Fort Pierce

According to the pilot, he checked the fuel gauges before departure and believed he had enough fuel for the flight. As he approached his destination airport, he was instructed by an air traffic controller to enter a 2-mile left base. About 3 miles from the airport, the controller advised him to intercept a 6-mile final. About 1 1/2 miles from the runway, the left engine “quit.” The pilot repositioned the fuel valve to the left inboard fuel tank and was able to restart the engine, but, shortly after, the right engine “quit.” He then attempted to reposition the right fuel valve to the right inboard fuel tank to restart the right engine, but the left engine “quit” again, and the pilot subsequently made a forced landing in a field. An examination of the engine and airplane systems revealed no anomalies that would have precluded normal operation. The left wing fuel tanks were found empty. The right wing was found separated from the fuselage. No evidence of fuel was noted in the right wing fuel tanks, and no evidence of fuel leakage was found at the accident site. The pilot reported that he saw fuel leaking out of the right wing fuel vent after the accident; it is possible that a small quantity of the airplane’s unusable fuel for the right tank could have leaked out immediately after the accident. Although the pilot believed that the airplane had enough fuel onboard for the flight, his assessment was based on his calculations of the airplane’s fuel burn during several short flights he made after having the airplane topped off with fuel the night before the accident; he did not visually check the fuel level in the tanks before departing on the accident flight. The lack of fuel in the fuel tanks, the lack of evidence of fuel leakage, the loss of engine power in both engines, and the lack of mechanical anomalies are consistent with fuel exhaustion.

Witnesses stated that they observed the twin-engine airplane roll into a steep right bank and enter a spin at a low altitude (less than 700 feet) during the initial climb. The airplane then descended and impacted terrain about 1.5 miles from the end of the departure runway. Some witnesses reported hearing an unusual engine noise just before the airplane began to roll and spin. Day visual meteorological conditions prevailed. Examination of the right engine revealed that the ring gear support of the engine/propeller gearbox had fractured in flight due to high cycle fatigue originating from the corner radii of the high-speed pinion cutout. The reason for the fatigue could not be determined. The ring gear support disengaged from the ring gear due to this failure, resulting in a disconnection in power being transferred from the engine power section to the propeller. In addition to the ability for a pilot to manually feather the propellers, and an automatic feathering feature, the engine (Honeywell TPE-331) design also includes a “Negative Torque Sensing” (NTS) system that would automatically respond to a typical failed engine condition involving a propeller that is driving the coupled engine. Feathering the propeller reduces drag and asymmetric yawing due to the failed engine. All Federal Aviation Administration (FAA) certification evaluations for one-engine inoperative handling qualities for the airplane type were conducted with the NTS system operational. According to the airplane manufacturer, the NTS system was designed to automatically reduce the drag on the affected engine to provide a margin of safety until the pilot is able to shut down the engine with the condition lever. However, if a drive train disconnect occurs at the ring gear support, the NTS system is inoperable, and the propeller can come out of feather on its own, if the disconnect is followed by a pilot action to retard the power lever on the affected engine. In this scenario, once the fuel flow setting is reduced below the point required to run the power section at 100% (takeoff) rpm, the propeller governor would sense an “underspeed” condition and would attempt to increase engine rpm by unloading the propeller, subsequently driving the propeller out of feather toward the low pitch stop. This flat pitch condition would cause an increase in aerodynamic drag on one side of the airplane, and unanticipated airplane control difficulty could result due to the asymmetry.

The Learjet departed from an uncontrolled airport about 2 minutes before the accident on a on a VFR climb and was not talking to ATC. The Extra EA-300S departed VFR from a controlled airport and requested and received a frequency change from the control tower 2 minutes after departure. Review of radar data revealed that the Extra climbed to 2,500 feet on a heading of 346 degrees before descending to 2,400 at 1141:25. The Learjet was observed on radar in a right crosswind departure passing through 700 feet on a heading of 242 degrees at 1141:02. At 1141:16, the Learjet was at 1,400 feet heading 269. At 1141:30, the Extra is observed on radar at 2,400 feet, in a right turn heading 360 degrees. The Learjet is observed on radar at 1141:28 in a climbing left turn passing through 2,300 feet. The last radar return on both aircraft was at 1141:30.

After obtaining a weather briefing in which he was informed of thunderstorms and current sigmets for his intended route of flight, the pilot elected to depart his home airport on a personal flight. At the time of departure, witnesses indicated the presence of thunderstorms adjacent to the airport. After trying to obtain his IFR clearance from charlotte, the pilot was issued his IFR clearance when approaching Columbia, SC. The pilot had deviated around at least one thunderstorm while approaching Columbia. The pilot had been cleared to climb to his requested altitude of 17,000 feet and had reached 16,400 when the radar return was observed to indicate a descent and then was lost. Witnesses on the ground reported seeing the airplane exit the clouds in flames. The evidence indicated that the horizontal tail had separated followed by the wings and other components of the airplane. No evidence of separation due to structural weakening from heating was found. All four occupants were killed.

The aircraft crashed at night near a private strip in marginal weather conditions. The gear was found in the up position, the right engine was broken off, the nose section was crushed back to the windshield, and both propellers were bent and twisted. About 1,300 lbs of marijuana was found on board.

En route from Hilton Head to Fort Pierce, the pilot encountered engine problems and elected to make an emergency landing. He reduced his altitude and attempted to land near Vero Beach when the airplane struck trees and crashed. The airplane was damaged beyond repair and both occupants escaped with minor injuries.