Aviation safety investigations & reports

de Havilland Canada DHC-8-102 , VH-TQT

Investigation number:
Status: Completed
Investigation completed


A de Havilland Canada DHC-8, VH-TQT, was inbound to Mildura from Melbourne and overflew a glider that was crossing from left to right. At the time, TQT was descending through 7,300 ft and the crew had made inbound and top of descent broadcasts. The aircraft, which were outside controlled airspace, passed within an estimated 30 to 60 m. VH-TQT was on the area frequency 122.1 MHz and the glider, VH-GDJ, was on the glider frequency 122.7 MHz.

AIP Australia ENR 5.5, paragraph 1.1.3, states: "Except for operations in controlled airspace, gliding operations may be conducted no-radio, or may be on frequencies 122.5MHZ, 122.7MHZ or 122.9MHZ, which have been allocated for use by gliders. Unless otherwise authorised, gliding operations in controlled airspace must be conducted using the appropriate air traffic control frequency. Radio equipped gliders at non-controlled aero-dromes will use the MBZ frequency or CTAF. Whenever possible, when operating above 5,000 ft AMSL outside a MBZ or CTAF area, glider pilots are expected to listen out on the area VHF and announce if in potential conflict."

Consequently, in the circumstances of this occurrence, the glider pilot was "expected to listen out on the area VHF" but was not required to do so.

The pilots of both aircraft advised that, from the time of sighting of the other aircraft, they had no time to take avoiding action.

Safety Action


The Chief Flying Instructor of the Sunraysia Gliding Club has liaised with the Manager Flight Safety of Southern Australia Airlines on the development of procedures to prevent a recurrence of this incident.

As a result of this and other occurrences the Bureau of Air Safety Investigation is currently investigating a safety deficiency. The deficiency relates to the appropriateness of gliders and other sports aviation aircraft not being on an area frequency when flying above 5,000 ft. Any safety output issued as a result of this analysis will be published in the Bureau's Quarterly Safety Deficiency Report.

General details
Date: 04 February 1999   Investigation status: Completed  
Time: 1603 hours ESuT    
Location   (show map): 28 km SE Mildura, Aero.    
State: Victoria   Occurrence type: Near collision  
Release date: 24 September 1999   Occurrence category: Incident  
Report status: Final   Highest injury level: None  

Aircraft 1 details

Aircraft 1 details
Aircraft manufacturer de Havilland Canada  
Aircraft model DHC-8  
Aircraft registration VH-TQT  
Serial number 349  
Type of operation Air Transport Low Capacity  
Damage to aircraft Nil  
Departure point Melbourne, VIC  
Destination Mildura, VIC  

Aircraft 2 details

Aircraft 2 details
Aircraft manufacturer Grob - Burkhart Flugzeugbau  
Aircraft model G102  
Aircraft registration VH-GDJ  
Serial number 1298  
Type of operation Gliding  
Damage to aircraft Nil  
Departure point Yamba, VIC  
Destination Balranald, NSW  
Last update 13 May 2014