This requirement was implemented due to changes in procedures for VFR flights in airspace Classes C and D (Details see: Austro Control GmbH - Revised procedures for VFR flights in airspace Classes C and D).
For further information please consult AIP GEN 1.5 (2.1.7) as well as NOTAM A2927/23 and NOTAM A2928/23.
AIP
WEF 28 DEC 2023: GEN 1.5 (austrocontrol.at)
WEF 29 DEC 2023: GEN 1.5 (austrocontrol.at)
NOTAMs
If you have any questions, please contact our experts: info@austrocontrol.at
Wed 20.12.2023