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A Boeing 747 (B747) was en route between Sydney and Perth, tracking via air route Q158. The crew contacted Perth air traffic control at waypoint BIDDY, and were issued with a standard terminal arrival route (STAR) to Perth. The controller and the crew entered into a discussion regarding Perth STARs. The crew were asked if the aircraft was Area Navigation (RNAV) equipped and replied that the aircraft was not so equipped. Aircraft that are not RNAV equipped are not permitted to track on air route Q158 from Sydney to Perth.

The investigation subsequently revealed that the aircraft was RNAV equipped and therefore, permitted to use Q158. There was no infringement of separation standards.


As a result of this and a similar occurrence, the Bureau of Air Safety Investigation is currently investigating a perceived safety deficiency. The deficiency relates to the notification of approved long range navigation systems to ATS.

Any safety output issued as a result of this analysis will be published in the Bureau's Quarterly Safety Deficiency Report

General details
Date: 26 October 1998 Investigation status: Completed 
Time: 2300 hours WST  
Location   (show map):Biddy Investigation type: Occurrence Investigation 
State: Western Australia Occurrence type: Miscellaneous - Other 
Release date: 19 July 1999 Occurrence class: Operational 
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 747 
Aircraft registration: ZS-SAN 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Sydney, NSW
Departure time:1912 hours WST
Destination:Perth, WA
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Last update 13 May 2014