Aviation safety investigations & reports

Collision with terrain involving Van's Aircraft RV-6, VH-TXF near Mudgee Airport, NSW on 14 September 2014

Investigation number:
Status: Completed
Investigation completed

Final Report

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What happened

On the morning of 14 September 2014, the pilot and passenger of an amateur-built Van's Aircraft RV-6, two-seat aeroplane, registered VH-TXF and operated in the ‘Experimental’ category, approached Mudgee Airport. The aircraft had departed Dubbo Airport, New South Wales about 25 minutes earlier.

The pilot approached from the north-west and conducted a non-standard circuit entry including an orbit to the south of the airport. Prior to turning onto the downwind leg of the circuit, the aeroplane descended to about 600 ft above ground level. Witnesses stated that the pilot conducted a tight left turn onto final approach at a slow speed and low height. The witnesses also recalled hearing the aeroplane’s engine ‘splutter’ and then silence during the turn, followed by a ‘rev’ followed again by silence.

The aeroplane continued its high angle of bank left turn and, at about 1053, collided with terrain about 300 m south-west and short of the runway threshold. The pilot and passenger were fatally injured and the aeroplane was substantially damaged.

What the ATSB found

The ATSB found that during the turn onto final approach to land, the aeroplane’s engine ceased operating. The aeroplane’s airspeed before the engine failure was within about 0.5 kt of the estimated stall speed during the high-bank turn. After the engine failure, it is likely the aeroplane entered an aerodynamic stall. The associated loss of control was not recovered and the aircraft continued in the turn until it collided with terrain.

The ATSB also found that the engine failure was probably due to carburettor icing. No defects were identified that would have precluded normal engine operation prior to the accident, and uncontaminated fuel was being supplied to the engine at that time. However, the environmental conditions at the time of the accident were conducive to serious carburettor icing at descent power, and the pilot-operated carburettor heat control was found in the OFF position.

Analysis of the aeroplane’s global positioning system data showed that it was common for this pilot to fly approaches at lower than recommended circuit heights and at speeds close to the aircraft’s stall speed. On the turn to final approach on the accident flight, any loss of airspeed would have left a very short time before the aeroplane reached the stall speed.

The ATSB also found that the aeroplane’s weight was higher than the design limits. However, the effect of this weight on aircraft performance was not considered to have contributed to the accident.

The aeroplane was not required to be, and was not fitted with an angle-of-attack indicator or stall warning device.

Safety message

All pilots of aircraft fitted with a carburettor are advised to check the forecast weather conditions and consider the risk of carburettor icing as a result of those conditions prior to each flight.

Although amateur-built aeroplanes operated in the Experimental category are not required to be fitted with a stall warning device, owner-pilots should consider the benefits of such devices as a last line of defence against the inadvertent approach to, or entry into an aerodynamic stall.

Accident site VH-TXF
Accident site VH-TXF


Source: ATSB


Download Final report
[Download  PDF: 1.33MB]
Alternate: [Download  DOCX: 808KB]

The occurrence


Safety analysis


Sources and submissions


General details
Date: 14 September 2014   Investigation status: Completed  
Time: 1053 EST   Investigation level: Defined - click for an explanation of investigation levels  
Location   (show map): near Mudgee Airport    
State: New South Wales   Occurrence type: Collision with terrain  
Release date: 15 January 2016   Occurrence category: Accident  
Report status: Final   Highest injury level: Fatal  

Aircraft details

Aircraft details
Aircraft manufacturer Amateur Built Aircraft  
Aircraft model Van's RV-6  
Aircraft registration VH-TXF  
Serial number 24677  
Type of operation Private  
Sector Piston  
Damage to aircraft Substantial  
Departure point Dubbo, NSW  
Destination Mudgee, NSW  
Last update 14 November 2018