A1178/26 NOTAMR A1171/26 Q)OIIX/QAFXX/E/////000/999/ A)OIIX B)2606081622 C)2606290830EST E)TEHRAN FIR RESUMED NORMAL OPERATION,  WHILE WEST PART OF TEHRAN FIR REMAINS CLOSED FOR OVERFLIGHTS,  DIVIDING LINE GOES THROUGH  IVIVA-RIGUT-NALBI-YZD-RERET-EGVEL-GONVA-ROVON-LUMOM,  - OVERFLIGHT OPERATION IN EAST PART OF TEHRAN FIR IS SUBJECT TO    FOLLOWING CONDITIONS:  1- ATS SURVEILLANCE SERVICE WILL BE PROVIDED ABOVE FL 285     SUBJECT TO RADAR COVERAGE,  2- INBOUND TRAFFIC SHALL CONTACT TEHRAN ACC 5 MIN PRIOR TO     FIR BOUNDARY FOR IDENTIFICATION,  3- OUTBOUND TRAFFIC SHALL ESTABLISH COMMUNICATION WITH NEXT     ACC 5 MIN PRIOR TO FIR BOUNDARY,  4- FLIGHTS SHALL HAVE OPERATIONAL ACAS,  5- LARGER SEPARATION MAY BE APPLIED WITHIN TEHRAN FIR,  6- FLIGHTS SHALL RETAIN THE LAST ASSIGNED SSR CODE,     IF CODE HAS NOT BEEN ASSIGNED, USE SQUAWK 2000 UNTIL     FURTHER INSTRUCTION BY ACC.