On 26 May 1971 Qantas received a call from a "Mr. Brown" claiming that there was a bomb planted on a Hong Kong-bound jet and demanding $500,000 in unmarked $20 notes.
Tanggal 26 Mei 1971, Qantas menerima panggilan telepon dari "Mr. Brown" yang mengaku terdapat bom pada jet-nya di Hong Kong dan ia meminta $500.000 dalam pecahan $20.