Aviation safety investigations & reports

Consolidated Aeronauticas Inc. LA4, VH-LAK, Admiralty Gulf (120 km West Kalumburu) WA, 11 August 1990

Investigation number:
Status: Completed
Investigation completed


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The sea state for takeoff was moderate with a 35 centimetre chop. As the aircraft approached 40 knots, it struck a wave and bounced into the air. When the aircraft settled back onto the water it was yawed to the left and this caused it to slide sideways into another wave. The engine and its support pylon broke off at the fuselage. The aircraft sank shortly after coming to a stop. All occupants evacuated successfully. The pilot reported that the yaw was probably induced when the left hand float entered a wave. He was unable to realign the aircraft before it collided with the second wave. The force of the impact although it did not feel severe, caused the engine and pylon to break off. The rear seat passenger seated on the left hand side, was injured when the sash seat belt anchor point was torn from the aircraft. The sash seat belt upper anchor points, are also the anchor point for the engine pod bracing wires. As the engine pod and support collapsed to the right, the left hand bracing wire and anchor block were pulled from the fuselage, tensioning the left sash belt and pulling the passenger's head into the fuselage structure.


The Bureau conducted an examination of the seat belt anchor point failure.

1. It is recommended that the Manufacturer redesign the seat belt anchor point so that it is separate from the engine pod bracing wire anchor point.

Download Final Report
[Download  PDF: 22KB]
General details
Date: 11 August 1990   Investigation status: Completed  
Time: 1500    
Location: Admiralty Gulf (120 km West Kalumburu)    
State: Western Australia   Occurrence type: Loss of control  
Release date: 10 October 1990   Occurrence category: Accident  
Report status: Final   Highest injury level: Minor  

Aircraft details

Aircraft details
Aircraft manufacturer Lake A/C Div. Of Consolidated Aeronautics Inc.  
Aircraft model LA-250  
Aircraft registration VH-LAK  
Serial number 54  
Type of operation Private  
Damage to aircraft Substantial  
Departure point Admiralty Gulf WA  
Departure time N/A  
Destination Drysdale Station WA