 16.5

- Status: Valid registration
- Airframe: [Flug & Fahrzeugwerke FFA HBV-DIAMANT 16.5](https://openairdocs.org/model/flug-fahrzeugwerke-ffa-hbv-diamant-16-5) (registry code 3550808, 1 seats)
- Engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000)
- Serial number: 041
- Year built: 1968
- Type: Glider
- Engine type: None
- Airworthiness: Experimental, racing
- Airworthiness date: April 3, 1980
- Certificate issued: August 31, 2007
- Expires: February 29, 2028
- Mode S code: A4CD60
- Registered owner: [Tomczyk Greg](https://openairdocs.org/faa-owner/TOMCZYK%20GREG)
- Location: [Palatine, IL](https://openairdocs.org/faa-place/IL/Palatine)
- Owner type: Individual
- Owner's area on the map: 42.1315° N, 88.0263° W: Placed by OpenAirDocs at the center of ZIP code 60074, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4085
- Page: https://openairdocs.org/aircraft/N4085

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 (Flug & Fahrzeugwerke FFA HBV-DIAMANT 16.5)

None in force.

### Matched by engine (NONE)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N4085.

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Incident 19801011073669I](https://openairdocs.org/incident/19801011073669I), Oct 11, 1980: Farzwk DIAMANT165 (N4085), Benton, TN, Minor damage. Hard landing after experiencing restricted elevator control.

## 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 N4085

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N4085 before.

- [Cancelled 1952-12-04](https://openairdocs.org/deregistered/N4085-1952-12-04): Mooney M-18LA, S/N 122. Owner: [Mooney Aircraft Inc](https://openairdocs.org/faa-owner/MOONEY%20AIRCRAFT%20INC), [Wichita, KS](https://openairdocs.org/faa-place/KS/Wichita)
- [Cancelled 1937-12-15](https://openairdocs.org/deregistered/N4085-1937-12-15): American Airplane & Engine PILGRIM FC-2, S/N 56, built 1928. Owner: [F & S Aircraft Corp](https://openairdocs.org/faa-owner/F%20%26%20S%20AIRCRAFT%20CORP), [Philadelphia, PA](https://openairdocs.org/faa-place/PA/Philadelphia)

## Related

- Other Flug & Fahrzeugwerke FFA HBV-DIAMANT 16.5 aircraft: https://openairdocs.org/model/flug-fahrzeugwerke-ffa-hbv-diamant-16-5/aircraft.md
- The NONE engine: https://openairdocs.org/engine/none.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.