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I
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4. B.
(1) (a) ?
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~
I
Selection of
DADC data by the guidance subsystem is treated
differently between the priority (master) NZ-920 and the
nonpriority (slave) NZ-920.
The priority NZ-920 guidance selects and uses the DADC that
is selected by the autopilot as previously described.
The priority (master) NZ-920 guidance subsystem determines
the AFCS selected DADC status by reading the high priority
flight guidance computer (FGC) data.
If
both FGCS are high priority or both low priority then the
FGCS are considered failed and guidance defaults to the left
EFIS and uses the selected DADC. If the left EFIS is not
valid then guidance uses its on-side DADC
if valid. If the
on-side is not valid then it switches to the off-side to get
DADC data.
If the selected DADC used by the FGC fails or the selected
EFIS DADC fails, then guidance continues to follow the
selected DADC and guidance is set invalid.
The nonpriority NZ-920 (slave] guidance subsystem selects
and uses the DADC selected on the EFIS on which the
nonpriority NZ-920 is displayed. Guidance continues to
select the EFIS selected DADC regardless of DADC validity.
If the selected DADC is invalid, guidance is set invalid.
If the nonpriority NZ-920 is not displayed, it defaults to
its on-side DADC if valid.
If default DADC is invalid, the
NZ-920 switches and uses the other remaining DADC if valid.
If both DADCS are invalid, guidance is set invalid.
The nonpriority NZ-920 guidance subsystem reads the EFIS it
is displayed on to determine DADC selection.
If the NZ-920
cannot determine the selection because EFIS is invalid, the
nonpriority NZ-920 defaults to its on-side DADC if valid.
If
the on-side DADC is not valid, the off-side DADC is used.
PZ-800 Performance Computer ASCB Inputs
The NZ-920 inputs and uses only its on-side performance
computer data.
Both basic and background data is used. The
NZ-920 does not read the offside performance computer data.
Inertial Reference System (IRS)
ASCB Inputs
The NZ-920 inputs both left and right IRS data. It
processes and uses data from both IRSS when available and
valid.
22-14-00
Page 298.155
Apr 15/93
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