(b) Discrete form The ADR provides seven standard OPEN/GROUND output discretes (Ref. table 17).
--------------------------------------------------------------------------| SIGNAL | PIN | OUTPUT | DEFINITION | |------------------------------|------------|-------------|--------------| | ADR OFF Status | TP- 4E | OPEN/GROUND | ON/OFF | | ADR FAULT | TP- 4D | OPEN/GROUND | NO/FAULT | | Low Speed Warning Discrete 1 | TP- 2F | OPEN/GROUND | SLOW/FAST | | Low Speed Warning Discrete 2 | TP- 2G | OPEN/GROUND | SLOW/FAST | | Low Speed Warning Discrete 3 | TP- 6F | OPEN/GROUND | SLOW/FAST | | Low Speed Warning Discrete 4 | TP-13H | OPEN/GROUND | FAST/SLOW | | AOA Special Test | TP-12G | OPEN/28VDC | NO/TEST | --------------------------------------------------------------------------
Table 17 - ADR - Discrete Output Signals
1 ADR OFF Status
_ When the ADR is commanded OFF, it issues a ground state to the ADR OFF light discrete to enable the legend to come on.
2 ADR FAULT
_ When an ADR FAULT is detected, the ADR issues a ground state to the ADR FAULT discrete to enable the legend to come on.
3 Low speed warning discretes 1, 2, 3, 4
_ The ADR provides four standard Open/Ground low speed-warning output discretes.
-Airspeed conditions Airspeed decreasing Discrete 1 = OPEN for Airspeed less than or equal to 100 knots Discrete 2 = OPEN for Airspeed less than or equal to 50 knots Discrete 3 = OPEN for Airspeed less than or equal to 155 knots Discrete 4 = GROUND for Airspeed less than or equal to 260 knots Airspeed increasing Discrete 1 = GROUND for Airspeed greater than 104 knots Discrete 2 = GROUND for Airspeed greater than 54 knots Discrete 3 = GROUND for Airspeed greater than 159 knots Discrete 4 = OPEN for Airspeed greater than 264 knots
-Power off conditions
Discrete 1 = OPEN
Discrete 2 = OPEN
Discrete 3 = OPEN
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-13-00Page 30 1 1 Config-1 May 01/05 1 1 1CES 1 Discrete 4 = OPEN
-CAS detected failure condition
Discrete 1 = previous state
Discrete 2 = previous state
Discrete 3 = previous state
Discrete 4 = OPEN
4 AOA special test
_ The ADR provides an OPEN/GROUND output discrete to drive the AOA self-test. The AOA self-test is commanded via the CFDS interface bus. When the AOA test is active, the AOA sensor is offset to +15 deg. (plus or minus 1 deg.). All AOA dependent parameters reflect this offset and their SSMs indicate Functional Test (FT). The RETURN command from the MCDU results in the discrete output set to OPEN. Ref. 34-18-00 for more details.
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-13-00Page 31 1 1 Config-1 May 01/05 1 1 1CES 1
3. Operation/Control and Indicating
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A. Control
(1) ADIRS Control and Display Unit (CDU) (Ref. Fig. 002) The ADIRS CDU provides the control and warning of the three ADRs by means of three ADR illuminated pushbutton switches:
-the pushbutton switch is used to disable the ADR output buses. It is a momentary action pushbutton switch
-
when the ADR output buses are disabled, the ADR controls the activation of the ADR OFF legend by its output discrete: ADR OFF status
-
when an ADR failure is detected, the ADR controls the activation of the ADR FAULT legend by its output discrete: ADR FAULT
-each ADR is de-energized when the associated OFF/NAV/ATT selector switch is set to OFF
-when the associated OFF/NAV/ATT selector switch is set to NAV or ATT, each ADR is switched on independently of the previous selection on the ADR pushbutton switch.
B. Indicating Altitude (ALT), Computed Airspeed (CAS), Mach number (M) and Vertical Speed (V/S) are computed by the ADIRU (ADR portion), processed by the associated DMC and displayed on the PFDs. True Airspeed (TAS) is supplied in the same way but is displayed on the NDs. In normal configuration, with the AIR DATA selector switch in NORM position, the ADR 1 displays information on CAPT PFD and ND. The ADR 2 displays information on F/O PFD and ND. Static Air Temperature (SAT) and Total Air Temperature (TAT) are also supplied in the same way but are permanently displayed on the lower part of the lower ECAM DU. These items of information are displayed by the ADR 2.
(1) PFD display For further details concerning speed, altitude or vertical speed scale, Ref. 31-64-00.
(a) Computed Airspeed (CAS) (Ref. Fig. 003) The CAS indication is displayed in analog form by means of a white tape with graduations every 10 kts and digital values every 20 kts. This tape moves up and down so as to indicate the A/C actual speed value in front of a fixed yellow reference line.
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