COST INDEX

Question 1

Define the term “Cost Index”

Answer 1

The Cost Index is the ratio of the time-related cost of an airplane operation to the cost of fuel

Time Costs/Fuel Costs

Question 2

What is the result of entering a Cost Index = 0?

Answer 2

Entering zero for the Cost Index results in maximum range airspeed and minimum trip fuel. This speed schedule ignores the cost of time

Question 3

What is the result of entering a Cost Index = 200?

Answer 3

When the maximum value for Cost Index is entered the FMC uses a minimum time speed schedule. This speed schedule calls for maximum flight envelope speeds, and ignores the cost of fuel

Question 4

When should a low Cost Index be used?

Answer 4

A low Cost Index should be used when fuel costs are high compared to other operating costs

Question 5

What does the FMC use the entered Cost Index for?

Answer 5

Uses it to calculate (ECON) climb, cruise and descent speeds

Question 6

What is the Cost Index selectable range on the B777?

Answer 6

0 - 9999

Question 7

What is the range of Cost Index to be used for Cathay operations?

Answer 7

0-250