N500FV

HISTORY OF FLIGHT

On August 11, 2010, about 0855 pacific daylight time, a Rockwell Aero Commander 500-B, N500FV, impacted the terrain about 80 miles south of Burns, Oregon. The private pilot and his passenger were killed, and the airplane sustained substantial damage. The 14 Code of Federal Regulations Part 91 visual flight rules (VFR) cross-country flight, which departed Redding Municipal Airport, Redding California, about 0725, was en route to Butte, Montana. The accident took place in an area where visual meteorological conditions were present from the surface up to about 4,000 feet above the terrain, but where overcast clouds, occasional thunderstorms, lightning, and rain were reported by individuals on the ground both before and after the accident. No flight plan had been filed, and there was no report of a transmission from an Emergency Locator Transmitter (ELT).

At 2014 on the day before the accident, the pilot logged onto the Direct User Access Terminal System (DUATS) to obtain a computer generated text weather briefing. He logged onto DUATS again at 0625 on the morning of the accident for another text weather briefing. Around that same time, he had Redding Jet Center top off the airplane's fuel system with 100LL (low lead) aviation fuel, and also had the airplane's supplemental oxygen system filled. At 0701 he contacted Lockheed Martin Flight Service for a telephonic weather briefing, which lasted about ten minutes. He then departed Redding for Butte just prior to the time the control tower began operation at 0730. At 0753 he contacted Seattle Air Route Traffic Control Center (ARTCC), and advised the controller that he would like "flight following," that he was 36 miles south of Klamath VOR at 11,500 feet, and that he was en route to Bert Mooney Airport (Butte, Montana). The controller assigned the pilot a transponder code, and soon thereafter provided the Klamath Falls altimeter setting and said that he had radar contact 35 miles south of Klamath Falls. Approximately 32 minutes later the controller gave the pilot an updated altimeter setting, and about 2 minutes after that, the pilot advised the controller that he was climbing to 13,500 feet in order to "…get over some clouds." About 13 minutes later, the controller gave the pilot another updated altimeter setting, and after acknowledging the setting, the pilot stated that he was going to "…go up to 15,500 feet." The pilot did not give a reason for that climb.

At 0843 the controller contacted the pilot and advised him that Salt Lake Center (the next ARTCC that the flight would be handed off to along the route) was not picking the airplane up on radar, and he therefore was going to have to terminate flight following for a little while. The controller then terminated flight following, advised the pilot to set his transponder to the 1200 VFR code, and told him to contact Salt Lake Center in about 30 miles on frequency 128.05. He advised the pilot that Salt Lake Center may be able to pick him up on radar by then. The controller then advised the pilot that his radar screen indicated that there was some moderate to heavy precipitation in the pilot's 12 o'clock position about 50 miles ahead. The controller then stated that the precipitation was more like 60 miles ahead, and that it was a "… weather band that extends about 60 miles." The pilot acknowledged the controllers transmission, which was the last known transmission from the pilot prior to the accident. From the time the pilot began flight following until the airplane was no longer seen on radar the airplane was on what appeared to be a direct route from Redding to Butte.

Between 0845 and 0850 individuals camping or working around the South Steens Campground, which is located about one mile east of where the airplane impacted the terrain, began to hear the sound of the airplane's engines. The initial sound was described as a normal drown, but soon thereafter the sounds began to change. One witness, who was a pilot with 3,500 hours of flying time, described the sounds as indicating, "… full power settings, frequent attitude changes, and high angles of attack, typical of what you would hear during an aerobatic demonstration at an airshow." During this period of time, which he estimated as lasting between 30 to 40 seconds, the airplane was higher than the bottom of the overcast cloud layer, and therefore could not be seen.

The airplane then broke out of the bottom of the clouds, and was seen doing between two and four rolls, which were described by the witnesses as either barrel rolls or snap rolls. It then descended nearly straight down into the ground, while still continuing to roll. According to the pilot-rated witness, it appeared that during the initial rolling sequence and during the steep descent, an outboard portion of one of the wings was missing. The airplane hit the ground at what the witnesses described as a very high rate of speed, and then somewhere between 20 and 40 seconds later one or two pieces of the airplane's structure came floating down out of the sky.

