CIRRUS AIRPLANE MAINTENANCE MANUAL MODELS SR22 AND SR22T
24-30
Page 13
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EFFECTIVITY:
Battery 2 is independently controlled by using the BAT 2 switch, located in the pilot’s bolster panel. The
BAT 2 switch energizes a relay located just aft of bulkhead 222 in the MCU which will connect BAT 2 to
the Essential Bus. The electrical power from BAT 2 reaches the Essential Bus through the circuit
breaker panel. Battery 2 is mounted directly behind bulkhead 222 in an acid resistant battery container.
Battery 2 is primarily used to power the Essential Bus. The Essential Bus delivers electrical power to
the annunciator lights, turn coordinator, attitude indicator, horizontal situation indicator (HSI), stall
warning system, and alternator 2.
Failure of the BAT 1 will not affect the ability of BAT 2 to provide necessary power to the Essential Bus.
Because of diode protection, a failure or malfunction of the BAT 1 will not affect BAT 2 or either alterna-
tor output.
Note: Prior to engine start-up, the pilot must activate only the BAT 2 switch to verify that BAT 2
properly energizes the electrical loads powered by the Essential Bus and that BAT 2 has
proper voltage.
Serials 22-0002 thru 22-1601, 22-1603 thru 22-1643, 22-1645 thru 22-1662: The volt-
age is displayed by the combination Volt / Amp meter mounted on the RH instrument
panel.
Serials 22-1602, 22-1644, 22-1663 & subs: The voltage is displayed by the MFD and
PFD.
15 Dec 2014
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