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Avionics Systems Intro Theory (ELCM 355) > Module 9-10-11-12 > Flashcards

Module 9-10-11-12 Flashcards

1
Q

The VOR (VHF Omni-directional Range) system ranges between which frequencies?

A

108.00 to 117.95

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2
Q

There are two phase signals broadcasting from a VOR ground station. What are they?

A

Reference phase & Variable phase broadcasting

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3
Q

3 things that could indicate a flag showing on a CDI?

A

Not tuned to the right station
The station is too far away
Could be missing the reference or variable signals

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4
Q

What does CDI stand for?

A

Course Direction Indicator

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5
Q

What does RMI stand for?

A

Radio Magnetic Indicator

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6
Q

Where does the indicator always point to on an RMI?

A

Always points towards the station

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7
Q

What does the HSI represent?

A

(Horizontal situation indicator) Shows a TO/FROM indicator

Shows a deviation line in the middle showing how on or off course the aircraft is

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8
Q

Testing procedure for the VOR system

A

Power up aircraft (AC and DC)
Avionics MAster On
Unit of testing turned on
Dial in 108.00 test frequency
Check VOR audio, select NAV for tone output
Check for flags pulling or dropping into view
Check needle deflection +- 20 degrees
Check TO/FROM indicators
Check needle centering accuracy +- 3 degrees

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9
Q

Frequency Range for a DME? (Distance measuring equipment) (NAV)

A

960 MHz to 1215 MHz

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10
Q

The ground station sends out ________

A

Squitter pulses

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11
Q

The aircraft DME starts to transmit in search mode called_________

A

Jitter

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12
Q

The total time it takes for an RF signal to travel from a ground station to an aircraft and back is ___________

A

12.36 microseconds

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13
Q

What does ADF stand for?

A

Automatic Direction Finder

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14
Q

What is the ADF used for?

A

To find the aircrafts bearing

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15
Q

What is the frequency range for ADF?

A

190 kHz to 1750 kHz

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16
Q

An ADF with a fixed compass card can only indicate__________ bearing to an NDB

A

To/Forward

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17
Q

What is the purpose of an ADF sense antenna?

A

Adds an omnidirectional pattern to the signal, eliminating the null with the loop antenna

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18
Q

How can the sense antenna be selected by the pilot?

A

Using the Ant-Rec button, turning off the loop antenna, which allows listening only

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19
Q

What is the funtion of the switch marked BFO or TONE?

A

Causes the incoming frequency to “beat” against the BFO. The difference comes out as audible morse code

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20
Q

In addition to distance-to-station, an airborne DME computes_______and_________

A

Time-to-station & groundspeed

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21
Q

All aircraft interrogating the same DME greound station are all the same frequency. How does an aircraft identify its replies from all others?

A

If the aircraft detects the same signal coming back as the one it sends out to the station

22
Q

How is a DME station tuned in?

A

If the aircraft sends an interrogation signal to the grounbd station, and then sends back a reply to the aircraft

23
Q

What happens when more than 100 aircraft interrogate the same DME ground station?

A

To avoid overload, the station reduces its receiver sensitivity, by excluding more distant aircraft

24
Q

Why does the DME ground station delay its reply by 50 microseconds?

A

To give the station time to receive the pulses from the aircraft and verify it is the correct one before sending a reply

25
Q

The VOR reference phase broadcasts in what direction?

A

All directions (omni-directional)

26
Q

The VOR variable phase rotates _________a second

A

30 times

27
Q

HOw does an aircraft VOR receiver know its bearing form a gorund station?

A

The difference between the variable and the reference phases determines the bearing

28
Q

The 2 tones broadcasted on a localizer are

A

90 Hz and 150 Hz

29
Q

What component of an ILS (Instrument Landing System) provides an extended centerline to the runway?

A

Localizer

30
Q

What component of an ILS provides vertical guidance to a runway?

A

Glideslope

31
Q

How are glideslope receiver frequencies selected?

A

Choosing the right frequency on the VOR in the cockpit

32
Q

How many satellites are there in a GPS constellation?

A

24 Satellites

33
Q

Name the 3 segments of a GPS system

A

Space segment
Control segment
User segment

34
Q

Localizer uses the ______ frequency band and the glideslope uses the _________frequency band

A

VHF - Localizer

UHF - Glideslope

35
Q

What frequencies does the ILS system use?

A

108.10 to 111.950

36
Q

What system does an RMI NOT display?

A

The ILS system

37
Q

What must be required in order for an ILS flag to pull?

A

Both the 90 Hz and 150 Hz signals

38
Q

What does the DGPS (Differential GPS) do?

A

Greatly increases the accuracy of the GPS system

39
Q

What does LAAS stand for and where is it typically used?

A

Local area augmentation system is usually installed around airports for greater accuracy

40
Q

2 parts of an ATC Transponder System

A

Primary Surveillance Radar

Secondary Surveillance Radar

41
Q

What frequency range is used for the primary radar?

A

1250 MHz to 1350 MHz

42
Q

What frequency range is used for secondary radar?

A

1030 MHz to 1090 MHz

43
Q

From a ground station, 1030 MHz is for ___________ and the 1090 MHz is for ____________

A

1030 - Receiving

1090 - Transmitting

44
Q

From an aircraft transponder system, the 1030 MHz is for ___________ and the 1090 MHz is for _____________

A

1030 - Replying

1090 - Transmitting

45
Q

What is side lobe suppression in an ATC Transponder signal?

A

The suppression in a signal which the side lobes broadcasting from a ground station send out unintentional interrogations to aircraft, which the signal ignores. Otherwise the aircraft will blip in the wrong location

46
Q

In ALTITUDE mode on a transponder box in the cockpit, what signal will it send out?

A

BOTH squawk code and Altitude

47
Q

What is the Pulse order for a transponder signal?

A 
FRAME
C1
A1
C2
A2
C4
A4
blank
B1
D1
B2
D2
B4
D4
FRAME

Special IDENT signal (if turned on)

48
Q

What wave propagation is used for Transponders?

A

Direct wave propagation - Line of sight

49
Q

How do weather radar work and what are they used for?

A

They send out radio waves and those waves reflect off of target such as clouds, thunderstorms, rain, etc.
Also used to help avoid extreme weather

50
Q

Weather radar safety - What must we be aware of when testing weather radar?

A

Do not operate during fueling processes
Circuit breakers are turned off
Do not operate in the hangar
Do not operate when personnel are within 50 feet in front of it

51
Q

Radar altimeter works at a maximum of __________ (height)

A

2500 ft AGL

52
Q

Frequency range for Radar Altimeter?

A

4.25 GHz to 4.35 GHz

Avionics Systems Intro Theory (ELCM 355) (4 decks)

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