Abstract :
As time goes by the use or operation of aircraft, every system or component
of the aircraft experiences a decrease in performance, one of which is experiencing
failure. Beta system is a system that functions to regulate the amount of oil flow
that enters the propeller piston section, where as a regulator of the size of the angle
on the propeller. The existence of several types of failures that occurred in the beta
system resulted in the beta system having to be replaced even before reaching its
2500 flight hour limit.
This study aims to determine the failure that often occurs, the causes of
failure, and the probability of failure of the beta system of the Grob G 120 TP-A
aircraft using the FTA (Fault Tree Analysis) method. The analysis is done by
defining the failure and determining the boundary conditions of the beta system,
describing the fault tree model, identifying the minimum cut set of the fault tree,
conducting a qualitative analysis of the fault tree, and performing a quantitative
analysis of the fault tree.
The results of this study show that the failure that often occurs in the beta
system of the Grob G 120 TP-A aircraft is the occurrence of oil temperature high
over 84 ?, in qualitative analysis there are 12 causes of failure in the beta system,
and based on quantitative analysis, the probability of beta system failure is 0.76363.