Cessna 17273274 Pilot Operating Handbook page 144

CESSNA
MODEL 172N
The warning light may be tested by turning on the landing lights and
momentarily turning off the ALT portion of the master switch while
leaving the BAT portion turned on.
CIRCUIT BREAKERS AND FUSES
Most of the electrical circuits in the airplane are protected by "push-to­
reset" type circuit breakers mounted on the left side of the switch and
control panel. However, alternator output is protected by a "pull-off" type
circuit breaker. In addition to the individual circuit breakers, a toggle
switch/circuit breaker, labeled AVIONICS POWER, on the left side of the
switch and control panel also protects the avionics systems. The cigar
lighter is protected by a manually-reset type circuit breaker on the back of
the lighter, and a fuse behind the instrument panel. The control wheel map
light (if installed) is protected by the NA V LT circuit breaker and a fuse
behind the instrument panel. Electrical circuits which are not protected by
circuit breakers are the battery contactor closing (external power) circuit,
clock circuit, and flight hour recorder circuit. These circuits are protected
by fuses mounted adjacent to the battery.
GROUND SERVICE PLUG RECEPTACLE
A ground service plug receptacle may be installed to permit the use of
an external power source for cold weather starting and during lengthy
maintenance work on the electrical and electronic equipment. Details of
the ground service plug receptacle are presented in Section 9, Supple­
ments.
LIGHTING SYSTEMS
EXTERIOR LIGHTING
Conventional navigation lights are located on the wing tips and top of
the rudder. A single landing light is located in the cowl nose cap. Dual
landing/ taxi lights are available and also located in the cowl nose cap.
Additional lighting is available and includes a flashing beacon mounted
on top of the vertical fin, a strobe light on each wing tip, and a courtesy
light recessed into the lower surface of each wing slightly outboard of the
cabin doors. Details of the strobe light system are presented in Section 9,
Supplements. The courtesy lights are operated by the DOME LIGHTS
switch located on the overhead console; push the switch to the right to turn
the lights on. The remaining exterior lights are operated by rocker
switches located on the left switch and control panel; push the rocker up to
the ON position.
The flashing beacon should not be used when flying through clouds or
1 July 1979
AIRPLANE & SYSTEMS DESCRIPTIONS
SECTION 7
7-27