Landing (descent or approach)

During a cross-country flight, the pilot of the twin-engine airplane reported to air traffic control that he has 'lost an engine.' A witness observed the right engine hanging from its lower mounts as the airplane turned right and headed towards the nearest airport. The airplane impacted trees approximately 1 mile short of the runway threshold. Examination of the right engine propeller revealed that one of its blades was separated about mid-span. The separated tip section of the blade was not recovered. Metallurgical examination of the fracture surface revealed that the blade failed as a result of a fatigue crack that originated from corrosion pits on the camber surface (face) of the blade. The failed blade was examined approximately 6 hours prior to the accident in accordance with an airworthiness directive (AD 81-13-06 R2) that called for inspections of the blade for corrosion and fatigue. However, the inspections called out in the AD were only applicable to the blade fillet and shank regions, well inboard of the fracture location on the failed blade. Overhaul of the propeller in accordance with the propeller manufacturer's manual includes grinding of each blade to 'remove all visual evidence of corrosion.' According to the airplane's owner, the propellers had not been overhauled in the eight years that he had owned the aircraft. The maintenance records were destroyed in the accident, which precluded determination of the date and time of the last propeller overhaul. The accident airplane was being operated under Title 14 CFR Part 91, and therefore, the propellers were not required to be overhauled at specified intervals.

Following the 12th sport parachute jump of the day, which occurred after sunset, ground witnesses observed the airplane descend into the ocean in a left wing low, nose down attitude. They did not hear the engines sputtering or popping, or see the airplane make any erratic movements during its descent. Skydivers indicated that the two previous flights had been conducted at altitudes of at least 18,000 feet, and the accident flight and subsequent jump were made at 20,000 feet. During this final jump flight, one of the skydivers stated he had a hard time breathing and felt nauseous. The skydivers also noted that the pilot was unable to maintain a steady course and did not respond well to minor course corrections. No supplemental oxygen was found onboard the airplane during the recovery or subsequent inspection phases of the investigation. No skydiver observed the pilot using supplemental oxygen. The airplane manufacturer noted that the pressurization system would have been rendered inoperable due to a non-sealed cockpit door. Hypoxia is defined as a physiological condition where a person is bereft of needed oxygen. Judgment is poor and reaction time delayed. Total incapacitation coupled with a loss of consciousness can occur with little or no warning. The airframe, engines, and propellers were examined with no preexisting impact anomalies found.

The pilot refueled the auxiliary tanks of the airplane at a different airport 1 month prior to the accident, and had not flown on the auxiliary tanks since that time. He was repositioning the airplane back to home base after a series of revenue flights when the accident occurred. About 20 minutes after takeoff he positioned the left and right engines to their respective auxiliary fuel tanks, and then returned to the mains 30 minutes later. The right engine began to surge and subsequently stopped running. Turning on the fuel boost pump restarted the engine. Five minutes later the engine quit and he secured it after unsuccessful restart attempts. Then the left engine began to surge and was developing only partial power. He diverted to an alternate airport with decaying altitude and power in the remaining engine. Crossing the airport, he saw he was too high to land with a tailwind so he circled to land into the wind. On the base leg he made the decision to land straight ahead in a field due to power lines in his path, rapidly decaying altitude, and power. During the landing roll, the airplane collided with a ditch. The left and right main fuel filters contained a foreign substance, which upon laboratory examination, was found to be a polyacrylamide. This is a manmade synthetic polymer that is used as an agricultural soil amendment that aids in reducing soil erosion. Distribution of the polymer is typically not done by aircraft. Inspection of the fueling facility revealed that the employees who do refueling did not have any formal or on-the-job training. There was no record that the delivery system filters had been examined or changed. The maintenance to the truck, delivery system, and storage facility are done by the employees on an as needed, time permitted basis. The fuel truck was found to be improperly labeled, and the fuel nozzle was lying in a compartment amid dirt, gravel, and other contaminates with no caps or covers for protection.

After landing at Berberati Airport, the aircraft was unable to stop within the remaining distance. It overran, lost its undercarriage and came to rest with both wings severely damaged. All 33 occupants escaped uninjured while the aircraft was damaged beyond repair.

