AirNav Indonesia, which operates the Jakarta Area Control Centre, reported that Jakarta Centre then cleared Flight 8501 to flight level 340 at 06:14, but no response was received; other aircraft in the vicinity were asked to contact Flight 8501, but also did not receive a response.
AirNav Indonesia, que opera o centro de control da área de Iacarta, informou que o centro autorizou entón ao voo Flight 8501 voar ao nivel 340 ás 06:14, pero non recibiu ningunha resposta; solicitouselles a outros avións na zona que contactasen co voo 8501, pero estes tampouco obtiveron resposta.