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The aircraft had been issued with an airways clearance to track from Ballidu to Perth. It was observed on radar to be diverging from this track until queried by Perth Air Traffic Control. The aircraft then turned in the appropriate direction but did not track directly for Perth until radar vectors were supplied. Maximum displacement from the cleared track was about 31 kilometres. The situation was constantly monitored by Air Traffic Control and no confliction occurred with any other aircraft. After landing the Captain advised that the primary navigation aid the Inertial Navigation System was giving erroneous information as to the actual position of the aircraft. Subsequent ground checking of the equipment failed to reveal any serious fault. It was considered that either the original computerised programme loaded into the aircraft system at Djakarta was faulty or the crew might have inadvertently introduced an error. Nevertheless other navigation equipment was apparently operating satisfactorily and would have indicated that the aircraft was not on the desired track. The procedures used by the crew to cross-check navigation information were not established. It was determined that the pilot who was a senior pilot in the company was conducting training to allow a First Officer to be promoted to Captain. It was possible that while concentrating on the training task the Captain allowed his attention to be diverted from the operation of the aircraft.

Download Final Report
[ Download PDF: 23KB]
General details
Date: 07 May 1988 Investigation status: Completed 
Time: 2015  
Location:Enroute Ballidu to 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: McDonnell Douglas Corp. 
Aircraft model: DC-10 
Aircraft registration: Unknown 
Serial number: N/K 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Bali Indonesia
Departure time:N/K
Destination:Perth WA
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