# Helio H-391B

- Type: Aircraft model (FAA registry)
- Registry code: 4300106
- Manufacturer (registry): HELIO
- Model: H-391B
- Aircraft type: Fixed wing single engine
- Category: Airplane
- Engines: 1 · Reciprocating
- Seats: 4
- Weight class: Up to 12,499 lb
- Cruise speed: 117 mph
- Certification: Type certificated
- Data sheet: [TCDS 1A8](https://openairdocs.org/tcds/1A8) (OpenAirDocs)
- Holder: Helio Alaska Inc.
- Registered aircraft: 16
- Page: https://openairdocs.org/model/helio-h-391b

Model codes come from the FAA registry's reference file. ADs are matched to them by model name and maker.

## ADs that may apply (OpenAirDocs)

Matched to this model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment.

- [AD 2022-03-15](https://openairdocs.org/ad/2022-03-15): Fuel Quantity Indicator · Garmin G3X Touch Electronic Flight Instrument System (STC SA01899WI or SA02658SE). Effective Mar 21, 2022
- [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 82-16-08](https://openairdocs.org/ad/82-16-08): Left and Right Main Spar Carry-Thru Assembly · Helio H-250, H-295 (USAF U10D), H-391 (USAF UL-24) and 4 more. Effective Aug 3, 1982
- [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
- [AD 63-18-02](https://openairdocs.org/ad/63-18-02): Engine Breather · Helio H-391B, H-395 (USAF L-28A or U-10B) and H-395A. Effective Sep 1, 1963
- [AD 59-17-06](https://openairdocs.org/ad/59-17-06): Pulley Guards · Helio H-391B and H-395 (USAF L-28A or U-10B)
- [AD 59-17-05](https://openairdocs.org/ad/59-17-05): Horizontal Tail Spar Fitting · Helio H-391B and H-395 (USAF L-28A or U-10B)
- [AD 58-25-04](https://openairdocs.org/ad/58-25-04): Fin Hinge Attachment · Helio H-391B and H-395 (USAF L-28A or U-10B)
- [AD 58-01-04](https://openairdocs.org/ad/58-01-04): Aileron Bellcrank Inspection · Helio H-391B
- [AD 57-25-02](https://openairdocs.org/ad/57-25-02): Fin Spar Inspection · Helio H-391B
- [AD 56-22-02](https://openairdocs.org/ad/56-22-02): Wing Attachment Washers · Helio H-391B

## Information bulletins (advisory) (3)

- [SAIB SW-18-31](https://openairdocs.org/saib/SW-18-31): NAVIGATION, ATTITUDE, AND DIRECTION DATA SYSTEM. Issued Nov 21, 2018
- [SAIB CE-18-14](https://openairdocs.org/saib/CE-18-14): Main Landing Gear: Improved inspection at Drag Brace Location. Issued May 9, 2018
- [SAIB CE-08-47](https://openairdocs.org/saib/CE-08-47): Wings - Attachment Fittings. Issued Sep 9, 2008

