Aviation safety investigations & reports

Aircraft icing and incipient stall - VH-UYI, overhead Gayndah NDB, Queensland

Investigation number:
AO-2009-003
Status: Completed
Investigation completed

Summary

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On 5 November 2008 at about 1838 Eastern Standard Time1, the flight crew of a Saab Aircraft AB 340B, registered VH-UYI, identified an incipient stall while flying a holding pattern in icing conditions. The aircraft's stall warning system did not activate. The pilot in command disconnected the autopilot and recovered the aircraft from the stall. During the recovery manoeuvre, both engines exceeded their maximum continuous operating temperature for an extended period. The manufacturer's Aircraft Operating Manual stated that the Saab 340B stall warning system had an activation level designed for a clean wing only. The manufacturer has issued updated operating procedures for flight in icing conditions, designed to prevent ice build-up on the airframe.

Download Final Report
[Download  PDF: 3.07MB]
 
 
 
General details
Date: 05 November 2008   Investigation status: Completed  
Time: 1838 EST   Investigation level: Short - click for an explanation of investigation levels  
Location   (show map): Overhead Gayndah NDB    
State: Queensland   Occurrence type: Icing  
Release date: 29 June 2010   Occurrence class: Environment  
Report status: Final   Occurrence category: Serious Incident  
  Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer S.A.A.B. Aircraft Co  
Aircraft model 340  
Aircraft registration VH-UYI  
Serial number 340B-283  
Type of operation Air Transport Low Capacity  
Damage to aircraft Minor  
Departure point Moranbah, Qld  
Destination Brisbane, Qld  
Last update 14 November 2018