R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-13-00Page 8 1 1 Config-1 May 01/05 1 1 1CES 1 10 Baro Port A discrete

__ The ADR uses this discrete to select which ARINC 429 port is used as a source for all baro-correction input data. If this discrete is grounded, the baro port A is selected. If this discrete is open, the baro port B is selected. The A/c is wired with this discrete grounded (Ref. Dual Baro discrete).
 11 Dual Baro discrete
__ The ADR uses this discrete to select which ARINC 429 port is used as a source for all baro-correction input data. If this discrete is grounded, the baro port A and the baro port B are selected and the baro port A discrete selection is overriden. If this discrete is open, the baro port A or the baro port B is selected depending on the baro port A discrete selection. The A/C is wired with this discrete open.
 12 Zero MACH SSEC discrete
__ The ADR uses this discrete to select the SSEC as a function of Mach. When this program pin indicates Use SSEC (open), the SSEC as a function of Mach is computed. When this program pin indicates Ignore SSEC (ground), the ADR uses zero correction. The A/C is wired with this discrete open.
 13 Zero AOA SSEC discrete
__ The ADR uses this discrete to select the SSEC as a function of angle of attack. When this program pin indicates Use SSEC (open), the SSEC as a function of AOA is computed. When this program pin indicates Ignore SSEC (ground), the ADR uses zero correction. The A/C is wired with this discrete open.
 14 AIR FRM ID Code discrete
__ The ADR uses input discretes to identify the aircraft (type, engine model) on which the ADIRU is fitted, and to select the appropriate set of correction laws for Static Source Error Correction (SSEC) and AOA corrections. The ADIRU memory has the capacity to store 128 different sets of laws. To perform this coding, the ADR wires seven input discretes and one discrete for parity to a common.
 15 ADR Remote Test discrete
__ The ADR uses one discrete to select the remote test by external control. When this discrete is open, the test is not activated. When this discrete is grounded, the test is activated.
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-13-00Page 9 1 1 Config-1 May 01/05 1 1 1CES 1

 The A/C is wired with this discrete open (unused).
 The test is activated via the CFDIU (Ref. 34-18-00).

 16 ADR OFF DISCR input discrete
__ The ADR uses this discrete input to toggle its state between ON and OFF at each press on the momentary contact switch. When the ADR is OFF, the output buses are disabled and the ADR FAULT annunciator is inhibited (reset if already set).
 17 Baro Analog/Digital Sel discrete
__ The ADR uses this discrete to select either the analog or digital baro correction. When this discrete is grounded, the analog baro correction is selected. When this discrete is open, the digital baro correction is selected. The A/C is wired with this discrete open.
 18 Baro Corr 3 Active discrete
__ The ADR uses this discrete to determine for BITE purposes whether the baro correction 3 is connected or not. When the discrete is grounded, the baro correction 3 is connected. When the discrete is open, the baro correction 3 is not connected. The A/C is wired with this discrete open.
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-13-00Page 10 1 1 Config-1 May 01/05 1 1 1CES 1 (3) Acquisition and processing of the sensor inputs

 (a) Pressure computation Based on pressure data received from the ADM (Ref. para. 2.A.(2)(a)1), the software converts the pressure inputs into corrected pressure data. From the average static pressure (Psm), the software calculates the corrected static pressure based on the SSEC factor:
 ( G1 G2 ) Psc = Psm (1 + ---- + ----) ( 1000 1000)
 -G1 depends on flaps and Mach is interpolated in a table (2 flaps position and 19 Mach values are considered)
 -G2 depends on Mach and AOA corrected and is interpolated in a
 table (6 AOA values and 19 Mach values are considered). The correct SSEC factor depends on the sensor location and on the aircraft configuration. The ADR memory contains several tables and the appropriate one is selected according to the following input discretes:
 . SDI . aircraft Ident . SSEC Alternate.
 Two input discretes can be used to force the SSEC factor to be
 independent from AOA or Mach:
 . zero MACH SSEC
 . zero AOA SSEC.

 Ref. Para. 2.A.(2)(c) for more details.
 No correction is needed for the total pressure received from the
 ADM.
 The results of the above computation is available on these output
 labels:

 . label 176 Left Static Pressure . label 177 Right Static Pressure . label 242 Total Pressure . label 245 Averaged Static Pressure . label 246 Corrected Static Pressure
　
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