37 radio nav aids

Question 1

ADF

Answer 1

Major components: ADF Receiver, antennae and a bearing indicator (RMI)
The NAVAIDs used with the ADF system are called non-directional Beacons or NDBs

Question 2

ADF accuracy

Answer 2

Accuracy:
+/- 3° is the 1CFFTS accepted standard error (±30° under poor conditions)
Range: up to 200nm (200kHz) – 50nm (1600kHz) decreases at night (sky-wave contamination)

Question 3

ADF on the CT-142: King 806 ARC

Answer 3

Components:
Radio compass receiver – avionics rack
CDU
Antenna assembly – underside of fuselage just forward of main gear
Bearing indicators (pilot, co-pilot, ACSO consoles)
Operating Freq Limits: 190.0 – 1799.0kHz
Absent or muted audio indicates that the selected frequency is too weak for the dependable navigation, or FMS is in Aux Mode

Question 4

VOR

Answer 4

VHF Omni directional Range
Measures the phase difference between two radio signals
Provides radials in degrees oriented to magnetic, True or Grid North

Question 5

VOR Freq

Answer 5

VHF: 
108.00 MHz – 117.95MHz with 50 KHz spacing
ILS Freqs:
108.10 – 111.95 Localizer (VHF)
330.95 – 334.70 Glideslope (UHF)

Question 6

VOR accuracy

Answer 6

Accuracy:
Theoretical accuracy ±2° - 5° (1CFFTS ±2.5°)
Line of sight
Affected by a variety of site effects
Echoes from hills, buildings
Magnetic anomalies
80°cone of confusion

Question 7

TACAN

Answer 7

Broken part into 2 parts
Radial (azimuth) calculation
DME (Distance) calculation

Question 8

TACAN and DME – Capabilities and limitations

Answer 8

Range line of sight (UHF)
Maximum of 252 users, consists of 126 mode X and 126 mode Y channels
A cone of confusion can vary from 60° - 110° across depending on the ground site
Bearing accuracy ±3/4°
DME is slant range, accurate ±1nm
TACAN are normally aligned to magnetic north in SDA and true north in NDA