mode a, c, and s surveillance

tcas algorithms classify intruders into one of 4 discrete levels:

intruder, threat, proximate traffic, or other traffic

An Intruder is an aircraft that satisfies TCAS __ ____ advisory detection critera

II, traffic

A Threat is an intruder aircraft that satisfies the ______ logic and thus requires a ____

threat detection, RA

Proximate traffic is aircraft that are within ____ in range and ______ vertically from interrogation aircraft, but do not meet the _____ of a TA or RA

6 NM, ±1,200 feet, TCAS II

Other traffic is classified as traffic more than ______ vertically or ______ from interrogation aircraft that are neither RA nor TA

±1,200 feet, 6 NM

To project an aircraft’s position into the future, the system performs a simple ____ extrapolation based on the aircraft’s estimated _______.

linear, current velocity

The algorithm then uses several key metrics to determine whether an intruder is a threat, including the estimated ______ separations and the time until the _______ between aircraft

vertical and slant range, closest point of approach

Time criterion refers to the _______ between the aircraft. It is how fast the aircraft _______.

rate of closure, are flying towards each other

TCAS considers the green area to be a safe zone as ______ exists.

sufficient spacing

TCAS provides a ___ if an aircraft enters yellow area as the system senses the intruder aircraft is ______.

TA, within the safe zone

TCAS provides a ___ if an aircraft enters pink area as the system senses the intruder aircraft is ______.

RA, a threat

If a threat is present, and the intruder aircraft has a _____ transponder, a display in the cockpit shows the aircraft’s range, bearing, and _____, with an arrow indicating whether the intruder is climbing or descending.

Mode C or S, relative altitude

If the intruder is within certain ____ limits, the display shows an icon that alerts the flight crew that traffic is near but not yet a threat.

lateral and vertical

A TA is issued in the cockpit if the intruder aircraft has a ______ transponder and a collision is predicted to occur within the next _____ (depending on altitude)

Mode C or S, 20 to 48 seconds

TCAS issues an RA ______ before a potential collision (depending on altitude), with a spoken message and a graphical display of the target _____ for the aircraft.

15 to 35 seconds, vertical rate of climb or descent

When both the intruder and interrogation aircraft are equipped with _____, the two systems will coordinate with each other and select complementary ___.

This ensures that if one aircraft climbs, the other will descend.

TCAS II, RAs

Intruder aircraft _______ are invisible to TCAS-equipped aircraft, so TAs and RAs are not provided.

without transponders

Intruder aircraft equipped with only a Mode A transponder can be tracked or detected by TCAS II

False

Intruder aircraft equipped with only a Mode A transponder cannot be tracked or detected by TCAS II because TCAS II does not use _____. Therefore, Mode A transponder aircraft are _____ to TCAS-equipped aircraft.

Mode A interrogations, invisible

Intruder aircraft equipped with a Mode C transponder without altitude input will be tracked as a _______. Neither a data tag nor a _____ will be shown with the traffic symbol.

non-altitude replying target, trend arrow

Intruder aircraft equipped with a Mode C transponder without altitude input are deemed to be _____ as interrogation aircraft.

at the same altitude

In an encounter between two TCAS II-equipped aircraft, the two computers will communicate using the Mode S transponder ______, which has the capability to provide _______.

data link, complementary RAs

TCAS I has a RA display that indicates whether the pilot should initiate a climb or descent, as well as the vertical rate of climb or descent that must be achieved to increase separation from threatening aircraft.

False

Which of the following depicts the position of traffic relative to aircraft equipped with TCAS?

Traffic advisory (TA) display

TCAS uses a threat-detection algorithm to classify intruders into ____ levels.

four

If the intruder aircraft has a Mode C or S transponder, a display in the cockpit shows the aircraft's range, bearing, and relative altitude, with an arrow indicating _____.

whether the intruder aircraft is climbing or descending