The flight was on approach, and the pilot was in radio contact with approach control. For unknown reasons the pilot performed a 360-degree turn, without permission from the controller, and was then vectored to a different runway. After acknowledging the clearance to the new runway, the controller lost all contact with the flight. None of the radio communications indicated that the pilot was having mechanical or medical problems. A search was initiated by air and a debris field was located. Five yellow life jackets, 1 six man life raft, several unidentified pieces of white and gold airframe were recovered. The pilot and the wreckage were never recovered from the water. At the time of the accident the pilot's license had been suspended by the FAA.

The crew was completing a local training flight at Loma Bonita Airport which has a 1,400 metres long 18/36 runway. After touchdown, the crew initiated the braking procedure but the aircraft was unable to stop within the remaining distance. It overran, rolled for about 100 metres then came to rest. All six occupants escaped uninjured. A fire erupted and destroyed the aircraft in few minutes as local firebombers were not sufficiently trained and well equipped.

The approach to Port Vila Airport was conducted by night and heavy rain falls. On final, the pilot lost control of the airplane that crashed in the sea about 11 km from the airport, 8 km offshore. Five people were rescued while seven others including the pilot were killed.

The airplane departed Houston, Texas, for a VFR flight to San Diego, California. The pilot in the left seat said that they originally planned to purchase fuel at Gila Bend, Arizona, but were told that the fueling was closed. The left seat pilot said they elected to land at a private airstrip and made arrangements to have an individual drive to Casa Grande airport to purchase fuel for them. The left seat pilot said they were worried about adequate runway length, so they elected to only purchase 65 gallons of fuel for the remainder of the flight to San Diego. En route to San Diego, the right seat pilot obtained weather for the destination from FSS and was advised of 1,000-foot overcast ceiling. The right seat pilot then requested and received an instrument clearance. The TRACON controller advised the pilot of the accident airplane that he would have to keep speed up due to jet traffic or be given delay vectors for traffic spacing. The pilot told ATC that they were fuel critical and later said they had about 45 minutes to 1 hour of fuel. The right seat pilot was cleared for the localizer runway 27 approach. Approximately 18 minutes later, the pilot elected to do a missed approach because he was too high to land and moments later told San Diego radar that he was fuel critical and only had about 5 minutes of fuel left. San Diego radar began to give the pilot vectors to the closest airport and told the pilot not to descend any further. The right seat pilot replied that they were a glider and later told San Diego police that they had run out of fuel. There were no discrepancies noted with either the airframe or the engines during the postaccident aircraft examination.

The twin-engine airplane impacted the ground in an uncontrolled descent following the inflight separation of the right wing during a normal descent. The airplane had accumulated a total time of 20,457 hours and had been flown 52 hours since the most recent annual inspection, which was performed by the current operator 3 weeks prior to the accident. Available maintenance records indicated that since 1988, maintenance personnel had made numerous repairs to the right wing, including repairing skin cracks, working rivets, wing stub spar straps, and the right main landing gear. Metallurgical examination revealed that the right wing's front spar failed due to fatigue that started at an area of mechanical damage and rough machining marks. The presence of primer covering the mechanical damage strongly suggests that the damage was produced during the manufacturing process. It could not be determined whether the mechanical damage or the machining, acting alone, could have caused the fatigue cracking to initiate. Fatigue cracking found on the rear spar and the forward auxiliary spar is most likely secondary fatigue due to load shedding as the crack grew in the front spar.

While on approach to land the left engine surged and lost power. The pilot switched the left engine fuel selector to another fuel tank and the engine restarted. A short time later the left engine surged and lost power again. The pilot switched the left engine fuel selector to the right main fuel tank and the engine again restarted. A short time later the left engine quit again and he shutdown the engine and feathered the propeller. A short time later the right engine surged and lost power. He shut down the right engine and feathered the propeller. He then made a forced landing in a field and during landing rollout the aircraft's left wing collided with a tree. A fire erupted in the left wing area. Post crash examination showed the right main fuel tank was empty. The right auxiliary fuel tank contained 2.5 gallons. The left main fuel tank contained one half gallon of fuel and the left auxiliary tank was ruptured. The pilot operating handbook stated that the main fuel tanks had one gallon unusable fuel and the auxiliary fuel tanks had one half gallon of unusable fuel.