Lesson 16 Flashcards
What is a VOR?
A radio navigation system for aircraft to determine their position relative to the station
VOR stands for Very High Frequency Omnidirectional Range
What are the main components of VOR equipment?
- VOR station on the ground
- Antenna (shaped like a V)
- Receiver
- Indicator
- Omni-bearing selector (OBS)
- Course deviation indicator (CDI)
- To-From indicator
- Red Flag
What frequency range does a VOR operate in?
108-117.95 MHz
What does ‘Omni’ mean in the context of VOR?
‘Omni’ means all; it indicates that the station projects VHF radials in every direction.
How many radials does a VOR send out?
360 radials
What is the purpose of the course deviation indicator (CDI)?
Indicates which direction the aircraft needs to go to align with the selected radial
What does the To-From indicator show?
Indicates whether your selected course will take you to or from the station
What is the cone of confusion?
A situation where the radials become too close together and are unreliable when flying close to or directly over a VOR
What is DME?
A transponder-based device that measures slant range from an aircraft to a ground station by timing the delay of interrogation signals
What does the DME equipment on the aircraft measure?
The time it took to receive the signal to calculate the distance from the aircraft to the ground station
What is RNAV?
Area Navigation that allows aircraft to fly more directly from one location to another through predetermined waypoints
What does ATC stand for?
Air Traffic Control
What is Primary Radar?
Ground-based transmitter and receiver that emits and detects radio waves using a rotating antenna
What is Secondary Radar composed of?
- Interrogator
- Transponder
- Decoder
What are the modes of a transponder?
- Mode A: transmits 4-digit squawk code
- Mode C: transmits squawk code and altitude
- Mode S: Mode C plus allows information exchange with ATC
What does ADS-B stand for?
Automatic Dependent Surveillance - Broadcast
What is the main function of GPS?
To determine precise position anywhere in the world
What are the three segments of GPS?
- Space segment
- Control segment
- User segment
What does RAIM stand for?
Receiver Autonomous Integrity Monitoring
What is the role of WAAS?
A system that monitors and corrects errors in GPS signals, reducing GPS error to 10 feet
Fill in the blank: The VOR must be checked within the past _______ days if it is to be used for IFR flight.
30
True or False: The DME can display the height above the station instead of the distance when directly over the DME.
True
