3 Nav Q Flashcards
(23 cards)
What tracks do NDB and vor follow
Great circle tracks
What is apparent and real drift in a DG
Apparent: due movement across the earths surface
Real: due to gyro imperfections and bearing drag
RMI heading reference
Maintains own alignment with ac heading by use of electrical hdg reference system from the flux valve
Where is the max earth rate wander for a DG
At the poles
What is the benefit of the RMI over the compass
Less error during manoeuvres
If the Mno has a red flag it means it is unreliable and the
Vmo is probably also unreliable
What ADC inputs are required for obtain a TAS output
Pitot static - ADC receives dynamic and static pressure info from the pitot static source
And TAT
Advantage of a servo assisted altimeter over a conventional altimeter
Reduced lag error at high altitude
What happens to a dme readout when approaching overhead
Dme GS will reduce at an increasing rate then increase at a decreasing rate
What is the beam width of an ILS display
Full deflection left to right is 5 degrees
Met conditions giving max amount of radar energy reflected from a cloud is
Heavy wet snow
Characteristic having most effect in determining if wx radar return will be received from a particular size water droplet is
Wave length (operating frequency)
What does wind do to the position of the CP
Wind changes position but not time
What principle does a radio altimeter operate on
Continuous wave, phase, frequency modulation
What signal does a VOR ground station transmit
In the VHF band, horizontally polarised
What are great circles on a polar stereographic
Approximately straight lines near the poles
What components of an INS measure linear acceleration
Accelerometers
What do HF radio waves primarily propagate by
Single and multi hop sky waves
Frequency of a radio signal is defined as
Number of wavelengths passing a given point in one second
Phase angle of a radio wave can be divided by 360 FYI
1 quarter is 90 degrees
What is amplitude modulation
Method of transmitting info via radio waves by varying the amplitude of the carrier wave signal according to variations in the amplitude of the info being transmitted
A horizontally polarised radio antenna transmits a signal which is
Horizontal in its electrical element and vertical in its magnetic element
Gps S/A is
The ability of the satellite operator to degrade the signal accuracy to 100mt with an average PDOP
