DEN99LA048 · Piper PA-28-235
Piper PA-28-235 and Diamond Aircraft Industries DA 20-A1 · Accident: on ground/water collision with object during takeoff
Event
- NTSB case
- DEN99LA048
- 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
Aircraft 1 · Piper PA-28-235
- Aircraft type
- Piper PA-28
- 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
- N4312A
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Provo Municipal Airport (PVU)To Richfield Municipal Airport (RIF), Richfield, UT
- 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
- On ground/water collision with object
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Destroyed
Aircraft 2 · Diamond Aircraft Industries DA 20-A1
- Aircraft type
- Diamond DA-20
- 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
- N189DA
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Provo Municipal Airport (PVU)To not recorded
- 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
- On ground/water collision with object
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Destroyed
Cause areas
- Pilot in command › Judgment, poor
- Pilot in command › Procedures/directives, not followed
- Pilot in command › Visual lookout, not maintained
- Pilot in command › Wrong runway, intentional
- Pilot of other aircraft › Judgment, poor
- Pilot of other aircraft › Procedures/directives, not followed
- Pilot of other aircraft › Visual lookout, not maintained
- Pilot of other aircraft › Wrong runway, intentional
Approximate · Estimated position: the centre of Provo, UT, the place the record names. Not the accident site.
NTSB narrative
N189DA, a Diamond-DA 20-A1 was one of several airplanes in the traffic pattern for runway 31, which was the active runway. The airplane landed and was on landing rollout when it was struck by N4312A, a Piper PA-28-235 that was on takeoff roll on runway 18. The collision occurred at the intersection of runways 31 and 18. The pilot of the piper said he saw two airplanes in the traffic pattern, and heard both pilots advise of their positions and intentions. The pilot of the piper announced that he would be taxiing onto runway 18 for departure because he had 'plenty of time to depart before either of the two aircraft were in position to land.' He did not see the diamond, which was ahead of the other two airplanes. Two other pilots reported having near collisions with the piper earlier that day, and one pilot reported having a near collision with the piper two months earlier.
Probable cause
The pilot exercising poor judgment by ignoring proper procedures/directives, his intentional selection of the wrong runway for takeoff, and his failure to maintain an adequate visual lookout. Factors were his ostentatious display, the other airplane moving on the ground, and the other pilot's failure to maintain an adequate visual lookout.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DEN99LA048
- Event ID
- 20001205X00306
- Case number
- DEN99LA048
- 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: adbfe3c02f40093797c9f3d006f1504bf81ad0c77947b138d1882ab3a9d485dc; retrieved 2026-09-21T11:11:23.441Z.