LAX91LA144 · Helio H391B
Helio H391B · Accident: loss of control on ground/water during takeoff
From an unrecorded airport to Phoenix Sky Harbor International Airport (PHX)
Event
- NTSB case
- LAX91LA144
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Helio H391B
- Aircraft type
- Helio H391
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N289LM
- Operator
- Dan Stover
- Onboard fatalities
- Unknown
- Route
- From not recordedTo Phoenix Sky Harbor International Airport (PHX), Phoenix, AZ
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Takeoff · roll/run
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Loss of control on ground/water
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Pilot in command › Directional control, not maintained
- Pilot in command › Flight controls, improper use of
Approximate · Estimated position: the centre of Prescott, AZ, the place the record names. Not the accident site.
NTSB narrative
THE CERTIFICATED COMMERCIAL PILOT/FLIGHT INSTRUCTOR WAS DEPARTING ON A PROPOSED CROSS COUNTRY FLIGHT. THE SURFACE WINDS WERE A DIRECT CROSSWIND FROM THE LEFT. WHEN THE TAIL LIFTED ON THE CONVENTIONAL GEAR AIRPLANE THE AIRPLANE VEERED TO THE LEFT. THE PILOT FAILED TO MAINTAIN DIRECTIONAL CONTROL AND THE AIRPLANE GROUND LOOPED WHEN IT EXITED THE RUNWAY AND STRUCK THE SOFT MUD ADJACENT TO THE RUNWAY. THE PILOT REPORTED THAT THE LEFT BRAKE WAS BEING APPLIED BY A MECHANICAL FAILURE. EXAMINATION OF THE BRAKE SYSTEM DISCLOSED NO EVIDENCE OF ANY PREEXISTING MALFUNCTIONS OR FAILURES. THE PILOT HAD ACCRUED ONLY 19 HOURS IN THE ACCIDENT AIRPLANE MAKE AND MODEL.
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 THE AIRPLANE.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record LAX91LA144
- Event ID
- 20001212X16639
- Case number
- LAX91LA144
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 41728e1749f05ab26800c8398fd9456ade6859108f335c2cff3764eca192e730; retrieved 2026-09-23T04:32:53.445Z.