JO 7110.65 5-14-5

Two‐letter ICAO designators or three‐letter designators, as appropriate, must be used unless program limitations dictate the use of a single letter alpha prefix.

Use of the inhibit/select functions to remove displayed information no longer required must be in accordance with local directives, which should ensure maximum required use of the equipment.

Information displayed must be in accordance with national orders and specified in local directives.

During outages of the ASR that supports an ASDE system where MLAT is inoperative or is not present, the tower position(s) responsible for aircraft on approach to the airport must enable the ADS-B indicator on the tower display workstation(s) (TDW(s)). NOTE-

The ADS-B indicator will only display if the TDW is operating in Fused Display Mode.

REFERENCE-

FAA Order JO 7110.65, Para 3-1-9 , Use of Tower Radar Displays.