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Flight Nav > Radio Navigation Aids > Flashcards

Radio Navigation Aids Flashcards

1
Q

What info does the Doppler navigation system provide

A

Ground speed
Drift
Track

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2
Q

Disadvantage of single beam Doppler system

A

Pitching errors
Vertical motion
Transmitter instability
Drift error

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3
Q

What does Tacan provide

A

Slant range
Bearing to beacon
Morse cod ID for beacon

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4
Q

What information does tacan provide in air to air mode

A

Coarse bearing and slant range

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5
Q

Explain transponder principle

A

A/c transmits question to ground the beacon responds the time between transmission and reception determines slant range

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6
Q

Tacan uses 2 modulation frequencies what are the frequencies and what do you obtain from them

A

15hz - coarse bearing
135hz - fine bearing

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7
Q

What is the purpose of the identify chain

A

Provides morse code id of the beacon into the pilots headset

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8
Q

What nav systems coordinate with the DME system

A

VOR
ILS
MLS

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9
Q

What is the purpose of the range chain

A

Calculates the time between transition and reception determines slant range

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10
Q

What information does VOR provide

A

Bearing to beacon

Fly left fly right indication

To from indication

Morse code identify

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11
Q

Purpose of ILS

A

enables pilot to fly a/c along an extended runway centre line in poor visibly

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12
Q

Describe LOC localiser

A

Fly left - 150hz
Fly right - 90hz

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13
Q

Describe glideslope

A

Fly up -150hz
Fly down 90hz
Provides a 2 to 3• glide path angle

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14
Q

Marker beacon distances

A

Outer 3.9 NM
Middle 3500ft

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15
Q

Purpose of MLS

A

Elevation
Range info
Azimuth

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16
Q

Advantage of MLS over ILS

A

No site prep
200 channels
Less vulnerable to signal reflections

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17
Q

How does MLS determine a/c position in relation to centre line

A

Received to and fro pulse, azimuth beam sweeps the gap between pulses determines a/c position

18
Q

To and fro pulses

A

Left 14ms
Centre 10ms
Right - 6ms

(Maybe)

19
Q

What is the purpose of De-mud block

A

Separate elevation and azimuth signal

20
Q

Purpose of GPS

A

Provides continuous longitude and latitude, velocity and time anywhere on earth

21
Q

What information is contained within the signals transmitted by a gps satellite

A

Pseudo random code
Almanac data
Ephemeris data

22
Q

What info does almanac data provide

A

Status of satellites
Current time and date

23
Q

Why are atomic clocks used in gps

A

More accurate

24
Q

What factors reduce accuracy of gps

A

Satellite shading
Ionosphere and troposphere delays
Multipath errors
Orbital errors
Receiver clock errors

25
Q

Purpose of rad alt

A

Provides accurate height induction up to 5k feet

26
Q

Advantages of using rad alt over barometric

A

Extremely accurate
Provides actual height above ground

27
Q

3 modes of operation (rad alt)

A

Lock/follow
Search
memory

28
Q

How does rad alt work (fmcw)

A

Signal is transmitted to ground reflects and comes back difference between transmitted and received frequency is proportional to height above ground

29
Q

Explain Rad alt pulsed

A

Pulse sent to ground and reflected time difference between transmitted and received pulse is directly proportional to height above ground

30
Q

How does memory mode work (rad alt)

A

When rad alt loses lock it waits .2 seconds if signal doesn’t reappear the computer goes into search mode but pointer is held steady for 1 second

31
Q

Purpose of GPWS

A

Provides warning to pilot of imminent collision with terrain

32
Q

Types of warnings provided by gpws

A

Visual
Aural

33
Q

What systems coordinate with gpws

A

INS
GPS

34
Q

What factors determine recovery manoeuvre time

A

Pilot reaction time
Stick input at a preset g level
Time for a/c to level

35
Q

What are secondary functions of EGPWS

A

Navigation
Weapon aiming

36
Q

What is the purpose of Automatic flight control system

A

Reduce pilots workload
Overcome stability problems
Carry out automatic manoeuvres

37
Q

Component of auto stabilisation

A

Rate gyro
Amplifier and signal processor
Servo actuator
Control surface
Aerodynamic effects

38
Q

Purpose of autopilot

A

Reduce pilot work load

Detects long term a/c instability

39
Q

Basic mode (auto pilot)

A

Holds its attitude and heading

40
Q

Autopilot modes

A

Hold or lock
Acquire or capture

41
Q

Displays that indicate flight director symbology

A

Attitude indicator
HSI or EHSI
Multi function display
Head up display

42
Q

Autopilot safety devices

A

Pilots instinctively cut out
Control limiter
Torque limiter
Monitoring facilities
Rate and angle limiters

Flight Nav (7 decks)

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