A Notice to Airmen, a.k.a. NOTAM, is a notice filed with an aviation authority to alert aircraft pilots of potential hazards along a flight route or at a location that could affect the safety of the flight.
REFERENCE TO THE PANS-ATM DOC 4444,THE FLIGHT CREW EXECUTING RNAV SIDS FOR ISTANBUL ATATURK AIRPORT SHALL BE AWARE OF THE REQUIREMENT AS STATED BELOW:
CLIMB CLEAREANCE ABOVE LEVELS SPECIFIED IN A SID:
"WHEN A DEPARTING AIRCRAFT ON A SID IS CLEARED TO CLIMB TO A LEVEL HIGHER THAN THE INITIALLY CLEARED LEVEL OR THE LEVEL(S) SPECIFIED IN A SID,THE AIRCRAFT SHALL FOLLOW THE PUBLISHED VERTICAL PROFILE OF A SID, UNLESS SUCH RESTRICTIONS ARE EXPLICITLY CANCELLED BY ATC."
THE CANCELATION OF THE LEVEL RESTRICTIONS DEPICTED ON THE SIDS WILL BE SUBJECT TO THE ATC CLEARANCE BY THE PHRASE OPEN CLIMB TO ALT/FL.