Plain, Valley

The twin engine aircraft was performing a special flight from Tobalaba to Concepción with a team of five experts from the Santo Tomás University. While descending to Concepción-Carriel Sur Airport in poor weather conditions, the twin engine aircraft hit tree tops and crashed in a wooded area located some 20 km north of the airport, near Tomé. All six occupants were killed. They should inspect installations in Concepción following the earthquake from 27FEB2010.
Pilot:
Marcelo Ruiz.
Passengers:
Ernesto Videla,
Pablo Desbordes,
Ignacio Fernández,
Rodolfo Becker,
Guillermo Moya.

On 11 February 2010, an Avions de Transport Regional ATR 42-300 aircraft, registered PK-YRP, was being operated by Trigana Air Service on a scheduled passenger service between Kalimarau Airport Berau (BEJ) and Samarinda (SRI) as flight TGN162. There were 52 persons on board; two pilots, one engineer, two flight attendants, one flight dispatcher and 46 passengers (43 adults, one child, and two infants). The aircraft departed from Berau at 0230 UTC1 and climbed to Flight Level 140. Balikpapan approach cleared the crew to track from en-route Way Point LOLOT direct to Samarinda. After transferring to Temindung Tower, Samarinda, the crew was cleared to track direct to left downwind for runway 04. The controller informed them that the wind was 060/12 knots. The crew did not report any abnormalities and the aircraft operation appeared to be normal. During the final approach for runway 04, the left ECU light illuminated followed by low oil pressure and torque indications. The Pilot in Command decided to go around, divert to Balikpapan, and carry out the QRH engine shut-down procedure. They commenced the climb to 4000 ft with the left engine inoperative. Approximately 16 Nm from Balikpapan Airport, while climbing through 3,800 feet, the right ECU light illuminated, immediately followed by low oil pressure and low torque indications. The right engine then failed. The crew broadcast a MAYDAY to Balikpapan Approach and decided to conduct a forced landing into a clear field in the Samboja area, about 16 Nm from the Balikpapan Airport. The PIC gave instructions to the Flight Attendant to prepare the passengers for an emergency landing. After the aircraft came to a stop the PIC initiated an evacuation.

The pilot was established on the localizer portion of the instrument landing system approach outside the final approach fix in visual meteorological conditions above clouds. He was then given vectors away from the localizer course by an air traffic controller. The vectors were close together and included a left 90-degree turn, a descent, and a 180-degree right turn back toward the localizer course. During the right turn and descent, the airplane continued turning with increasing bank and subsequently impacted the ground. According to a pilot weather report and flight path data the pilot entered clouds as he was starting the right turn toward the localizer. The combination of descending turns while entering instrument conditions were conducive to spatial disorientation. Further, the heading changes issued by the air traffic controller were rapid, of large magnitude, and, in combination with a descent clearance, likely contributed to the pilot’s disorientation. Diphenhydramine, a drug that may impair mental and/or physical abilities, was found in the pilot’s toxicological test results. While the exact effect of the drug at the time of the accident could not be determined, it may have contributed to the development of spatial disorientation.

Sole on board, the pilot was performing an illegal flight with a bag containing 25 kg of cocaine. While trying to land on a private airstrip in Punta Ocote, the twin engine aircraft hit tree tops and crashed on a road, killing an 18 years old motorcyclist. The aircraft was destroyed by a post crash fire and the pilot escaped uninjured.

Shortly after takeoff in the pressurized twin-engine airplane, the pilot was cleared to climb and maintain 16,000 feet. The pilot reported passing through instrument conditions with heavy snow and that he cleared the tops of the clouds at 7,000 feet. The pilot was then cleared to climb and maintain flight level (FL) 230. Radar data showed the airplane's altitude and course varied throughout the flight after having reached FL 230. Several times during the flight the air traffic controller questioned the pilot regarding his altitude and/or course. Each time the pilot responded that he was at the correct altitude and/or course. The radar data showed that after each of these conversations, the airplane would return to the assigned altitude and/or course. The controller then informed the pilot that, because radar showed the airplane’s altitude fluctuating between FL 224 and FL 237, he was going to have to descend out of positive controller airspace. The pilot acknowledged this transmission. The controller instructed the pilot to descend to 17,000 feet. The last transmission from the pilot was when he acknowledged the descent. Radar data showed that one minute later the airplane was at FL 234. During the last minute and 12 seconds of radar data, the airplane reversed its course and descended from FL 233 to FL 214, at which time radar data was lost. Witnesses reported hearing loud engine sounds and seeing the airplane in a spiraling descent until ground impact. Post accident inspection of the engines did not identify any anomalies that would have precluded normal operation. Most of the fuselage was consumed by fire; however, flight control continuity was established. Given the pilot’s experience and the flight’s altitude and course variations the investigation considered that the pilot may have suffered from hypoxia; however, due to the post impact fire the functionality of the airplane’s pressurization system could not be observed and no conclusive determination could be made that the pilot as impaired.

