N1842F

HISTORY OF FLIGHTOn May 21, 2015, about 0857 Pacific daylight time, a Cessna 210F, N1842F, was destroyed when it impacted terrain while maneuvering near Pleasanton, California. The instrument rated private pilot, the sole occupant, was fatally injured. The airplane was registered to, and operated by, the pilot as a 14 Code of Federal Regulations (CFR) Part 91 personal flight. Instrument meteorological conditions prevailed within the area for the personal cross-country flight, and no flight plan was filed. The flight originated from Buchanan Field Airport (CCR), Concord, California, at 0848, with an intended destination of the Reid-Hillview Airport (RHV), San Jose, California.

The pilot obtained an official weather briefing from Direct Use Access Terminal (DUAT) at 0802. When the airplane failed to arrive at KRHV, a friend of the pilot contacted the Federal Aviation Administration (FAA). The FAA subsequently issued an Alert Notification (ALNOT). The Civil Air Patrol (CAP) and local law enforcement commenced search and rescue operations throughout the area. The wreckage was located by CAP on the morning of May 22, 2015. PERSONNEL INFORMATIONThe pilot, age 66, held a private pilot certificate for airplane single engine land, and he was instrument rated. A second-class airman medical certificate was issued on April 13, 2014, with the following limitation: must wear corrective lenses. A review of the pilot's logbook revealed that he had accumulated about 1,232.2 hours of total flight time as of May 13, 2015. AIRCRAFT INFORMATIONThe six-seat, single-engine, high-wing, retractable landing gear airplane, serial number 21058742, was manufactured in 1966. It was powered by a Continental Motors IO-520-A engine, serial number 111396-6-A, rated at 285 horse power. The airplane was also equipped with a McCauley three bladed constant speed propeller, model D3A34C402-C. A review of maintenance records showed that the most recent annual inspection was completed May 17, 2015, at a total aircraft time of 3,811.6 hours, and tachometer time of 721.3 hours. METEOROLOGICAL INFORMATIONA NTSB staff meteorologist prepared a factual report for the area and timeframe surrounding the accident.

The National Weather Service (NWS) Surface Analysis Chart for 0800 depicted a surface trough to the east of the accident site in central Nevada, and oriented from north to south into western Arizona with a surface low pressure center at 1005-hectopascals (hPa). The station models around the accident site and along the California coast depicted air temperatures in the low to mid 50's Fahrenheit (F), with temperature-dew point spreads of 2 degrees F or less, a west-to-northwest wind between 5 and 10 knots, cloudy skies, and areas of fog. The station models east of the accident site and in the central valley of California coast depicted air temperatures in the mid to upper 50's Fahrenheit (F), with temperature-dew point spreads of 8 degrees F or more, variable winds between 5 and 15 knots, and partly cloudy skies. The accident site was located in an area where the marine air was moving onshore and into the terrain helping to produce clouds and some precipitation. The area is favored for widespread low cloud cover.

An Automated Surface Observing System (ASOS) located 2 miles west of Hayward Executive Airport (HWD), Hayward, California, elevation of 52 feet mean sea level (msl), reported at 0835, wind from 290° at 7 knots, 10 miles visibility, a broken ceiling at 800 feet above ground level (agl), overcast skies at 1,300 feet agl, temperature of 13 degrees Celsius (C), dew point temperature of 12 degrees C, and an altimeter setting of 29.95 inches of mercury. Remarks: automated station with a precipitation discriminator, rain began at 0822 and ended at 0831 PDT, ceiling varying between 600 and 900 feet agl, one-hourly precipitation of a trace, maintenance is needed on the system.

At 0854, HWD reported wind from 280 degrees at 5 knots, 10 miles visibility, a broken ceiling at 800 feet agl, overcast skies at 2,500 feet agl, temperature of 14 degrees C, dew point temperature of 12 degrees C, and an altimeter setting of 29.95 inches of mercury. Remarks: automated station with a precipitation discriminator, rain began at 0822 and ended at 0831 PDT, ceiling varying between 600 and 1,400 feet agl, sea-level pressure of 1015.3 hPa, one-hourly precipitation of a trace, temperature 13.9° degrees C, dew point temperature of 12.2 degrees C, maintenance is needed on the system.

At 0919, HWD reported wind from 270 degrees at 7 knots, 10 miles visibility, few clouds at 800 feet agl, a broken ceiling at 1,600 feet agl, overcast skies at 4,700 feet agl, temperature of 14 degrees C, dew point temperature of 12 degrees C, and an altimeter setting of 29.95 inches of mercury. Remarks: automated station with a precipitation discriminator, maintenance is needed on the system.

