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| INPUT SIGNAL | INPUT | INPUT DEFINITION | ----------------------------------------------------------------| Baro Analog/Digital Sel.| Open/GND | Digital/Analog | | Baro Corr. 3 Active | Open/GND | Not Active/Active | ----------------------------------------------------------------Discrete Input Signal
 NOTE : "Open" means either a high logic voltage level or the
____ "binary zero" state. "GND" means either a low logic voltage level or the "binary one" state. "A.I. Com" means grounded to the "Aircraft Ident Common" pin through a resistance of 10 ohms or less. For program pin inputs other than Aircraft I.D., "GND" means grounded to the "Program Pin Common" pin through a resistance of 10 ohms or less.
 1 ADR ARINC Filter Select discrete
_ This discrete is used to select the characteristics of the ADR output filter. Two sets of characteristics are available: Open/Ground = Type A/Type B The A/C is defined with the ADR ARINC filter select discrete open.
 --------------------------------------------------------------| | | TYPE A | TYPE B | | OCTAL | | MAXIMUM | MAXIMUM | | LABEL | SIGNAL | 3db FILTER | 3db FILTER | | | | BANDWIDTH | BANDWIDTH | | | | (HZ)(1) | (HZ) | --------------------------------------------------------------| 203 |Altitude | 8 | 3 | | 204 |Baro Cor. Alt. 1 | 8 | 3 | | 205 |Mach | 8 | 3 | | 206 |Computed Airspeed | 8 | 3 | | 207 |Max Allow. Airspeed | 8 | 8 | | 210 |True Airspeed | 8 | 3 | | 211 |Total Air Temp | 4 | 3 | | 212 |Altitude Rate | 1.8 | 1.8 | | 213 |Static Air Temp | 4 | 3 | | 215 |Impact Pressure | 8 | 3 | | 220 |Baro Cor. Alt. 2 | 8 | 3 | | 221 |Ind. Angle of Attack | 8 | 3 | | 241 |Cor. Angle of Attack | 8 | 3 | | 242 |Total Pressure | N/A (2) | N/A (2) |
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 --------------------------------------------------------------| | | TYPE A | TYPE B | | OCTAL | | MAXIMUM | MAXIMUM | | LABEL | SIGNAL | 3db FILTER | 3db FILTER | | | | BANDWIDTH | BANDWIDTH | | | | (HZ)(1) | (HZ) | --------------------------------------------------------------| 176 |Left Static Pressure | N/A (2) | N/A (2) | | 177 |Right Static Pressure | N/A (2) | N/A (2) | | 245 |Uncorr Avg Static Pressure| N/A (2) | N/A (2) | | 246 |Corr Avg Static Pressure | N/A (2) | N/A (2) | | 251 |Baro Cor. Alt. 3 | 8 | 3 | --------------------------------------------------------------
ADR Output Filter Characteristics
 NOTE : (1) Filters present only as provisions, except for
____ Altitude Rate.
 (2) Filtering of pressure data is performed by the ADM.
CFDS Message Select discrete When open, this discrete is used to select and display fault messages.
Source Data Identifier (SDI) program pins These discretes code the installation side of the ADIRU. This item of information is used to choose the appropriate correction laws (for Static Source Error Correction (SSEC) and corrected angle of attack). The following table gives the ADR side according to the SDI:
 --------------------------------------------------------| DEBOUNCED STATUS | | | |-----------------------------| SDI | ADIRU | | SDI-MSB | SDI-LSB | CODE | NUMBER | |------------------------------------------------------| | OPEN | GND | 01 | 1 | | GND | OPEN | 10 | 2 | | GND | GND | 11 | 3 | --------------------------------------------------------
ADR SDI Code
sensor heat status discretes
 These discrete inputs are used to provide the sensors heat
 status to the ADR.
 These discretes are of the open/ground type.
 When the TAT HEAT DISC is grounded, the TAT sensor is heated.

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 When one of the STATIC, PITOT or AOA HEAT discretes is grounded, it means that the output of the Probe Heat Computer (PHC) heating power supply is faulty and that the concerned probe is no longer heated. In this case the ADR operates as a relay which sends these information signals to the FWC for warning purposes.
AOA Average/Unique program pin The ADR uses the AOA Average/Unique program pin to determine whether one or two angle of attack resolver inputs are used for angle of attack computations. When this program pin indicates "Unique", the ADR uses only a single angle of attack input. If this first AOA input fails, the ADR uses the opposite AOA input, as shown in table below. When this program pin indicates "Average", the ADR calculates angle of attack based on the average of the angle of attack inputs 1 and 2.
　
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