Frequently Asked Questions

Software Control Number


Can I upgrade the Software Control Number (SCN) of my Universal Avionics equipment?

Yes, depending on a couple of items that need to be checked before the upgrade can be done. First, you must consider how the Flight Manual Supplement is written in regards to the operating software that has been approved for the aircraft. SCN upgrades right of the decimal point are considered minor alterations by the FAA. Changes left of the decimal point are considered a major alteration and may require recertification of the installation.