On May 28, 1999, at 1630 central daylight time, a Piper PA-30B twin-engine airplane, N7991Y, was substantially damaged during a forced landing following a loss of engine power after takeoff from the McAlester Regional Airport near McAlester, Oklahoma. The instrument rated private pilot and his pilot rated passenger were not injured. The airplane was owned and operated by the pilot. Visual meteorological conditions prevailed and a flight plan was not filed for the 14 Code of Federal Regulations Part 91 personal flight destined for Oklahoma City, Oklahoma. The cross-country flight was originating at the time of the accident. During a telephone interview conducted by the NTSB investigator-in-charge, the pilot stated that shortly after takeoff, while climbing through 300 feet agl, the left engine "quit." The pilot added that after attempting to restart the engine, he elected to feather the propeller. Shortly after feathering the left propeller, the right engine started to "sputter." The pilot stated that the right engine never completely failed; however, he was unable to maintain altitude with the sputtering right engine and elected to land the airplane, with the landing gear retracted, in a field approximately 2 miles south of the McAlester Airport. In the enclosed Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2), the pilot stated that he "had to climb over power lines [and] stalled [the] aircraft." The pilot reported that the left wing spar, outboard of the engine, was broken. The right wing spar, outboard of the engine, was bent aft, and the empennage was separated except for a section of sheet metal attaching it to the airplane. The pilot reported that he had refueled the airplane with 90 gallons of fuel prior to his departure. The pilot stated that he had visually checked the fuel level prior to the departure; however, he did not sump the fuel tanks. He added that the flight to McAlester earlier that day had been uneventful and that there were no problems with either engine. During the recovery process, fuel samples were taken from the airplane's left and right main fuel tanks. A half-gallon of fuel was drained from each tank into two separate 1-gallon containers. The bottom half of the sample taken from the left main fuel tank appeared clear in color and resembled water. The bottom 1/8th of the half-gallon fuel sample taken from the right main fuel tank appeared clear in color and also resembled water. The remaining fluid in both samples was blue in color and resembled 100LL aviation fuel. The FAA inspector, who responded to the accident site, stated that he examined fuel samples taken from the fixed base operator's fueling truck, from which the accident airplane was refueled, and found no evidence of water contamination.