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On 4 November 2007, a Boeing Company 777-2D7 (777) aircraft, registered HS-TJW, was being operated on a scheduled passenger service from Bangkok, Thailand to Melbourne, Vic. with 17 crew and 277 passengers on board. During the conduct of a non-directional beacon (NDB) non-precision approach to runway 16 at Melbourne, the crew descended the aircraft below a segment minimum safe altitude. Soon after, the crew received two enhanced ground proximity warning system cautions. At that time, the crew became visual with the ground below and the Melbourne aerodrome controller observed the aircraft 'unusually low for an aircraft'. The crew levelled the aircraft and made a visual approach and landed, on runway 16.

The investigation found that the aircraft had descended below a critical altitude whilst carrying out an NDB approach and that the crew did not monitor the aircraft's progress correctly during the NDB approach.

The aircraft operator had known about the difficulties in flying approaches without constant angle approach paths and was in the process of training flight crews on procedures specific to NDB approaches when the incident occurred. In October 2007, the operator introduced a training program to instruct pilots on a new method to conduct those approaches. At the time of the incident, the pilots of the 777 had not undergone that training.

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Download Preliminary Report
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Preliminary report released 21 January 2008

On 4 November 2007, a Boeing Company 777-2D7 aircraft, registered HS-TJW, was being operated on a scheduled passenger service from Bangkok, Thailand, to Melbourne, Vic, with 17 crew and 277 passengers on board. During a non-directional beacon (NDB) non-precision approach to runway 16 at Melbourne Airport, the aircraft descended below the segment minimum safe altitude at 6.8 distance measuring equipment (DME, a measure in nautical miles). Soon after, the crew received two enhanced ground proximity warning system (EGPWS) cautions. The crew then levelled the aircraft and conducted a visual approach and landing on runway 16.

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General details
Date: 04 November 2007 Investigation status: Completed 
Time: 1309 ESuT  
Location:Melbourne Aerodrome Investigation type: Occurrence Investigation 
State: Victoria Occurrence type: E/GPWS warning 
Release date: 29 June 2009 Occurrence class: Operational 
Report status: Final Occurrence category: Serious Incident 
 Highest injury level: None 
 
Aircraft details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 777 
Aircraft registration: HS-TJW 
Serial number: 34591 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Bangkok, Thailand
Departure time:Unknown
Destination:Melbourne, Victoria
Crew details
RoleClass of licenceHours on typeHours total
Pilot-in-CommandUnknown
 
 
 
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Last update 14 November 2018