## Registered aircraft (16)

- [N10CJ](https://openairdocs.org/aircraft/N10CJ): [Zareefeh Christopher](https://openairdocs.org/faa-owner/ZAREEFEH%20CHRISTOPHER), [Fairbanks, AK](https://openairdocs.org/faa-place/AK/Fairbanks), built 1958, S/N 099
- [N12620](https://openairdocs.org/aircraft/N12620): [Lapoint Paul E](https://openairdocs.org/faa-owner/LAPOINT%20PAUL%20E), [Drummond Island, MI](https://openairdocs.org/faa-place/MI/Drummond%20Island), built 1956, S/N 028
- [N173K](https://openairdocs.org/aircraft/N173K): [Wikle Artic C](https://openairdocs.org/faa-owner/WIKLE%20ARTIC%20C), [Wasilla, AK](https://openairdocs.org/faa-place/AK/Wasilla), S/N 074
- [N242B](https://openairdocs.org/aircraft/N242B): [Clark Kyle B](https://openairdocs.org/faa-owner/CLARK%20KYLE%20B), [Underhill, VT](https://openairdocs.org/faa-place/VT/Underhill), built 1954, S/N 001
- [N289LM](https://openairdocs.org/aircraft/N289LM): [Hawkins Lynn A](https://openairdocs.org/faa-owner/HAWKINS%20LYNN%20A), [Franktown, CO](https://openairdocs.org/faa-place/CO/Franktown), built 1956, S/N 036
- [N4119D](https://openairdocs.org/aircraft/N4119D): [Tomanica Jack L](https://openairdocs.org/faa-owner/TOMANICA%20JACK%20L), [Nunica, MI](https://openairdocs.org/faa-place/MI/Nunica), built 1956, S/N 043
- [N4120D](https://openairdocs.org/aircraft/N4120D): [Clark Kyle B](https://openairdocs.org/faa-owner/CLARK%20KYLE%20B), [Underhill, VT](https://openairdocs.org/faa-place/VT/Underhill), built 1957, S/N 044
- [N4121D](https://openairdocs.org/aircraft/N4121D): [Weirsdale, FL](https://openairdocs.org/faa-place/FL/Weirsdale), built 1957, S/N 041, Registration pending
- [N4123D](https://openairdocs.org/aircraft/N4123D): [Thun Karl J](https://openairdocs.org/faa-owner/THUN%20KARL%20J), [Graham, WA](https://openairdocs.org/faa-place/WA/Graham), built 1957, S/N 042
- [N4138D](https://openairdocs.org/aircraft/N4138D): [Cargill Stephen A](https://openairdocs.org/faa-owner/CARGILL%20STEPHEN%20A), [Vacaville, CA](https://openairdocs.org/faa-place/CA/Vacaville), built 1958, S/N 090
- [N4139D](https://openairdocs.org/aircraft/N4139D): [Perry Jim](https://openairdocs.org/faa-owner/PERRY%20JIM), [Monroe, WA](https://openairdocs.org/faa-place/WA/Monroe), built 1958, S/N 088
- [N4431U](https://openairdocs.org/aircraft/N4431U): [Dechert Barry E](https://openairdocs.org/faa-owner/DECHERT%20BARRY%20E), [South Rockwood, MI](https://openairdocs.org/faa-place/MI/South%20Rockwood), S/N 091
- [N565JS](https://openairdocs.org/aircraft/N565JS): [Yundt Joshua J](https://openairdocs.org/faa-owner/YUNDT%20JOSHUA%20J), [Wasilla, AK](https://openairdocs.org/faa-place/AK/Wasilla), built 1956, S/N 039
- [N62HC](https://openairdocs.org/aircraft/N62HC): [N62hc LLC](https://openairdocs.org/faa-owner/N62HC%20LLC), [Nunica, MI](https://openairdocs.org/faa-place/MI/Nunica), S/N 062
- [N8750R](https://openairdocs.org/aircraft/N8750R): [Discovery Bay Aviation LLC](https://openairdocs.org/faa-owner/DISCOVERY%20BAY%20AVIATION%20LLC), [Port Townsend, WA](https://openairdocs.org/faa-place/WA/Port%20Townsend), S/N 009
- [N888W](https://openairdocs.org/aircraft/N888W): [Kennedy Craig D](https://openairdocs.org/faa-owner/KENNEDY%20CRAIG%20D), [Santee, CA](https://openairdocs.org/faa-place/CA/Santee), built 1956, S/N 029

