Nav Systems Flashcards
What is the basic principle of operation of an NDB
NDB transmits a LF or MF signal in all directions which pilots can tune into to obtain a compass bearing to the aid
What are the rough ranges an NDB transmits
30 - 400nm
The acronym MINTQC can be used to describe what
The factors which affect NDB signal transmission and enduce erros and limit range
What does the acronym stand for
M: mountain effect I: interference from other transmissions N: night effect T: thunderstorm interference Q: quadrantal error C: costal effects
How many signals does a VOR transmit and what are they
2
Reference phase signal
Variable phase signal
On the pc21 one dot on the course deviation marker relates to how much deflection?
Half scale which is 5°
Is VOR considered more accurate than NDB
Yes
WRT VOR indication errors, whats the acronym which relates
A. airborne equipment errors V. Vertical polarisation error G. Ground station error A. Aggregate error S. Site effect error
What type of information does a DME provide
Distance
DME distance is the straight line distance between aircraft and ground station.
True or false
True
What is the main limitation WRT DME
Its line of sight only
What is the main function of an ils and what are its subsystems
Provide aircraft with info for a precision approach.
Localiser
Glideslope
How many CATs of ILS are there and what are they
5
Cat I Cat II Cat III A Cat III B Cat III C
The tracking tolerance laterally for the pc21 is half scale, how many degrees either side of centre track is this
1.25
The tracking tolerance vertically for the pc21 is half scale, how many degrees either side of glideslope is this
0.35
What is false glideslope
An incorrect signal recieved from the transmitter from unavoidable ground reflections
At approximately what angle would you find both the correct and incorrect glideslopes
False = 12.5° Correct = 3°
What are the 3 basic components of GPS
Sapce based
Ground network
Airborne
What are the 3 main errors ssociated with GPS signal interference
Ionoshpheric effect: severe attenuation of signal
External interference: no line of sight due to masking
Multipath effect: reflection of gps signal
What components of the pc21 are considered the navigation brains
Fms
Mc
Is the pc21 MC approved for IFR flight in aus
No
How many letter code make up the NDB IDENT
2-3
What are the 3 types of nav systems on the pc21
- radio nav syst (RNS)
- gps landing syst sensor unit (GLSSU)
- Inertial reference system (IRS)
What are the nav system related cockpit components
HUD UFCP PFD MFDs SFD FMS
What powers the tacan, nav 1, nav 2 recievers
Tacan = batt bus
Nav 1 = batt bus
Nav 2 = gen 1 bus
When the tacan/ dme function is used is in A-G mode what parameters are provided
Bearing
Range
Time to go
Ident signal for PFD, UFCP, HUD, MFD
When TACAN is in A-A mode, what parameters does it provide
Dist to nearest A-A tacan (eg another aircraft)
What is the IRS system and what is its main component
- A laser gryo inertial nav system (INS).
- inertial reference unit (IRU)
IRU is the primary sensor and supplier of what
- attitude
- direction
- acceleration
- velocities
- present position (PP)
Are there any related power or selector switches in the cockpit for the IRS
No
What powers the IRU
Gen 1 bus
Batt bus
What systems does the IRS recieve inputs from
- Air data computer (ADC)
- MC
- GLSSU
- FMS
What IRS data is displayed on PFD
Attitude Slip Rate of turn Heading Wind Gs G load
How many GLSSUs does the pc21 have. And where are they located
- Avionics bay
Where are both the GLSSU units powered from
1 = batt bus 2 = gen 1 bus
What components in the avionics bay does the RNS consist of
Nav 1 & 2 recievers
TACAN/ DME transceiver
How long does an aircraft take to align if on the ground and does this happen automatically on power up
5-17 mins
Yes
What are the 3 HSI modes
Basic compass mode
CDI
Map
The hud gives nav enroute and approach symbology. What info is displayed on the hud
Selected Nav source
TTG
Distance to DME station
What else is shown on the hud when correct ils frequency is selected
Localizer aids
Glideslope indications
Flight director (FD) box
Excessive deviation arrows
