SYS 205/206 - Nav Systems and GPS Flashcards
What processes the VOR/ILS signals received by the antennas located on the vertical fin and bottom of fuselage?
Remotely mounted nav receiver in the right avionics bay
VOR stations transmit azimuth signals through 360° in 1° increments called what and referenced to where?
Radials; magnetic north
What does a VORTAC provide?
VOR radial, TACAN radial (not able to be displayed on T-6A), TACAN distance (DME)
VOR signals are subject to what restrictions?
Line-of-sight 🡪 altitude, terrain
What does a freq pairing scheme mean for VOR/DME or VORTAC?
Turning the VOR freq automatically tunes the DME receiver to the paired DME /TACAN freq to receive distance information
Where on the T-6A does the VOR detect radial signals?
Combination NAV/GS/ILS antennas mounted on each side of the vertical stabilizer
The ILS system is composed of what 3 distinct signals
Localizer: 108.10 – 111.95 MHz
GS: 329.15 – 335.00 MHz
Marker beacons: 75 MHz
Where is the marker beacon located, and what processes the marker beacon signals?
Antenna = bottom of fuselage just in front of the vertical fin; processed by nav receiver in the right avionics bay
When does the EHSI switch to LOC?
When localizer freq is made primary on RMU
How does the EADI change when localizer freq is made to primary RMU?
GS/localizer scale/deviation; marker beacon
DME measures what?
Slant range from station to aircraft
Where is the DME antenna & receiver?
Bottom of the aircraft in front of marker beacon; right avionics bay
What does DME HOLD do?
“Hold” DME freq w/ currently selected primary station 🡪 new freq becomes primary guidance, old gives DME
TAS tracks aircraft w/in what ranges?
40 NM radius, 10,000 ft above/below the aircraft
What are the TAS limits for NORM?
±2700 ft
What are the TAS limits for ABV?
+8700 ft, -2700 ft
What are the TAS limits for BEL?
-8700 ft, +2700 ft
How far up do the range selections go on the TAS?
3, 5, 10, 20, and 40 NM 🡪 measured from symbol to top of VSI circle
What is the radius of the green ring on the TAS?
2-mile radius
Where is the TAS processor, and where does it get its data?
Left avionics bay; altitude/airspeed from ADC, heading data from AHRS, present position from GPS
What does a solid white diamond on the TAS indicate?
Proximity traffic w/in ±1200ft and w/in 5 NM range, but not a threat
Where does the T-6A receive the GPS signal?
Antenna located at the top front edge of the vertical stabilizer
When can either GPS unit be used?
When FCP unit is on and functioning
How many flight plans can the GPS store?
Up to 25 w/ up to 30 waypoints each
What is the active flight plan?
FPL 0
What are the 5 types of waypoints in the GPS?
APT, VOR, NDB, INT, SUP (first 4 in published database)
How many airport pages are there on the GPS?
8
What does a “+” indicate for a GPS page?
Sub-pages available
What is MSA (min safe alt)?
Altitude to clear all terrain w/ one degree of latitude/longitude (approximately 3600 sq miles)
What is the clearance for terrain 5,000ft MSL or lower?
1000 ft
What is the clearance for terrain 5,001ft MSL or higher?
2,000ft
What is Enroute Safe Altitude (ESA)?
Highest MSA from present position on course to the active waypoint
If TEST FAIL replaces ANNUN ON, how many times can the test be tried before rejecting the unit?
One More Time
