VOR Flashcards
If the reference and variable signals are in-phase the associated VOR radial would be (360°, 90° , 180° , 270° , 300°)
What is the correct answer?
360° (or 000°)
The TO/FROM Flag (does, does not) change with aircraft heading
does not
List at least two indications that could be used to indicate you are passing overhead a VOR station
**CDI needle becomes increasingly sensitive as you approach
Flicker of the TO/FROM flag and a change from the TO flag to the FROM flag (and vice versa)
OFF flag briefly shown as passing directly overhead the ‘cone of silence/confusion’ of the VOR**
Pictured are several aircraft all with their OBS set to 360°. Which aircaft (A,B,C,D,E,F,G,H) would show the FROM flag on the instrument?
Select all aircraft that would show the FROM flag
A, B, C, D
The principle of operation of the VOR is based on the measurement of…
phase difference between reference and variable phase signals
Each dot on the CDI instrument indicates ____° deviation
2°
The radial that the aircraft is on is always indicated by the (tail, head) of the needle when shown on the RMI
What is the correct answer?
tail
OBS stands for ____ ____ ____
Omni Bearing Selector
The basic principle of the VOR Receiver is that it measures…
the difference in phase signal
The OBS is set to 120° and the TO flag is shown, but you soon find yourself off course by 65° and tracking 185°. You would expect the TO/FROM flag to now show (TO, FROM, OFF)
What is the correct answer?
TO
The VOR Variable Phase Signal is (directional, omni-directional)
directional
The VOR operates in the ____ band
VHF
When the OBS selector is turned it shifts the phase of the ____ signal internally
What signal is shifted internally by the aircarft receiver?
reference signal
With regard to terrian effect, rapid needle oscillations are called ____ while slow oscillations are called ____ _____
With regard to terrian effect, rapid needle oscillations are called **scalloping **while slow oscillations are called radial bending
The CDI needle is deflected left from centre, this means the selected radial is to your (left, right) and you need to turn (left, right) to regain track
What is the correct answer?
The CDI needle is deflected left from centre, this means the selected radial is to your **left **and you need to turn left to regain track
The VOR Reference Phase Signal is (directional,omni-directional)
What is the correct answer?
omni-directional
Ignoring any OBS value, when on the VOR 180° Radial the reference and variable phase signals received will be (in-phase, out-of-phase)
What is the correct answer?
out-of-phase
When drift is correctly compensated for the drift angle can be seen by comparing aircraft heading and the ____ value when the CDI is centred
comparing aircraft heading and the OBS value when the CDI is centred
Max range of VOR is deemed ____ of ____
line of sight
If you turn the OBS from 360°/000° to 280° the reference signal is shifted ____° and the signals will be (in-phase, out-of-phase) when on the 280° radial FROM the VOR
What combination gives the correct answer?
If you turn the OBS from 360°/000° to 280° the reference signal is shifted 280° and the signals will be in-phase when on the 280° radial FROM the VOR
The TO/FROM Flag (does, does not) indicate if the aircraft is flying to or from the VOR station
What is the correct answer?
**does not
(as it ignores aircraft heading)**
Pictured is two different VOR stations tuned on an RMI. Needle 1 (skinny) is tuned to VOR A and shows the aircraft is on the ____° radial while Needle 2 (fat) is tuned to VOR B and shows the aircraft is on the stations _____° radial
Pictured is two different VOR stations tuned on an RMI. Needle 1 (skinny) is tuned to VOR A and shows the aircraft is on the 240° radial while Needle 2 (fat) is tuned to VOR B and shows the aircraft is on the stations 120° radial
You are tracking outbound on the VOR 144° radial. What OBS setting should you set to provide command indications, and what would be the correct TO/FROM indication?
144° set on the OBS, FROM flag showing
Which pictured instrument represents a signal that is 180° out-of-phase?
Instrument 2
Under what conditions will the CDI needle be straight and centred on the instrument face showing no deviation?
When tracking correctly on the selected radial or its recipicol. i.e. When the signal is in-phase or 180° out-of-phase
The CDI devaition scale indicates a maximum (full dot deflection) of ____° either side of the selected radial
10°
The pictured instrument shows deviation of ____° and the aircraft is to the (left, right) of the radial
10° and the aircraft is to the right of the radial (needs to turn left to regain track)
(remember the outer circumfrance of the middle centre circle (dount) is the first 2° of deviation)
The main factor effecting VOR range is…
Mountainous terrian
You are tracking inbound on the VOR 030° radial. What OBS setting should you set to provide command indications, and what would be the correct TO/FROM indication?
210° set on the OBS, TO flag showing
Route Operating Limitations (ROL’s) give what en-route information?
Minumum reception altitude for some routes and other routes a change over point is shown where beyond reception is deemed not entirely reliable.