## NTSB investigations (38)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CEN25LA325](https://openairdocs.org/ntsb/CEN25LA325), Aug 18, 2025: Helio H-391B (N4431U), Monroe, MI, substantial damage. Probable cause: The pilot’s failure to maintain directional control during the landing roll with a crosswind.
- [NTSB ANC19LA027](https://openairdocs.org/ntsb/ANC19LA027), Jun 12, 2019: Helio H391 (N10CJ), Hope, AK, substantial damage. Probable cause: The pilot’s failure to maintain directional control during a precautionary landing, which resulted in a ground loop. Contributing to the accident was a partial loss of engine power for reasons that…
- [NTSB DEN02LA048](https://openairdocs.org/ntsb/DEN02LA048), May 24, 2002: Helio H-391B (N25BA), Cheyenne, WY, substantial damage. Probable cause: the pilot's failure to maintain directional control.
- [NTSB ANC01LA066](https://openairdocs.org/ntsb/ANC01LA066), Jun 2, 2001: Helio H-391B (N25BA), Anvik, AK, substantial damage. Probable cause: The pilot's continued operation of the accident airplane with known equipment deficiencies, and an improper installation of the float assembly by maintenance personnel. A factor in the accident was…
- [NTSB ATL94LA054](https://openairdocs.org/ntsb/ATL94LA054), Feb 26, 1994: Helio HE391B (N9050R), Saluda, SC, substantial damage. Probable cause: THE PILOT'S AND MECHANIC'S FAILURE TO ADEQUATELY INSPECT THE AIRCRAFT FUEL SYSTEM WHICH RESULTED IN FUEL STARVATION.
- [NTSB ANC94LA007](https://openairdocs.org/ntsb/ANC94LA007), Oct 8, 1993: Helio H-391-B (N173K), Beaver Creek, AK, substantial damage. Probable cause: THE PILOT'S FAILURE TO MAINTAIN THE REQUIRED AIRSPEED DURING THE EMERGENCY DESCENT AS PUBLISHED IN THE PILOT'S MANUAL. A FACTOR IS THE LOSS OF ENGINE POWER FOR UNDETERMINED REASONS.
- [NTSB SEA92LA191](https://openairdocs.org/ntsb/SEA92LA191), Aug 26, 1992: Helio H-391B (N4431U), Edmonds, WA, destroyed. Probable cause: THE PARTIAL LOSS OF ENGINE POWER WHEN AN EXHAUST VALVE SEIZED IN THE OPEN POSITION AND THE WATER WHERE THE PILOT WAS FORCED TO LAND, WHICH RESULTED IN AN ACFT NOSE OVER ON TOUCHDOWN.
- [NTSB LAX91LA144](https://openairdocs.org/ntsb/LAX91LA144), Mar 23, 1991: Helio H391B (N289LM), Prescott, AZ, substantial damage. Probable cause: THE PILOT'S FAILURE TO MAINTAIN DIRECTIONAL CONTROL AND IMPROPER USE OF THE FLIGHT CONTROLS. CONTRIBUTING TO THIS ACCIDENT WAS THE CROSS WIND AND SOFT TERRAIN, AND THE PILOT'S LACK OF EXPERIENCE IN…
- [NTSB ANC90LA178](https://openairdocs.org/ntsb/ANC90LA178), Sep 13, 1990: Helio H-391B (N316HW), Circle, AK, substantial damage. Probable cause: PILOT-IN-COMMAND'S FAILURE TO MAINTAIN AIRPLANE CONTROL AND THE PILOT'S FAILURE TO IDENTIFY THE STALL.
- [NTSB CHI90LA031](https://openairdocs.org/ntsb/CHI90LA031), Nov 20, 1989: Helio H-391B (N8750R), Plainwell, MI, substantial damage. Probable cause: FAILURE OF THE CROSSWIND LANDING GEAR SYSTEM TO ENGAGE ON THE LEFT MAIN GEAR DUE TO IMPROPER RIGGING ADJUSTMENT BY MAINTENANCE PERSONNEL. FACTORS RELATED TO THE ACCIDENT WERE: UNFAVORABLE WIND…
- [NTSB DEN86LA040](https://openairdocs.org/ntsb/DEN86LA040), Dec 6, 1985: Helio H-391B (N4101D), Bozeman, MT, substantial damage
- [NTSB SEA84LA026](https://openairdocs.org/ntsb/SEA84LA026), Nov 19, 1983: Helio H-391B (N4431U), Hood River, OR, substantial damage
- [NTSB CHI83LA248](https://openairdocs.org/ntsb/CHI83LA248), Jun 5, 1983: Helio H-391B (N4119D), Croton, MI, substantial damage
