S201 AFM
3 - EMERGENCY PROCEDURES
3.10 - OTHER EMERGENCIES
27/06/2019
SONAIR-S2-D-MAN-006
Page : 3-44
Rev. : A
•
Transition to and from battery
The unit will automatically transition to internal battery if the aircraft power
drops below approximately 7 VDC. At this point, one of two operational
sequences will occur, depending on if the aircraft is on the ground or in the air.
This logic is tied to the current indicated airspeed as follows:
-
In Flight: If airspeed is above 40 knots, transition will occur to battery with
no pilot action required. Only the amber ON BATTERY indication will be
shown
–
no other popup menus or messages will be presented.
-
On Ground: If airspeed is below 30 knots, a shutdown timer will be
displayed. If the pilot takes no action, the unit will automatically shut-
down in approximately 45 seconds. This is the normal on-ground
shutdown sequence.
If the rotary knob is pushed to cancel the count-down timer, the unit will remain
on and continue to operate from battery power. The amber ON BATTERY
indication will be shown.