Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2482

b) When a target has been declared to be valid, it is interrogated unless its altitude differed from the ACAS altitude by more than 3 050 m (10 000 ft). Otherwise, its altitude is monitored using DF = 0 or DF = 4 replies, or in the absence of such replies, by interrogating once every 10 seconds to elicit a DF = 0 reply.

Source: https://magyarkozlony.hu/hivatalos-lapok/bfd0d67db9f223889f627fd618725b03526630e2/dokumentumok/d5234fd7275da04023366ab8a434989962a31bdf/letoltes