Electrical Power Supply System Malfunctions; Ammeter Shows Excessive Rate Of Charge; (Full Scale Deflection); Low Voltage Annunciator (Volts) Illuminates During Flight (Ammeter Indicates Discharge) - Cessna 172R Operating Handbook

CESSNA
MODEL 172R
ELECTRICAL POWER SUPPLY SYSTEM
MALFUNCTIONS

AMMETER SHOWS EXCESSIVE RATE OF CHARGE

(Full Scale Deflection)
.
1 Alternator
2. Nonessential Electrical Equipment
3. Flight
LOW VOLTAGE ANNUNCIATOR (VOLTS) ILLUMINATES DURING
FLIGHT (Ammeter Indicates Discharge)
Illumination of "VOLTS" on the annunciator panel may
occur during low RPM conditions with an electrical load on
the
conditions, the annunciator will go out
master switch need not
condition has
system.
.
r1
Avionics Master Switch
Alternator Circuit
2.
3. Master Switch
4. Master Switch
5. Low Voltage Annunciator
6. Avionics Master Switch
If low voltage annunciator (VOLTS)
7. Alternator-- OFF.
Nonessential Radio and Electrical Equipment
8.
9. Flight
Revision
--
OFF.
WITH THE ALTERNATOR SIDE OF THE MASTER
SWITCH OFF, COMPASS DEVIATIONS OF AS
MUCH AS 25° MAY OCCUR.
--
TERMINATE as soon as practical.
such as during a low RPM taxi. Under these
system
not occurred to
Breaker (ALT FLD)
--
OFF (both sides).
--
ON.
-
TERMINATE as soon as practical.
7
EMERGENCY PROCEDURES
A
CAUTION
--
NOTE
be recycled since an overvoltage
deactivate the alternator
-
OFF.
--
(VOLTS)
--
ON.
illuminates
SECTION 3
OFF.
higher RPM. The
at
--
CHECK IN.
CHECK OFF.
again:
-
OFF.
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