3a E-TCAS Flashcards
The purpose of this is to reduce or eliminate mid air collisions
E-TCAS
What are the two main functions of E-TCAS
Collision surveillance and collision avoidance
There are 2 types of CAS-
This type will NOT work in a non-radar environment
Passive
There are two types of CAS-
This one actively interrogates and WILL work in a non-radar environment
Active
What are the 3 Types of TCAS systems?
TCAS 1
TCAS 2
E-TCAS
This TCAS system displays traffic situation and auditory warnings
TCAS 1
This TCAS system has the same characteristics as another system plus resolution advisories, auditory and visual maneuvers
TCAS 2
This TCAS system also has the same characteristics as another system plus range extension
E-TCAS 
There are 8 functions of the TCAS, this one detects presence, determines initial range, relative bearing, relative altitude
Surveillance function
Display volume has 3 displays-
Above, normal, below
What do each mean?
Above- small volume below, larger above
Normal- centered on own aircraft
Below- large volume below, small volume above
This function tracks up to 45 aircraft but only displays 30 that have the highest threat potential
Tracking function
This function is based on intruder range divided by range rate
Threat potential evaluation function
This function determines appropriate vertical maneuver
Azimuth maneuvers are not generated
Collision avoidance computation function
This function has a minimum safe distance that alerts you at 35 seconds
Resolution advisory
This function depicts position and threat potential
48 seconds 
Traffic advisory
This function coordinates movement via the Mode S transponder
Air to air coordination function
This function uses synthesized audio announcements
Aural Alert Function
This mode monitors +/- 8,700ft in vertical plane. Up to 30NM forward, 15NM from the aft, and 20NM to the sides 
NORM 
This mode monitors +/- 12,700ft in vertical plane (-4000ft below) and has up to 40NM in all directions
EXT RANGE
The rate at which the altitude is increasing or decreasing
Vertical speed
This is how fast intruder is closing in on your position
Closure rate 
This is determined by comparing your barometric altitude to the barometric altitude reported by the intruders transponders mode-C or mode-S reply
Intruder altitude
What are the two indicators for TCAS
VSI & MFD
VERTICAL SPEED INDICATOR
MULTIFUNCTION DISPLAY
This is a yellow circle that shows an intruder is nearby within 48 seconds
Traffic advisory
This is a red square which means a nearby threat is within 35 seconds
Resolution advisory
What are the components of the TCAS?
Processor Directional antenna Antenna cabling TCAS/VSI MFD
This controls all surveillance, data acquisition.
Transmits 1030 MHz, receives 1090 MHz
 E-TCAS processor
This is divided into four quadrants and can be found on top of the aircraft and on bottom
Directional antenna
There are a set of four of these which connects the antennas to the TCAS processor
Antenna cabling
These are not repairable and will need to be purchased if damaged
Cables
This provides the pilot and copilot with a constant Visual display of vertical speed, E-TCAS traffic, resolution advisories
VSI
This indicator is used to enable the pilot or copilot MFD control command of center
Pilots control overrides copilots control
MFD
This is used to control and monitor various functions
CDU
