Abstract :
Ideally, a flight has the right balance to calculate operational costs. By reducing
operating costs, the company will benefit. One way to reduce operational costs is to
reduce the amount of fuel consumption by knowing the value of the cost index. Cost index
is a comparison between cost time and fuel cost. The amount of the cost index of an
aircraft varies from one aircraft to another aircraft.
For Boeing 737 aircraft the ideal cost index value is in the range of 0-500
according to the recommendations of the Boeing Company. The cost index value is
entered into the MCDU and the FMC will calculate the speed on the aircraft. If the right
cost index value is obtained, it is hoped that the airline will get the maximum profit.
To find out the cost index value, it must first be known the time cost and fuel cost
value of the flight. In this study on B737-900 ER aircraft, it is known that the cost index
value is 125 and on the B737-800 NG aircraft the cost index value is 121.