Navs Midterm
An HSI compass card can be set using ______
The air data computer
The slaving accessory
The navigation radio
The vertical gyro
An gyro compass system uses a _____ for reference.
Horizontal gyro
Vertical gyro
Air data computer
Synchro
How long after we power off the gyro do we have to wait until we can safely handle the component?
10 mins
20 mins
30 mins
1 hr
What does the flux valve do in a slaved compass system?
Provides rigidity in space for the dg
Senses earth’s magnetic field
Allows piolet to control the slaving functions of the dg
Senses true north
The VOR system is tested every ____ to test accuracy with a tolerance of plus or minus _____.
10 degrees, 1 degree
30 degrees, 2 degrees
30 degrees, 5 degrees
90 degrees, 4 degrees
What does the VOR receiver on the aircraft do in order to determine the bearing to the station?
Compares the variable & reference phase signals to compute a phase difference
Measures strongest signal to determine bearing
Measures the time difference between the variable & reference signals
Compares the reference & variable signals to calculate a time variation
The VOR system is tested for a course width of ______ degrees.
+/-2.5
+/-5.0
+/-10
+/-30
If while testing a VOR the 30hz modulation is reduced to zero, what effect will it have on the UUT?
The VOR continues to function normally
The to/from flag will show from only
The indicator will flag
90 degree bearing will occur
What frequency spacing does VOR use
8.33kHz
25kHz
50kHz
150kHz
What is quadrantal error?
Errors introduced in the ADF signal because of p-static and electrical interference
Hard iron effects in aircraft result in ADF bearing errors
ADF bearing information can only be received from in front of aircraft
Bending of the ADF signal when passing from land to water
Where in the ADF installation would you find and “L” bang filter?
In the loop antenna wiring
Between the sense antenna feed co-axial and the radio
In the transponder system
In the power supply
What is the purpose of the sense antenna in the ADF
Remove the position ambiguity to determine bearing to station
Sense when the aircraft is close to the NDB
Determine the direction of the station along a line
Receive the 30Hz variable signal
When is BFO mode used on the ADF?
When direction finding is required
When you want to generate a 1000Hz audio tone to help identify stations
When you want to disable the sense antenna
When no direction finding is required, but audio reception is desired
The application of 0.093 DDM on a localizer will cause the D-Bar to move ____ from center.
60% of indicator FSD
9.3% of indicator range
2 dots on a 5 dot CDI
Full scale of CDI
What is the course width of a localizer Signal?
2.5 degrees
5 degrees
10 degrees
20 degrees
What is frequency range of the localizer system?
108 – 117.95 MHz (odd 0.1 MHz)
108 – 117.95 MHz (even 0.1 MHz)
108.1 – 111.95 MHz (even 0.1 MHz)
108.1 – 111.95 MHz (odd 0.1 MHz)
What frequency is used by the marker beacon system?
75 kHz
75 MHz
121.5 MHz
1090 MHz
What lamp colour is associated with the middle marker?
Magenta
White
Blue
Amber
What is the standard glidepath angle for the glide slope system?
1.5 degrees
3 degrees
5 degrees
7.5 degrees
When testing a glide slope the D-bar moves up when ________.
The 150HZ modulation is greater than the 90Hz modulation.
The 90HZ modulation is equal to the 150Hz modulation
The 90HZ modulation is greater that the 150Hz modulation
The 150Hz modulation is deleted
What type of antenna is the #1 arrow pointing at?
Glideslope
Localizer
Radar
Marker Beacon
What is represented by the angle X?
Heading
Track angle error
Cross Track
Desired Track
What is a Waypoint?
Any Airport
A Position in space identified by a latitude & longitude
A stopping point along a flight path
A destination
The angle between the direction of an object and another abject is called?
Track
Bearing
Heading
Variation
What information is contained in the Almanac?
GPS Gate?Time
GPS status/health of individual sattelite
Precise orbit of the individual satellite
Coarse orbit and status information for all satellites
If a GPS receiver has and (old) out of date almanac. What would you expect to happen when powering up the GPS?
GPS will prompt user to load a new almanac
GPS will not acquire a #D position fix
GPS will take longer than usual to acquire a position fix
GPS will show an error message indicating almanac requires updating
What is the minimum number of satellites required to generate a 3D position fix?
