Page | 19 Revision Date April 30, 2020 || Document Number UM-E71-314 || Rev B
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4 Powering Up
Two (2) high-density Lithium-ion (Li-ion) battery modules, RRC Power Solutions P/N RRC2054-2, are
required to power the Sierra. Alternatively, Sierra can be powered via the aircraft 28VDC power bus with
the appropriate STC. Refer to Figure 4-1.
Figure 4-1: Power Source
Once power is connected via batteries or external power source, turn the POWER switch to ‘ON’ position
as shown.
Figure 4-2: Power On/Off Switch and Power Indicator
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