Amendment to ICAO Doc 4444: PANS-ATM

• There was a potential for unintended level deviations due to flight crews and controllers interpreting the continued validity of level restrictions differently.
• To ensure an unambiguous understanding of the PANS-ATM provisions pertaining to the validity/applicability of level restrictions, new procedures (ref.: PANS-ATM paragraphs 6.3.2.4, 6.5.2.4, 11.4.2.6.2.5 and Chapter 12) were developed.