Before take off at Nouakchott, two fuel trucks arrived to the airplane but captain declined and calculated that the reserve he has was sufficient to fly to Bamako. While approaching Bamako, right engine failed due to fuel exhaustion, followed by the left engine five minutes later. Crew elected to divert to Kolokani, a small airstrip located 19 km from Bamako. Eventually, crew was forced to make an emergency landing off airport. On landing, aircraft lost its undercarriage while the right wing was sheared off. All nine occupants were uninjured while the aircraft was destroyed. Flight was performed on behalf of the 524th Special Operations Squadron, for the USAF and Africom, a military mission in Africa.

The pilot obtained three weather briefings before departure. At that time, the current weather along the route of flight showed significant convective activity and a moving squall line, and the forecast predicted significant thunderstorm activity along the planned route of flight. The pilot was concerned about the weather and mentioned that he would be looking for "holes" in the weather to maneuver around via the use of his on-board weather radar. He decided to fly a route further south to avoid the severe weather. Radar data indicates that, after departure, the pilot flew a southerly course that was west of the severe weather before he asked air traffic control for a 150-degree heading that would direct him toward a "hole" in the weather. A controller, who said he also saw a "hole" in the weather, told the pilot to fly a 120-degree heading and proceed direct to a fix along his route of flight. The airplane flew into a line of very heavy to intense thunderstorms during cruise flight at 25,000 feet before the airplane began to lose altitude and reverse course. The airplane then entered a rapid descent, broke up in flight, and subsequently impacted terrain. Review of recorded precipitation data showed that there was substantial information available to the controller about moderate to extreme weather along the aircraft’s route of flight. While the controller stated that he saw a hole or clear area ahead of the aircraft, this is contradicted by both the recorded data and the statement of a second controller working the D-position at the time of the accident. The first controller did not advise the pilot of the severe weather that was along this new course heading and the pilot entered severe weather and began to lose altitude. The controller queried the pilot about his altitude loss and the pilot mentioned that they had gotten into some "pretty good turbulence." This was the last communication from the pilot before the airplane disappeared from radar. Review of recorded precipitation data showed that there was substantial information available to the controller about moderate to extreme
weather along the aircraft’s route of flight. The controller did not provide advisories to the pilot regarding the adverse weather's immediate safety hazard to the accident flight as required by Federal Aviation Administration Order 7110.65. Examination of the recovered sections of flight control surfaces revealed that all of the fractures examined exhibited signs consistent with overstress failure. There was no evidence of preexisting cracking on any of the fracture surfaces examined and no preaccident anomalies were noted with the engines.

The pilot added fuel to the multi-engine airplane prior to departure. While en route to the destination airport, the pilot noted that the fuel gauges indicated that the right main-tank appeared to be almost empty and the left tank appeared half full. The pilot initiated the crossfeed procedure in an effort to supply fuel to both engines from the left main tank. Shortly after beginning the crossfeed procedure, both engines experienced a total loss of power. The pilot notified air traffic control (ATC) and selected a field to perform a forced landing. Prior to touchdown, the right engine produced a surge of power and, in response, the airplane rolled to the left. The surge abruptly ended and the pilot continued the forced landing by lowering landing gear and extending the flaps. The airplane impacted the ground, coming to rest in an open field. A postimpact examination did not reveal any anomalies with the airframe or engine that would have precluded normal operation. Although both fuel tanks were ruptured, the accident scene did not contain a large amount of residual fuel. A small fuel slick was found on the surface of a nearby pond; however, the grass area underneath both wings did not contain dead grass; this would have been expected if there was more than a negligible amount of fuel in the tanks at time of impact.

The pilot was spraying a marshy area for mosquitoes. After making a spray pass, he made a right 180-degree turn to an easterly heading and the right wing struck a radio tower. The pilot didn't know the extent of the damage and there appeared to be a "controllability issue." He elected to land in a pasture. During the landing, the airplane struck and killed a cow and a bull, then collided with a pile of wood, resulting in substantial damage. The unlit 100-foot radio tower was within the walls of a correctional facility, was used for ground communications, and has been there for several years. It was not marked on sectional charts.

The crew departed Tehran-Mehrabad Airport for a local training mission. While cruising south of the capital city, the crew declared an emergency following an engine failure and elected to return. During the emergency descent to runway 29L, the radome located on the roof detached and hit the tail. Out of control, the aircraft crashed in an open field located near Varamin. The aircraft disintegrated on impact and all seven occupants were killed. It is believed that the radome detached because the aircraft' speed exceeded its certification during the emergency descent.