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An airline has 365 planes. Each plane requires routine preventative maintenance for which it is taken out of service and sent to airline's maintenance facility for 5 days. 40 percent of the planes require 2 routine preventative maintenance per year, and 60 percent of planes require 4 routine preventative maintenance per year.

What is the average per year flow rate of planes to the maintenance facility?

a. 1460 planes/year
b. 730 planes/year
c. 1095 planes/year
d. 1168 planes/year

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Answer:

D. 1168 planes/year

Explanation: Flow rate is a term used to describe the amount of a material or a particle or an equipment or a machine that enters into a given place or system in a given period of time.

The average flow rate per year of the planes into the maintenance facility is calculated as follows

Number of planes requiring 2times yearly maintenance is 40% which

is equal to (40÷100)*365planes=146planes.

The number of planes requiring 4times routine maintenance is equal to 60% which is equal to (60÷100)*365planes=219planes.

THE FLOW RATE FOR THOSE REQUIRING TWO TIMES ROUTINE MAINTENANCE WILL BE 146PLANES*2=292 FLOW RATE.

THE FLOW RATE FOR THOSE REQUIRING FOUR TIMES ROUTINE MAINTENANCE WILL BE 219PLANES*4=876PLANES

TOTAL AVERAGE FLOW RATE PER YEAR WILL BE EQUAL TO 292PLANES + 876PLANES=1168PLANES PER YEAR.

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