ISIS INTERNALS:
ISIS BREAKDOWN:
ISIS INTERFACES:
AIB Presentation 2003,
Considering connection with IR Bus ADIRU 1 / 3,
besides the supply switching.
AMM:
Two ARINC 429 high-speed buses provide the ISIS indicator with the ADIRU ground speed information.
This information is used as a backup source for ISIS ground/flight condition.
and,
Optional magnetic heading.
The magnetic heading provided by the IR1 or IR3 enables the display of the magnetic heading information.
.......
In case of detected failure of the selected ADIRU, a red HDG Flag is displayed in place of the magnetic heading indications.
A33Tech.