Aviation safety investigations & reports

Boeing 747, 320 km North of Perth WA, 8 December 1988

Investigation number:
Status: Completed
Investigation completed


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[Download  PDF: 22KB]

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    
State: Western Australia   Occurrence type: Miscellaneous - Other  
Release date: 09 February 1989   Occurrence category: Incident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer The Boeing Company  
Aircraft model 747  
Damage to aircraft Nil  
Departure point Den Pasar, Indonesia  
Destination Perth WA  
Last update 13 May 2014