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A domestic Boeing 767 was inbound to the holding pattern at Cullerin and the crew had been issued a requirement to reach their assigned level of FL 290 before entering the pattern. The crew of a Boeing 747 already established in the Cullerin pattern observed the inbound aircraft descending through its assigned level and alerted ATC. The descending aircraft was visually sighted and was displayed as traffic on the TCAS. The pilot of the descending B 767 indicated that the autopilot had not captured the assigned level as programmed. The pilot indicated that this was possibly complicated by late amendments to the holding instruction. The crew intervened when it became apparent that the autopilot had not captured the assigned level, but not before the aircraft had descended approximately 400 ft through the assigned level. The controller indicated that 1,000 ft vertical separation between the two aircraft was quickly re-established and the aircraft were horizontally separated by 3 - 4 NM.
Download Final Report
[ Download PDF: 14KB]
 
 
 
 
General details
Date: 10 December 1997 Investigation status: Completed 
Time: 8:40 ESuT Investigation type: Occurrence Investigation 
 Occurrence type:Loss of separation 
 Occurrence class: Airspace 
Release date: 15 April 1998 Occurrence category: Incident 
Report status: Final  
 
Aircraft 1 details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 747-438 
Aircraft registration: VH-OJA 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Melbourne Vic.
Destination:Sydney NSW
Aircraft 2 details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 767-277 
Aircraft registration: VH-RME 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Melbourne Vic.
Destination:Sydney NSW
 
 
 
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Last update 28 October 2014