Helio H-391
16 on the U.S. register. Built from 1954 to 1958; half of them date from 1956 or earlier. Michigan has the most (4). 12% are registered to companies, flight schools, clubs and other organisations; the rest to individuals, who are not named here at this time.
About the H-391 from the FAA's model table
- Type
- Fixed-wing, single engine · Piston singles
- Power
- Piston (reciprocating), 1 engine
- Common engines
- Lycoming Go-435C&D Ser (8), Lycoming Go-435 (5), Lycoming Go-435-C2B2 (1)
- Seats
- 4
- Cruise speed
- about 117 mph
- Built of
- aluminium
- Maker on the register
- Helio
- Registered
- earliest certificate March 3, 1978; newest September 17, 2026
Where they are owner's state
Versions as the FAA records them · click one to list only those aircraft
| Version | Registered | Built | Share |
|---|---|---|---|
| H-391B | 16 | 1954 to 1958 | 100.0% |
Airworthiness certificate class
Biggest operators companies, schools and clubs
Largest fleets, as a table
| aircraft | |
|---|---|
| N62Hc LLC | 1 |
| Discovery Bay Aviation LLC | 1 |
Accident history NTSB records · 10 cases since 1982, 0 fatal
The 8 most recent of 10 cases where the NTSB's make and model match this family's versions. Each aircraft's own page also shows its record. How this model compares with others, with the fleet taken into account: Accidents by model in Aviation Analytics.
Questions people ask answers refresh every morning
How many Helio H-391 aircraft are registered in the U.S.?
16 as of October 30, 2026, counting 1 version the FAA records separately.
Which state has the most Helio H-391s?
Michigan, with 4.
Who owns the Helio H-391?
12% are registered to companies, flight schools, clubs and other organisations; the rest to individuals and co-owners, who are not named on this site at this time.
When were the Helio H-391s on the register built?
Between 1954 and 1958; half of them in 1956 or earlier.
How many Helio H-391 accidents has the NTSB recorded?
10 accidents and incidents since 1982, 0 of them fatal. A model flown more shows more; the accident analytics compare models per thousand registered.
What is the Helio H-391 made of?
The airframe is aluminium: sheet metal over a riveted frame, the way most aircraft have been built since the 1940s. The FAA's type certificate data sheet is the authority for any one model.
What the FAA has certified, ordered and been told about the Helio H-391 the component layer
The airframe is aluminium: sheet metal over a riveted frame, the way most aircraft have been built since the 1940s. The design is held under 1 type certificate (1A8, held by Helio Alaska INC.). The FAA has issued 11 airworthiness directives (orders that owners must comply with) that name this model, most of them about airframe structure. Operators and repair shops have filed 2 failure reports with the FAA since 2000, 2 of them in the last ten years: about 12.5 a year for every 100 aircraft on the register; the system most often named is propeller. 179 approved modifications exist for it, the most by Garmin International INC.
FAA orders 11 airworthiness directives · newest first
All orders naming the Helio H-391
By system
Orders by system, as a table
| orders | share | |
|---|---|---|
| Airframe structure | 5 | 45% |
| Other and general | 1 | 9% |
| Fuel system | 1 | 9% |
| Flight controls | 1 | 9% |
| Engine | 1 | 9% |
| Electrical power | 1 | 9% |
| Instruments and avionics | 1 | 9% |
Failure reports 2 since 2000 · what operators and shops told the FAA
Failure reports by year, as a table
| reports | |
|---|---|
| 00 | 2 |
By system
Parts most often reported as the reports name them
Latest reports
Approved replacement parts 166 parts manufacturer approvals
Parts a company other than the maker may make for this design and sell as FAA-approved. The companies holding the most:
Most often: strobe light (17), tail position (16), brake disc (14), self contained (10), brake lining (7), hose fitting (5), door hinge (4), passenger seats (3), cup (3), cone (3).
Approved modifications 179 supplemental type certificates
Changes the FAA has approved for this design, from new avionics and engines to floats and parachutes. The companies holding the most:
Latest
Certificates and bulletins
Safety bulletins 3 · advice, not orders
Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.
Connections how the H-391 links to the rest of the register
- Helio 120 aircraft on the register
- Helio H-391B 16 registered
- Built of aluminium
- Lycoming GO-435C&D series 8 of these aircraft · 260 hp
- Lycoming GO-435 5 of these aircraft · 210 hp
- Lycoming GO-435-C2B2 1 of these aircraft · 260 hp
- Michigan 4 of these aircraft
- Washington 3 of these aircraft
- Alaska 3 of these aircraft
- Vermont 2 of these aircraft
- California 2 of these aircraft
- N62Hc LLC 1 of these aircraft
- Discovery Bay Aviation LLC 1 of these aircraft
- NTSB accidents and incidents involving the H-391 10 cases since 1982 · 0 fatal
- FAA orders naming the H-391 11 airworthiness directives
- Failure reports filed on the H-391 2 reports since 1995
- Approved modifications for the H-391 179 supplemental type certificates
The whole map of how records connect · these connections as data: /graph/model/helio/h-391.json.
Aircraft newest certificates first · 16
| Tail no. | Maker and model | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|
| N565JS | Helio H-391B |
Individual owner Alaska |
Standard | 2026-09-17 | ValidFAA registration status code V: Valid registration. All codes |
| N62HC | Helio H-391B |
N62Hc LLC Nunica, Michigan |
None on file | 2025-09-15 | ValidFAA registration status code V: Valid registration. All codes |
| N10CJ | Helio H-391B |
Individual owner Alaska |
Standard | 2024-05-23 | ValidFAA registration status code V: Valid registration. All codes |
| N173K | Helio H-391B |
Individual owner Alaska |
Standard | 2023-09-07 | ValidFAA registration status code V: Valid registration. All codes |
| N289LM | Helio H-391B |
Individual owner Colorado |
Standard | 2023-01-17 | ValidFAA registration status code V: Valid registration. All codes |
| N4120D | Helio H-391B |
Individual owner Vermont |
Multiple | 2022-10-19 | ValidFAA registration status code V: Valid registration. All codes |
| N242B | Helio H-391B |
Individual owner Vermont |
Standard | 2022-09-16 | ValidFAA registration status code V: Valid registration. All codes |
| N4138D | Helio H-391B |
Co-owned owner California |
Standard | 2022-05-10 | ValidFAA registration status code V: Valid registration. All codes |
| N12620 | Helio H-391B |
Individual owner Michigan |
Standard | 2020-08-08 | ValidFAA registration status code V: Valid registration. All codes |
| N4139D | Helio H-391B |
Individual owner Washington |
Standard | 2014-12-15 | ValidFAA registration status code V: Valid registration. All codes |
| N8750R | Helio H-391B |
Discovery Bay Aviation LLC Port Townsend, Washington |
Standard | 2014-03-14 | ValidFAA registration status code V: Valid registration. All codes |
| N888W | Helio H-391B |
Individual owner California |
Standard | 2000-02-17 | ValidFAA registration status code V: Valid registration. All codes |
| N4431U | Helio H-391B |
Individual owner Michigan |
None on file | 1997-03-31 | ValidFAA registration status code V: Valid registration. All codes |
| N4119D | Helio H-391B |
Individual owner Michigan |
Standard | 1978-09-12 | ValidFAA registration status code V: Valid registration. All codes |
| N4123D | Helio H-391B |
Individual owner Washington |
Standard | 1978-03-03 | ValidFAA registration status code V: Valid registration. All codes |
| N4121D | Helio H-391B |
Individual owner Florida |
Standard | PendingFAA registration status code R: Registration pending. All codes |