- [NTSB SEA82FYE30](https://openairdocs.org/ntsb/SEA82FYE30), May 29, 1981: Helio H-391B (N316HW), Bellingham, WA, substantial damage
- [NTSB ANC80FAA15](https://openairdocs.org/ntsb/ANC80FAA15), Jun 28, 1980: Helio Acft H-250 (N173K), Northway, AK, substantial damage
- [NTSB ANC78DAH04](https://openairdocs.org/ntsb/ANC78DAH04), Jul 26, 1978: Helio Acft 391B (N6023), Iliamna, AK, substantial damage
- [NTSB NYC78FGM07](https://openairdocs.org/ntsb/NYC78FGM07), Oct 28, 1977: Helio Acft 391 (N4169D), Bedford, PA, substantial damage
- [NTSB ANC77DAH05](https://openairdocs.org/ntsb/ANC77DAH05-201360), Oct 23, 1976: Helio Acft H-391B (N4144D), Anchorage, AK, substantial damage
- [NTSB CHI74FEP20](https://openairdocs.org/ntsb/CHI74FEP20), Oct 17, 1973: Helio Acft H-391B (N8750R), Eau Claire, WI, substantial damage
- [NTSB FTW73FQD12](https://openairdocs.org/ntsb/FTW73FQD12), Dec 30, 1972: Helio Acft H-391B (N316HW), El Paso, TX, substantial damage
- [NTSB ANC73DAG34](https://openairdocs.org/ntsb/ANC73DAG34), Aug 9, 1972: Helio Acft H-391B (N74037), Chitina, AK, substantial damage
- [NTSB ANC71DAG83](https://openairdocs.org/ntsb/ANC71DAG83), Apr 10, 1971: Helio H391B (N4123D), Anchorage, AK, substantial damage
- [NTSB NYC71DFA35](https://openairdocs.org/ntsb/NYC71DFA35), Jan 3, 1971: Helio Acft H-391 (N4169D), Malone, NY, substantial damage
- [NTSB ANC71DAG19](https://openairdocs.org/ntsb/ANC71DAG19), Aug 24, 1970: Helio Acft H-391B (N4123D), Ninilchik, AK, substantial damage
- [NTSB SEA70D0134](https://openairdocs.org/ntsb/SEA70D0134), Oct 7, 1969: Helio Acft H-391B (N6025), Reedsport, OR, substantial damage
- [NTSB DIA69F0128](https://openairdocs.org/ntsb/DIA69F0128), Jan 7, 1969: Helio H-391B (N12620), Cumberland, MD, substantial damage
- [NTSB NYC69A0008](https://openairdocs.org/ntsb/NYC69A0008), Jul 10, 1968: Helio H-391B (N28B), Royalston, MA, destroyed, 2 fatal
- [NTSB NYC69A0008](https://openairdocs.org/ntsb/NYC69A0008), Jul 10, 1968: Helio Acft H-391B (N28B), Royalston, MA, destroyed, 2 fatal
- [NTSB MIA68F0266](https://openairdocs.org/ntsb/MIA68F0266), Oct 26, 1967: Helio Acft H-391B (N4135D), Lithonia, GA, substantial damage
- [NTSB OAK67F0166](https://openairdocs.org/ntsb/OAK67F0166), Nov 15, 1966: Helio Acft H-391B (N4109D), Oakland, CA, substantial damage
- [NTSB NYC67F0343](https://openairdocs.org/ntsb/NYC67F0343), Oct 23, 1966: Helio H-391B (N6022), Fisher, NY, substantial damage
- [NTSB NYC67F0308](https://openairdocs.org/ntsb/NYC67F0308), Oct 20, 1966: Helio H-391B (N6021), Manville, NJ, substantial damage
- [NTSB LAX67F0059](https://openairdocs.org/ntsb/LAX67F0059), Aug 2, 1966: Helio H-391B (N173K), Van Nuys, CA, substantial damage
- [NTSB DEN66D0315](https://openairdocs.org/ntsb/DEN66D0315), May 15, 1966: Helio Acft H395 (N4200B), Cliff, NM, substantial damage
- [NTSB NYC66F0638](https://openairdocs.org/ntsb/NYC66F0638), Apr 17, 1966: Helio H-391 (N6022), Orangeburg, NY, substantial damage
- [NTSB NYC66D0232](https://openairdocs.org/ntsb/NYC66D0232), Sep 6, 1965: Helio 391B (N74037), Livingston Mnr, NY, substantial damage
- [NTSB SEA66A0014](https://openairdocs.org/ntsb/SEA66A0014), Aug 19, 1965: Helio Acft H-391B (N4132D), Mead, WA, destroyed, 1 fatal
- [NTSB UNK65X0217](https://openairdocs.org/ntsb/UNK65X0217), Oct 10, 1964: Helio 391B (N173K), Perry, FL, substantial damage

