Radio Aids Flashcards
The slaved gyro magnetic compass (gyrosyn) minimizes the oscillation and turning errors associated with the p-type magnetic compasses through the utilization of a:
Directional gyro unit slaved to a remote compass transmitter
The distance between the transmitting antenna and the point where the sky wave first returns to the surface of the earth is called the:
Skip distance
T/F - VORs depend upon a phase difference between two signals transmitted simultaneously from a ground station
True
T/F - the RMI is an instrument which can provide hdg and mag bearing info to LF/MF and VOR facilities
True
T/F - DME relys on the measurement of the time between the transmission of an aircraft interrogating signal and the receipt of a matched pulse reply signal from a ground station (the 2 signals having different freqs)
True
T/F - SSB transmitters eliminate one side and and all or most of the carrier wave in order to increase transmission power; the carrier is reinserted by the receiver to reproduce the original message
True
How do you increase reception range on HF radios?
Using lower freqs at night and higher during the day
T/F - inertial reference systems use a strap-down system with ring laser gyros which measure rate of rotation
True
WAAS-corrected GPS signals offer approx 5x greater position accuracy than basic or uncorrected GPS signals. Another true statement would be:
WAAS geo satellites provide a ranging signal which improves availability
ACARS functions: (4 of them)
- Obtain text based station and en route wx
- Send receive messages to/from company
- Obtain IFR clearance
- Auto detect and transmit OUT, OFF, ON, and IN times
AC with ADS B in capability:
Can receive traffic info and upload text and graphic wx
MLAT functions:
- Uses strategically placed ground stations to send interrogations and receive replies from transponders
- Principle of time difference of arrival
- Calculates the difference in transponder response time at multiple ground receivers and compares results to determine position
- Replies to mode A, C, S
What GPWS visual and aural message can be inhibited in flight?
Excessive deviation below glide slope in landing config
An EFIS utilizes cathode ray tubes to electronically display flight info. ____ receive inputs from various AC systems, respond to these inputs and changes the date into video signals which are sent to the respective CRTs for display.
Symbol generator units.
An EFIS comparison fault refers to the:
Symbol generators detection of a disagreement between the captains and FO’s EFIS systems in attitude, air, or nav data.
On Boeing aircraft LNAV and VNAV provide:
Lateral nav along the flight route in the FMC and vertical nav along a FMC computed vertical path
Static blockage to alt, ASI, VSI
Alt - freezes at last altitude
ASI - over read in descent, under read in a climb
VSI - freezes at zero
Pitot blockage to alt, ASI, VSI
Altimeter - no effect
ASI - over read in climb, under read in a descent
VSI - no effect
Your airspeed goes to zero in a climb. What does this indicate?
Pitot blocked with drain vent open
NDBs are checked within how many degrees for an app and on airway/route
+/-5 for an app
+/-10 for airways/routes
Fixed Card ADF formula
BTS = MH + RB
BTS = radial flying or wanting to intercept
MH = actual magnetic hdg of AC
RB = hdg to fly on fixed card ADF to intercept
VOR airways/radials checked within how many degrees?
+/-3°
VOR receiver checks
Airborne +/-6
Dual VORs - +/-4
DME must be checked within how many miles or %
0.5nm or 3% the distance whichever is greater
Localizer range reliability
35° out to 10nm (front and back course)
10° out to 18nm
Full scale deflection VOR, LOC, GP
VOR - +/-10
LOC - +/- 2.5
GP - +/-0.7
When a pilot checks an aircraft’s VOR receiver against a VOT, if the OBS is set to _____ the TO/FROM sense indicator should display a ______.
180°, TO
What is a possible disadvantage of using the VOR to navigate at high altitudes?
On occasion, station coverage areas overlap causing erroneous VOR readings
A military TACAN can provide what to civi aircraft?
DME, by selecting the paired VOR freq
Your aircraft is flying a GS of 140kts, while heading 180°M. You cross the 270° radial of a VOR at 1500Z. At 1502Z you are on the 260° radial. How far is your aircraft from the VOR?
2/10= 0.2
0.2 X 140 = 28
28nm
ADF night effect is caused when:
Sky waves returning to earth interfere with ground waves. Most pronounced with higher freq’s.
ADF bearing accuracy can be affected by precipitation static, thunderstorm effect, and night effect in the same way. What error is common to all three?
Causes the bearing pointer to fluctuate excessively.
Precipitation static is most pronounced in:
Snow and/or ice crystals
ADF thunderstorm effect in addition to causing erratic fluctuations of the bearing pointer may cause:
The bearing indicator to point to a thunderstorm.
Approx ranges of PSR and SSR
80, 250
GNSS min sat req for: triangulation, 3D, RAIM, FDE
3, 4, 5, 6
Types of transponders req for TCAS
For TA to be generated - less than mode C
For an RA - we need Mode S, they need mode C
For both to get an RA - both need mode S
As IAS increases, what happens to the Mach number?
Decreases
What is the skip zone?
Distance between where the sky wave first returns to earth and where the ground wave ends
What is a cycle?
Period of time to complete a full wave (freq is cycle per sec)
What is a wavelength?
Length of a radio wave in metres
What is amplitude?
Width of a wave. Measure of the signal strength.
The compass card of the RMI is slaved to what?
Flux valve which is usually located on the wing tip away from other electrical interference, and drives it to align with magnetic North.
How far is a FAF from the threshold normally?
3.5 to 6nm
If you are in the reliability zone of the loc but not on the loc beam, what indications will be shown?
Full scale deflection and an off flag out of view
What does an X mean when on the ident for an ILS?
That the loc is more then 3° of centreline, meaning there will be no glide slope
Will ATC see that you are getting an RA if you are ADS-B equipped?
No
What does an INS provide?
ATTITUDE, AIRCRAFT POSITION, GROUND SPEED, WX RADAR STABILIZATION, heading, vertical speed
What is GPS accuracy based off of?
Satellite geometry, signal through the ionosphere, precise timing
What are the three types of augmentation?
ABAS (RAIM)
SBAS (WAAS)
GBAS (LAAS)
What are the raim alert levels?
- 2nm en route
- 1nm terminal (within 30nm of field)
- 0.3nm on app (2nm inbound to FAF)
What +/- do GPS NOTAMs need to be check for an alternate?
+/-60mins of ETA
•if 1 satellite out, good to go
•if 2 or more out, must do PRAIM
- if outside of +/- 15mins can’t use alt
T/F - for WAAS NOTAMS, if 2 outages of less then 15mins each are predicted, and separated by less then 15mins, the whole period will be NOTAM’d
True
