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3A-8 P/N 13999-002 Info Manual

Section 3A Cirrus Design

Abnormal Procedures SR20

System Malfunctions

Alternator Failure

Abnormal ammeter indications and illumination of the LOW VOLTS

warning light may indicate electrical power supply system

malfunctions. A broken alternator drive belt, wiring fault or a defective

alternator control unit is most likely the cause of the alternator failure.

Usually, electrical power malfunctions are indicated by an excessive

rate of charge or a discharge rate.

Ammeter Indicates Excessive Rate of Charge

After starting engine and heavy electrical usage at low RPM, the

battery will be low enough to accept above normal charging during the

initial part of a flight. 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 in the electrical system can be

damaged by an overvoltage. Normally, the alternator control unit over-

voltage 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

September 2011

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Sharp R-360ES Especificaciones Pagina 78