Type Record · As of May 3, 2026
HELIO H-391B
Fixed Wing Single Engine · LYCOMING GO-435
Registered
16
Year Range
1954–1958
NTSB Events
17
Airworthiness Directives
6
Aircraft Resources
01 / Distribution
Where the fleet lives and was built
Counts of currently-registered HELIO H-391B aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.
By State (top 10)
- MI 25.0% 4
- WA 18.8% 3
- AK 12.5% 2
- VT 12.5% 2
- TX 12.5% 2
- CA 12.5% 2
- CO 6.3% 1
By Decade of Manufacture
- 1950s 75.0% 12
- Unknown 25.0% 4
02 / NTSB Records
Events involving HELIO H-391B aircraft
17 event(s) on file. Showing the most recent 17.
-
Aug 18, 2025
N4431UMonroe, Michigan
NTSB Docket → -
Jun 11, 2019
N10CJHope, Alaska
NTSB Docket → -
Oct 7, 1993
N173KBEAVER CREEK, Alaska
NTSB Docket → -
Aug 25, 1992
N4431UEDMONDS, Washington
NTSB Docket → -
Mar 23, 1991
N289LMPRESCOTT, Arizona
NTSB Docket → -
Nov 20, 1989
N8750RPLAINWELL, Michigan
NTSB Docket → -
Jun 27, 1985
N888WNEW ORLEANS, Louisiana Serious
NTSB Docket → -
Nov 19, 1983
N4431UHOOD RIVER, Oregon
NTSB Docket → -
Jun 5, 1983
N4119DCROTON, Michigan
NTSB Docket → -
Jun 28, 1980
N173KNORTHWAY, Alaska
NTSB Docket → -
Oct 17, 1973
N8750REAU CLAIRE, Wisconsin
NTSB Docket → -
May 28, 1972
N4431UNEW CASTLE, Kentucky Serious
NTSB Docket → -
Apr 10, 1971
N4123DANCHORAGE, Alaska
NTSB Docket → -
Aug 24, 1970
N4123DNINILCHIK, Alaska
NTSB Docket → -
Jan 7, 1969
N12620CUMBERLAND, Maryland
NTSB Docket → -
Aug 2, 1966
N173KVAN NUYS, California
NTSB Docket → -
Oct 10, 1964
N173KPERRY, Florida Minor
NTSB Docket →
03 / Airworthiness Directives
FAA directives applicable to HELIO H-391B
6 directive(s) on file. Showing the most recent 6.
-
Aug 17, 2020
Airworthiness Directives; Aspen Avionics, Inc.
The FAA is correcting an airworthiness directive (AD) that published in the Federal Register. The AD applies to certain Aspen Avionics, Inc., Evolution Flight Display (EFD) EFD1000 Emergency Backup Display, EFD1000 Multi-Function Display, and EFD1000 Primary Flight Display systems installed on various airplanes. As pu…
-
Jul 31, 2020
Airworthiness Directives; Aspen Avionics, Inc.
The FAA is adopting a new airworthiness directive (AD) for certain Aspen Avionics, Inc., Evolution Flight Display (EFD) EFD1000 Emergency Backup Display, EFD1000 Multi-Function Display, and EFD1000 Primary Flight Display systems installed on various airplanes. This AD imposes operating restrictions on these display sy…
-
Jan 23, 2019
Airworthiness Directives; Aspen Avionics, Inc., Evolution Flight Display Units
We are adopting a new airworthiness directive (AD) for certain Aspen Avionics, Inc. (Aspen), Evolution Flight Display (EFD) EFD1000 Primary Flight Display (PFD), EFD1000 Multi-Function Display (MFD), EFD1000 Emergency Backup Display (EBD), and EFD500 MFD units installed on various aircraft. This AD requires disabling…
-
Jun 26, 2003
Airworthiness Directives; Hartzell Propeller Inc. ( )HC-( )(2,3)(X,V)( )-( ) Series and HA-A2V20-1B Series Propellers with Aluminum Blades
This amendment revises an existing airworthiness directive (AD), that is applicable to Hartzell Propeller Inc. ( )HC-( )(2,3)(X,V)( )-( ) series and HA-A2V20-1B series propellers with aluminum blades. That AD currently requires initial and repetitive dye penetrant and eddy current inspections of the blade and an optic…
-
Jan 2, 2003
Airworthiness Directives; Hartzell Propeller Inc. ( )HC-( )(2,3)(X,V)( )-( ) Series and HA-A2V20-1B Series Propellers with Aluminum Blades
The Federal Aviation Administration (FAA) proposes to revise an existing airworthiness directive (AD), applicable to Hartzell Propeller Inc. ( )HC-( )(2,3)(X,V)( )-( ) series and HA-A2V20-1B series propellers with aluminum blades. That AD currently requires initial and repetitive dye penetrant and eddy current inspect…
-
Aug 27, 1997
Airworthiness Directives; Hartzell Propeller Inc. ( )HC-( )(2,3)(X,V)( )-( ) Series and HA-A2V20-1B Series Propellers With Aluminum Blades
This amendment supersedes four existing airworthiness directives (ADs), applicable to Hartzell Propeller Inc. ( )HC-( )(2,3)(X,V)( )-( ) series propellers with aluminum blades, that currently require inspections for cracks in blade shanks and clamps. This amendment requires initial and repetitive dye penetrant and edd…
04 / Type Certificate Data Sheets
FAA TCDS for HELIO H-391B
The TCDS is the legal certification document — weight limits, performance, equipment, AD compliance times, operating limitations. 1 match in the FAA catalog.
