Aviation safety investigations & reports

Icing event - 50 km SW Canberra, 4 July 2007, VH-VEG, Beech Aircraft Corp B58

Investigation number:
AO-2007-019
Status: Completed
Investigation completed

Summary

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On 4 July 2007, the pilot of a Beech Aircraft Corporation B58 (Baron), registered VH-VEG, was conducting a charter flight in accordance with the instrument flight rules from Sydney, NSW to Shepparton, Vic. At about 1415 Eastern Standard Time, the pilot departed Sydney Airport with one passenger on board. The flight was planned via overhead Canberra, ACT and Albury, NSW. The weather forecasts obtained by the pilot indicated that in the Canberra area the freezing level would be about 6,000 ft above mean sea level (AMSL) and that broken cumulus or stratocumulus cloud could be expected to extend between 5,000 and 10,000 ft with moderate icing in cloud. The aircraft was not equipped for flight into icing conditions.

The pilot climbed the aircraft to the planned cruise altitude of 10,000 ft AMSL and was generally clear of cloud until over Canberra at 1532. At about 50 km to the south-west of Canberra the aircraft entered cloud with high moisture content at a temperature below 0 degrees C, resulting in the rapid accumulation of clear ice on the airframe. The pilot continued on track, but the build-up of ice eventually forced the pilot to descend below 7,500 ft, the published lowest safe altitude for the route. After maintaining 7,100 ft in cloud for a short time the pilot was cleared to descend to 4,900 ft. The pilot became visual and was able to descend further and to dislodge the ice.

The investigation found that the pilot was inexperienced operating in conditions conducive to icing and had not assimilated the guidance provided by the operator and the aircraft manufacturer.

While on this occasion the aircraft did not get very close to terrain, the circumstances of the occurrence are a salutary reminder of the hazard that winter weather in southern Australia can present to pilots of aircraft not equipped for flight in icing conditions.

Download Final Report
[Download  PDF: 2.06MB]
 
 
 
General details
Date: 04 July 2007   Investigation status: Completed  
Time: 1600 EST   Investigation level: Complex - click for an explanation of investigation levels  
Location   (show map): 65nm NE Albury    
State: New South Wales   Occurrence type: Icing  
Release date: 30 April 2008   Occurrence class: Environment  
Report status: Final   Occurrence category: Serious Incident  
  Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Beech Aircraft Corp  
Aircraft model 58  
Aircraft registration VH-VEG  
Serial number TH-822  
Type of operation Charter  
Damage to aircraft Nil  
Departure point Sydney, NSW  
Destination Shepparton, Vic.  
Last update 14 November 2018