# N399MD: 1984 Helio H800

- Status: Valid registration
- Airframe: [Helio H800](https://openairdocs.org/model/helio-h800) (registry code 4300500, 2 seats)
- Engine: [Lycoming I0360 SER A&C](https://openairdocs.org/engine/lycoming-i0360-ser-a-c) (registry code 41511)
- Data sheets: [TCDS 1A8](https://openairdocs.org/tcds/1A8) (Helio Alaska Inc.) (OpenAirDocs)
- Serial number: H-18
- Year built: 1984
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: April 15, 1993
- Certificate issued: December 14, 2015
- Expires: December 31, 2028
- Mode S code: A4A54F
- Registered owner: [Rusyniak Anthony John](https://openairdocs.org/faa-owner/RUSYNIAK%20ANTHONY%20JOHN)
- Location: [Syracuse, NY](https://openairdocs.org/faa-place/NY/Syracuse)
- Owner type: Individual
- Owner's area on the map: 43.0787° N, 76.1452° W: Placed by OpenAirDocs at the center of ZIP code 13208, 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=399MD
- Page: https://openairdocs.org/aircraft/N399MD

From the FAA registry file of October 21, 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): 3 in force

### Matched by airframe (Helio H800)

- [AD 2005-01-19](https://openairdocs.org/ad/2005-01-19): Mode S transponders · GARMIN International GTX 330D, GTX 330, GTX 33D and 830 more. Effective Feb 23, 2005
- [AD 87-04-09](https://openairdocs.org/ad/87-04-09): Landing Gear Legs · Helio H-700 and H-800. Effective Mar 9, 1987
- [AD 79-07-02](https://openairdocs.org/ad/79-07-02): Batteries · Aircraft Parts & Development A, A-2, A-3 and 149 more. Effective Apr 3, 1979

### Matched by engine (Lycoming I0360 SER A&C)

None in force.

## Information bulletins (advisory) (2 in force)

- [SAIB SW-18-31](https://openairdocs.org/saib/SW-18-31): NAVIGATION, ATTITUDE, AND DIRECTION DATA SYSTEM. Issued Nov 21, 2018
- [SAIB CE-08-47](https://openairdocs.org/saib/CE-08-47): Wings - Attachment Fittings. Issued Sep 9, 2008

## NTSB investigations

None matched to N399MD.

## FAA accident and incident reports

None matched to N399MD.

## Service difficulty reports

None filed for this aircraft.

## Related

- Other Helio H800 aircraft: https://openairdocs.org/model/helio-h800/aircraft.md
- STCs for the Helio H800: https://openairdocs.org/model/helio-h800/stcs.md
- The Lycoming I0360 SER A&C engine: https://openairdocs.org/engine/lycoming-i0360-ser-a-c.md

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