Aviation safety investigations & reports

Loss of aircraft control - Ayres 2R-T34, VH-NZB, Longreach Aerodrome Qld, 25 November 2009

Investigation number:
Status: Completed
Investigation completed


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On 25 November 2009, an Ayres Corporation S2RT341 aircraft, registered VH-NZB (Figure 1), was being operated on a ferry flight from Parkes, New South Wales (NSW) to Batchelor, Northern Territory (NT), with an initial intermediate stop at Longreach, Queensland (Qld). While on final approach to Longreach, without warning, the aircraft's nose pitched upward and an aerodynamic stall resulted. The pilot, the sole occupant, regained control and the aircraft landed safely.

A subsequent engineering investigation by the aircraft's maintenance provider determined that the elevator push rods had been fitted in the reverse order during recent maintenance, thus restricting the amount of nose down elevator travel available to the pilot.

The maintenance organisation advised the ATSB that, as a result of this occurrence, it has initiated a number of safety actions, including:

  • exploring options for modifying the design of the bellcrank assembly to ensure that the push rods can only be fitted in the correct position
  • ensuring that all employees are aware of their responsibilities when conducting dual maintenance inspections on flight control systems.

Download Final Report
[Download  PDF: 1.5MB]
General details
Date: 25 November 2009   Investigation status: Completed  
Time: 1151 EST   Investigation level: Short - click for an explanation of investigation levels  
Location   (show map): Longreach Aerodrome    
State: Queensland   Occurrence type: Loss of control  
Release date: 20 April 2010   Occurrence category: Serious Incident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Ayres Corporation  
Aircraft model S2R  
Aircraft registration VH-NZB  
Serial number T34-024DC  
Type of operation Aerial Work  
Damage to aircraft Nil  
Last update 14 November 2018