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to the pilot, who, with the aid of the ATC system has the primary responsibility for avoiding mid-air collisions. The TCAS
II system provides no indication of traffic conflicts with the other aircraft without operative transponders.
COMPONENTS AND OPERATION
The TCAS II system provides the following capabilities:
- Collision avoidance tracking
- Threat detection
- Threat resolution
- Communication and coordination
- Surveillance
TA and RA symbols have priority over any conflicting display space usage and will overwrite any other symbols or characters.
The TCAS II has a maximum range of 40 nm and a maximum of 32 intruders can be displayed. Four different TCAS
symbols are used on the TCAS page to represent TCAS targets. Indicators that represent the intruder’s vertical speed and
relative altitude data accompany each TCAS symbol.
Relative altitude mode is used when the altitude between own aircraft and intruder aircraft is desired. Absolute altitude
mode is used when the barometric altitude of the intruder aircraft is desired. The relative (REL) or absolute (ABS) altitude
of intruder aircraft is shown below the traffic symbols on the TCAS display. Relative altitude mode is the default mode.
Altitude is not shown for intruder aircraft not reporting altitude data. To select REL or ABS, turn the MENU switch
to position the selection box around the desired mode.
Arrows are used to indicate the vertical speed of the target aircraft. The arrow indicates that an aircraft is changing altitude
at a rate of 500 fpm or greater.
Plus or minus signs along with a number symbolizes the relative altitude of the threat airplane. Plus indicates above and
minus indicates below.
TCAS MODE SELECT
Line select buttons on the left and right sides of the TCAS CONTROL page control the following functions:
- MODE (TA, TA/RA, or STBY)
- TRAFFIC (ON/OFF)
- ALT TAG (REL/ABS)
- TEST
- EXT TEST (ON/OFF)
- ALT LIMITS (ABOVE, NORM, BELOW)
NAVIGATION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 17-01-09
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS) (Cont)
CONTROL OPERATION
TCAS modes selection and other controls are done using the FMS CDU, MFD radio menus and the DCP.
The radio menu provides basic transponder and TCAS control. The TRANSPONDER/TCAS menu provides control display
for other transponder and TCAS operations. The active beacon code, TCAS mode, and TCAS altitude limits selection
that show on the left of the TRANSPONDER/TCAS menu are identical to the TRANSPONDER/TCAS display on
the radio menu.
MFD controls using the DCP:
1. If the selection box is not displayed on the MFD radio menu, push the RADIO push button on the DCP
2. Turn the MENU knob on the DCP to position the selection box around the desired radio tune frequency/channel/
mode display.
When using the active tune method the frequency color changes from green to white. Active tuning is used for transponder
beacon code selection. Usually radio control other than frequency/channel tuning is done on the radio’s sub menu. Radio
control uses the selection box method as follows:
1. Repeat steps 1 and 2 above to position the selection box within the display for the desired radio on the MFD radio
menu.
2. Push the RADIO push button and the sub menu for the selected radio will replace the top level menu. (The process
of tuning on the MFD radio sub menu is identical to tuning on the MFD radio menu).
3. Turn the MENU knob to position the selection box around the desired radios control.
4. Turn/push the DATA knob on the DCP to select the desired state of the selected control
The selection box returns to its MFD main radio menu home position after 20 seconds of no activity on the sub menu or by
again pushing the RADIO (on the DCP) push button again. Pushing a menu push button will replace the sub menu with the
top level menu and operate as required for the push button. The selection box is immediately positioned around the tune
frequency/channel display on the sub menu and frequency/channel is tuned if the TUNE knob is turned, or the " knob is
pushed.
The beacon code entry uses active tuning control operation and any code may be entered between 0000 and 7777. The
IDENT switch is located on both control wheels and stays active for approximately 18 seconds when pushed.
The TRANSPONDER/TCAS mode selection and annunciation is on the TRANSPONDER/TCAS radio primary display
page on the MFD and on the TRANSPONDER/TCAS control radio submenu. Selections are as follows:
- When using the DATA button the possible mode selections in order of succession are STBY, TA/RA, TA ONLY,
ALT ON, ALT OFF. The order reverses if the DATA knob is turned counterclockwise
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