Category Three B CAT IIIB – CAT IIIC Category C – -- Controlled Flight Into Terrain CFIT CVR Cockpit Recorder – DH Decision Height – DME Distance Measuring Equipment – ELT Emergency Locator Transmitter – EVS Enhanced Vision Systems – FDR Flight Data Recorder – GPS Global Positioning System – GPWS Ground Proximity Warning System – HUD Head Up Display – ILS Instrument Landing System – IFR Instrument Flight Rules – IMC - Instrument Meteorological Conditions LRNS - Navigation Systems MACH Mach Number Indicator – MEL Minimum Equipment List – MHz Megahertz – MLS Microwave Landing System – MNPS - Minimum Navigation Performance Specifications NDB Nondirectional Beacon – PBE - Protective Breathing Equipment RNAV Area Navigation – RNP Required Navigation Performance – RVR – RVSM Reduced Vertical Separation Minimum – SSR Secondary Surveillance Radar – TAWS Terrain Awareness Warning System – VFR Visual Flight Rules – VMC - Visual Meteorological Conditions VOR VHF Omnidirectional Radiorange – VSM Vertical Separation Minimum –
CAT IIIB – Category Three B CAT IIIC – Category C CFIT -- Controlled Flight Into Terrain CVR – Cockpit Recorder DH – Decision Height DME – Distance Measuring Equipment ELT – Emergency Locator Transmitter EVS – Enhanced Vision Systems FDR – Flight Data Recorder GPS – Global Positioning System GPWS – Ground Proximity Warning System HUD – Head Up Display ILS – Instrument Landing System IFR – Instrument Flight Rules IMC - Instrument Meteorological Conditions LRNS - Navigation Systems MACH – Mach Number Indicator MEL – Minimum Equipment List MHz – Megahertz MLS – Microwave Landing System MNPS - Minimum Navigation Performance Specifications NDB – Nondirectional Beacon PBE - Protective Breathing Equipment RNAV – Area Navigation RNP – Required Navigation Performance RVR – RVSM – Reduced Vertical Separation Minimum SSR – Secondary Surveillance Radar TAWS – Terrain Awareness Warning System VFR – Visual Flight Rules VMC - Visual Meteorological Conditions VOR – VHF Omnidirectional Radiorange VSM – Vertical Separation Minimum