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cruising flight. If the charging rate remains above this rate, the battery
could overheat and evaporate the electrolyte.
Additionally, electronic components in the electrical system can be
damaged by an overvoltage. Normally, the alternator control unit overvoltage
sensor automatically causes the Alternator circuit breaker to
open and shuts down the alternator if the voltage reaches
approximately 31.8 volts. If the over-voltage sensor fails, perform the
following checklist:
1. Alt Master Switch .....................................................................OFF
2. Alternator Circuit Breaker.......................................................PULL
3. Non-essential Electrical Equipment .........................................OFF
4. Land as soon as practical.
Ammeter Indicates Discharge
If the over-voltage sensor shuts down the alternator, or if the alternator
output is low, a discharge rate will be shown on the ammeter and the
LOW VOLTS warning light will illuminate. This may be a nuisance trip
and an attempt should be made to reactivate the alternator system by
following the checklist below through step 4. If the problem no longer
exists, normal alternator charging will resume, the LOW VOLTS light
will go out, and avionics power may be turned back on. However, If the
light comes on again, a malfunction is confirmed and the procedure
March 2010
Information Manual 3A-9
Cirrus Design Section 3A
SR20 Abnormal Procedures
should be completed. Battery power must be conserved for later
operation of the wing flaps, lights, and other essential equipment.
• Note •
Ammeter discharge indications and illumination of the LOW
VOLTS warning light can occur during low RPM conditions
with a heavy electrical load, such as during taxi. Under these
conditions, the master switch need not be cycled as an overvoltage
condition has not occurred and the alternator was not
de-activated. The LOW VOLTS light should go out at higher
RPM.
1. Avionics Switch ........................................................................OFF
2. Alternator Circuit Breaker ..............................................CHECK IN
3. Alt Master Switch ................................................... CYCLE Off -On
4. Avionics Switch ..........................................................................ON
If ammeter still indicates discharge:
1. Alt Master Switch .....................................................................OFF
2. Non-essential Electrical Equipment .........................................OFF
3. If total power failure anticipated, Turn Coordinator Power.....EMER
4. Land as soon as practical.
LOW VOLTS Warning Light Illuminated
Illumination of the LOW VOLTS light indicates that the voltage
measured at the Essential Bus is 24.5 volts or less. Typically, this
indicates that the airplane is operating on battery power only and both
alternators have failed or are off. If both alternators have failed:
1. Land as soon as practical.
March 2010
3A-10 Information Manual
Section 3A Cirrus Design
Abnormal Procedures SR20
Communications Failure
Communications failure can occur for a variety of reasons. If, after
following the checklist procedure, communication is not restored,
proceed with FAR/AIM lost communications procedures.
• Note •
In the event of an audio panel power failure the audio panel
connects COM 1 to the pilot’s headset and speakers. Setting
the audio panel ‘Off’ will also connect COM 1 to the pilot’s
headsets and speakers.
1. Switches, Controls ............................................................. CHECK
2. Frequency ....................................................................... CHANGE
3. Circuit Breakers.................................................................. CHECK
4. Headset........................................................................... CHANGE
5. Hand Held Microphone .................................................CONNECT
March 2010
Information Manual 3A-11
Cirrus Design Section 3A
SR20 Abnormal Procedures
Pitot Static Malfunction
Static Source Blocked
If erroneous readings of the static source instruments (airspeed,
altimeter and vertical speed) are suspected, the alternate static source
valve, on side of console near pilot’s right ankle, should be opened to
supply static pressure from the cabin to these instruments.
• Note •
If selecting the alternate static source does not work, in an
emergency, cabin pressure can be supplied to the static
pressure instruments by breaking the glass in the face of the
　
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