Aviation safety investigations & reports

In-flight shutdown, VH-QOA, 84 km N of Lockhart River Aerodrome, Queensland, 20 June 2008

Investigation number:
Status: Completed
Investigation completed


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On 20 June 2008, a Bombardier DHC-8-402 aircraft, registered VH-QOA, with four crew and 59 passengers on board, departed Horn Island for Cairns, Queensland on a scheduled passenger flight. During the climb, the right propeller electronic control (PEC) caution light illuminated with an associated right propeller overspeed warning. The right engine was shutdown in accordance with the operator's Quick Reference Handbook and the crew diverted the aircraft to Weipa.

During the approach to Weipa, the aircraft's right hydraulic system failed requiring the landing gear to be manually lowered. Due to the loss of hydraulic system services, the nosewheel steering was not available and the aircraft required ground crew assistance to tow the aircraft to the parking area.

As a result of a number of similar occurrences experienced by international and domestic operators , the propeller manufacturer developed a number of software changes which, when introduced, will allow the continued operation of an engine by the crew after the primary propeller speed signal is lost. The aircraft operator intends incorporating that modification into its DHC-8 fleet once training and other resource considerations are satisfied.

In addition, the aircraft manufacturer has incorporated a modification in the aircraft to ensure that the power transfer unit is started before the loss of the No. 2 hydraulic system pressure.

Download Final Report
[Download  PDF: 251KB]
General details
Date: 20 June 2008   Investigation status: Completed  
Time: 1205 EST   Investigation level: Systemic - click for an explanation of investigation levels  
Location   (show map): Lockhart River    
State: Queensland   Occurrence type: Propeller/rotor malfunction  
Release date: 25 June 2010   Occurrence category: Serious Incident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Bombardier Inc  
Aircraft model DHC-8  
Aircraft registration VH-QOA  
Serial number 4112  
Type of operation Air Transport High Capacity  
Departure point Horn Island Qld  
Destination Cairns Qld  
Last update 03 April 2020