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EFFECTIVITY:
CIRRUS AIRPLANE MAINTENANCE MANUAL MODELS SR22 AND SR22T
15 Dec 2014
F. Low Volts Warning Light
Serials w/o Perspective Avionics: The airplane is equipped with a red LOW VOLTS warning light in the
annunciator panel, located on the left side of the instrument panel.
Serials 22-0002 thru 22-1601, 22-1603 thru 22-1643, 22-1645 thru 22-1662: If the Essential Bus volt-
age drops to approximately 24.5 volts, the field control module within the MCU will cause the LOW
VOLTS warning light to illuminate red.
Serials 22-1602, 22-1644, 22-1663 & subs w/o Perspective Avionics: If the Essential Bus voltage drops
to approximately 24.5 volts, the data acquisition unit will cause the LOW VOLTS warning light to illumi-
nate red.
Serials w/ Perspective Avionics: All annunciations are displayed on the MFD as part of the Crew Alert-
ing System (CAS). If the Essential Bus voltage drops to approximately 24.5 volts, the GEA 71 engine
airframe interface will cause the LOW VOLTS warning light to illuminate on the MFD.
Resetting the ALT 1 and ALT 2 switches (from off and back on again) may reset the field control mod-
ule within the MCU. If the warning light does not illuminate again, normal alternator charging has
resumed. If the light illuminates again, a malfunction has occurred. The LOW VOLTS annunciator will
illuminate regardless of how many or what types of power sources are connected.
Illumination of the LOW VOLTS warning light along with ammeter discharge indications may occur
during low RPM conditions with an electrical load on the system, such as during a low RPM taxi. Under
these conditions, the light will go out at higher RPM. The battery switches will not need to be recycled
since an over-voltage condition has not occurred to de-activate the alternator system.
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