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The pilot reported "Leaving Flight Level 370 for Flight Level 350" when the aircraft was about 320 kilometres to the north of Perth. The aircraft had not been cleared by Air Traffic Control to leave Flight Level 370 on descent. Investigation indicated that the pilot was only requesting a clearance to descend and his use of non standard radio transmission terminology gave the impression that the aircraft had already commenced descent. The aircraft remained at Flight Level 370 until cleared to descend by Air Traffic Control. There was no DEPARTURE from standard operational practice. This occurrence was not considered to be an air safety incident.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 08 December 1988 Investigation status: Completed 
Time: 2311  
Location:320 km North of Perth Investigation type: Occurrence Investigation 
State: Western Australia Occurrence type: Miscellaneous - Other 
Release date: 09 February 1989 Occurrence class: Operational 
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 747 
Damage to aircraft: Nil 
Departure point:Den Pasar, Indonesia
Destination:Perth WA
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Last update 13 May 2014