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The pilot reported that at 11,000 feet on climb out of Bangkok the Traffic Collision Avoidance System (TCAS) gave a traffic alert message immediately followed by a 'climb, increase climb' warning. Evasive action was taken. The initial navigation display indicated traffic at a range of one half to one nautical mile ahead in the 12 o'clock position, 300 feet above and in level flight. Air Traffic Control reported no traffic in the area. Visibility was about 10 kilometres in haze and no aircraft was sighted in that position. Subsequent investigation revealed no defect with TCAS equipment.
Download Final Report
[ Download PDF: 11KB]
General details
Date: 21 April 1993 Investigation status: Completed 
Time: 8:45 UTC  
 Investigation type: Occurrence Investigation 
 Occurrence type: ACAS warning 
Release date: 30 August 1993 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
Aircraft details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 747-438 
Aircraft registration: VH-OJG 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Bangkok Thailand
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Last update 23 July 2015