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PKGIB was tracking from Taroom to Udiko. JA8182 was tracking from Rockhampton to Armidale. Both aircraft were cruising at flight level 370 (F370). The tracks cross at approximately 60 nautical miles (nm) east of Taroom. PKGIB was instructed to descend to F350 and to be established at that level by 20nm east of Taroom. Due to language problems between the controller and the Indonesian crew, the controller was later not certain whether the crew had understood the clearance to be level at F350 by 20nm (the lateral separation point) or 30nm east of Taroom. After some further discussion, the controller finally established that the aircraft had not levelled at F350 until 41nm east of Taroom thereby compromising procedural separation standards.
Download Final Report
[ Download PDF: 15KB]
 
 
 
 
General details
Date: 18 May 1993 Investigation status: Completed 
Time: 5:30 EST Investigation type: Occurrence Investigation 
 Occurrence type:Loss of separation 
 Occurrence class: Airspace 
Release date: 19 October 1993 Occurrence category: Incident 
Report status: Final  
 
Aircraft 1 details
Aircraft manufacturer: McDonnell Douglas Corp. 
Aircraft model: DC-10 
Aircraft registration: PK-GIB 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Bali Indonesia
Destination:Auckland NZ
Aircraft 2 details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 747 
Aircraft registration: JA8182 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Tokyo JAPAN
Destination:Sydney NSW
 
 
 
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Last update 23 July 2015