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At 1526 Central Standard Time on 4 September 2012, a Bombardier DHC-8-202, registered VH-ZZJ (ZZJ), was cleared to takeoff on runway 29 at Darwin airport, Northern Territory. At 1528 and before ZZJ had commenced takeoff, an Aerospatiale AS.332L1, registered VH-LOJ (LOJ), called ready on runway 36. The Aerodrome Controller (ADC) cleared LOJ for takeoff and instructed the pilot to maintain upwind.

The pilot of ZZJ heard the transmission and, believing that there would have been a risk of a collision if he commenced takeoff, delayed his departure until after LOJ had crossed the intersection of the two runways. The action of the pilot of ZZJ to delay takeoff reduced the likelihood of a more serious incident.

Air traffic services at Darwin are provided by the Department of Defence (Defence). The Defence investigation found that an unsafe takeoff clearance had been issued to LOJ, resulting in a runway separation breakdown. Further, the ADC failed to monitor both ZZJ and LOJ during a critical phase of operation – takeoff. The actions of the pilot of ZZJ, by delaying takeoff, reduced the severity of the incident.

The pilot of ZZJ did not query the ADC’s instructions at the time and did not report the incident until two days later. The pilot of LOJ was not aware of the incident and the ADC did not recall the incident.


Aviation Short Investigation Bulletin – Issue 17

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[ Download PDF: 189KB]
General details
Date: 04 September 2012 Investigation status: Completed 
Time: 1526 CST  
Location   (show map):Darwin Airport Investigation type: Occurrence Investigation 
State: Northern Territory Occurrence type: Loss of separation 
Release date: 23 April 2013 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
Anticipated completion: 4th Quarter 2012 Highest injury level: None 
Aircraft 1 details
Aircraft manufacturer: Bombardier Inc 
Aircraft model: DHC-8 
Aircraft registration: VH-ZZJ 
Serial number: 551 
Type of operation: Aerial Work 
Damage to aircraft: Nil 
Departure point:Darwin, NT
Destination:Darwin, NT
Aircraft 2 details
Aircraft manufacturer: Aerospatiale Industries 
Aircraft model: AS332 
Aircraft registration: VH-LOJ 
Serial number: 2312 
Type of operation: Flying Training 
Sector: Helicopter 
Damage to aircraft: Nil 
Departure point:Darwin, NT
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Last update 16 November 2015