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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-027
WXR SYSTEM - SYSTEM SUMMARY
WXR SYSTEM - SYSTEM SUMMARY
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-027
General
The traffic alert and collision avoidance system (TCAS) helps
the flight crew maintain safe air traffic separation from other
ATC transponder equipped airplanes. TCAS is an airborne
system and operates independently of the ground-based ATC
system.
TCAS sends interrogation signals to nearby airplanes. These
airplanes which are equipped with an air traffic control radar
beacon system (ATCRBS) transponder or an air traffic control
(ATC) mode S transponder respond to these interrogations.
TCAS uses these response signals to calculate the range,
relative bearing, and altitude of the responding airplane. If a
responding airplane does not report altitude, TCAS cannot
calculate the altitude of that airplane. Airplanes tracked by
TCAS are called targets.
Using the information from the response signals and altitude of
own airplane, TCAS calculates the relative movement between
own airplane and the target. TCAS then calculates how close
the target will be to own airplane at the closest point of
approach (CPA).
Targets are classified as one of these four types depending on
the separation at CPA and the time it will take until CPA occurs:
* Other traffic
* Proximate traffic
* Intruders
* Threats.
Each type of target has a different symbol on the display.
If the separation at CPA is within certain limits, TCAS provides
advisory messages to the flight crew. TCAS provides two levels
of advisories to the flight crew, traffic advisory (TA) and
resolution advisory (RA). The type of advisory is determined by
a combination of altitude, the time to CPA, and the separation at
CPA. The TA shows for relatively longer times to CPA and
relatively larger separation at CPA and is for intruder targets.
The RA shows for relatively shorter times to CPA and relatively
smaller separation at CPA and is for threat targets.
The TA shows the range, bearing, and relative altitude (if
relative altitude is known) of the intruder target. The RA also
gives visual and aural commands to the flight crew to make
sure there is safe vertical separation from the threat target.
TCAS also communicates with other airplanes that have TCAS
to coordinate the flight movement to prevent a collision.
Abbreviations and Acronyms
* abs - absolute
* abv - above
* ADIRU - air data inertial reference unit
* AGL - above ground level
* AI - attitude indicator
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM - INTRODUCTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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* ant - antenna
* arpt - airport
* ATC - air traffic control
* ATCRBS - air traffic control radar beacon system
* BITE - built-in-test equipment
* blw - below
* CDS - common display system
* CPA - closest point of approach
* CPU - central processing unit
* CTR - center
* DEU - display electronics unit
* DME - distance measuring equipment
* EFIS - electronic flight instrument system
* exp - expanded
* FDAU - flight data acquisition unit
* FL - flight level
* FPM - feet per minute
* fwd - forward
* gnd - ground
* GPWC - ground proximity warning computer
* grd - ground
* ident - identification
* IF - intermediate frequency
* INT - interrogator
* I/O - input/output
* L - left
* LED - light emitting diode
* max - maximum
* MHz - megahertz
* NCD - no computed data
* NM - nautical miles
* norm - normal
* R - right
* RA - resolution advisory
* rel - relative
* REU - remote electronic unit
* RF - radio frequency
* R/T - receiver/transmitter
* stby - standby
* sw - switch
* TA - traffic advisory
* TAS - true airspeed
* TAU - time to closest point of approach
* TCAS - traffic alert and collision avoidance system
* tfc - traffic
* trk - track
* VOR - very high frequency omnidirectional range
* VSI - vertical speed indicator
* wpt - waypoint
* xfr - transfer
* xpndr - transponder
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM - INTRODUCTION
EFFECTIVITY
　
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