http://www.eurocontrol.int/airspace/...low%20res).pdf
Si tratta di un volantino informativo pubblicato quando e' entrato in vigore l' Amendment No.5 alle PANS-ATM il 22 Novembre 2007.
C'e' un paragrafo intitolato "Level Restrictions".
1.1 There was a potential for unintended level deviations due to flight crews and controllers interpreting the continued validity of level restrictions in SIDs and STARs differently. To ensure an unambiguous understanding of PANS-ATM provisions pertaining to the validity/ applicability of level restrictions, new procedures were developed.
1.2 In all cases, level restrictions issued by ATC in air-ground communications shall be repeated by ATC
in conjunction with subsequent level clearances in order to remain in effect.
Example of phraseology when ATC issued level restrictions remain in effect
- First transmission
(call sign) CLIMB TO FL 90 CROSS ALPHA FL 70 OR BELOW
- Second transmission
(call sign) CLIMB TO FL 210 CROSS ALPHA FL 70 OR BELOW
Example of phraseology when ATC issued level restrictions are cancelled
- First transmission (including level restriction)
(call sign) CLIMB TO FL 90 CROSS ALPHA FL 70 OR BELOW
- Second transmission (level restriction cancelled)
(call sign) CLIMB TO FL 210