ERA13FA184

The pilot's failure to detect multiple indications and cues in the cockpit of the steady loss of engine oil pressure, which resulted in a catastrophic engine failure over terrain unsuitable for landing. Also causal was the loss of internal engine lubrication for reasons that could not be determined during postaccident examinations due to postcrash fire damage.

The airplane was in cruise flight about 5,000 feet mean sea level (msl) in instrument meteorological conditions when the pilot declared an emergency and reported a loss of "fuel pressure" and engine power. The air traffic controller vectored the airplane toward the nearest airport, and, during the descent and when the airplane was about 6 miles from the airport, the pilot reported that smoke was in the cockpit and that the engine was "barely" producing power. No further transmissions were received from the pilot. The airplane collided with flat, wooded terrain and was significantly damaged by postcrash fire. Data downloaded from the primary and multifunction cockpit displays indicate that the engine began steadily losing oil pressure during the airplane's initial climb until it leveled off at a cruise altitude of 5,000 feet msl. Data suggest that, at that time, the pilot leaned the fuel mixture for cruise flight. Although the pilot could have detected the decreasing oil pressure at that time, he did not report a loss of fuel pressure and engine power to the air traffic controller until about 6 minutes later. Data also indicate that there were multiple additional indications and cues of a loss of engine oil pressure in the cockpit but that the pilot did not respond to these in a timely manner. The operations manual indicates that the pilot should land as soon as possible if the engine oil pressure drops and then to prepare for a loss of engine power and an emergency landing. The pilot's delayed recognition of the drop in engine oil pressure was likely the result of a breakdown in her instrument scan, specifically, her systems monitoring during the climb and initial cruise phases of flight, during which time, her attention was likely directed at airplane control, power management, and navigation. The reason for the loss of engine oil pressure could not be determined during postaccident examinations due to postcrash fire damage.

