-------------------------------------------------------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 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.
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.
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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 below defines VMO/MMO state according to the switch (22FP) position.
----------------------------------------------------------| | VMO | MMO | SWITCH | | LAW | (kts) | (Mach) | 22FP | ----------------------------------------------------------
| BASIC | 350 | 0.82 | OPEN |
| ALT 1 | | | |
| ALT 2 | 235 | 0.60 | GROUND |
| ALT 3 | | | |
| ALT 4 | | | |
----------------------------------------------------------
VMO/MMO Selection
SSEC Alternate discrete The ADR is provided with two Static Source Error Correction (SSEC) data sets stored in the computer for each SDI and for each of sixteen aircraft types, one for use in "normal" conditions and the other 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:
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the normal law is activated when all the discretes are open
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the alternate 1 law is activated when discretes 1A and 2A are grounded
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the alternate 2 law is activated when discretes 1A, 2A, 1B and 2B are grounded.
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.
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If this discrete is open, the baro port B is selected.
The A/C is wired with this discrete grounded (Ref. Dual Baro
discrete).
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.
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
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