## FAA accident and incident reports (19)

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.

- [Accident 20250818013389A](https://openairdocs.org/incident/20250818013389A), Aug 18, 2025: Helio H-391B (N4431U), Monroe, MI, Substantial damage. Pilot lost control attempting to land with a crosswind. The aircraft turned 90 degrees right into the wind and skidded on the left main wheel. Upon exiting the…
- [Accident 20190611006639A](https://openairdocs.org/incident/20190611006639A), Jun 11, 2019: Helio H-391B (N10CJ), Hope, AK, Substantial damage. On June 11, 2019, at 2230 AKDT, N10CJ, a Helio courier H391-B, was substantially damaged when the pilot attempted a precautionary landing at an unmaintained…
- [Accident 20020524011099A](https://openairdocs.org/incident/20020524011099A), May 24, 2002: Helio H391B (N25BA), Cheyenne, WY, No damage. (-23) The pilot lost control of the aircraft on the runway just prior to take off. Gusting crosswinds prevailed at the time.
- [Accident 20010602029919A](https://openairdocs.org/incident/20010602029919A), Jun 2, 2001: Helio H391B (N25BA), Anvik, AK, Substantial damage. (-23) On June 2, 2001, at about 0930. Aircraft N25BA a float-equipped Helio courier H391B sustained substantial damage during an aborted takeoff from the Anvik…
- [Accident 19940226003029A](https://openairdocs.org/incident/19940226003029A), Feb 26, 1994: N9050R, Saluda, SC, Substantial damage. Lost power en route. Landed on Private strip. Nosed over. Left fuel cap leaked. Prevented gravity fuel flow.
- [Accident 19931007039779A](https://openairdocs.org/incident/19931007039779A), Oct 7, 1993: Helio H391B (N173K), Beaver Creek, AK, Substantial damage. Lost power en route. Crashed in a Creek trying for a sandbar. Too slow slats extended. Shortened glide.
- [Accident 19920825050879A](https://openairdocs.org/incident/19920825050879A), Aug 25, 1992: Helio H391B (N4431U), Everett, WA, Destroyed. Lost partial power. Unable reach airport. Ditched in bay. NR4 exhaust valve was seized in open position.
- [Accident 19910323007469A](https://openairdocs.org/incident/19910323007469A), Mar 23, 1991: Helio H391B (N289LM), Prescott, AZ, Substantial damage. Lost directional control on takeoff roll. Veered into crosswind. Left runway and ground looped.
- [Accident 19900913039569A](https://openairdocs.org/incident/19900913039569A), Sep 13, 1990: Helio H391B (N316HW), Circle, AK, Substantial damage. Failed to accelerate after liftoff from gravel bar. Settled in alders at end of bar.
- [Accident 19891120046499A](https://openairdocs.org/incident/19891120046499A), Nov 20, 1989: Helio H391B (N8750R), Plainwell, MI, Substantial damage. Veered off runway on gusty crosswind landing. Left gear collapsed in ditch. Crosswind gear lock rigged improperly.
- [Accident 19851206061059A](https://openairdocs.org/incident/19851206061059A), Dec 6, 1985: Helio H391B (N4101D), Bozeman, MT, Substantial damage. Magnetos grounded, p lead insulation worn, shorted out. Should have turned off master switch when smelled smoke.
- [Accident 19831119063709A](https://openairdocs.org/incident/19831119063709A), Nov 19, 1983: Helio H391B (N4431U), Hood River, OR, Substantial damage. Pilot gound looped aircraft during landing when he attempted high speed turn off of runway.
- [Accident 19830605022689A](https://openairdocs.org/incident/19830605022689A), Jun 5, 1983: Helio H391B (N4119D), Croton, MI, Substantial damage. Struck powerlines on approach to a water landing into a lake.
- [Accident 19810522031239A](https://openairdocs.org/incident/19810522031239A), May 22, 1981: Helio H391B (N316HW), Bellingham, WA, Substantial damage. Had crosswind gear in improper position for crosswind landing. Failed to check. Side load collapsed landing gear.
- [Accident 19800628023769A](https://openairdocs.org/incident/19800628023769A), Jun 28, 1980: Helio H391B (N173K), Northway, AK, Substantial damage. Unskilled in type. Tried to turn around on landing roll-out. Lost control. Ground-looped.
- [Accident 19780726026709A](https://openairdocs.org/incident/19780726026709A), Jul 26, 1978: Helio H391 (N6023), Iliamna, AK, Substantial damage
- [Accident 19771028035009A](https://openairdocs.org/incident/19771028035009A), Oct 28, 1977: Helio H391 (N4169D), Bedford, PA, Substantial damage. Ac contacted runway during gnd loop.
- [Accident 19761023032269A](https://openairdocs.org/incident/19761023032269A), Oct 23, 1976: Helio H391B (N4144D), Anchorage, AK, Substantial damage. Lnd due enroute wea.
- [Accident 19731017034519A](https://openairdocs.org/incident/19731017034519A), Oct 17, 1973: Helio H391B (N8750R), Eau Claire, WI, Substantial damage. Plt had flown 8 hrs in last 24 hr period veered l initiated goarnd held r rudder too long.

