Abstract :
Air Turbine Starter (ATS) is a component that has an important role in the
aircraft operating system for aircraft starters. The Air Turbine Starter component
of the Boeing 737-900ER has a type of On Condition and Condition Monitoring
(OCCM) maintenance program, where maintenance flight hours need to be
monitored through unscheduled removal. The Covid-19 pandemic that occurred
in Indonesia influenced changes in operational mechanisms and aircraft
maintenance, such as aircraft utilization per day and aircraft routes. The purpose
of this resource is to determine the average serviceable age and calculate the
inventory of Air Turbine Starter components before and when the Covid-19
pandemic.
The research method used is the Weibull distribution to find the Mean
Time Between Unscheduled Removal (MTBUR). Inventories of Air Turbine
Starter (ATS) components before and during the Covid-19 are calculated using
the Poisson Distribution method. Then analyzed the factors that affect the amount
of component inventory needed before and during the Covid-19 pandemic.
The average serviceable age of ATS components before the Covid-19
pandemic was 20964 hours and during the Covid-19 pandemic it was 24640
hours. The inventories of ATS components needed before the Covid-19 pandemic
were 8 components, while during the pandemic Covid-19 there were 9
components. This difference is influenced by the TAT during the pandemic which
took almost twice as long as before the pandemic. The ATS component
maintenance program that is OCCM also affects unscheduled removal from
inspections based on whichever comes first between FH, FC, or calendar dates.