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All weather landing systems (Dcnsybmc)

Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Navigation (Dcn)
            Navigational aids (Dcns)
                 Use For: Navaids; Navigation aids
                Navigational aids specific to a craft or vehicle (Dcnsy)
                    Aircraft navigational aids (Dcnsyb)
                         Use For: Aeronautical instruments
                        Landing aids (Dcnsybm)
                            All weather landing systems (Dcnsybmc)
                            Glide path systems (Dcnsybmg)
                                 Use For: Glide paths; Glide slope
                            Instrument landing systems (Dcnsybmj)
                                 Use For: Instrument approach system; Instrument landings
                            Microwave landing systems (Dcnsybmm)