## Service difficulty reports (2)

As reported by operators and repair stations, by the model named in the report.

- [SDR 20001016SH027](https://openairdocs.org/sdr/20001016SH027), Sep 12, 2000: BLADE. DAMAGED. PROPELLER WAS BEING SERVICED DURING AN ANNUAL 100-HOUR INSPECTION. WHILE ATTEMPTING TO GREASE THE PROPELLER, WATER WAS FOUND STREAMING FROM THE BLADE CLAMPS. PR
- [SDR 20001016SH026](https://openairdocs.org/sdr/20001016SH026), Sep 12, 2000: BLADE. DAMAGED. PROPELLER WAS BEING SERVICED DURING AN ANNUAL 100-HOUR INSPECTION. WHILE ATTEMPTING TO GREASE THE PROPELLER, WATER WAS FOUND STREAMING FROM THE BLADE CLAMPS. PR

## STCs that may be installed (OpenAirDocs) (126, first 50)

Approved for this model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has.

- [STC SA02571SE](https://openairdocs.org/stc/SA02571SE): Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display). Garmin International Inc
- [STC SA01800SE](https://openairdocs.org/stc/SA01800SE): Fabrication and installation of new or replacement of existing instrument panel lights dimmer control. TCW Technologies, LLC
- [STC SA01861SE](https://openairdocs.org/stc/SA01861SE): Fabrication and installation of Landing Light Controller. TCW Technologies, LLC
- [STC SA04837NY](https://openairdocs.org/stc/SA04837NY): Installation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lights. AeroLED's Holdings, LLC
- [STC SA12406WI](https://openairdocs.org/stc/SA12406WI): Installation of a Garmin AXIS Flight Display System. Garmin International Inc
- [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC
- [STC SA02636SE](https://openairdocs.org/stc/SA02636SE): Installation of Garmin GPS 175 Navigation System and GNX 375 Navigation System with ADS-B In/Out Transponder. Garmin International Inc
- [STC SA02019SE-D](https://openairdocs.org/stc/SA02019SE-D): Installation of Garmin Model GTN 625/635/650; 725/750 Navigation System. Garmin International Inc
- [STC SA800EA](https://openairdocs.org/stc/SA800EA): Installation of Whelen Anti-Collision, Position, or Anti-Collision/Position Light System, and applicable associated power supplies. Whelen Aerospace Technologies
- [STC SA02511SE](https://openairdocs.org/stc/SA02511SE): Installation of replacement fuel quantity indicator sending unit(s). CiES Inc
- [STC SA02738CH](https://openairdocs.org/stc/SA02738CH): Installation of L-3 Communications Avionics Systems. Acron Aviation Inc
- [STC SA04046CH PAGE 1](https://openairdocs.org/stc/SA04046CH%20PAGE%201): Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500). Acron Aviation Inc
- [STC SA02594SE](https://openairdocs.org/stc/SA02594SE): SkyView HDX Instrumentation and Autopilot System manufactured. Dynon Avionics
- [STC SA916SO](https://openairdocs.org/stc/SA916SO): Installation of Cessna seat rails and seats. Helio Alaska Inc
- [STC SA01757WI](https://openairdocs.org/stc/SA01757WI): To allow the use of UL91 or UL94 (minimum) grade aviation fuel. Swift Fuels LLC
- [STC SA04568CH](https://openairdocs.org/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 functionality. uAvionix Corporation