1
2
3
4
When aircraft is using the GPS navigator for IFR approved operations, how often must the internal navigation database be updated?
Every 14 days
Every 21 days
Every 28 days
Every month
Sub frame one of a GPS downlink contains _______.
The satellite health data
The ephemeris
The almanac
The transmission bit rate
A turn coordinator is commonly referred to as a _____________ gyro.
Rate
Universal
Vertical
Free
What does the compass use as its reference?
Ground based navigation aids
Prime meridian
Magnetic north
True north
While navigating the difference between heading and track is the ____________.
Desired track
Track angle error
Drift angle
Cross track
A vertical gyro outputs _____________.
Yaw information
Pitch and roll information
Heading information
Climb information
Where is the Flux valve located on an aircraft?
Nose or Engine
Nose or Cockpit
Wing or Tail
Wing or Engine
On what instrument would you find the localizer information displayed?
Course deviation indicator
Multi-function display
Compass
Heading indicator
In the marker system what depth of modulation is used?
20%
30%
60%
95%
What is the standard glideslope course width?
1.4°
5°
10°
14°
If the glideslope being tested has only the 150 Hz modulation present, what indication will the technician see?
The D-bar will be centered and the flag will be in view.
The D-bar will be full down and the flag will be in view.
The D-bar will be full up and the flag will be in view
The D-bar will be full up and flag will be out of view.
What depth of modulation is used by the 150Hz signal on the localizer system?
20%
30%
40%
95%
Testing a marker beacon requires a modulation depth of ___ set on the test equipment.
500 feet
30%
50%
95%
The marker beacon has a middle marker sense output, What is this used for?
It is a voltage to light a remote marker lamp.
It outputs a voltage during lamp test to confirm lamp serviceability.
It changes the marker receiver sensitivity
It is a voltage used to establish a change in the auto flight system.
During an ILS approach which marker is considered the missed approach point?
Outer
Middle
Inner
Airways
If a marker beacon audio is heard but the lamp does not light, what would you check as a possible fault?
Receiver defective
Antenna co-axial open or shorted
Headphones loading the radio output
Defective lamp
The airways marker in the ILS system uses a modulation frequency of
400Hz
1300Hz
3000Hz
75MHz
Refer to attached image. This belly mounted antenna is for the____.
Transponder
Marker beacon
ADF
ODME
What audio tone is associated with the inner marker?
75 Hz
400Hz
1300Hz
3000Hz
What lamp colour is associated with the Inner marker?
White
Blue
Magenta
Amber
Where is the marker beacon antenna located on the aircraft?
Tail
Bottom
Top
Wingtip
What is the purpose of the Instrument Landing System?
To provide the aircraft with distance to touch down
To provide position information for worldwide navigation
To aid aircraft on their approach to landing
To automatically land the aircraft in poor weather
The Localizer testing requires a DDM of 0.093 left and right. What does DDM
Depth of Deflection Measured
Difference in Depth of Modulation
Deflection of Deviation Meter
Deflection Difference Measured
The application of 0.093 DDM on a localizer will cause the D-Bar to move from center.
2 dots on a 5 dot CDI
Full scale of CDI
60% of indicator FSD
9.3% of indicator range
What depth of modulation is reserved for station identification in the localizer system?
5%
20%
30%
50%
While landing the CDI D-Bar has a left deflection. What does that mean?
The radio is receiving more 150Hz modulation that 90Hz modulation
The aircraft is out of range of the station
A left deflection always occurs when the flag is inoperative
The pilot must fly right to correct the off course condition
The localizer indicator has a course width of
± 0.5 degrees
± 2.5 degrees
± 5 degrees
± 10 degrees
Which of the following conditions will exist for an "out of view" flag on a localizer system?
The loss of either 90Hz or 150Hz modulation being received
A flag current of 150 micro Amps
The 90Hz signal is greater than the 150Hz signal by 4dB and the composite signal is 0.35Vrms
A very weak RF signal being received
What depth of modulation is used by the 90Hz signal on the localizer system?
