CESSNA
SECTION 3
MODEL 172S NAV III
EMERGENCY PROCEDURES
ELECTRICAL POWER SUPPLY SYSTEM
MALFUNCTIONS
(Continued)
LOW VOLTS ANNUNCIATOR COMES ON BELOW 1000 RPM
1. Throttle Control - 1000 RPM
2. Low Voltage Annunciator (LOW VOLTS) - CHECK OFF
LOW VOLTS ANNUNCIATOR REMAINS ON AT 1000 RPM
3. Authorized maintenance personnel must do electrical system
inspection prior to next flight.
LOW VOLTS ANNUNCIATOR COMES ON OR DOES NOT GO
OFF AT HIGHER RPM
1. MASTER Switch (ALT Only) - OFF
2. Alternator Circuit Breaker (ALT FIELD) - CHECK IN
3. MASTER Switch (ALT and BAT) - ON
4. Low Voltage Annunciator (LOW VOLTS) - CHECK OFF
5. M BUS VOLTS - CHECK 27.5 V minimum
6. M BAT AMPS - CHECK CHARGING (+)
IF LOW VOLTS ANNUNCIATOR REMAINS ON
7. MASTER Switch (ALT Only) - OFF
8. 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
(Continued Next Page)
I
172SPHAUS-03
U.S. 3-17