FDR analysis Kish Air Flight 7170

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the thrust lever of fokker 50


the fdr parameter low propeller pitch lights indicate left propeller entered ground control range 1 sec prior right propeller, yet propeller rpm parameters indicated both propellers moved simultaneously ground control range. engine, aircraft , propeller manufacturers in agreement propeller behaviour in ground control range during flight unpredictable. however, analysis of dfdr data, there general consensus propeller behaviour.


on selection of power levers ground control range, propeller pitch changes resulted in decrease of lift on wing , turbulent low speed airflow on tail plane , elevator. coupled other aerodynamic moments associated lift/drag , thrust/weight coupling, aircraft pitched down , remained in nose low attitude. aircraft commenced roll left due asymmetric drag effects of different propeller pitch angles. left propeller went full reverse whilst right propeller remained in positive pitch within ground control range.








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