- [STC SA02658SE](https://openairdocs.org/stc/SA02658SE): Installation of Garmin GI 275 Multi-Function Display System. Garmin International Inc
- [STC SA01899WI](https://openairdocs.org/stc/SA01899WI): Installation of Garmin G3X Touch Electronic Flight Instrument System. Garmin International Inc
- [STC SA01967WI](https://openairdocs.org/stc/SA01967WI): Use of GAMI G100UL High Octane Unleaded Avgas. General Aviation Modifications Inc
- [STC SA02203AK](https://openairdocs.org/stc/SA02203AK): Installation of FlightLogic Synthetic Vision Electronic Flight Information System (EFIS-SV). Genesys Aerosystems Inc
- [STC SA04776NY](https://openairdocs.org/stc/SA04776NY): The HIPEC Covering and Finishing System must be performed and maintained. HIPEC Aircraft Coatings Inc
- [STC SA02444AK](https://openairdocs.org/stc/SA02444AK): Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed. ADS-B Technologies LLC
- [STC SA01818WI](https://openairdocs.org/stc/SA01818WI): Installation of Garmin G5 Electronic Flight Instrument. Garmin International Inc
- [STC SA09902AC](https://openairdocs.org/stc/SA09902AC): Installation of BendixKing KFD 900 Flight Display System. Honeywell International Inc. (Bendix King)
- [STC SA11174SC PAGE 1](https://openairdocs.org/stc/SA11174SC%20PAGE%201): Installation of BendixKing by Honeywell KSN 770 and KSN 765 WAAS LPV approach capable nav/comm systems. Honeywell International Inc (Bendix King)
- [STC SA10822SC](https://openairdocs.org/stc/SA10822SC): Installation of EFD1000 Primary Flight Display. Aspen Avionics Inc
- [STC SA00401BO](https://openairdocs.org/stc/SA00401BO): Installation of a SkyTrax100B UAT receiver. Avidyne Corporation
- [STC SA00410BO](https://openairdocs.org/stc/SA00410BO): Installation of an AV-30-C Multi-Mode Indicator. uAvionix Corporation
- [STC SA01831WI](https://openairdocs.org/stc/SA01831WI): To allow the use of UL91 (minimum) grade aviation fuel. Petersen Aviation Inc
- [STC SA10236SC](https://openairdocs.org/stc/SA10236SC): Installation of a GDC 31 Roll Steering Converter. DAC International Inc
- [STC SA01714WI](https://openairdocs.org/stc/SA01714WI): Installation of a Garmin transponders: (a) GTX 330/330D/33/33D with ADS-B Out functionality; (b) GTX 335/335R/345/345R with ADS-B Out and In functionality; or (c) GTX 335R/345R with ADS-B Out functionality in select airplanes installed with G950/G1000 systems. Garmin International Inc
- [STC SA00344BO PAGE 1](https://openairdocs.org/stc/SA00344BO%20PAGE%201): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights. Whelen Aerospace Technologies
- [STC SA615EA](https://openairdocs.org/stc/SA615EA): Installation of a Whelen Anti-Collision Strobe Light System as replacement for originally installed anti-collision lights. Whelen Aerospace Technologies
- [STC SA04165NY](https://openairdocs.org/stc/SA04165NY): Installation of Latitude Technologies Skynode S200 Satcom system must be performed. Latitude Technologies Corporation
