20020817019939A

(.19) On August 17, 2002, at 1129 eastern daylight time, a Cessna 172S, N35073, was destroyed after it impacted a parking lot shortly after takeoff from Robertson field (4B8), Plainville, Connecticut. The certificated private pilot and passenger were fatally injured. Visual meteorological conditions prevailed and no flight plan was filed for the personal flight conducted under 14 CFR part 91. According to a witness who was sitting outside the fixed base operator (FBO) at Robertson field, he observed the accident pilot performed a preflight inspection on the airplane. As the pilot started the engine, the witnesses observed a "puff of gray smoke" coming out of the engine, "as if the pilot had over-primed it." The engine then "smoothed out" and sounded normal during the taxi and initial takeoff from runway 02. As the airplane reached an altitude of 50 feet, the engine noise "changed, as if it had experienced a power reduction." Shortly after, the witness observed gray smoke trailing from the airplane, and it appeared the pilot was having trouble maintaining altitude. When the airplane was about 300-400 feet above the ground, a left turn was initiated, at a 45-degree bank. As the airplane continued the turn, the left wing dropped to a "pretty steep angle," before the descending below the tree line. Another witness, also sitting at the FBO, observed the airplane taxi to runway 02 and then takeoff. His attention was drawn back to the airplane when he heard the airplane's engine "sputtering" during its initial climbout. He observed black smoke from behind the airplane as it continued to climb, and the airplane then began a left turn and "banked steeply downward" until it impacted the ground. A third witness was a certified flight instructor (CFI), who had just landed on runway 02. According to the witness, he was taxiing to the ramp on a parallel taxiway, when he heard over the UNICOM frequency, "Robertson traffic, Cessna zero seven three departing runway two." The witnesses noticed the airplane when it was about half-way down the runway, at an altitude of 50 feet. The witnesses observed black smoke trailing from the airplane and announced over the UNICOM frequency to the pilot that he was "trailing smoke." The witness stated that the smoke continued to get heavier as the airplane climbed, and he could tell the airplane was "loosing speed." Again using the UNICOM frequency, the witness instructed the pilot to "lower the nose, lower the nose." He then observed the airplane initiate a steep, left turn with the nose of the airplane up "at a fairly high angle." After about 90 degrees of turn, the nose of the airplane dropped sharply, and after 180 degrees of turn, the airplane rolled back to a wings level attitude. The airplane then descended at a 45-degree angle until it impacted the ground. A fourth witness observed the airplane from a parking lot about 1,000 feet to the east. He stated that he heard the engine "cut out," and noticed black smoke trailing off the "port side" of the airplane. The engine was restarted and at an altitude of 400-600 feet, the engine "cut out again, completely." The airplane began a "sharp" left turn and the witness continued to observe smoke on the left side of the airplane, as well as a "small orange ball," just behind the propeller. The airplane then dropped at a 45-degree angle to the ground. A landscaper, working in a parking lot, heard the airplane's engine "sputtering." He then observed the airplane in a left bank, "just about to hit the trees." The landscaper ran from where he was working, and then heard an impact behind him. The airplane impacted a mulch pile, and a post crash fire ensued. The wreckage site was located in a parking lot, about 1 mile to the southwest of Robertson field, at an elevation of 256 feet. The initial impact point was a tree strike, about 35 feet above the ground. A portion of the left wingtip was observed at the base of the tree along with several 45-degree angular cut tree branches. A second impact point was a 1-foot 8-inch wide indentation in the asphalt pavement, about 5 feet from the first tree strike, along the wreckage path. The wreckage path was oriented on a heading of 230 degrees and extended 68 feet to the main wreckage. The main wreckage was consumed by the post-crash fire. The fuselage was oriented on a heading of 040 degrees, and all major components of the airplane were accounted for at the scene. The left wing was separated from the main fuselage and located inverted and adjacent to the nose of the airplane. The left aileron was attached to the wing, and both the wing and the aileron displayed severe fire damage. The right wing, cockpit, and main fuselage area were all consumed by the post-crash fire. The empennage section was separated from the fuselage aft of the rear cabin seats, and remained intact. Flight control continuity was established from the cockpit area to all flight control surfaces. The aileron control cables exhibited "broomstrawed" ends, consistent with tension overload. Examination of the flap actuator revealed the flaps were in the retracted position. The engine remained attached to the fuselage at the firewall, and the propeller was separated from the engine and located about 50 feet in front of it. The spinner displayed a concave dent, and pavement transfer scrapes were observed 1-foot 8-inches across both propeller blades and the spinner. Both propeller blades displayed chordwise scratching and moderate leading edge knicks. A 1-foot section of tree branch was located near the propeller, displaying 45-degree angular cuts and paint transfer marks. The engine was removed from the airplane and examined. The crankshaft was rotated at the vacuum pump drive, and compression and valve train continuity was confirmed to all cylinders. Borescope examination of the cylinders revealed no anomalies. The top and bottom spark plugs were removed and examined. They were black in color, and their electrodes were intact. Both the left and right magnetos could be rotated; however, spark could not be obtained due to the fire damage. The fuel injector was separated at its flange, and the fuel injector screen displayed no contamination. Severe fire damage was noted to the lower portion of the engine, including the exterior of the oil sump and the lower engine mounts. Examination of the engine-driven fuel pump revealed its base plate had melted away; and the threads of the outflow port were melted in a downward direction. The fuel hose which attaches to the outflow port of the engine-driven fuel pump had cleanly separated from its swedged fitting, and the fitting displayed severe discoloration and fire damage. The engine-driven fuel pump and fuel hose were retained for further examination. The airplane was a new 2001 model, Cessna 172S. Examination of the airplane and engine logbooks revealed the airplane had accumulated 70 hours of total flight time since it was delivered to the owner. The last annual inspection was performed on June 27, 2002, and no work had been conducted on the airplane since then. The airplane was last flown on June 10, 2002, and then was filled with fuel. The pilot held a private pilot certificate with ratings for airplane single engine land and instrument airplane. His most recent FAA third class medical was issued on January 7, 2001. At that time, he reported 269 hours of total flight experience. The weather reported at hartford-brainard airport (hfd), hartford, Connecticut, at 1053, included wind from 360 degrees at 4 knots, 10 miles visibility, clear skies, temperature 29 degrees, dew point 21 degrees, and an altimeter setting 30.01 inches hg. (-23) a/c departed r/w 02. A/c was trailing black smoke and engine was sputtering. A/c attempted to make a 180 degree left turn back to field. A/c crashed into business parking lot.