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An INCERFA (uncertainty) phase is required to be declared when there is concern about the safety of an aircraft or its occupants when communication is not received, or the aircraft fails to arrive within 30 minutes of a prescribed time. The ALERFA (alert phase) is required to be declared when there is apprehension about the safety of an aircraft and its occupants when communication is not received or the aircraft fails to arrive within 60 minutes of a prescribed time. The National Transportation Safety Committee (NTSC) recommends that Angkasa Pura I review its standard procedures to provide an adequate assurance that alternative methods of positive identification and assessing if an aircraft is in distress, when radar track is lost, are promulgated to controllers. The standard procedures should ensure that the ICAO requirements for the declaration of INCERFA and ALERFA are met.