The Livermore Municipal Airport (LVK), Livermore, California, was located 8 miles east of the accident site, at an elevation of 400 feet msl, also had an ASOS. At 0853, LVK reported wind from 240 degrees at 8 knots, 10 miles visibility, a broken ceiling at 1,500 feet agl, overcast skies at 2,000 feet agl, temperature of 15° C, dew point temperature of 10 degrees C, and an altimeter setting of 29.94 inches of mercury. Remarks: automated station with a precipitation discriminator, sea-level pressure 1013.8 hPa, temperature 15.0 degrees C, dew point temperature 10.0 degrees C.

The closest sounding was from Oakland, California. The 0500 sounding indicated a relatively moist environment from the surface to 4,000 feet msl in a conditionally unstable environment. With any lifting mechanism in the area of the accident site, such as a mid-level trough or hilly terrain, the formation of clouds would be expected in the moist conditionally unstable environment. The Rawinsonde Observation program (ROAB) indicated that clouds were likely from the surface through 4,000 feet msl and this is consistent with the observations from HWD and LVK.

Visible and infrared data from the Geostationary Operational Environmental Satellite number 15 (GOES-15) indicated abundant cloud cover over and around the accident site at the accident time with that cloud cover moving from west to east. The imagery indicated that the approximate cloud-top heights over the accident site were 7,000 feet at 0845.

Two pilot reports (PIREPs) from unknown types of aircraft were received over San Francisco, California, at 0646; an overcast ceiling at 700 feet msl with tops to 4,300 feet msl during the climb from San Francisco (SFO), and an overcast ceiling at 800 feet msl with tops to 3,000 feet msl during descent into SFO.

An AIRMET Sierra, issued at 0745, forecasted IFR conditions with ceilings below 1,000 feet agl, visibilities below 3 miles, precipitation, and mist.

An area forecast, issued at 0345, forecasted an overcast ceiling at 2,000 feet msl with tops at 6,000 feet msl. The ceiling was forecasted to become broken at 3,000 feet msl by 0800 with isolated light rain showers.

Terminal Aerodrome Forecast (TAF) issued at 0442, and valid at the accident time, forecasted wind from 220 degrees at 5 knots, greater than 6 miles visibility, and a broken ceiling at 2,500 feet agl. This TAF accurately forecasted the weather conditions at LVK at the time of the accident. However, the ceiling and visibility conditions were likely lower at the accident site at the accident time, given the surface observations reported at HWD and the surrounding weather environment.

The DUATs weather briefing that the pilot received prior to the accident flight provided the Area Forecast issued at 0345, AIRMET Sierra for IFR conditions and mountain obscuration, and the two PIREPs from KSFO. TAFs for locations along the route of flight and winds aloft were also provided. The official weather briefing from DUATs specifically mentioned IFR conditions along the route of flight given that the AIRMET was briefed.

The complete weather report is appended to this accident in the public docket. AIRPORT INFORMATIONThe six-seat, single-engine, high-wing, retractable landing gear airplane, serial number 21058742, was manufactured in 1966. It was powered by a Continental Motors IO-520-A engine, serial number 111396-6-A, rated at 285 horse power. The airplane was also equipped with a McCauley three bladed constant speed propeller, model D3A34C402-C. A review of maintenance records showed that the most recent annual inspection was completed May 17, 2015, at a total aircraft time of 3,811.6 hours, and tachometer time of 721.3 hours. WRECKAGE AND IMPACT INFORMATIONExamination of the accident site revealed that it was located on the side of a hill, at an elevation of 1,237 feet msl. The airplane wreckage was spread along a 230-foot-long upsloping debris path through grass on an approximately heading of 044 degrees magnetic. The main wreckage came to rest at an elevation of about 1,257 feet msl.

The first point of impact is a ground scar about 10 inches wide containing a piece of a green lens, and a piece of a wing structure. The ground scar extended about 17 feet into a large area of disturbed dirt. A propeller slash mark was found about 16 feet from the initial point of impact. About 43 feet northeast-east from the first point of impact were one of the airplane's propeller blade, and a right wing lift strut. Plexiglas, portions of engine cowling, engine mount structure, and fuselage debris were scattered across the ground beginning at the first point of impact, and extended to the main wreckage. Another propeller blade was located about 115 feet from the first point of impact.

The terrain from the first point of impact to where the airplane's main wreckage came to rest was upsloping, at an angle of approximately 9 degrees. The main wreckage was located 145 feet from the first point of impact, and consisted of the airplane's engine, right wing, right landing gear, aft fuselage, ...