Piper ARCHER III Pilot Operating Handbook page 81

PA-28-181,
ARCHER
III
SECTION
3
EMERGENCY
PROCEDURES
3.5
EMERGENCY
PROCEDURES CHECK LIST (continued)
3.5d
ElectricalFailures(continued)
+
To
ensure 30-minutes of battery life:
Battery
Discharge.
-13 Amps Maximum
Pitot
Heat.....
......14 Minutes
Usage
Maximum
Com Radio
Fuel Pump
3
Mins
Usage
Maximum
2
Mins
Usage
Maximum
Innd
as soon
as
possible.
Turning
the
ALTR
switch OFF, reseting the ALTR FIELD
circuit
breaker and then turning
the
ALTR
back ON,
will
reset the
overvoltage
relay.
If
the trouble was
caused
by a
momentary overvoltage condition
(30.5 volts or higher) this
procedure should return
the ammeter to
a
normal
reading.
If
alternator
does not reset, the battery
will
become the
primary
source
of
electrical power. The only
electrical
bus that remains powered
in
this
load
shed configuration is
the ESSENTIAL BUS.
All
elecrrical items
on
the
remaining
buses
will
be inoperative (See
Figure 7-11), including
the
AVIONICS
dimmer. Display backlighting,
therefore,
is
produced by
the
photocell in
each display.
As
battery
power
is
depleted, there
may be
a
point
where the system voltage reduces
to a
level
that
is
insufficient
to
support the
required electrical load.
In
this
occurrence,
the
emergency
battery should
activate
automatically.
If
the emergency battery
does not
activate automatically, the BATT MASTR
and
ALTR
switches
should
be turned OFF, thereby
allowing
the
emergency battery
to
be the only
remaining
source
of
electrical power. Refer
to
Complete Electrical
Failure
checklist
if
EMER
BATT
ON
advisory illuminates.
REPORT:
VB-2749
3-L9
ISSUED:
December 22, 2Ol7