Aviation safety investigations & reports

Piper PA31 Navajo, VH-ITF, Embraer EMB110-P2 Bandierante, VH-MWX, 50 km South of Ballidu WA, 4 February 1991

Investigation number:
199102620
Status: Completed
Investigation completed

Summary

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The two aircraft were on identical tracks, with the slower aircraft (VH-ITF) in front and maintaining 8000 feet. VH-MWX was faster and maintaining 10000 feet. Due to military flying activity they were unable to fly from Ballidu direct to Perth, but obtained a clearance to track via Clackline. VH-ITF obtained a clearance to enter controlled airspace (65 nautical miles from Perth) at 6000 feet, while VH-MWX was cleared to enter at 5000 feet. Although both aircraft had reported at Ballidu at the same time, the pilots were unable to see the other aircraft. VH-ITF descended to 6000 feet and the pilot of VH-MWX elected to descend to 7000 feet until he could maintain visual contact with the other aircraft. If he had not seen the other aircraft before entering controlled airspace (CTA) he intended orbitting outside CTA until separation was obtained. The pilot of VH-MWX saw the other aircraft about 13 kilometres before the airspace boundary and commenced descent to 5000 feet. He was overtaking to the left of the other aircraft and at the same altitude when VH-ITF was instructed to make a left orbit by the controller. This action was halted when the pilot of VH-MWX advised the other pilot and the controller against the turn because his own aircraft was in the way. VH-MWX subsequently descended to 5000 feet and VH-ITF was instructed to orbit to gain lateral spacing with the other aircraft. Identification of VH-MWX on radar was completed at 57 nautical miles (103 kilometres) from Perth, after the pilot had reported at 5000 feet.

Download Final Report
[Download  PDF: 23KB]
 
 
 
General details
Date: 04 February 1991   Investigation status: Completed  
Time: 856    
Location   (show map): 50 km South of Ballidu    
State: Western Australia   Occurrence type: Loss of separation  
Release date: 06 June 1991   Occurrence category: Incident  
Report status: Final   Highest injury level: None  

Aircraft 1 details

Aircraft 1 details
Aircraft manufacturer Piper Aircraft Corp  
Aircraft model PA-31  
Aircraft registration VH-ITF  
Serial number 31-7812014  
Type of operation Charter  
Damage to aircraft Nil  
Departure point Reedys Gold Mine WA  
Departure time 0732  
Destination Perth WA  

Aircraft 2 details

Aircraft 2 details
Aircraft manufacturer Embraer-Empresa Brasileira De Aeronautica  
Aircraft model EMB-110  
Aircraft registration VH-MWX  
Serial number 110-190  
Type of operation Charter  
Damage to aircraft Nil  
Departure point Reedys Gold Mine WA  
Departure time 740  
Last update 13 May 2014