thai airways flight 311 air crash investigation

A flap fault occurred while the flight was on the approach; this caused the crew to ask for clearance back to Calcutta, a decision that was in keeping with both Company and performance requirements, which necessitate the use of full flaps for … The crew response to the clearance was to report that, at the moment, they couldn't land and to ask again for left turn back to Romeo to start their approach again. The episode is titled "The Lost Plane". Authorities recovered the flight data recorder, which could yield clues to the cause of the crash. The Controller, in the non-radar environment, responded by clearing the flight to make the Sierra approach, which starts at the 202 radial and 16 nautical miles from the VOR.

When Thai Airways Flight 311 crashed into a remote area of the Himalayas on July 31, 1992, investigators needed to get to the site quickly to pull evidence. Thai Airways International Flight 261 (TG261/THA261) was a scheduled domestic passenger flight from Bangkok's Don Mueang International Airport, Thailand to Surat Thani International Airport in Surat Thani, Thailand.The flight was operated by Thai Airways International, the flag carrier of Thailand. It was again established that the flight was to proceed to Romeo and the crew agreed to "report over Romeo." On August 24, 1999, Uni Air Flight 873, a MD-90, caught fire after a passenger's carry-on luggage containing gasoline was ignited by a motorcycle battery contained in another passenger's carry-on luggage. At that time the crew encountered a flap malfunction during the approach which forced the crew to divert the aircraft to the nearest airport (Calcutta Airport) with the longer runway. After further dialogue with the controller, which included requests for a left turn, the crew unilaterally initiated a right turn from the aircraft's 025 degree heading and commenced a climb from an altitude of 10,500 feet to FL180, when the flight was about 7 nm south of the Kathmandu VOR. The tower on the other hand requested flight 311 to report after reaching 16nm from Sierra. Every page goes through HS-TID, the aircraft involved in the accident seen at Don Mueang International Airport in April 1992Crash site of Thai Airways Flight 311, located between Ghopte and Tharepati Pass, Nepal, and photographed in May 2016Photographs from the crash site taken in October 1992The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. Nepalese authorities found that the probable causes of the accident were the captain's and air traffic controller's loss of Thai Airways retired the flight number 311 after the accident along with its counterpart flight number 312, which had been used for the outbound flight from Kathmandu to Bangkok. The flight continued towards the north on a heading of 025 degrees and then, at about 16 nm to north, the heading was altered to the left by 005 degrees. During the turn there was more conversation carried between the tower controller and thecrew of the flight that where it was established that the aircraft was to maintain an altitude of FL115 and was to “proceed to Romeo” and contact the Area Control Center (ACC) controller.The flight start to descent during the complete turn of 360-degree turn, some moment later the aircraft was rolling out on headings of 045 and 340 degrees and again was proceeding towards the north on a heading of 025 degrees magnetic. 27 people were injured with one fatality as a result of the cabin fire. Black box flight recorders are often used by air crash investigators to review ... Nepal with the search and investigation. The air­craft's first flight was on 2 Oc­to­ber 1987, and it en­tered ser­vice with Cana­dian air­line War­dair under the reg­is­tra­tion C-FGWD. The flight, commencing a descent while in the turn, completed a 360-degree turn, momentarily rolling out on headings of 045 and 340 degrees, and again proceeded toward the north on a heading of 025 degrees magnetic.

Air-Nav System LLC USA, Country Manager for Nepal. At that time the crew encountered a flap malfunction during the approach which forced the crew to divert the aircraft to the nearest airport (Calcutta Airport) with the longer runway. The crew then responded that they couldn’t land and again asked for left turn back to Romeo and initiated the approach back again.Later the traffic controller had requested to make a left turn but the crew unintentionally initiated to right from the aircraft’s 025 degree heading and commenced a climb from an altitude of 10,500 feet to FL180 when the flight was about 7 nm south of the Kathmandu VOR. Engine thrust was increasing and "Level Change" had been announced on the cockpit, just before the impact occurred at the 11,500-foot level of a 16,000-foot peak; the accident site was located on the 015 radial (north-north east) at 23.3 nm from the Kathmandu VOR.PROBABLE CAUSE: "TG311 flight crew's management of the aircraft flight path wherein the flight proceeded in a northerly direction which was opposite to the cleared point Romeo to the South; ineffective radio communication between the area control centre and the TG311 flight crew which allowed the flight to continue in the wrong direction, in that the TG311 crew never provided the aircraft's VOR radial when stating DME and the controller never solicited this information and thus the aircraft's position was not transmitted at any time; and ineffective cockpit crew coordination by the TG311 crew in conducting flight navigation duties.

This Air­bus A310-304 for­mally en­tered ser­vice with Cana­dian Air­lines from 15 Jan­u­ary 1990 (with the same reg­is­tra­tion). The controller handling Flight 311 assumed from the flight's transmissions that the aircraft had called off the approach and was turning to the south, and he therefore cleared the aircraft to 11,500 feet (3,505 m), an altitude that would have been safe in the area south of the airport. Thai Airways has service to 35 countries and popular destinations including Bangkok, Seoul, Hanoi and more. Shortly after 21 seconds at the direction of 12 nm from Kathmandu VOR, the flaps were again back to the normal operating conditions. The crew stated to the control tower that they wished to start their approach again and requested a left turn back to the Romeo fix, which is 41 nm south south-west (202 radial) of the Kathmandu VOR. The Controller from the non-radar facility tower at TIA allowed the crew to make the Sierra Approach, starting at the 202 radial and 16 nautical miles from the VOR.