(3)
Altitude reporting
(a) OFF position Selection of the ALT RPTG switch OFF position has the following results:
-
the Mode S transponder continues to transmit squitters and replies to Mode A, C and S interrogations but does not report altitude.
-
the TCAS switches to STBY (TCAS STBY message in green on the upper ECAM DU),
-
the PFD and ND display corresponds to the standby mode.
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(b) ON position The active transponder replies to interrogations and reports its altitude. The TCAS operates in the mode selected by its logic in function of information input from the control unit, ATCRBS/MODE S ground stations and in function of aircraft altitude.
(4)
Selection of system 1/2 active transponder The 1/2 switch permits selection of the active transponder. The non-selected transponder is placed in standby.
(5)
Identification code in Mode A The Mode S transponder also replies to Mode A interrogations from ground stations. A keyboard permits the pilot to set the Mode A octal code assigned to the aircraft by the ATC ground station controller and included in the transmitted replies. A window on the control unit displays this code permanently as long as the content of the digital output message complies with the displayed data.
(6)
IDENT pushbutton switch On ground station request, an addition pulse must be included in the Mode A and Mode C replies transmitted by the transponder to enable a more precise location. This operation is performed by pressing the IDENT pushbutton switch on the control unit.
7. Test
____
R **ON A/C 001-049, 101-105, 151-199,
A. Self-Test A quick check of the correct operation of the TCAS installation can be performed by activating the TEST function:
-either by pressing the pushbutton switch on the front of the TCAS computer - or through the CFDIU by applying the procedure TCAS functional test on
the MCDU. The self-test sequence checks the main functions of the computer and transmits to the displays:
-resolution advisory characteristics (0 ft/mn advisory, up corrective advisory, don't descend, don't climb > 2000 ft/mn, rate to maintain) on label 270
-label frames 130, 131, 132 containing the data for each of the four intruders according to the following table:
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--------------------------------------------------------------------------
| INTRUDER | TYPE | RANGE | REL ALT | BEARING | VERTICAL RATE | | | | (NM) | (FEET) | (DEG) | | |------------|--------|---------|-----------|-----------|----------------| | 1 | RA | 2.00 | -1000 | +90 |no vertical rate| | 2 | TA | 2.00 | -200 | -90 |climbing | | 3 | PROX | 3.625 | +200 | +33.75 |descending | | 4 | OTHER | 3.625 | +1000 | -33.75 |no vertical rate| --------------------------------------------------------------------------
(1)
ND image The ND must display the images corresponding to the four types of intruders: Other, Proximate, TA and RA. The shapes and colors of the traffic symbols are:
-
white outlined diamond for Other traffic
-
white diamond for Proximate traffic
-yellow circle for TA traffic
-red square for RA traffic
(Ref. Fig. 032)
(2)
PFD image At the beginning of the test sequence, the vertical speed scale on the PFD is divided in three sectors: one green and two red ones. Then a resolution advisory display is shown. (Ref. Fig. 032)
(3)
Fault indication At the end of the test sequence, the system generates a synthesized voice message:
TCAS SYSTEM TEST OK
if the system operates correctly or:
TCAS SYSTEM TEST FAIL
if an anomaly has been detected. In this case the NDs, the PFDs and the ECAM show the fault messages described in Para. 6.G.(5), (6) and (7). In addition, two windows on the front of the TCAS computer display a code identifying the failed component according to the table below:
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TCAS - Test Display Figure 032
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----------------------------------------
| CODE | COMPONENT |
|----------|---------------------------|
| TP | TCAS PROCESSOR |
| T1 | TOP ANTENNA ELEMENT E1 |
| T2 | TOP ANTENNA ELEMENT E2 |
| T3 | TOP ANTENNA ELEMENT E3 |
| T4 | TOP ANTENNA ELEMENT E4 |
| B1 | BOTTOM ANTENNA ELEMENT E1|
| B2 | BOTTOM ANTENNA ELEMENT E2|
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