CFM56-7B VSV manual closing

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CFM56-7B VSV manual closing

Postby CFM567B » 14 Jan 2017, 15:24

Hi all
I have an urgent question if you could help
we're now make an CFM56-7B engine preservation but in the task he mentioned SPL-2178 fuel pump to close the VSV
we don't have such tool now ,so the question

is there any other procedure closing VSV without operating the engine and without this pump?

thanks alot
:)
CFM567B
 
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Re: CFM56-7B VSV manual closing

Postby sjap » 15 Jan 2017, 15:39

If you are preserving it you must crank it on a certain moment.
If you then use the CDU to tell the a/c you are doing a engine wash, it will command the VSV's to open position once you are starting to crank it.
sjap
 
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Re: CFM56-7B VSV manual closing

Postby CFM567B » 16 Jan 2017, 23:03

Thanks for your interest ,but kindly note that due to damage of fan blade set we can't motor the engine
Also the VSV are in the open position and we want to close it

Finally is there any technical reference for this procedure
As alternate for using fuel pump?

Thanks in advance
CFM567B
 
Posts: 2
Joined: 14 Jan 2017, 15:18

Re: CFM56-7B VSV manual closing

Postby sjap » 17 Jan 2017, 11:49

Sorry i dont know of any other method. You may try to manually close the vsv actuators with disconnected hoses to relief fuel press. Just try to move both actuators by hand to the closed position.
And if you remove the damaged fan blades you are able to turn the rotor? then you are also able to cranck the engine. It is possible to cranck it without fanblades, i did it sometimes. Just remove all of them.
sjap
 
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