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Old 5th Jan 2018, 18:13
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barrichello72
 
Join Date: Sep 2005
Location: italy
Posts: 42
B737 nb electronic engine computer

Hi folks
I do have a question about the functioning of the EEC on the 737-800
As far as i know the EEC when operated in the normal mode compares actual thrust to commanded thrust - either from the fmc or manually selected - and adjusts the fuel flow to achieve the commanded thrust based on ambient conditions and bleed air demand. Those ambient conditions include but are not limited to ambient pressure supplied by the T sensor while on the ground and by the ADIRU once airborne, and mach number derived by integrating static ambient pressure with total air pressure and TAT from the ADIRU.
Now my questions are: why does it need to know the Mach number and how can it derive the Mach number from the air pressure considering that the mach number is a function of the temperature?

Many thanks
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