PERSONNEL INFLORMATION

The pilot was a 58 year old male, who possessed an FAA Private Pilot's Certificate, with both single-engine and multi-engine land ratings. He was not instrument rated. His last airman's medical, a Third Class, was issued on July 8, 2010, with the limitation, "Must wear corrective lenses." A review of his historical airman's medical applications revealed no current or previous diagnosis of the conditions listed in section 18 (Medical History) of the application. The pilot stated on the medical application that his total civilian pilot time was 1,350 hours, and that he had flown 25 hours in the previous six months. His last flight review, which was performed in the accident airplane, was completed on May 14, 2009.

AIRCRAFT INFORMATION

The airplane was a 1962 Rockwell Aero Commander 500B, with two Lycoming IO-540-E1A5 engines, and two Hartzell HC-A3VK-2A propellers. Its last annual inspection was signed off on July 12, 2010, at which time the log book indicated an airframe total time of 5,359.6 hours. Its last recorded Aviation Engine Oil Sample was completed on May 14, 2009, at which time all values were reported as appearing normal. The last airframe log book entry was the replacement of the left engine alternator on August 2, 2010, at which time the airframe total time was 5,371.3 hours.

METEOROLOGICAL INFORMATION

When the pilot called Lockheed Martin Flight Service on the morning of the flight, he stated that he wanted a weather briefing for a VFR flight at 9,500 feet from Redding, California, to Butte, Montana. He was then advised by the briefer that a direct route between Redding and Butte would take him through an area where there were broken clouds at 10,000 feet, with tops to 22,000 feet, along with rain showers, and thunderstorms were expected. In addition this route would take him through an area for which an Airmen's Meteorological Information (AIRMET) had been issued. That AIRMET indicated there would be a wide spread area of mountain obscuration from clouds, and that VFR flight was not recommended through the mountains within the area of the AIRMET. This information was consistent with the text data that made up the pilot's previous DUATS briefings. The briefer further advised him that satellite images showed that the clouds were "pretty solid" along that route. The briefer also told him that although the current conditions in Redding were clear skies and 10 miles visibility, that the current conditions in southeast Oregon and southwest Idaho was broken ceilings of 9,000 to 10,000 feet mean sea level (MSL), with forecast cloud tops at flight level 220. He further commented that he was, "… showing some pretty good showers over around Baker and just west of Boise."

The pilot indicated that he was aware of the area of clouds and precipitation, and stated that he did not want to get trapped on top of an extensive area of cloud cover. The briefer then suggested that instead of a direct route that the pilot take a route toward the Idaho Falls/Pocatello area, and then head north from there because, "…it would take you east of all the precipitation and keep the last half of your route at least out of most of the cloud cover. He advised the pilot that around the Twin Falls/Burley/Pocatello area that it would be "all clear" below 12,000 feet, and that the worst weather forecast for the Idaho Falls/Rexburg area was 15,000 scattered. The pilot responded to that suggestion by asking, "Okay, then drop down toward Pocatello and then up?" To which the briefer responded, "Yeah, it would be the best way, yeah." To which the pilot's responded, "Yeah, alright." The briefer then covered the winds aloft and checked the Notice to Airmen (NOTAMs) before ending the briefing.

According to witnesses who had been in the area of the South Steens Campground the night before the accident, the overnight weather consisted of frequent rain showers with varying degrees of intensity, with a total rainfall estimated to be about one-half inch based on accumulations. All witnesses reported that after sunrise the sky was almost completely covered with an overcast layer of clouds that was estimated to be 3,000 to 4,000 feet above ground level (AGL). One pilot-rated witness reported a few breaks in the overcast, through which he could see cumulonimbus cloud buildups that he estimated reached an altitude of about 20,000 feet. Although none of the witnesses reported rain showers, lightning or thunder at the time of the accident, one stated that there had been several rain showers earlier in the day, and that he had seen lightning and heard thunder about two hours prior to the crash. Another witness reported that at the time of the accident there was one "dark cumulonimbus cloud" south of where the airplane hit, and that he heard thunder in the direction of that cloud about one hour after the accident. A couple of the wit...