DEN99LA062 · Sly RV-6A
Sly RV-6A · Accident: total loss of engine power (non-mechanical) en route
From U77 · Spanish Fork, UT to an unrecorded destination
Event
- NTSB case
- DEN99LA062
- 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
Sly RV-6A
- Aircraft type
- SLY RV-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
- N80287
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From U77 · Spanish Fork, UTTo 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
- 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
- Total loss of engine power (non-mechanical)
- 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
- Carburetor heat, shroud › Inadequate
- Fuel system, carburetor › Ice
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
After being airborne for 15 minutes, the aircraft's engine began to lose power. The pilot initiated an emergency landing along a county road but switched to another road to avoid power lines. Upon touchdown, the aircraft departed the side of the road and struck a fence post. The engine was examined and test run, and no discrepancies were observed. The pilot stated that 'other pilots at the scene agreed the conditions could cause carburetor icing.' According to the FAA inspector present at the accident scene, 'the conditions were a classic setup for carburetor icing.' The Van's Aircraft construction and operating manual states that one method of building the carburetor heat system is to 'run a 2-inch air hose from a heat muff and position it to feed into the alternative air inlet of the carb[uretor] air box,' which is the method by which the pilot constructed the airplane. According to the inspector, the 2-inch hose is not large enough to adequately supply enough heat to the carburetor to sufficiently melt the ice. The aircraft was issued an airworthiness certificate by the FAA on August 24, 1995.
Probable cause
The development of carburetor ice resulting in a loss of engine power, and the inadequate carburetor heat shroud. Factors were the carburetor icing weather conditions, the kit manufacturer's inadequate carburetor heat shroud design, the FAA's inadequate certification of the aircraft, the snow covered, unsuitable terrain on which to perform a forced landing, and the fence post.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DEN99LA062
- Event ID
- 20001205X00452
- Case number
- DEN99LA062
- 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: local date, investigation status. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 1999-04-02.
- API snapshot SHA-256: 73c6dbaf21d2b04a244c09b3c12b9e97722cd524730a2230c2476b4acb665899; retrieved 2026-09-22T15:33:59.554Z.