Monarch Enterprises de Havilland DHC-6-300 accident
de Havilland DHC-6-300 · Accident: windshear or thunderstorm en route
From Grand Canyon Bar Ten Airstrip (1Z1) to BVD · Boulder City, NV
Narrative check · The NTSB narrative appears to contradict this record's date and departure or destination. Values are shown as recorded, not corrected; compare with the narrative.
Event
- NTSB case
- WPR25LA152
- 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
- Ongoing
- Event fatalities
- Unknown
- Ground fatalities
- Unknown
- 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
- Charter & commuter
- 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
de Havilland DHC-6-300
- Aircraft type
- de Havilland DHC-6
- 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
- N142SA
- Operator
- Monarch Enterprises
- Onboard fatalities
- Unknown
- Route Possible conflict
- From Grand Canyon Bar Ten Airstrip (1Z1), Whitmore, AZTo BVD · Boulder City, NV
- Aircraft age
- About 56 years (built 1969)
- 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 135: Air Taxi & Commuter
- 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
- En route · cruise
- Defining eventThe 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
- Windshear or thunderstorm
- 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
No findings designated as a cause are recorded in the NTSB data yet.
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
On May 6, 2023, about 1450 Pacific daylight time, a DeHavilland DHC-6-300, N142SA, was substantially damaged when it was involved in an accident near Boulder City, Nevada. The 2 pilots and 11 passengers were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 135 non-scheduled air taxi flight.
The pilot reported that while operating in visual flight rules (VFR) weather conditions from Grand Canyon Bar Ten Airstrip (1Z1) Whitmore, Arizona to Boulder City Municipal Airport (BVU). While enroute to BVU, they observed adverse weather along their route of flight and diverted south with the intention of landing at Henderson Executive Airport (HND), Henderson, Nevada if the weather worsened. The pilot stated that the weather conditions improved east of BVU and they turned towards the airport. About 7 miles southeast of BVU while maneuvering for weather, the airplane encountered brief light turbulence and hail that lasted about 5 to 6 seconds. The pilot stated that following the encounter, they landed at BVU uneventfully.
A convective significant Meteorological Information (SIGMET) 11W was valid on the day of the accident from 1355 to 1459, 20 miles southeast of Las Vegas, Nevada. An isolated thunderstorm was moving from 300° at 15 knots with the tops of the clouds ay about 33,000 ft. The valid time of the report ended at 1555.
Post flight examination of the airplane revealed substantial damage to both wings, , vertical stabilizer, and horizontal stabilizers.
Verbatim NTSB factual narrative from the NTSB dataset
Sources
NTSB record WPR25LA152
- Event ID
- 20250507200129
- Case number
- WPR25LA152
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
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, coordinates. 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: 5cbda0ec2450faab077a9ff8e9bf9d9fd61bd825722c1ab3f020074e8ce99d95; retrieved 2026-09-16T19:52:29.010Z.