--------------------------------------------------------Table 4 - ADR SDI Code
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 4
_
 5
_
 6
_
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. 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 5 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.
 -------------------------------------------------------| SYSTEM | INITIAL NON-FAULT | INPUT TO ADR | | NUMBER | INPUT TO ADR | AFTER FAULT | -------------------------------------------------------
|  1  |  input number 1  |  input number 2  |
 |  2  |  input number 2  |  input number 1  |
 |  3  |  input number 1  |  input number 2  |

 -------------------------------------------------------Table 5 - AOA Resolver Input
 The characteristics of these discretes are OPEN/GROUND =
 AVERAGE/UNIQUE.
 The A/C is defined with the AOA average/unique discrete
 grounded.

VMO/MMO Program Discretes 1 through 4
 These discretes are used to select alternate VMO/MMO levels.
 There are four alternates and a basic VMO/MMO for each
 aircraft type. Table 6 below defines VMO/MMO versus state of
 the VMO/MMO program discretes.
 With no VMO/MMO discretes in the ground state (yes) the ADR
 defaults to the BASIC LAW values for VMO/MMO.
 Only one of the four VMO/MMO program discretes can be in the
 ground state at any one time.

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 7
_
 8
_
 9
_
 If more than one VMO/MMO program discrete is in the ground state at any one time, the ADR defaults to the lowest available alternate condition.
on the A/C only the VMO/MMO DISC 2 is available and is provided by the L/G DOWN VMO/MMO SELECTION switch 22FP. The normal position of this switch is open and it is grounded after crew action for particular flights (ferry flight for example). Table 6 below defines VMO/MMO state according to the position of the switch 22FP.
 ----------------------------------------------------------| | VMO | MMO | SWITCH | | LAW | (kts) | (Mach) | 22FP | ----------------------------------------------------------| BASIC | 350 | 0.82 | OPEN | | ALT 1 * | 235 | 0.60 | N/A | | ALT 2 | 235 | 0.60 | GROUND | | ALT 3 * | 235 | 0.60 | N/A | | ALT 4 * | 235 | 0.60 | N/A | ----------------------------------------------------------
* Spare. Default value included for safety and BITE purpose.
 Table 6 - VMO/MMO Selection
SSEC Alternate discrete The ADR is provided with two Static Source Error Correction (SSEC) data sets to be stored in the computer, for each SDI and each aircraft type, one for use in "normal" conditions and one for use in "alternate" conditions. With the two SSEC selection discretes open (no), the ADR employs the "normal" SSEC curve for the aircraft type in which it is installed. With the two SSEC selection discretes grounded (yes), the ADR employs the "alternate" condition curve.
AOA Alternate discrete The ADR uses the alternate discrete inputs from the two redundant SFCCs to select the angle of attack correction which is appropriate for the current slat and flap settings. Three laws are available for each aircraft type and SDI:
 -
the normal law is activated when all the discretes are open,

 -
the alternate 1 law is activated when discretes 1A and 2A are grounded,

 -
the alternate 2 law is activated when discretes 1A, 2A, 1B and 2B are grounded.
　
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