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The PA-44 aircraft was cleared to take-off and given a clearance which included the instructions to maintain runway heading and to call Adelaide Approach airborne. At about the same time, the TB20 was approaching Adelaide at 2,000 feet from Parafield to conduct a practice Adelaide/Parafield non-directional beacon (NDB) approach, which uses the Adelaide NDB. The TB20 pilot was cleared to conduct the NDB approach. The PA-44 did not commence its take-off run until about 110 seconds after lining up and being issued with the clearance. During this period, Adelaide Approach East issued a restriction of 2,000 feet for the PA-44, which Tower passed on to the pilot. Once the PA-44 became airborne, Tower advised Approach East that Tower was able to co-ordinate the separation between both aircraft. Approach East then directed Tower to amend the PA-44 clearance to direct to Port Stanvac at 2,000 feet. Tower could not raise the PA-44 as the pilot had changed to Approach radio frequency as instructed. Approach East then reported that he had issued the revised clearance to the PA-44 pilot. Almost a minute passed before Tower advised Approach East that a conflict was rapidly developing between the PA-44 and the TB20. The TB20 pilot, on the outbound leg of the NDB, reported sighting the PA-44 at a distance of about 30 metres, level, on his right and tracking from right to left.

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General details
Date: 17 April 1990 Investigation status: Completed 
Time: 1454  
Location:Adelaide Investigation type: Occurrence Investigation 
State: South Australia  
Release date: 03 June 1991  
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
Aircraft 1 details
Aircraft manufacturer: S.O.C.A.T.A.-Groupe Aerospatiale 
Aircraft model: TB 
Aircraft registration: VH-JTL 
Serial number: 423 
Type of operation: Private 
Damage to aircraft: Nil 
Departure point:Parafield
Departure time:N/K
Aircraft 2 details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: PA-44 
Aircraft registration: VH-KFO 
Serial number: 447995208 
Type of operation: Charter 
Damage to aircraft: Nil 
Departure point:Adelaide SA
Departure time:0
Destination:Port Stanvac SA
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