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During the procedure turn at the end of a spray run the engine power failed. During the ensueing forced landing the pilot had to overpitch the rotor to avoid power lines. The helicopter landed heavily fracturing the tail boom, damaging the main rotor blades, and collapsing the skids. Inspection of the engine disclosed that the left exhaust pipe had fractured inside the carburettor heat shroud. The exhaust gases were then ingested by the engine with consequent total loss of power. The exhaust pipe fracture was caused by fatigue occasioned by the unsupported nature of the installation. The shroud would have masked the fracture growth, which was not in evidence at the last inspection some 40 hours prior to failure. Significant Factors: 1. The engine power failed due to a fractured exhaust pipe. 2. The pilot was forced to overpitch to avoid obstructions. 3. The helicopter landed heavily.
Download Final Report
[ Download PDF: 12KB]
General details
Date: 23 January 1993 Investigation status: Completed 
Time: 14:00 ESuT  
 Investigation type: Occurrence Investigation 
Release date: 10 June 1993 Occurrence class: Technical 
Report status: Final Occurrence category: Accident 
Aircraft details
Aircraft manufacturer: Hiller Aviation 
Aircraft model: UH-12E 
Aircraft registration: VH-AGK 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:Nabageena TAS
Destination:Nabageena TAS
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Last update 23 July 2015