Q-CODE 4th & 5th Letters for
Instrument and Microwave Landing



ILS (IC)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
CTON TEST, DO NOT USE
LGOPERATING WITHOUT IDENTIFICATION
LSSUBJECT TO INTERRUPTION
TTHAZARD
XX
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DME ASSOCIATED WITH ILS (ID)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CHCHANGED
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
CTON TEST, DO NOT USE
LGOPERATING WITHOUT IDENTIFICATION
LSSUBJECT TO INTERRUPTION
LTLIMITED TO
TTHAZARD
XX
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GLIDE PATH (ILS) (IG)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
CTON TEST, DO NOT USE
LGOPERATING WITHOUT IDENTIFICATION
LSSUBJECT TO INTERRUPTION
TTHAZARD
XX
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INNER MARKER (ILS) (II)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CMDISPLACED
CSINSTALLED
CTON TEST, DO NOT USE
TTHAZARD
XX
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LOCALIZER (ILS) (IL)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
CTON TEST, DO NOT USE
LGOPERATING WITHOUT IDENTIFICATION
LSSUBJECT TO INTERRUPTION
TTHAZARD
XX
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MIDDLE MARKER (ILS) (IM)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CMDISPLACED
CSINSTALLED
CTON TEST, DO NOT USE
TTHAZARD
XX
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LOCALIZER (IN)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
CTON TEST, DO NOT USE
LGOPERATING WITHOUT IDENTIFICATION
LSSUBJECT TO INTERRUPTION
TTHAZARD
XX
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OUTER MARKER (ILS) (IO)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CMDISPLACED
CSINSTALLED
CTON TEST, DO NOT USE
TTHAZARD
XX
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ILS CATEGORY I (IS)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CSINSTALLED
CTON TEST, DO NOT USE
TTHAZARD
XX
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ILS CATEGORY II (IT)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AUNOT AVAILABLE
AWCOMPLETELY WITHDRAWN
CGDOWNGRADED TO
CSINSTALLED
CTON TEST, DO NOT USE
TTHAZARD
XX
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ILS CATEGORY III (IU)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AUNOT AVAILABLE
AWCOMPLETELY WITHDRAWN
CGDOWNGRADED TO
CSINSTALLED
CTON TEST, DO NOT USE
TTHAZARD
XX
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MLS (IW)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
AHHOURS OF SERVICE ARE
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CGDOWNGRADED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CSINSTALLED
CTON TEST, DO NOT USE
LGOPERATING WITHOUT IDENTIFICATION
LSSUBJECT TO INTERRUPTION
TTHAZARD
XX
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LOCATOR, OUTER, (ILS) (IX)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CMDISPLACED
CSINSTALLED
CTON TEST, DO NOT USE
LGOPERATING WITHOUT IDENTIFICATION
LSSUBJECT TO INTERRUPTION
LTLIMITED TO
TTHAZARD
XX
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LOCATOR, MIDDLE (ILS) (IY)
AGOPERATING BUT GROUND CHECKED ONLY, AWAITING FLIGHT CHECK
ASUNSERVICEABLE
AWCOMPLETELY WITHDRAWN
CFFREQUENCY CHANGED TO
CIIDENTIFICATION OR RADIO CALL SIGN CHANGED TO
CMDISPLACED
CSINSTALLED
CTON TEST, DO NOT USE
LGOPERATING WITHOUT IDENTIFICATION
LSSUBJECT TO INTERRUPTION
LTLIMITED TO
TTHAZARD
XX
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FIRING RANGE (GM)
CAACTIVATED
CDDEACTIVATED
XX
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