(6)
Display on the PFD A red TCAS flag appears to the left of the vertical speed scale on the PFD if the TCAS cannot deliver RA data. (Ref. Fig. 030)
(7)
Display on the upper ECAM DU
-If a TCAS fault is detected, the amber warning message NAV TCAS FAULT is displayed on the upper ECAM DU.
-Selection of the TCAS STBY mode on the ATC/TCAS control unit results in the display of the TCAS STBY message (green) in the memo section of the upper ECAM DU. (Ref. Fig. 030)
H. ATC/TCAS Control Unit Operational Use The TCAS is a cooperative system whose operating mode is very close to the ATC Mode S transponder associated to it. The main controls are thus grouped on the ATC/TCAS control unit and the traffic and conflict resolution information is presented on the EFIS displays.
NOTE : - Operation of the ATC Mode S transponder is described in 34-52.
____
-The EFIS components are also described in 31-64 for the PFD and 31-65 for the ND.
The manual operating modes of the TCAS are selected via the ATC/TCAS control unit
(Ref. Fig. 031)
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TCAS - Sector Displays on Vertical Speed Scale Figure 028
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TCAS - Messages Displayed on ND Figure 029
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TCAS - Messages Displayed on PFD and ECAM Figure 030
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TCAS - ATC/TCAS Control Unit Figure 031
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(1) TCAS modes of operation The TCAS mode of operation is selected by means of two selectors switches.
-STBY, TA and TA/RA
-THRT, ALL, ABV and BLW
(a)
STBY mode In the Standby Mode, the advisory generation and surveillance functions are inhibited. No TCAS information can be displayed on the PFDs and NDs. The aircraft symbol and the range ring remain on the ND and vertical speed information is not displayed on the PFD. The green TCAS STBY message is displayed in the memo section of the upper ECAM DU. If the mode selector is set to XPDR, the TCAS also operates in standby mode.
(b)
TA mode In this mode, intruders are displayed on the ND according to their position in the airspace. The RA type intruder symbols are converted into TA type symbols. The TCAS performs surveillance functions but does not generate any resolution advisories. The TA ONLY message is displayed in white on the NDs in the left corner of the TCAS message area.
(c)
TA/RA mode The TCAS performs all TA mode functions and also issues preventive or corrective resolution advisories, represented in the form of colored sectors along the vertical speed scale on the PFD. The sensitivity level is determined automatically in function of altitude.
NOTE : The final mode of operation is a combination taking into
____ account the aircraft altitude and any instructions received from ATC Mode S ground stations. For further information refer to the priority logic definition (Ref. Para. 6.F.).
(d)
THRT mode
In this mode, TCAS intruders (proximate or/and other) are
displayed if a TA or a RA is already displayed.
(e)
ALL mode This selection enables display of all intruders without any conditions (TCAS intruders are displayed when detected).
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(f) ABV and BLW modes This selection controls the above and below vertical altitude for traffic advisory:
-ABV: altitude range is set to 9900 ft above the aircraft and 2700 ft below
-BLW: altitude range is set to 9900 ft below the aircraft and 2700 ft above.
(2)
ATC mode of operation The mode of operation of the transponder is selected by a switch with three positions STBY, AUTO, ON.
(a)
STBY mode When the transponder is in standby it does not transmit either squitters or replies to ground station or other aircraft interrogations.
(b)
AUTO mode In flight, the aircraft operates as in the ON mode: all its functions are active. When the aircraft touches down, the landing gear ground/flight relay disables the Mode A and C replies of the selected transponder from ground station interrogations. However the Mode S replies and squitter are not inhibited when the A/C is on the ground.
(c)
ON mode The Mode S transponder operates permanently, both in flight and on the ground. It periodically transmits squitters (at 1 second intervals) to be detected by other aircraft and replies to their interrogations and those from ground stations. This function permits, on ground, to override the inhibition of replies from interrogations in Mode A or C. It is used by the air traffic controller to check the correct operation of the aircraft Mode A or C transponder prior to takeoff.
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