PPRuNe Forums - Integrated Standby Instruments System (ISIS) power source?

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rionthai

3rd Sep 2009 06:44

Integrated Standby Instruments System (ISIS) power source?

where does the Integrated Standby Instruments System (ISIS) draw its power from?

h3dxb

3rd Sep 2009 08:52

SUPPLY
ISIS is supplied with 28 VDC from the ESS BUS bar.
In case of loss of this bus bar, the HOT BUS bar automatically takes
over provided the CAS is greater than 50 kt (flight condition).
In case of a power supply cut off less than 50 ms, there is no effect on
the display.

Hope this helps.

rgds

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