Q-CODE 4th & 5th Letters for
Air Traffic and VOLMET Services



AUTOMATIC TERMINAL INFORMATION SERVICE (ATIS) (SA)
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AUNOT AVAILABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CSINSTALLED
TTHAZARD
XX
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ATS REPORT OFFICE (SB)
AHHOURS OF SERVICE ARE
AWCOMPLETELY WITHDRAWN
CSINSTALLED
LCCLOSED
LTLIMITED TO
TTHAZARD
XX
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AREA CONTROL CENTER (SC)
AHHOURS OF SERVICE ARE
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
LCCLOSED
LTLIMITED TO
TTHAZARD
XX
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FLIGHT INFORMATION SERVICE (SE)
AHHOURS OF SERVICE ARE
ARAVAILABLE, PRIOR PERMISSION REQUIRED
AUNOT AVAILABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
LCCLOSED
LTLIMITED TO
XX
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AERODROME FLIGHT INFORMATION SERVICE (AFIS) (SF)
AHHOURS OF SERVICE ARE
ARAVAILABLE, PRIOR PERMISSION REQUIRED
AUNOT AVAILABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
LTLIMITED TO
TTHAZARD
XX
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FLOW CONTROL CENTER (SL)
AHHOURS OF SERVICE ARE
CSINSTALLED
LCCLOSED
LTLIMITED TO
TTHAZARD
XX
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OCEANIC AREA CONTROL CENTER (SO)
AHHOURS OF SERVICE ARE
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
LCCLOSED
LTLIMITED TO
TTHAZARD
XX
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APPROACH CONTROL (SP)
AHHOURS OF SERVICE ARE
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
LCCLOSED
LTLIMITED TO
TTHAZARD
XX
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FLIGHT SERVICE STATION (SS)
AHHOURS OF SERVICE ARE
ARAVAILABLE, PRIOR PERMISSION REQUIRED
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
LCCLOSED
LTLIMITED TO
TTHAZARD
XX
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AERODROME CONTROL TOWER (ST)
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
LCCLOSED
LTLIMITED TO
TTHAZARD
XX
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UPPER AREA CONTROL CENTER (SU)
AHHOURS OF SERVICE ARE
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
LCCLOSED
LTLIMITED TO
TTHAZARD
XX
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VOLMENT BROADCAST (SV)
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
LFINTERFERENCE FROM
LSSUBJECT TO INTERRUPTION
LTLIMITED TO
XX
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UPPER ADVISORY SERVICE (SY)
AHHOURS OF SERVICE ARE
AUNOT AVAILABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
LTLIMITED TO
XX
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