- [STC SA02153LA-D PAGE 1](https://openairdocs.org/stc/SA02153LA-D%20PAGE%201): Installation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) System. Garmin International Inc
- [STC SA00024NY](https://openairdocs.org/stc/SA00024NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K007 on single or multi-engine fixed wing light aircraft incorporating Lycoming reciprocating engines of 450 horsepower or less. Airwolf Filter Corporation
- [STC SA01933LA-D](https://openairdocs.org/stc/SA01933LA-D): Installation of Garmin Model 400W / 500W Series GPS-WAAS Navigation System. Garmin International Inc
- [STC SA02212AK](https://openairdocs.org/stc/SA02212AK): Replacement of existing landing and/or taxi light reflector and bulbs with high intensity discharge (HID) lighting systems. Seaplanes North LLC
- [STC SA2586NM](https://openairdocs.org/stc/SA2586NM): Installation of J.P. Instruments temperature monitoring systems. J P Instruments
- [STC SA00382BO](https://openairdocs.org/stc/SA00382BO): Installation of Globalstar Antenna and Cradle provisions to support a Globalstar GPS-1700 in non-composite airplanes. Avidyne Corporation
- [STC SA02428SE](https://openairdocs.org/stc/SA02428SE): Installation of an Air Stream Switch for an electric time recording device on non-pressurized aircraft. Henry F Rogers/David E Polley
- [STC SA00343BO](https://openairdocs.org/stc/SA00343BO): Installation of a single configuration or a dual configuration Avidyne Corporation Integrated Flight Display, Model IFD540 loaded with Release 10.0 software (or later FAA approved release). Avidyne Corporation
- [STC SA00352BO PAGE 1](https://openairdocs.org/stc/SA00352BO%20PAGE%201): Installation of an Avidyne Corporation Mode A/C/S Transponder with ADS-B Out capability, Model AXP340 loaded with Version 3.13 software (or later FAA approved version),. Avidyne Corporation
- [STC SA00780SE](https://openairdocs.org/stc/SA00780SE): Installation of the True Lock Safety Retention Axle Lock Nut System. True Lock LLC
- [STC SA02119SE PAGE 1](https://openairdocs.org/stc/SA02119SE%20PAGE%201): Installation of Garmin GDL 88 ADS-B UAT Transceiver System. Garmin International Inc
- [STC SA00478CH](https://openairdocs.org/stc/SA00478CH): Installation of Cooper Superflite 102 Fabric. Aviation Products Systems Inc
- [STC SA01229SE PAGE 1](https://openairdocs.org/stc/SA01229SE%20PAGE%201): Installation of GNS 480 (CNX80) GPS WAAS Navigator with integrated VHF Navigation and Communication radios. Garmin International Inc
- [STC SA02442AK PAGE 1](https://openairdocs.org/stc/SA02442AK%20PAGE%201): Approval of the L-3 Communications NGT 2000/2500 ADS-B system. ADS-B Technologies, LLC
- [STC SA4305WE](https://openairdocs.org/stc/SA4305WE): Installation of GAR-AERO wheel adapters and tundra type tires on the main landing gear. Seaplanes North LLC
- [STC SA01933LA-D PAGE 1](https://openairdocs.org/stc/SA01933LA-D%20PAGE%201): Installation of Garmin Model 400W / 500W Series GPS-WAAS Navigation System. Garmin International Inc

All 126: https://openairdocs.org/model/helio-h-391b/stcs.md

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