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H145 > ATA 34 - NAVIGATION > Flashcards

ATA 34 - NAVIGATION Flashcards

1
Q

What is an ADF?

A

Automatic Direction Finder, low frequency, low range, low accuracy

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2
Q

Where does an ADF recieve a signal from?

A

a signal transmitted from a Non-Directional Beacon (NDB)

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3
Q

Where is the ADF antenna located?

A

Inbetween the RAD ALT antenas on the first antenna plate on the
bottom the the FWD tail boom.

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4
Q

Where is the ADF reciever?

A

in the avionic deck

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5
Q

What is VOR?

A

Very High Frequency Omnidirectional Radio Range

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6
Q

What kind of signals does a VOR ground station transmit?

A

Radials which also give reference to magnetic north.

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7
Q

What informationdoes an ILS supply?

A

Glideslope,marker beacon, and localizer

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8
Q

What defines the ILS frequency?

A

the localizer frequency

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9
Q

How is the Glidslope frequency assigned?

A

Automatically

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10
Q

What information does the localizer give?

A

left/right guidance. It defines the centre line.

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11
Q

What information does the Glidslope give?

A

up/down guidance at approx. 3 degrees

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12
Q

How many NAV receivers are there?

A

two GTN750’s (on the slant console)

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13
Q

What items are in the VOR system?

A

two nav receivers, FMS1&FMS2, two VHF antennas, coupler

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14
Q

Where are the VHF antennas?

A

on both sides of the tail boom

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15
Q

What is a Marker Beacon System?

A

It’s part of the ILS system, indicating the distance to touch down on the runway.

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16
Q

What frequency do the marker beacons operate at?

A

75MHz, but different modulation

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17
Q

How are the different marker beacons recognised?

A

they’re shown in different colours and different audio alerts.

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18
Q

How many Markers can there be? And what are they called?

A

Three. Outer, Middle, Inner

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19
Q

Where is the marker antenna located?

A

the lower l/h mid body of the aircraft.

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20
Q

What is DME?

A

Distance Measuring Equipment

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21
Q

What is the purpose of DME?

A

To provide and indication of the distance from a ground station to the aircraft.

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22
Q

When is a DME frequency selected?

A

automatically when a VOR frequency is selected.

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23
Q

How does a DME work?

A

The DME transmitter (interrogator) in the aircraft sends a signal to the ground. When a ground station receives it, it automatically transmits a reply signal. The time it takes for the signal to be reveived back gives the distance and time to go.

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24
Q

What is slant range error?

A

the error given with regards to pythagoris thearem of hypotenuse. The distance to a point from altitude is greator than on a horizontal plane.

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25
Q

When does Slant-Range error increase?

A

the closer an aircraft approaches the station.

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26
Q

What range does the DME provide?

A

the slant range.

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27
Q

Where is the DME receiver located?

A

on the avionic deck

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28
Q

Where is the DME antenna?

A

the r/h lower mid body

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29
Q

What information will the MFD provide from the DME?

A

frequency, distance, station name and time to go

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30
Q

How many surveillance systems does an ATC use?

A

Two. Primary providing azimuth and distance of flying echos, and the Secondary Surveillance Radar (SSR) which interrogates the onboard transponder

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31
Q

Interrogated transpoders reply what data?

A

SQUAWK code set by the crew (MODE A), flight level (MODE C), a 24-bit address, airfract reg, flight ID, altitude, transponder capability and status (air/ground)

32
Q

Where is the ATC antenna?

A

lower l/h midy body (behind the marker beacon)

33
Q

how do you change the transponder from “ground” to “active”?

A

by unlocking the collective lever

34
Q

Where does the transponder recieve power?

A

28v from the AVI ESS BUS 2

35
Q

Activating the ATC transponder is done how?

A

Active FMS1/2 switch, press the “ON” function key (selects mode A & S) and unlock the collective. Press “altitude reporting for MODE C

36
Q

What modes of operation are available on the transponder?

