Casualties unknown

VFR Cross-Country Flight Strikes Terrain After Encountering IMC (N5054F)

Yorkville, IL, US

On July 17, 1999, a Piper PA-28-181 (registration N5054F) was involved in an aviation accident near Yorkville, IL. Investigators recorded the probable cause as: the pilot continuing into known adverse weather conditions, attempting low altitude flight, and not maintaining terrain clearance. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 4 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-07-04Data APIEditorial standards

A VFR cross-country flight struck terrain after encountering IMC and precipitation. Witnesses observed the aircraft at 50-60 ft AGL before a turn. Multiple briefings warned of deteriorating weather.

Flight Details

The aircraft was conducting a cross-country flight under visual flight rules (VFR). During the flight, it entered instrument meteorological conditions (IMC) and encountered precipitation. Witnesses reported observing the aircraft flying northbound at an altitude of approximately 50 to 60 feet above ground level (AGL) before it initiated a turn. Shortly thereafter, the aircraft collided with terrain.

Weather Conditions

The National Oceanic and Atmospheric Administration (NOAA) National Weather Service provided weather-radar plots that showed an area of precipitation moving through the accident location both before and after the reported time of the accident. Radar track data from the Federal Aviation Administration (FAA) was overlaid on the NOAA plots, indicating that the accident aircraft encountered convective activity prior to and around the accident time. A weather observation station located 10.9 nautical miles from the accident site on a 215-degree magnetic heading reported visibility of 1 3/4 statute miles and cloud conditions of 900 scattered, 1,800 broken, and 2,500 overcast.

Pilot Briefings

Prior to departure, the pilot received three weather briefings from the FAA Automated Flight Service Station (AFSS). During two of these briefings, the AFSS advised that VFR flight was not recommended. In the final briefing, the pilot was informed of deteriorating weather conditions along the proposed route of flight. While en route, the pilot obtained two additional weather briefings from FAA AFSS facilities, and during each, the pilot was advised of the continued deterioration of weather conditions along the planned route.

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Frequently asked questions

What happened in the 17 Jul 1999 Piper PA-28-181 accident near Yorkville, IL?

A VFR cross-country flight struck terrain after encountering IMC and precipitation. Witnesses observed the aircraft at 50-60 ft AGL before a turn. Multiple briefings warned of deteriorating weather.

What aircraft was involved and where did it happen?

The accident on 17 Jul 1999 involved a Piper PA-28-181, registration N5054F, at Yorkville, IL.

What was the probable cause of the accident?

the pilot continuing into known adverse weather conditions, attempting low altitude flight, and not maintaining terrain clearance. Factors to the accident were the thunderstorm and the improper weather evaluation by the pilot following pre-departure and in-flight weather briefings.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X19167. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.