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General. The TCAS computer transmits interrogations to and receives



The TCAS computer transmits interrogations to and receives

replies from other airplanes. Airplanes that are tracked by

TCAS are called targets. The TCAS computer uses these

replies and data from other airplane systems to calculate if a target is a collision threat. The TCAS computer can communicate with other airplanes that have TCAS. The two TCAS computers can use the shared data to perform coordinated maneuvers and avoid potential collisions.

The TCAS computer also gets analog and digital inputs from other airplane systems. These inputs control TCAS and provide data for TCAS to track intruders. The TCAS computer sends display data to the common display system (CDS) display electronic units (DEUs).

The TCAS computer has these circuits:

· Input/output (I/O)

· Speech Processor

· Central processing unit (CPU) and memory

· Suppression circuit

· Signal Processor

· Receiver

· Transmitter

· Beam steering and attenuator

· BITE.

I/O

The I/O circuit gets this on-board airplane systems data:

· Magnetic heading data from the left ADIRU

· Coordination and control data from the ATC transponder system

· Barometric altitude from the left or right ADIRU from the

active ATC

· Radio altitude from the radio altimeters

· Resolution advisory status from the DEUs

· Landing gear down discrete from the landing gear lever

switch

· Aural inhibit discrete interface with the GPWC

· Aural inhibit discrete interface with the weather radar

· Air/ground data from the PSEU.

Program pins set these parameters in the TCAS computer:

· Altitude limits

· Aural warning volume levels

· Self test inhibits

· Standby on ground

· Intruders on ground disabled.

The I/O circuits send this data to the CPU.

CPU

The CPU gets the data from the inputs of the I/O and puts it into

memory. The CPU combines the input data and the data it

receives from the signal processor. The CPU makes the

necessary calculations for the TCAS displays and aural

messages.

The CPU sends TCAS display data to the CDS DEUs. It shows on these indicators:

· Attitude indicators (AI)

· Navigation display (ND)

The CPU sends the display data to the flight data acquisition unit (FDAU).

It also sends signals through the speech processor circuits to the REU to make TCAS aurals.





Дата публикования: 2014-11-28; Прочитано: 313 | Нарушение авторского права страницы | Мы поможем в написании вашей работы!



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