How many Honda HA-420s are registered in the US?

240, in the FAA aircraft registry.

When was the Honda HA-420 built?

From about 2015 to 2026. Half of those registered today were built by 2019.

What engine does the Honda HA-420 have?

Most have the GE HONDA HF-120 (87% of those registered).

What are common problems with the Honda HA-420?

In 45 Service Difficulty Reports filed with the FAA since 2016, the systems reported most were landing gear brake system, landing gear system, pressure regulator/outflow valve, and the part most often reported was a failed compensator.

How many accidents has the Honda HA-420 had?

12 in the NTSB's database since 2018, 0 of them fatal. The most common defining event was runway excursion. These are counts, not rates: how many hours the fleet flew is not published.

How many Airworthiness Directives does the Honda HA-420 have?

7 current ADs name the HA-420 airframe, 1 of them with a repeat action. Whether each applies to one aircraft depends on its serial number and installed equipment.

Ownership guide

Honda HA-420

240 registered in the US, built from about 2015 to 2026, 8 seats, most with the GE HONDA HF-120. Its Airworthiness Directives, its engines', and what to check before buying one.

The fleet

Registered in the US: 240
Built: 2015 to 2026
Half built by: 2019
Seats: 8
Engine type: Turbofan
Most common engine: GE HONDA HF-120

Engines installed

GE HONDA HF-120209 aircraft (87%)

From the FAA aircraft registry, rebuilt daily. Years are those recorded on each registration.

Airworthiness Directives

7 current ADs name the HA-420 airframe, 1 with a repeat action; 5 more were superseded.

The ones that come back

ADs with a repeat action: an inspection or replacement at an interval, for as long as the AD applies. These are the airworthiness costs an owner keeps paying.

2026-06-71Requires replacing the flap control pushrod assemblies with improved design pushrod assemblies for all airplanes affected by AD 2021-22-12, as well as for other airplanes not affected by AD 2021-22-12Trailing edge flap actuator · AirplaneSupersedes 2021-22-12Repeat actionApr 3, 2026

Every AD for the Honda HA-420

What gets reported

45 Service Difficulty Reports since 2016: a mechanic or operator files one when a part fails or is found defective.

Systems reported most

Landing Gear Brake System22
Landing Gear System4
Pressure Regulator/Outflow Valve2
Elevator Tab Control System2
Engine (Turbine/Turboprop)1
Wheel/Ski/Float1

Parts reported most

Compensator, failed23
Outflow valve, failed2
Cover, separated1
Wheel, loose1
Pdu, unknown1
Unknown, unknown1

The latest reports

2026-08-02 · Engine (Turbine/Turboprop) · Cover, separated
Hondajet n909bp, 42000099, taxied out on sunday, august 2, and the line service personnel found a 7" x 2" curved stainless-steel plate/piece with p/n - 4jqt4-13121-q0a-0100 laying on the ground where the aircraft had parked. a secuity video showed an object being ejected from the exhaust path of the right engine. hondajet tech support confirmed that this was one of the "gg case bolt covers", one o
2026-02-13 · Pressure Regulator/Outflow Valve · Outflow valve, failed
Cabi alt high cas/depressurization at fl290. r&r outflow valve.
2026-02-13 · Pressure Regulator/Outflow Valve · Outflow valve, failed
Cabi alt high cas/depressurization at fl290. executed emergency procedures and diverted to fxe. /r & r outflow valve.
2023-10-12 · Elevator Tab Control System · Actuator, defective
After takeoff crew observed pitch trim fault cas message and experienced increased back pressure on the yoke during climb out. crew performed qrh procedures, switching to stby trim and executed divert to nearby airport. aircraft landed without incident.

From the FAA's Service Difficulty Reporting System, refreshed monthly. Counts of what was reported, not failure rates: most of general aviation reports voluntarily, and a busy training fleet reports more than a private one.

Accident record

12 accidents since 2018, 0 fatal, 0 aircraft destroyed.

What happened

Runway excursion5
Loss of control on ground3
Ground collision1
Collision with terrain or object (non-CFIT)1
Part(s) separation from AC1
Landing gear not configured1

Phase of flight

Landing10
Taxi1
Takeoff1

The latest

Date	Where	What happened	Injuries	NTSB number
2026-01-16	Amarillo, TX	Taxi: Ground collision	None	CEN26LA096
2025-04-07	North bend, OR	Landing: Runway excursion	Serious	WPR25LA124
2025-03-04	San antonio, TX	Landing: Runway excursion	None	CEN25LA109
2024-01-28	Orlando, FL	Landing: Loss of control on ground	None	ERA24LA100
2023-05-18	Summerville, SC	Landing: Runway excursion	None	ERA23FA235
2023-03-06	Buena vista, CO	Landing: Loss of control on ground	None	CEN23LA134

From the NTSB's aviation accident database, refreshed monthly; accidents only, homebuilts left out. Counts, not rates: nobody publishes how many hours each model flies, and a training fleet flies far more than a private one. Look up any case by its number in the NTSB's CAROL.

What it costs to run

Per hour flown

Hours flown a yearhr/yrFuel burngal/hrTypical cruise; your POH and how you fly decide it.Fuel price$/galEngine overhaul$A quote from an engine shop.Hours to overhaulhrThe engine maker's published time between overhauls.Maintenance reserve$/hrEverything else that wears: tires, brakes, avionics, the unexpected.

Per year, flown or not

Insurance$/yrHangar or tiedown$/yrAnnual inspection$/yrLoan payments$/yrEverything else$/yrSubscriptions, database updates, the property tax some states charge.

Fuel: $0/hr
Engine reserve: $0/hr
A year: $0
All in, per hour: $0/hr

Everything else is yours to fill in: insurance, hangar and overhaul prices vary too much by pilot, airport and shop for a default to mean anything. Nothing you type leaves this page.

Before you buy one

Run its N-number through the AD check: every AD that names its airframe and engine, as a checklist to take to the logbooks.
For each repeat-action AD (1 on the airframe), find the last compliance in the logbooks and when the next one is due.
Compare the engine's time since overhaul with its maker's published overhaul time, and look for the reason behind any long gap in flying.
Ask the mechanic doing the pre-buy to look hard at the landing gear brake system and for failed compensators: they are what gets reported most on this model.
Check the registration, the airworthiness certificate and the date of the last annual inspection.
Work out the sales or use tax your state will charge with the aircraft tax calculator.

Questions

How many Honda HA-420s are registered in the US?: 240, in the FAA aircraft registry.
When was the Honda HA-420 built?: From about 2015 to 2026. Half of those registered today were built by 2019.
What engine does the Honda HA-420 have?: Most have the GE HONDA HF-120 (87% of those registered).
What are common problems with the Honda HA-420?: In 45 Service Difficulty Reports filed with the FAA since 2016, the systems reported most were landing gear brake system, landing gear system, pressure regulator/outflow valve, and the part most often reported was a failed compensator.
How many accidents has the Honda HA-420 had?: 12 in the NTSB's database since 2018, 0 of them fatal. The most common defining event was runway excursion. These are counts, not rates: how many hours the fleet flew is not published.
How many Airworthiness Directives does the Honda HA-420 have?: 7 current ADs name the HA-420 airframe, 1 of them with a repeat action. Whether each applies to one aircraft depends on its serial number and installed equipment.

Figures from the FAA aircraft registry and the FAA's Airworthiness Directives, rebuilt daily. An AD listed for a model is one to read; whether it applies to one aircraft depends on its serial number, equipment and records.