20%
30%
40%
95%
As viewed from the approach to a localizer, the modulation tones are
30Hz left 90Hz right
90Hz left 150Hz right
150Hz left 90Hz right
150Hz down 90Hz up
When testing a localizer converter a 4dB DDM should produce
A current of 78 microamps to the D-bar
A current of 90 microamps to the D-bar
A current of 150 microamps to the D-bar
A current of 260 microamps to the D-bar
When approaching a runway using a localizer the CDI D-Bar is centered and the flag is out of view, what does this mean?
The radio is defective
The aircraft is right of the runway center line
The pilot must fly right to correct for landing
The aircraft is on the runway center line
111.10 MHz is a
ADF
Marker beacon
VOR
Localizer
What audio frequency is used to modulate the…
75 Hz & 400 Hz
90 Hz & 150 Hz
400 Hz & 1300 Hz
75 Hz & 90 Hz
What indication will be shown on the localizer
Centered
Fly left
Fly right
What principle does the localizer system rely on to determine the lateral position of the aircraft relative to the approach course?
It measures the time required for the signal to travel to the ground and back to the aircraft
It compares the phase of the two transmitted signals
It uses time signals to triangulate its position
It compares the strength of the two transmitted signals
On what instrument would you find the localizer information displayed?
Course deviation indicator
Compass
Multi-function display
Heading indicator
Where would you find the localizer antenna on a GA aircraft?
Upper fuselage
Nose
Vertical stabilizer
Belly
During an approach to land an indicated "down" deflection from a glideslope shows the aircraft is______.
Too low and must climb
Too high and must descend
Is operating normally and no action is required
Signifies a failure in the system.
What is the channel spacing used on a 40 channel glideslope receiver?
25KHz
50KHz
100KHZ
150KHZ
What deflection of the glideslope D-Bar results from a DDM of 0.175 150Hz predominant applied to the input?
Full scale deflection up
A centered D Bar
Standard 53% deflection up
Standard deflection down
How many degrees off glide path is represented by full scale deflection of the D- Bar on a CDI?
0.1 degrees
0.2 degrees
0.7 degrees
2 degrees
How much flag current is required to operate the glideslope flag out of view?
78 uA
90 uA
150 uA
260 uA
What is the depth of modulation the glideslope ground station transmits?
20% of each tone
30% of each tone
40% of each tone
50% of each tone
For a standard deflection on a glideslope, what is the DDM setting in dB?
OdB
2dB
4dB
10dB
What angle, aircraft to ground, is considered a normal glidepath during landing?
1 degree
3 degrees
5 degrees
12 degrees
If the glideslope ground station in use has only the 90Hz modulation present, what indication will the pilot see?
The D-bar will be full down and the flag will be in view
The D-bar will be centered and the flag will be in view
The D-bar will be full up and the flag will be in view
The D-bar will be full up and the flag will be out of view
When performing a ramp test on a glideslope system, what DDM setting should be used to test for full scale deflection?
0.091 DDM
0.093 DDM
0.155 DDM
0.175 DDM
What is the standard impedance of a glideslope meter movement in an HSI?
100 Ω
200 Ω
600 Ω
1000 Ω
Refer to attached image. Which system is this antenna from?
Marker beacon
Glide slope
Localizer
ADF
How is the glideslope frequency tuned?
Manually, by entering in the navigation radio
Automatically when the airport is selected in the GPS
Automatically when the localizer frequency is tuned
No tuning necessary, it is a fixed frequency
What happens to the received signal strengths of the tones if the aircraft is below the glidepath?
Only the 150 Hz tone will be received
There is equal amplitude for the 90 Hz and 150 Hz tones
No tones will be received
There is a difference in amplitude between the 90 Hz and 150 Hz tones
Refer to the attached image. What Indication will be shown on the glideslope Indicator in the cockpit of the WHITE aircraft?
Below glidepath
Fly down
Centered
What indicator would be used to display the glideslope information in the cockpit?
RMI
HSI
MFD
Attitude indicator
Where would you find the glideslope antenna on an airliner?
Nose
Belly
Upper fuselage
Vertical stabilizer
The middle marker in the ILS system uses a ____ lamp for annunciating beacon passage.
White
Amber
Blue
Red
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