Aviation safety investigations & reports

Warning device event – Hamilton Island, Qld, VH-TNX

Investigation number:
200500654
Status: Completed
Investigation completed

Summary

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On 15 February 2005, a de Havilland Canada DHC-8-102 (Dash 8) aircraft, registered VH-TNX, was being operated on a scheduled passenger service from Hamilton Island to Cairns, Qld. The aircraft was in instrument meteorological conditions with significant turbulence reported by the pilot in command, who was the pilot flying (PF).

During the climb from Hamilton Island, the PF engaged the autopilot while manoeuvring to intercept the outbound track. During a right turn at 2,624 ft above mean sea level, the Enhanced Ground Proximity Warning System (EGPWS) bank angle advisory activated. That advisory was in the form of an aural alert to the flight crew of 'BANK ANGLE, BANK ANGLE' when a roll angle of 35 degrees was exceeded, and the aircraft was greater than 156 feet above ground level.

Recorded flight data indicated that, while the aircraft was being manually flown, the angle of right bank was increasing as the autopilot was engaged. The angle of bank momentarily reached a maximum of 34.9 degrees, which activated the EGPWS. The PF briefly disengaged and re-engaged the autopilot a number of times during the manoeuvring. That included disengaging the autopilot during a subsequent left turn that was required to make good the outbound track, before re-engaging the autopilot for the remainder of the flight.

A post-flight engineering inspection found no fault with the aircraft's number one Attitude Heading Reference System (AHRS) or with the flight guidance computer system (FGC1). However, as a precautionary measure, these systems were replaced.

Download Final Report
[Download  PDF: 142KB]
 
 
 
General details
Date: 15 February 2005   Investigation status: Completed  
Time: 0820    
Location   (show map): Hamilton Island, Aero.    
State: Queensland   Occurrence type: E/GPWS warning  
Release date: 31 July 2007   Occurrence class: Operational  
Report status: Final   Occurrence category: Incident  
  Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer de Havilland Canada  
Aircraft model DHC-8  
Aircraft registration VH-TNX  
Serial number 033  
Type of operation Air Transport Low Capacity  
Damage to aircraft Nil  
Departure point Hamilton Is, Qld  
Departure time 0820  
Destination Cairns, Qld  
Last update 16 February 2016