- 1A8 Historical Rev 34 · 10/13/2005
Helio Aircraft LLC
Models: H-295 (USAF U10D), H-391 (USAF UL-24), H-700, H-800 + 5 more
06 / Supplemental Type Certificates
Modifications approved for HELIO H-391B
255 STCs on file — every FAA-approved modification, alteration, or installation for this aircraft. STOL kits, avionics, fuel systems, floats, engine swaps, you name it.
-
04/01/2025
STC SA02738CH (PAGE 1)
Installation of L-3 Communications Avionics Systems
Acron Aviation Inc.
-
04/01/2025
STC SA04046CH Page 1
Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500)
Acron Aviation Inc.
-
09/26/2024
STC SA02594SE
SkyView HDX Instrumentation and Autopilot System manufactured
Dynon Avionics
-
08/30/2024
STC SA916SO
Installation of Cessna seat rails and seats.
Helio Alaska Inc.
-
08/27/2024
STC SA04837NY
Installation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lights
AeroLED's Holdings, LLC
-
08/21/2024
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Swift Fuels LLC
-
06/18/2024
STC SA04568CH
Installation of the uAvionix tailBeaconX, a tail mounted position light with integrated Automatic Dependent Surveillance - Broadcast (ADS-B) Out and 1090MHz Mode-S transponder func…
uAvionix Corporation
-
06/13/2024
STC SA02511SE (1 OF 3)
Installation of replacement fuel quantity indicator sending unit(s)
CiES Inc.
-
06/13/2024
STC SA02511SE (1 OF 2)
Installation of replacement fuel quantity indicator sending unit(s)
CiES Inc.
-
05/17/2024
STC SA4503NM (PAGE 1)
Remove original cloth covering and install Ceconite covering
Ceconite Division of Poly-Fiber Inc.
-
02/02/2024
STC SA02658SE (1 OF 2)
Installation of Garmin GI 275 Multi-Function Display System
Garmin International Inc.
-
12/12/2023
STC SA02571SE (PAGE 1)
Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).
Garmin International Inc.
-
10/10/2023
STC SA01899WI
Installation of Garmin G3X Touch Electronic Flight Instrument System
Garmin International Inc.
-
12/12/2022
STC SA02738CH (PAGE 1)
Installation of L-3 Communications Avionics Systems
L3Harris Aviation Products Inc.
-
12/12/2022
STC SA04046CH Page 1
Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500)
L3Harris Aviation Products Inc.
-
10/12/2022
STC SA02594SE
SkyView HDX Instrumentation and Autopilot System manufactured
Dynon Avionics
-
09/09/2022
STC SA4503NM (PAGE 1)
Install Ceconite covering material.
Ceconite Division of Poly-Fiber Inc
-
09/01/2022
STC SA01967WI (2 OF3)
Use of GAMI G100UL High Octane Unleaded Avgas
General Aviation Modifications Inc.
-
07/27/2022
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Swift Fuels LLC
-
07/06/2022
STC SA02203AK (PAGE 1)
Installation of FlightLogic Synthetic Vision Electronic Flight Information System (EFIS-SV).
Genesys Aerosystems Inc.
-
06/06/2022
STC SA02203AK (PAGE 1)
Installation of FlightLogic Synthetic Vision Electronic Flight Information System (EFIS-SV).
