Blk 4 General Navigation Flashcards
VOR
Very High Frequency (VHF) Omni Range
360 degree “radials”
VOR does not provide any distance information
DME
Distance Measuring Equipment
UHF Band. co-located with other NAVAID (VOR or ILS)
TACAN
Tactical Air Navigation
UHF Band. 360 degree “radials”. TACAN is UHF whereas VOR is a VHF. TACAN has built in DME capability. Used only by Military
VOR/DME
Both transmitters co-located and operated simultaneously. Operation is identical
VORTAC
VOR and TACAN transmitters co-located and operated simultaneously. Similar to VOR/DME except that DME signal is transmitted from the TACAN
Civilian aircraft will receive the radia signal from the VOR transmitter and the DME signal from the TACAN transmitter.
Military aircraft can receive radial signals from either transmitter depending on which frequency is selected
NDB
Non Directional Beacon
AM (Amplitude Modulated) radio band. No specific radials being transmitted.
ILS
Instrument Landing System (VHF System)
Localizer, Glide Slope, DME, Marker Beacons.
Up to 4 separate NAVAID signals working together. Each signals/components is automatically tuned when the ILS frequency is selected on the AC nag radio.
Localizer
VHF Band. Horizontal signal. Aligns the AC with the runway during final.
Glide Slope
UHF Band. Vertical signal. Guide the AC down a descent path that is CLEAR OF OBSTACLES down to the decision height for the approach.
DME
UHF Band. Same function as enroute NAVAID, simply co-located with the ILS system
Marker Beacons
Provide situational awareness during final approach. Xmit a signal straight up in an elliptical pattern. 3 different marker beacons in ILS system
Outer, Middle and Inner Marker
Outer Marker (OM)
Passing overhead the outer marker is indicated in the AC by a BLUE light w/ “O” flashing and audible Morse code
Middle Marker (MM)
Passing overhead the middle marker is indicated in the AC by an Orange light w/ “M” flashing and audible Morse code
Inner Marker (IM)
Passing overhead the inner marker is indicated in the AC by a White light w/ “I” flashing and audible Morse code