Aviation safety investigations & reports

Cessna 421 C, VH-ANH, Darwin NT, 12 July 1989

Investigation number:
Status: Completed
Investigation completed


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During the takeoff roll, witness evidence suggested that the right mainwheel tyre had blown. The pilot requested a low pass for an inspection of the gear and it was determined that the complete right mainwheel was missing. After reducing fuel weight to a minimum by burnoff, the pilot carried out a wheels-up landing on the runway which had been foamed in advance. Subsequent on-site inspection by the Civil Aviation Authority airworthiness staff determined that four adjacent mainwheel tie bolts had failed due to under-torquing. The resulting play in the wheel halves then caused the mainwheel bearing to fail followed by the stripping of the remaining tie bolt nuts and the complete separation of the outer half of the mainwheel and the tyre. The last periodic inspection of the aircraft was completed just prior to the accident flight.

Download Final Report
[Download  PDF: 22KB]
General details
Date: 12 July 1989   Investigation status: Completed  
Time: 850    
Location: Darwin    
State: Northern Territory   Occurrence type: Wheels up landing  
Release date: 03 November 1989   Occurrence category: Accident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Cessna Aircraft Company  
Aircraft model 421  
Aircraft registration VH-ANH  
Serial number 421C0006  
Type of operation Charter  
Damage to aircraft Substantial  
Departure point Darwin NT  
Departure time 0724  
Destination Gove NT