PFD Operation
4-34 SkyView HDX Pilot’s User Guide – Revision B
If you wish to change the “role” of the two units (for example, make the SV-
ADAHRS-200 the PRIMARY unit, reference the SkyView Classic / SE / HDX System
Installation Guide for details.
For flight data to be displayed, a SkyView HDX system must have a SV-ADAHRS-200 ADAHRS
(Air Data Attitude Heading Reference System) module. For redundancy, SkyView HDX systems
also support the installation of a SV-ADAHRS-201 Backup / Standby ADAHRS module. The
SkyView HDX system continuously monitors the two units and compares their respective flight
data.
If the SV-ADAHRS-200 fails completely, and an SV-ADAHRS-201 is installed, SkyView HDX will
switch to using the SV-ADAHRS-201 for flight data.
If an SV-ADAHRS-200 has failed and an SV-ADAHRS-201 is providing flight data, the
flight can continue normally as there is no functional difference between the SV-
ADAHRS-200 and the SV-ADAHRS-201. The only difference between the two units is
that the SkyView HDX system requires the presence of an SV-ADAHRS-200 prior to
the installation of an SV-ADAHRS-201.
If there is a significant difference in:
• Airspeed
• Altitude
• Attitude (pitch and roll)
• G Meter
• Magnetic heading (compass)
• Turn coordinator (slip / skid ball)
…between the SV-ADAHRS-200 and SV-ADAHRS-201, SkyView HDX will annunciate that there is
a significant difference between the two units (see Figure 84 below) and show the COMPARE
button, which, when pressed, will display a side-by-side comparison of the flight data from each
unit.
If there is a significant difference in flight data between the SV-ADAHRS-200 and
SV-ADAHRS-201 ADAHRS modules, SkyView HDX does not make a decision about
which ADAHRS module is accurate, nor does it automatically switch to using the
secondary module. It is the pilot’s responsibility and task to decide which unit is
providing accurate flight data and to switch the PFD to use that unit’s flight data.
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