Nav Systems Flashcards by Russel Kiellerup

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

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What are the rough ranges an NDB transmits

30 - 400nm

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The acronym MINTQC can be used to describe what

The factors which affect NDB signal transmission and enduce erros and limit range

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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

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How many signals does a VOR transmit and what are they

2
Reference phase signal
Variable phase signal

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On the pc21 one dot on the course deviation marker relates to how much deflection?

Half scale which is 5°

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Is VOR considered more accurate than NDB

Yes

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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

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What type of information does a DME provide

Distance

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DME distance is the straight line distance between aircraft and ground station.
True or false

True

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What is the main limitation WRT DME

Its line of sight only

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What is the main function of an ils and what are its subsystems

Provide aircraft with info for a precision approach.

Localiser
Glideslope

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How many CATs of ILS are there and what are they

Cat I
Cat II
Cat III A
Cat III B
Cat III C

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The tracking tolerance laterally for the pc21 is half scale, how many degrees either side of centre track is this

1.25

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The tracking tolerance vertically for the pc21 is half scale, how many degrees either side of glideslope is this

0.35

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What is false glideslope

An incorrect signal recieved from the transmitter from unavoidable ground reflections

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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

Is the pc21 MC approved for IFR flight in aus

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

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

2. 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