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ASN Wikibase Occurrence # 202106
Last updated: 16 July 2020
This record is based on the official accident investigation report. It has been locked for editing.

Date:01-APR-1999
Time:17:00
Type:Silhouette image of generic RV6 model; specific model in this crash may look slightly different
Van's RV-6A
Owner/operator:Private
Registration: N80287
C/n / msn: 22902
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Payson, UT -   United States of America
Phase: En route
Nature:Private
Departure airport:Spanish Fork, UT (U77)
Destination airport:
Investigating agency: 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.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001205X00452&key=1


Revision history:

Date/timeContributorUpdates
26-Nov-2017 12:37 ASN Update Bot Added