Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 86

CESSNA
MODEL 172S NAV
III
SECTION 3
EMERGENCY PROCEDURES
ELECTRICAL POWER
MALFUNCTIONS
SUPPLY SYSTEM
l
HIGH VOLTS ANNUNCIATOR COMES ON OR M BAT AMPsl
MORE THAN 40
1.
MASTER Switch (ALT Only) - OFF
2. Electrical Load - REDUCE IMMEDIATELY as follows:
a. AVIONICS Switch (BUS
1) -
OFF
b. PITOT HEAT - OFF
c. BEACON Light - OFF
d. LAND Light - OFF (Use as required for landing)
e. TAXI Light - OFF
f. NAV Lights - OFF
g. STROBE Lights - OFF
h. CABIN PWR 12V - OFF
NOTE
• The Main Battery supplies electrical power to the
Main and Essential Buses until M BUS VOLTS
decreases below 20 volts. When M BUS VOLTS
falls below 20 volts, the Standby Battery System
will automatically supply electrical power to the
Essential Bus for at least 30 minutes.
• Select COM1 MIC and NAV1 on the audio panel
and tune to the active frequency before setting
AVIONICS BUS 2 to OFF. If COM2 MIC and
NAV2 are selected when AVIONICS BUS 2 is set
to off, the COM and NAV radios cannot be tuned.
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172SPHAUS-03
U.S. 3-15