Aviation safety investigations & reports

Socata MSTB20, VH-JTI, Dubbo Aerodrome NSW, 7 September 1988

Investigation number:
Status: Completed
Investigation completed


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During the pre-landing checks the right main and nosegear gave normal green light "gear-down" indications. The left maingear green light remained extinguished and the red gear warning light illuminated. The instructor took over control of the aircraft and proceeded to carry out the emergency procedures, including recycling of the landing gear selector. Selection of "gear-up" resulted in no change to the position indicators, and no audible indication of the landing gear moving up. When power was reduced, the audible warning for "gear not locked" was heard. The emergency extension procedure was then carried out but was also unsuccessful. A number of low passes were carried out under the observation of ground engineers who reported that the left gear appeared to be not fully down. Yawing and "g" manoeuvres failed to lock the gear down. During the subsequent landing roll the left maingear collapsed, the aircraft swung to the left and departed the runway. At this point the right maingear also collapsed. The failure of the normal landing gear extension system was attributed to lack of hydraulic pressure but the reason for this was not determined. The failure of the emergency landing gear system was the result of a binding downlock assembly which did not allow the lock to fully engage. The landing gear balance spring was too weak to pull the left leg overcentre. Subsequent receipt from the manufacturer of new springs of different tension is considered to have solved the problem. This accident was not the subject of an on-scene investigation.

Download Final Report
[Download  PDF: 23KB]
General details
Date: 07 September 1988   Investigation status: Completed  
Time: 1722    
Location: Dubbo Aerodrome    
State: New South Wales   Occurrence type: Wheels up landing  
Release date: 09 May 1990   Occurrence category: Accident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer S.O.C.A.T.A.-Groupe Aerospatiale  
Aircraft model TB  
Aircraft registration VH-JTI  
Serial number 379  
Type of operation Flying Training  
Damage to aircraft Substantial  
Departure point Bankstown NSW  
Departure time 1426  
Destination Dubbo NSW