N85ATTimothy J Cowper PITTS SPECIAL S-1E · 2012

On September 29, 2013, about 1555 eastern daylight time, an experimental, amateur-built Cowper Pitts Special S-1E, N85AT, was destroyed following a collision with terrain after an in-flight loss of control near Edinburg, New York. The private pilot was fatally injured. The airplane was operated by the pilot under the provisions of 14 Code of Federal Regulations (CFR) Part 91 as a personal flight. Visual meteorological conditions prevailed and no flight plan was filed. The flight originated at Plateau Sky Ranch Airport (1F2) about 1550.

One witness was at 1F2 when the accident occurred. He stated that the accident pilot was airborne for about five minutes prior to the crash. Initially, he did not pay attention to the airplane attitude because "all sounded normal." He noticed that there was an increase in RPMs, so he turned toward the airplane and saw it "banked and nose down towards the ground." He observed the airplane disappear below the tree line and all went quiet. He ran around a hangar and observed smoke coming from the accident site.

Another witness was on a nearby road and observed the accident airplane "flying upside down." The airplane was "teetering" back and forth as if trying to right itself. After about 15 seconds, it went down into the trees.

Another witness reported that he observed the airplane descend "really fast" toward a tree line and suddenly come back up. The airplane then circled east again and "went straight down" into a tree line.

The pilot, age 55, held a private pilot certificate with airplane, single engine land privileges. His personal pilot logbook was not located after the accident. He reported a total flight time of 460 hours on his latest FAA third class medical certificate application of November, 2012. He also possessed an experimental aircraft builder certificate and was the registered builder of the accident aircraft.

The accident aircraft was a single-seat, experimental, amateur-built, bi-wing design airplane, equipped with a single Lycoming O-360-A4A engine, rated at 180 horsepower. According to registration and airworthiness documents on file with the FAA, the airplane was built in 2012 and a Special Airworthiness Certificate was issued on November 8, 2012. The aircraft and engine maintenance logbooks were not recovered after the accident.

The 1553 surface weather observation for Floyd Bennett Memorial Airport (GFL), Glens Fall, New York, located about 23 nautical miles east of the accident site, included sky clear, visibility 10 statute miles or greater, surface wind from 210 degrees at 7 knots, temperature 22 degrees C, dew point 11 degrees C, and altimeter setting 30.09 inches of mercury.

The accident aircraft was a single-seat, experimental, amateur-built, bi-wing design airplane, equipped with a single Lycoming O-360-A4A engine, rated at 180 horsepower. According to registration and airworthiness documents on file with the FAA, the airplane was built in 2012 and a Special Airworthiness Certificate was issued on November 8, 2012. The aircraft and engine maintenance logbooks were not recovered after the accident.

An inspector with the Federal Aviation Administration responded to the accident site and examined the wreckage. The main wreckage was located in a wooded area about one half nautical mile south-southwest of 1F2. The wreckage was confined to one area with no discernible linear wreckage path noted. A majority of the wreckage was consumed by a post-crash fire.

The wreckage was examined by the NTSB investigator-in-charge, assisted by an FAA inspector, on November 13, 2013, at a private storage facility.

Most of the fuselage's fabric skin was burned away, leaving the steel tube structure visible.

The rudder and elevator remained attached to the empennage by their hinges. The rudder was connected to the cockpit controls by cables. The left rudder cable remained attached to the rudder horn. Continuity was confirmed to left rudder pedal, which was broken free of the fuselage frame. The right rudder cable also remained attached to the rudder horn. The right rudder cable was separated about 2 feet aft of the connection on the right rudder pedal and exhibited signatures of overload. The right rudder pedal remained attached to firewall and frame. The elevator remained attached to empennage by its hinges. The steel push/pull tube led to the control stick in cockpit. There was a compression kink in the push/pull tube about midway to the cockpit. The rod was broken at the threaded end with signatures of bending overload. The upper portion of the cockpit control stick was broken off near its base and was not located. The lower end of the stick was attached to the airframe and exhibited overload signatures. The elevator trim tab was observed to be about 15 degrees tab down.

The wings were of wooden construction with fabric skin. A majority of the wing skin and wooden wing structure were consumed in the post-crash fire. The aileron push/pull tubes, hinges, and attachment hardware were examined; all fractures were consistent with overload. The ailerons were consumed by fire.

An external examination of the engine revealed impact and heat damage. The pressure carburetor was broken off from engine oil sump. A manual fuel primer pump and strainer remained in cockpit. The fuel strainer was disassembled and the bowl was found clear of debris. The fuel filter element showed heat distress (black and hard, crumbled when held in hand). Some brown-colored water remained inside the filter bowl. Top spark plugs were removed and photographed. The electrodes were normal in color with minimal wear observed. The plugs were tested on Champion test bench and all operated normally. The ignition harness wires appeared to be undamaged. The interior of the cylinders and the piston heads were examined with a lighted borescope; no anomalies were noted.

The propeller could be moved about 10 degrees due to propeller flange impact damage and deformation of the propeller blades. One blade was bent forward about 20 degrees. The opposite blade was bent aft about 60 degrees, with blade tip curl, blade twist, chord wise scratching, and surface polishing noted. The propeller spinner showed indications of twisting deformation around the propeller hub.

A postmortem examination of the pilot was performed at the Albany Medical Center, Albany, New York, on September 30, 2013. The autopsy report noted the cause of death as "Multiple severe traumatic blunt force injuries" and the manner of death was "Accident."

Forensic toxicology testing was performed on specimens of the pilot by the Federal Aviation Administration (FAA) Bioaeronautical Sciences Research Laboratory (CAMI), Oklahoma City, Oklahoma. The CAMI toxicology report indicated no carbon monoxide, ethanol, or drugs present. Testing for cyanide was not performed.