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On 26 September 2011 at 1151 Eastern Standard Time, the crew of an Airbus A321 (Airbus) aircraft, registered VH-VWW, received on the aircraft's traffic alert and collision avoidance system (TCAS) a traffic advisory (TA) alert, for an aircraft that was approaching from their front-right position at 2 NM (3.7 km) at 2,700 ft. The Airbus was maintaining 3,000 ft on an ARBEY standard terminal arrival route to runway 34 Left at Melbourne Airport, Victoria and was in Class C controlled airspace. The upper limit of non-controlled Class G airspace in the area was 2,500 ft.

It was later found that the pilot of the other aircraft a Piper PA-28-181 Archer, registered VH-TXD, had incorrectly set the aircraft's altimeter barometric pressure subscale setting, resulting in the aircraft entering controlled airspace without a clearance and a violation of controlled airspace occurring.

The occurrence was quickly resolved due to the traffic alert from the Airbus A321 aircraft's TCAS and the subsequent response from the flight crew.

This incident acts as a reminder to pilots of the importance to cross-check cockpit settings before flight.

Download Final report
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General details
Date: 26 September 2011 Investigation status: Completed 
Time: 1152 EST  
Location   (show map):near Altona Investigation type: Occurrence Investigation 
State: Victoria Occurrence type: Loss of separation 
Release date: 14 March 2012 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
 
Aircraft 1 details
Aircraft manufacturer: Airbus Industrie 
Aircraft model: A321 
Aircraft registration: VH-VWW 
Serial number: 3916 
Operator: Jetstar 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Darwin, NT
Destination:Melbourne, Vic
Aircraft 2 details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: PA-28 
Aircraft registration: VH-TXD 
Serial number: 2843577 
Type of operation: Private 
Damage to aircraft: Nil 
 
 
 
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Last update 01 March 2016