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TCAS - BASIC OPERATION
TCAS - BASIC OPERATION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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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General
The TCAS tracks and evaluates up to 30 airplanes that are in the
surveillance area. Airplanes in the surveillance area are put
into one of these four groups:
* Resolution advisory (RA) group
* Traffic advisory (TA) group
* Proximate traffic
* Other traffic.
TCAS has a maximum surveillance area that is 8700 feet above
and below your airplane. It has a range of 40 nm.
RA and TA Groups
The TCAS forms two protected areas around its own airplane.
The dimensions of these protected areas change with airspeed
and altitude of the TCAS airplane and the closure rate of the
target.
The protected area represents the time until the target will be at
the closest point of approach (CPA) to the TCAS airplane. This
protected area is called the TAU area.
To calculate the TAU, the TCAS computer uses this data:
* Own airplane altitude
* Target closure rate
* Target range and altitude.
Traffic advisory TAU and resolution advisory TAU define areas
around the TCAS airplane that, if penetrated by a target within
the required altitude restrictions, would produce the
appropriate warning from the TCAS computer.
The TCAS computer uses six sensitivity levels (2-7). Level 7 is
the most sensitive. At level 2, no resolution advisories may
occur. Below 1000 feet, level 2 is used and above 20000 feet,
level 7 is used. Sensitivity levels are set by the TCAS computer
based on own airplane altitude.
The TA and RA times vary with sensitivity level. At sensitivity
level 3, RA TAU is 15 seconds while at sensitivity level 7, RA
TAU is 35 seconds.
Proximate Traffic and Other Traffic
Proximate traffic is an airplane with a relative altitude
separation less than 1200 feet, is in a 6 nm radius of your
airplane, and is not a TA or RA threat.
Other traffic is an airplane with a range more than 6 nm that is
not a TA or RA threat. If the range is less than 6 nm, the relative
altitude must be more than 1200 feet.
TCAS - SURVEILLANCE AREA
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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TCAS - SURVEILLANCE AREA
TCAS - SURVEILLANCE AREA
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-45-00-013
General
The EFIS control panel and the ATC control panel control the
TCAS data that shows on the displays.
EFIS Control Panel
To show the TCAS data on the display, put the mode selector on
the EFIS control panel in one of these modes:
* Expanded approach
* Expanded VOR
* Expanded map
* Centered map.
The range selector selects the range for the ND.
Push the TFC (traffic) switch on the range selector to let the ND
show the TCAS data. When you do this, the TFC message and
the TCAS symbols of any targets show on the display.
If the function selector on the ATC control panel is not in the TA
or TA/RA position, the display does this:
* Shows an amber message, TCAS OFF (TCAS OFF shows in
all ND modes)
* Removes all TCAS target symbols.
To remove the TCAS messages and symbols from the display,
push the TFC switch again.
ATC/TCAS Control Panel
The ATC/TCAS control panel sends control data through the
ATC Mode S transponder to the TCAS computer. The TCAS
computer sends this data to the DEU for display.
The function selector puts the TCAS computer in the TA only or
TA/RA mode. In the TA only mode, the TCAS does not supply
RA traffic symbols or advisories. It also does not supply RA
aural messages. The function selector can also put the TCAS
computer in the test mode.
The ND shows the relative altitude of the target above or below
the symbol.
TCAS - CONTROL AND DISPLAY
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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TCAS - CONTROL AND DISPLAY
TCAS - CONTROL AND DISPLAY
EFFECTIVITY
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