A

Standby - Transponder powered but not transmiting
ON - MODE A & S
Altitude Reporting - responds on all 3 modes, A, S & C

37
Q

What is Transpoder Mode A?

A

Transmits the squawk code only.

38
Q

What is transponder Mode C?

A

Transmits the squawk code along with pressure altitude information

39
Q

What is transponder mode S?

A

Provides more detailed information, including 24 bit address, a/c reg, flioght ID, altitude, transponder capability, status (air/ground)

40
Q

How long does it take for a satellite to orbit the earth?

A

12 hours

41
Q

How many satellites does it take for GPS reception?

A

5

42
Q

What are the 5 satellites called?

A

RAIM (Receiver Autonomous Integrity Monitoring).

43
Q

What is the system called that uses GPS?

A

Global Navigation Satellite System (GNSS)

44
Q

How many segments is a GPS system divided into?

A

Three. Control, Space & User

45
Q

How accurate is GPS?

A

Up to 15m.

46
Q

What is more accurate than GPS?

A

Differential GPS (DGPS).

47
Q

How accurate is GDPS?

A

up to 1.5m

48
Q

What is a Satellite Based Augmentation System (SBAS)?

A

A system that uses one geostationary satellite that sends delta information to a GPS reciever.

49
Q

Where is the Delta information from an SBAS calculated?

A

A ground station.

50
Q

Where are the GPS (GTN750’s) located in the aircraft?

A

on the slant console.

51
Q

How does a Radio Altimeter work?

A

By Transmitting a radio singnal to the ground and measuring the time delay it takes to reflect and be received back.

52
Q

How many antennas are in the a/c RadAlt system?

A

2.

53
Q

Where are the Rad Alt antennas located?

A

Bottom of the tail boom. The FWD transmits and the rear recieves.

54
Q

When is the Rad Alt tested?

A

during the Pre-Flight test.

55
Q

How many Pitot-Static systems does the H145 have?

A

Two independent systems

56
Q

What is included in the pitot static system?

A

Two pitot tubes, four static ports, Connection Hoses and an Alternate cabin static pressure selector valve

57
Q

All pitot and static ports are heated. True or False?

A

True, both pitot and all 4 static are heated.

58
Q

Which pitot-static system is the static selector valve connected to?

A

system #2

59
Q

What does the static selector valve do?

A

measures the cabin Px

60
Q

What is each pitot-static system connected to?

A

an ADC (1/2)

61
Q

What are the ADC’s equipped with to check temperture?

A

A total temperture probe unit (TTPU)

62
Q

Which pitot-static system is the IESI connected to?

A

pitot-static system #1

63
Q

Calculated values from the pitot-static are sent where?

A

To both ADC’s

64
Q

What is the use of the TTPU?

A

To capture the total air temperture so the ADC can then use the data to correct the calculated air data.

65
Q

Where are the static ports located?

A

LH and RH side of the fuselage aft deck

66
Q

Where are the ADC’s installed?

A

in the L/H and R/H forward bottom structure.

67
Q

What kind of cable does the AHRS use?

A

Glass fibre optic

68
Q

What does the AHRS measure?

A

altitude and turning & acceleration rates

69
Q

Where does the data from the AHRS go?

A

To the AMC’s.

70
Q

How many AHRS are installed?

A

Three

71
Q

What is the purpose of the IESI?

A

Back up in case of failure of instruments, additional sensor for IMA and for backas SAS.

72
Q

Where is the IESI powered from?

A

ESS BUS 2, and if needed by EMER BUS.

73
Q

After powering up, how long does the three internal rate gyros need for alignment?

A

110 seconds.

74
Q

How is the indicated heading adjusted on the stand-by compass?

A

by two compensation adjustment screws

75
Q

What power is used in the STNDBY COMPASS?

A

internal lighting from ESS BUS 2

H145 (20 decks)

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