Aerostar RX 8 N7059U

Summary

On 8 June 2013 at about 13:15 local time, a Aerostar RX 8 registered N7059U, operated by Providence David C, was involved in an accident near Arvada, Colorado, United States. 3 people were on board and one was seriously injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

8 June 2013 at 13:15

Classification

Accident

Location

Arvada, Colorado, United States

Coordinates

39.8675, -105.2397

Aircraft

Aerostar RX 8

Registration

N7059U

Category

Balloon

Operator

Providence David C

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Gunbarrel → Arvada

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

CEN13LA347

1 person was seriously injured.

The balloon's encounter with unforecast strong gusting wind, which resulted in a high-wind landing. Contributing to the accident was the National Weather Service's misjudgment of the timing and underestimation of the magnitude of the frontal boundary moving across the region.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

The pilot reported that, before the flight, he checked the weather forecast and received weather information from several sources. He and the other balloon pilots flying that day compared the weather information and agreed that the forecast weather provided suitable conditions for a safe flight that morning. However, because the wind conditions on the ground were light and erratic, they delayed taking off. The pilots continued monitoring the current and forecast weather using their wireless devices. The wind eventually calmed, and, after putting up additional pibals, they determined that the wind at altitude would take the balloons to the east-southeast and then south at 3 to 5 miles per hour. At takeoff, the wind was calm. The balloon traveled to the east-southeast and then, about 1,000 to 1,200 feet above ground level, the balloon turned toward the south. The first 30 to 40 minutes of flight were smooth, and the balloon traveled slowly to the southeast. About 40 minutes into the flight, at an altitude of 6,200 feet mean sea level, a wind gust buffeted the balloon. The pilot reported the condition to the other pilots who were flying in the area, and they responded that they were experiencing similar conditions at various altitudes. As he looked at the other balloons, the pilot noticed significant distortions in the envelopes indicative of high winds. The pilot briefed his passengers on a high-wind landing and landed in a cleared construction area. As the balloon touched down, he pulled the deflation lines, and the balloon deflated in seconds; however, the envelope concaved, and the balloon was dragged for several hundred feet until it came to rest on the side of a highway. A review of meteorological data available at the time of the preflight briefing indicated, in part, that wind from the west existed at 10 knots or less before takeoff. The National Weather Service (NWS) terminal area forecast expected easterly wind shifting to the northwest at 13 knots during the anticipated flight with wind from the north gusting to 23 knots after 1000 mountain daylight time. The NWS area forecast did not expect any high winds across Colorado. The NWS Aviation Forecast Center had no advisories current for low-level turbulence or high winds over Colorado surrounding the anticipated flight. However, shortly after takeoff, a sudden increase in windspeed occurred across the region with wind gusts from 20 to 38 knots. The NWS misjudged the timing and underestimated the magnitude of the frontal boundary moving across the region. It is likely that, if the pilot had known about the gusting wind at the time of takeoff, he may not have chosen to fly that day.

Quoted verbatim from the NTSB record.