HISTORY OF FLIGHT On March 31, 2013, at 1250 eastern daylight time, a Lancair LC42-550FG, N6506L, was destroyed when it collided with trees and terrain during a forced landing after a loss of engine power near Smith Reynolds Airport (INT), Winston-Salem, North Carolina. The commercial pilot and pilot-rated passenger were fatally injured. Instrument meteorological conditions prevailed, and an instrument flight rules flight plan was filed for the flight which originated from Wilkes County Airport (UKF), North Wilkesboro, North Carolina, at 1230, and was destined for Warren Field Airport (OCW), Washington, North Carolina. The personal flight was conducted under the provisions of Title 14 Code of Federal Regulations Part 91. Information from the Federal Aviation Administration (FAA) revealed that the flight departed UKF at 1230 and climbed to 5,000 feet. The flight was in cruise flight about 5,000 feet when at 12:46.34, the pilot declared an emergency and reported a "low fuel pressure – engine's quitting." The air traffic controller vectored the airplane toward INT, and during the descent the pilot reported smoke in the cockpit and subsequently reported that the engine was "barely" producing power. At last report, the airplane was about 6 miles from INT, and no further transmissions were received from the pilot. In an email, one witness stated that he heard the airplane, but could not see it due to low, irregular clouds. He said the airplane was "making a slightly uneven noise – like a sputter but more like its power was changing erratically." The witness further stated that the sound of the engine didn't not fade gradually as he expected, but "went abruptly silent." He later learned that the airplane crashed about six miles from the spot where he heard the sounds overhead. Another witness reported to police that he saw the airplane flying just above the trees. He stated that the airplane was not trailing smoke, and that the propeller was not rotating. A third witness said the airplane was flying close to the tops of the trees, and the engine was sputtering as though it "may have run out of gas." A fourth witness reported seeing a "large blue object" just above the fence in her back yard before it exploded and burst into flames. She stated she heard no noise and didn't discover the object was an airplane until later. PERSONNEL INFORMATION The pilot held a commercial pilot certificate with ratings for airplane single-engine land and instrument airplane. Her most recent FAA third-class medical certificate was issued on December 2, 2011, and she reported 800 total hours of flight experience on that date. An examination of the pilot's logbook revealed about 963 total hours of flight experience, 291 hours of which were in the accident airplane make and model. The pilot-rated passenger held a private pilot certificate with ratings for airplane single-engine land and instrument airplane. His most recent third-class medical certificate was issued on November 19, 2010 and he reported 300 total hours of flight experience on that date. Examination of the pilot-rated passenger's logbook revealed that it was severely damage by fire and water. The total hours of flight experience, and time in make and model could not be determined, however it's estimated that the total hours of flight experience were about 460 hours. The last entries in the logbook appeared to be in December 2012 based on entries in previous pages. AIRCRAFT INFORMATION The airplane was manufactured in 2003, and was a pre-molded, composite built, semi-monocoque, four-seat, single engine, low wing, tricycle design airplane. The airplane was certified in the utility category and was used primarily for transportation and general aviation uses. The airplane was equipped with a Continental IO-550N, 310-horsepower engine. Examination of FAA records and copies of maintenance receipts revealed its most recent annual inspection was completed July 26, 2012 at 1,088 aircraft hours. Subsequent to the annual inspection, the airplane underwent service and maintenance on five occasions. The work included an oil change, alternator change (2), and a starter adapter change. Each time an engine run was performed and a leak check was noted. The most recent maintenance run and leak check was annotated February 11, 2013. Engine oil history A review of the maintenance records revealed that the previous owner of the airplane had engine oil leaks corrected during 2009 and 2010. The repairs to and replacement of pushrod tubes, rocker covers, sump gaskets, and a front crankshaft seal were noted. Further, the Nos. 1, 2, and 5 cylinders were replaced on September 28, 2010. On July 25, 2012, during the owner's pre-purchase inspection of the airplane, the left magneto oil seal was replaced due to "leaking." No further engine oil leaks were noted in the airplane's maintenance records. METEOROLOGICAL INFORMATION At 1254, the weather conditions reported at INT, at 969 feet elevation and 4 miles east of the accident site, included an overcast ceiling at 800 feet, visibility 7 miles, temperature 13 degrees C, dew point 11 degrees C, and an altimeter setting of 29.89 inches of mercury. The winds were from 240 degrees at 7 knots. WRECKAGE AND IMPACT INFORMATION The accident site was located on flat, wooded terrain in a residential area approximately 3 miles west of INT, and all major components of the airplane were accounted for at the scene. The wreckage path was oriented approximately 078 degrees magnetic and about 400 feet in length. The initial impact point was in a tree top; about 50 feet above the ground, and fragments of the airplane were distributed along the wreckage path. The cockpit, cabin area, and engine compartment were consumed by postcrash fire. The main wreckage rested on its left side, and had been cut and displaced by first responders. Control continuity could not be determined due to significant fire damage, but flight control components that were examined exhibited fractures consistent with overload failure. The engine remained in its mounts, attached to the fuselage, and each of the three propeller blades exhibited aft bending and spanwise scratching. The engine was severely damaged by fire and impact. The engine oil sump was completely burned away, and the engine case exhibited holes from both internal and external impact. Due to the extent of the damage, and the hazard of burned composite materials, no examination of the engine was conducted on site. The engine was retained for a detailed examination at a later date. No evidence of oil streaking or staining of the airframe could be identified, as the airframe surrounding and aft of the engine compartment was completely destroyed by fire. The tail section was separated from the airplane, and displayed impact and postcrash fire damage. The exterior surfaces were stained from soot consistent with the postcrash fire. MEDICAL AND PATHOLOGICAL INFORMATION The Wake Forest University School of Medicine, Department of Pathology performed the autopsies on the pilot and the pilot-rated passenger. The autopsy report indicated that each died as a result of "multiple injuries." The FAA's Bioaeronautical Sciences Research Laboratory, Oklahoma City, Oklahoma, performed toxicological testing of the pilot. The testing was negative for drugs, alcohol, and carbon monoxide. TESTS AND RESEARCH The engine was examined in Mobile, Alabama at the manufacturer's facility under the supervision of an NTSB senior air safety investigator. The engine exhibited significant impact and thermal damage, and the crankcase was breached above the Nos. 4, 5, and 6 cylinders. Disassembly revealed connecting rod, bearing cap, piston skirt, and hardware fragments in the oil sump. These fragments could not be matched with their associated engine components. The Nos. 1 and 2 connecting rod assemblies were intact, but displa