DEN88FA071 · Cessna 172M
Cessna 172M · Accident: in flight encounter with weather en route
From Billings Logan International Airport (BIL) to Joslin Field Magic Valley Regional Airport (TWF)
Event
- NTSB case
- DEN88FA071
- 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
- 3 · 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
- Instrument Meteorological Cond
Cessna 172M
- Aircraft type
- Cessna 172
- 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
- N20484
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Billings Logan International Airport (BIL), Billings, MTTo Joslin Field Magic Valley Regional Airport (TWF), Twin Falls, ID
- 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
- En route · cruise
- 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
- In flight encounter with weather
- Also codedOther events the NTSB coded in the sequence, such as a wire strike after a loss of power. Flight Findings uses them for its kinds of event. Glossary
- Visual flight rules (VFR) flight into instrument meteorological conditions (IMC)
- 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 › Flight into known adverse weather, initiated
- Pilot in command › VFR flight into imc, attempted
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE PLT AND TWO PAX WERE RETURNING TO TWIN FALLS, ID FROM BILLINGS, MT. THE PLT REC TWO WX BRIEFINGS PRIOR TO DEP. THE WX FORECAST INDICATED LOW CLOUDS, SNOW, TURB AND ICING COND ALONG THE INTENDED ROUTE OF FLIGHT. THE ROUTE OF FLIGHT REQUIRED THE PLT TO TRAVERSE HIGH MTN TERRAIN. THE PLT RADIOED HE WAS ENCOUNTERING CLOUDS NEAR THE MTNS. THE ACC SITE ELEV WAS 10,000 FT. THERE WAS NO EVIDENCE OF A MECH MALFUNCTION OR FAILURE OF THE ACFT STRUCTURE, FLT CONTROLS, ENG OR PROP. THE FSS HAD FORECAST THE MOUNTAINS TO BE OBSCURED BY CLOUDS AND THE WX TO INCLUDE SNOW AND TURBULENCE.
Verbatim NTSB analysis from the NTSB dataset
Sources
NTSB record DEN88FA071
- Event ID
- 20001213X25047
- Case number
- DEN88FA071
- 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: 1d66f5d75f3225f42bacd7981e3aaf5cd4637d47684037996ae92c0db0d99ab8; retrieved 2026-09-21T03:49:16.318Z.