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While making a turn shortly after commencing to taxy at Brisbane, the captain thought the nosewheel steering' felt slightly stiffer than usual. However, during the subsequent taxying and flapless take-off at Brisbane and the undercarriage extension at Maryborough there were no indications of any abnormality in either the nosewheel steering or undercarriage systems. An approach was made to land on Runway 17 at Maryborough with a light crosswind from the left. The aircraft touched down lightly on the main wheels about 1,200 feet fist the threshold. The nosewheel was lowered onto the runway and ground fine pitch was selected. Almost mediately severe nosewheel shimmy was noticed, accompanied by vibration and noise. The captain applied back pressure to the control column, in order to lighten the weight on the nosewheel, and ordered the first officer to carry out the impact drill. The severe vibration continued, and then, at 3,100 feet beyond the threshold, the downlock mounting lug on the nose undercarriage assembly failed allowing the assembly to pivot rearwards beyond its normal "DOWN" position. The captain applied the brakes as the aircraft continued rolling with the nosewheel pivot bracket and wheel lever fork-end skidding along the runway surface. The aircraft came to a halt 550 feet short of the southern end of the runway. Investigation showed that the nosewheel tyre was in a substantially deflated condition at touchdown and that the tube subsequently became mutilated and bunched in one section of the tyre resulting in an unbalanced nosewheel condition which generated fore and aft loads which were at or near the natural frequency of the nose undercarriage assembly.

Download Final Report
[ Download PDF: 107KB]
 
 
 
 
General details
Date: 07 October 1969 Investigation status: Completed 
Time: 1302 EST Investigation type: Occurrence Investigation 
Location:Maryborough  
State: Queensland Occurrence class: Mechanical 
Release date: 08 May 1972 Occurrence category: Accident 
Report status: Final Highest injury level: None 
 
Aircraft details
Aircraft manufacturer: Fokker B.V. 
Aircraft model: F27 
Aircraft registration: VH-FNR 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Substantial 
Departure point:Brisbane
Departure time:1220
Destination:Maryborough
 
 
 
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Last update 01 April 2011