Genesys Aerosystems Inc.
-
05/19/2022
STC SA04776NY (1 OF 2)
The HIPEC Covering and Finishing System must be performed and maintained
HIPEC Aircraft Coatings Inc.
-
03/30/2022
STC SA02444AK (PAGE 1)
Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed
ADS-B Technologies LLC
-
03/30/2022
STC SA04568CH
Installation of the uAvionix tailBeaconX, a tail mounted position light with integrated Automatic Dependent Surveillance - Broadcast (ADS-B) Out and 1090MHz Mode-S transponder func…
uAvionix Corporation
-
02/02/2022
STC SA02571SE (PAGE 1)
Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).
Garmin International Inc
-
01/05/2022
STC SA02594SE
SkyView HDX Instrumentation and Autopilot System manufactured
Dynon Avionics
-
12/29/2021
STC SA01899WI
Installation of Garmin G3X Touch Electronic Flight Instrument System
Garmin International Inc
-
12/20/2021
STC SA02594SE
SkyView HDX Instrumentation and Autopilot System manufactured
Dynon Avionics
-
09/28/2021
STC SA01818WI
Installation of Garmin G5 Electronic Flight Instrument
Garmin International Inc.
-
09/01/2021
STC SA09902AC
Installation of BendixKing KFD 900 Flight Display System
Honeywell International Inc. (Bendix King)
+ 225 more STCs on file
07 / PMA replacement parts
FAA-approved replacement parts for HELIO H-391B
1 parts on file from the FAA Parts Manufacturer Approval database. Each is a non-OEM part the FAA has authorized for use as a replacement on this aircraft type.
-
2B6-47#https://drs.faa.gov/browse/excelExternalWindow/01DA3C9FA5B35B0C8625792D0056E438.0001##
Airborne fuel pump
JAARS Inc replaces Modification Part
PMA holder →
04 / Regulations watching this type
Advisory Circulars and Federal Register activity for HELIO H-391B
Advisory Circulars
No ACs explicitly mention this type. Showing universal operating-rule ACs that apply to all aircraft.
Recent Federal Register activity
Latest rulemakings touching general operating rules (Part 91) and maintenance rules (Part 43).
- 2026-04-17 Settlement Policy for Small Unmanned Aircraft System (UAS) Cases FR ↗
- 2026-02-10 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period; Denial of Extension FR ↗
- 2026-02-02 25-Hour Cockpit Voice Recorder (CVR) Requirement, New Aircraft Production FR ↗
- 2026-01-28 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period FR ↗
- 2026-01-07 Requirements for Interference-Tolerant Radio Altimeter Systems FR ↗
05 / Aircraft of this type
All 16 registered N-numbers
Every tail currently on the FAA registry for this make/model. Click an N-number to query the FAA Aircraft Inquiry; rows flagged ● have NTSB events on file. Tails seeded with full TallyAero pages link directly.
| N-number | St | Year | NTSB | FAA |
|---|---|---|---|---|
| N10CJ | AK | 1958 | ● | Look up ↗ |
| N12620 | MI | 1956 | ● | Look up ↗ |
| N173K | AK | — | ● | Look up ↗ |
| N242B | VT | 1954 | · | Look up ↗ |
| N289LM | CO | 1956 | ● | Look up ↗ |
| N4119D | MI | 1956 | ● | Look up ↗ |
| N4120D | VT | 1957 | · | Look up ↗ |
| N4121D | TX | 1957 | · | Look up ↗ |
| N4123D | WA | 1957 | ● | Look up ↗ |
| N4138D | CA | 1958 | · | Look up ↗ |
| N4139D | WA | 1958 | · | Look up ↗ |
| N4431U | MI | — | ● | Look up ↗ |
| N565JS | TX | 1956 | · | Look up ↗ |
| N62HC | MI | — | · | Look up ↗ |
| N8750R | WA | — | ● | Look up ↗ |
| N888W | CA | 1956 | ● | Look up ↗ |
Source — FAA Aircraft Registry · click "Look up" to query the live registry record (owner, address, last airworthiness)
05 / Sources & Methodology
Every count traces back to a primary US-government source
- FAA Aircraft Registry →
Refreshed Apr 27, 2026
Available
- NTSB CAROL →
Refreshed Apr 27, 2026
Available
- Federal Register (FAA Airworthiness Directives) →
Refreshed Apr 27, 2026
Available
We render counts and lists as the agency publishes them. Read the methodology →