Originally Posted by
Pin Head
Thanks.
But do any indications just dissapear? So black background only,
I don't have first hand knowledge of the 737, but standard Boeing design practice is to blank displays if the digital data is lost or invalid. With analog signals, you can't tell the difference between lost and valid but zero, so they will still display zero.
Next time you do an engine start, before you do anything look at the engine displays - digital inputs only from the FADEC will be blank until the FADEC is powered, anything that is analog (or has an analog backup - rotor speeds) will read zero. That's pretty much what you'll see if the engine decides to go it's own way
