Piper ARCHER III Pilot Operating Handbook page 238

SECTION 7
DESCRIPTION & OPERATION
7.21 ELECTRICAL SYSTEM (continued)
J O - m inutes of power from the emergency battery
is on.Ly available if its voltage is greater than 23.3
volts prior to flight. Ensure that a minimum of 23. 3
volts is available prior to jligh1.
The emergency battery is isolated from the emergency bus equipment via a
relay, which is controlled from the cockpit by the EMERG BA TT switch. The
emergency battery is also isolated from the elecLTic::il power generating system
via a diode in the circuit. This diode will allow the generating system to charge
the emergency battery during normal operations but prevents discharge of the
emergency battery when operating with the alternator off. The emergency battery
is mounted on a shelf in the aft fuselage area just forward of the primary battery.
Switches
All powerplant, electrical power, exterior lights, and avionics master
switches are grouped in an overhead switch panel as shown in Figure 7-10. The
circuit breaker panel is located on the lower right side of the insrrument panel
(Figure 7-9). Each breaker is clearly marked to show which circuil it protects.
Standard electrical accessories include the starter, electrical fuel pump, the
stall warning lift detector, navigational lights, anti-collision lights, landing lights,
and cabin dome lights. The autopilot (optional), pilot heat, ventilation fan, and
air-conditioning (optional) switches are located in the middle of the instrument
panel, just below the G l 000 audio panel.
Two lights mounted in the overhead panel provide cabin flood lighting
for night flying. The lights are controlled by rheostat switches located in the
overhead panel. A map light window in each lens is actuated by an adjacent
switch. A wing tip landing light system consists of two lights (one in each wing
tip} and is operated by a rocker type switch mounted in the overhead switch
panel. Ligh1 intensity for the back- l it switches, instrument panel lights, and the
avionics are controlled by three rotary control located on the insrrumenl panel
jus1 below the electrical accessory switches.
Anti-collision (strobe) lights should not be
operating when flying through cloud, fog or
haze, since the reflected light can produce
spatial disorientation. Strobe lights should not
be used in close proximity to the ground such as
during taxi, takeoff or landing.
REPORT: VB-2749
7-50
PA-28-181, ARCHER ill
I I
CAUTION
\VARNING
ISSUED: December 22, 2017
REVISED: August 29, 2019
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