"USED WITH DISPLAY 6610-01-153-1807 TO MAKE UP THE VSD-DU; REPLACES PART NUMBER 4014805-922, NSN 6610-01-261-0316; THIS ITEM HAS A CONVERSION WHICH CHANGED THE DISPLAY PRESENTATION BY DELETING THE PREVIOUS ILS BOX AND REPLACING IT WITH A LOCALIZER ADN GLIDE SLOPE RAW DATA DEVIATION SCALE; A NEW ILS/AILA MODE IS CREATED AND SELECTED WITH A NEW MODE CODE SWITCH POSITION; THE BEZEL LOWER LIGHT PANEL ASSEMBLY WILL HAVE THE ILS/AILA LEGEND ENGRAVED ON IT WITH THE A NEW NAMEPLATE ATTACKED TO THE DU TO IDENTIFY THE -923 CONVERSION"