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Frequently Asked Questions

Software Control Number

What is the Software Control Number (SCN) of my Universal Avionics equipment?

The SCN will be visible on the initialization page of the Control Display Unit (CDU), in the lower right hand corner of the display.  You may also access this by selecting “DATA”, “MAINT” (LSK 5R), S/W VERS (LSK 5L).  It is also marked on the data plate of the Navigation Computer Unit (NCU).