Specifications

CESSNA SECTION 3
MODEL 172R NAV III EMERGENCY PROCEDURES
GFC 700 AFCS
U.S.
ELECTRICAL POWER SUPPLY SYSTEM
MALFUNCTIONS
HIGH VOLTS ANNUNCIATOR COMES ON OR M BATT
AMPS 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 Switch - OFF
c. BEACON Light Switch - OFF
d. LAND Light Switch - OFF (use as required for landing)
e. TAXI Light Switch - OFF
f. NAV Light Switch - OFF
g. STROBE Light Switch - OFF
h. CABIN PWR 12V Switch - 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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172RPHBUS-00 3-17