Lecture 10: Traffic alert and Collision Avoidance System (TCAS)

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Presentation transcript:

Lecture 10: Traffic alert and Collision Avoidance System (TCAS)

Home Previous Next Help Learning Outcomes At the end of this lecture, the student should be able to: –Describe the theory of early warning system including TCAS

Home Previous Next Help What is TCAS TCAS stand for Traffic alert and Collision Avoidance System TCAS is a special system designed to reduce the incidence of Mid-air Collisions (MAC) between aircraft. According to ICAO, all aircraft with MTOW over 5700 kg or carry more than 30 passengers are compulsory to equipped with TCAS.

Home Previous Next Help Mid-Air Collision (MAC) A mid-air collision is an aviation accident in which two or more aircraft come into contact during flight. Worst MAC in History Saudi Arabian Airlines VS Kazakhstan Airlines, 1996 (349 people killed) Bashkirian Airlines collided with DHL,2002 (71 People Killed)

Home Previous Next Help TCAS Equipments TCAS Antenna TCAS Display

Home Previous Next Help HOW TCAS WORKS TCAS operates similar as Secondary Surveillance Radar (SSR), but in air to air role.

Home Previous Next Help HOW TCAS WORKS TCAS consists of antennas on aircraft body, computer processor & TCAS display inside cockpit. TCAS antenna continually surveys the airspace around an aircraft & transmit the signal. Other aircraft that also equipped with TCAS in the surrounding area will reply the signal. TCAS continuously calculates tracked aircraft position, therefore TCAS display constantly updated and provide real time position information.

Home Previous Next Help HOW TCAS WORKS Targets (other aircraft) are displayed on the TCAS screen as different symbols which show level of threat. Aircraft relative altitude also will be displayed. –Relative altitude is the targets altitude in relation to the aircraft. EX: -03↑ depicts a target 300 feet below and climbing. TCAS can not display aircraft without TCAS antenna/transponders.

Home Previous Next Help Traffic Advisory (TA) & Resolution Advisory (RA) Range = 14 NM Maximum number of aircraft processed = 30 Determination of the alerts: TA & RA AUDIO WARNING Traffic Advisory (TA) help the pilots in the visual search for the intruder aircraft, and alert them to be ready for a potential resolution advisory Intruder be at 45 and 35 seconds from the collision area. “Traffic, Traffic” Resolution Advisory (RA) avoidance maneuvers recommended to the pilot. Intruder be at 30 and 20 seconds from the collision area. “Climb, Climb” “Descent, Descent”

Home Previous Next Help TYPICAL TCAS DISPLAY

Home Previous Next Help TCAS Display In modern glass cockpit aircraft, the TCAS display may be integrated in the Navigation Display

Home Previous Next Help TCAS Advantages Highly accurate distance measurements, with a one-second refresh rate. All threats taken into account Detection of all transponding aircraft, including those which are not displayed on the air traffic controller’s screen Independent system, which acts as a last resort measure to avoid mid-air collision when other safety precautions fail. TCAS reduced the risk of mid-air collision

Home Previous Next Help TCAS Limitations No detection of aircraft without or not operating transponders (e.g. VFRs, military flights) No knowledge of the pilot’s intentions and of the ATC separation minima Basic display: no identification, no past positions, no speed vector Sometime generate unnecessary alerts.