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2. If Amps = 0, Failed ALT Master Switch ...........CYCLE (OFF – ON)
3. If Amps remain = 0, Failed ALT Master Switch ........................OFF
4. Failed Alternator Circuit Breaker ............................................PULL
Battery Excessive Rate of Charge
After starting engine and heavy electrical use at low RPM, the battery
will be low enough to accept above normal charging. However, the
ammeter should be indicating less than two needle widths of charging
current after thirty minutes of cruising flight. If the charging rate
remains above this rate, the battery could overheat and evaporate the
electrolyte.
Additionally, electronic components can be damaged by an
overvoltage. Normally, each alternator’s ACU over-voltage sensor
automatically opens the affected alternator’s circuit breaker and shuts
down the alternator if the voltage reaches approximately 31.8 volts. If
the over-voltage sensor fails, perform the following checklist:
Original: 09-28-99
4 of 10 P/N 11934-S10
Section 9 Cirrus Design
Supplements SR20
1. Affected ALT Master Switch .....................................................OFF
2. Affected ALT Circuit Breaker ..................................................PULL
3. Nonessential Electrical Equipment ..........................................OFF
4. Land as soon as practical.
Battery Ammeter Indicates Discharge
In the event of a failure of an alternator, the associated ALT FAIL
caution light illuminates. If both alternators fail, both ALT FAIL lights
will illuminate, the LOW VOLTS warning light will illuminate when the
bus voltage drops to approximately 24.5 volts, and a discharge rate will
be shown on the battery ammeter. An attempt should be made to
reactivate the alternator system by following the checklist below. If the
condition clears, normal alternator charging will resume, the warning
and caution lights will go out, and avionics power may be turned back
on. However, if the lights come on again, a malfunction is confirmed
and the procedure 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 and/or illumination of one or both ALT
FAIL caution lights can occur during low RPM conditions with
a heavy electrical load, such as during low-speed taxi. Under
these conditions, the master switch(es) need not be cycled as
an over-voltage condition has not occurred and the alternator
was not de-activated. The lights should go out at higher RPM.
1. Alternator Circuit Breakers.............................................CHECK IN
2. Ammeter Select Switch..........................................................ALT 1
3. If Amps = 0, ALT 1 Master Switch ...................CYCLE (OFF – ON)
4. If Amps remain = 0
a. ALT 1 Master Switch .........................................................OFF
b. Alternator 1 Circuit Breaker ............................................PULL
5. Repeat steps 2. thru 4. for ALT 2.
6. Ammeter Select Switch.......................................................... BATT
7. Non-essential Electrical Equipment .........................................OFF
Original: 09-28-99
P/N 11934-S10 5 of 10
Cirrus Design Section 9
SR20 Supplements
• Note •
Switch equipment ‘Off’ or pull circuit breakers for nonessential
equipment until BATT amps reading is zero (0) or
positive.
8. If total power failure anticipated, Turn Coordinator Power.....EMER
9. Land as soon as practical.
Section 4 – Normal Procedures
• Note •
All references to “Master Switches” in the basic POH Normal
Procedures shall be interpreted as “Master Switches (ALT2-
ALT-BAT).”
Before Takeoff
There are no changes to the Before Takeoff procedure, except that the
alternator check shall be performed as follows:
1. Alternators ......................................................................... CHECK
a. Pitot Heat.............................................................................ON
b. Avionics ..............................................................................ON
c. Navigation Lights ................................................................ON
d. Landing Light..............................................ON (3 - 5 seconds)
e. Verify both ALT FAIL caution lights out and positive amps
indication for each alternator.
Section 5 - Performance
There is no change to the airplane performance when the dual
alternator system is installed.
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西锐20飞机信息手册 SR22 AIRPLANE INFORMATION MANUAL 1148-126(95)
