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AAS 1 > VHF OmniRange (VOR) > Flashcards

VHF OmniRange (VOR) Flashcards

1
Q

What does VOR stand for?

A

VHF OmniRange

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2
Q

The aviation industry uses three navigation systems that operate in VHF frequency band:

A

VOR, Localizer, and Marker Beacons

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3
Q

The VOR operates on what frequencies?

A

108.00MHz to 117.95MHz

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4
Q

A receiver on the aircraft receives the energy and demodulates the signal. That results in what?

A

A 30Hz sine wave called the Variable Signal

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5
Q

What is the varying energy transmitted as from a VOR station?

A

a Variable Signal

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6
Q

For the aircraft to determine the field direction:

A

the transmitted signal is Amplitude Modulated with a reference signal of varying frequency centered on 9.96KHz

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7
Q

What do Radials do?

A

Give imaginary lines on the ground that radiate in all directions from the VOR station

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8
Q

What depicts the VOR radials on Sectional Charts?

A

Compass Roses

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9
Q

What is the short range navigation system used throughout most of the world?

A

VOR

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10
Q

A well designed and installed VOR receiver can be accurate to within:

A

One compass degree

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11
Q

What does CDI stand for?

A

Course Directing Indicator

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12
Q

What does a CDI do?

A

Allows pilots to select and determine their relationship to the selected course

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13
Q

What does OBS stand for?

A

Omni Bearing Selector

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14
Q

What does the pilot use an OBS for?

A

to set the course

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15
Q

What was one of the early ways to indicate VOR bearings?

A

on a Radio Magnetic Indicator (RMI)

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16
Q

What does the RMI show?

A

the heading on the compass card and the bearing to the VOR station

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17
Q

What does RMI not have?

A

A CDI needle

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18
Q

Each dot on the CDI represents:

A

30 micro Amps and two degrees of course error

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19
Q

How else can VOR information be displayed?

A

on a Horizontal Situation Indicator (HSI)
Also known as a
Pictorial Navigation Indicator (PNI)

20
Q

VHF navigation receivers are almost identical in appearance to VHF communication receivers. A key difference is that:

A

a Navigation Transceiver does not have a squelch control. They do have an extra output for the navigation signal and an identification filter

21
Q

How are VOR stations identified?

A

a 1020 Hz Morse Code signal which makes the voice transmissions more understandable

22
Q

What is the heart of the VOR system?

A

the receiver

23
Q

What is a Localizer or LOC?

A

a system used to guide the aircraft down to the runway and is part of the ILS

24
Q

What does ILS stand far?

A

Instrument Landing System

25
Q

What is commonly used in light/smaller aircraft?

A

a transceiver. And in some systems is combined with VHF comm. Transceiver

26
Q

What do many large aircraft use?

A

an Integrated Flight Management System that includes both navigation and communication functions

27
Q

How many antennas does the VHF Nav system use?

A

two antennas typically mounted one to each side of the airframe

28
Q

What type of aircraft is the Whip style antenna used on?

A

light or slower flying aircraft that have less of a drag loading on the antenna

29
Q

What is the Whip style antenna normally mounted on?

A

the vertical stabilizer

30
Q

The Towel Bar style antenna is mounted where?

A

to either sides of the vertical stabilizer or fuselage

31
Q

What style type antenna is used on higher speed aircraft?

A

The V style
It has a larger footprint and more aerodynamic shape to reduce drag

32
Q

Where is the optimum placement of the V antenna?

A

forward on top of the fuselage

33
Q

What are Blade style antennas normally used for?

A

high speed aircraft and mounted to each side of the vertical stabilizer

34
Q

What type of aircraft are Blade style antennas found on?

A

business type and transport category aircraft

35
Q

VOR testing must be done how often and by whom are they usually performed and logged by?

A

within the last 30 days
usually performed and logged by the pilot

36
Q

What does VOT mean?

A

VOR Test Facility

37
Q

VOR test readings should not be greater than:

A

+/- 4 degrees from the desired heading
+/- 6 degrees is check is done in the air

38
Q

If the needle moves erratically, darting left and right, this typically is due to:

A

an internal component (a resolver) that turns with the OBS

39
Q

Anytime a VOR ground station is being worked on, what happens?

A

the technician turns off the audio ident which warns the pilot not to use the station for navigation

40
Q

If the VOR needle is swinging side to side slowly it is called:

A

course bends

41
Q

If the VOR needle is swinging side to side fast it is called:

A

course scalloping

42
Q

What does NOTAM stand for?

A

Notice to Airmen
a notice stating that certain radials of a VOR are unusable

43
Q

What causes both needles to move together like windshield wipers?

A

propeller or rotor modulation

44
Q

What is propeller or rotor modulation?

A

the signal from the ground station passed thru the propeller and is “chopped” in the spinning blades

45
Q

For propeller driven aircraft, be sure that the VOR antenna is mounted:

A

in the location suggested by the airframe manufacturer

46
Q

Rotor modulation in helicopters is more troublesome because:

A

the rotor blades cover a larger area.
this problem is known and filters in radios are provided and intended for helicopter operation

AAS 1 (25 decks)

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