Piper ARCHER II - Instrument Panel

SECTION
7
.
PIPER
AIRCRAFT
CORPORATION
DESCRIPTION
&
OPERATION
PA-28-181,
ARCHER
II
A
vacuum
regulator
is
provided
in
the
system
to
protect
the
gyros.
The
valve
is
set
so
the
normal
vacuum
reads
5.0
+
.]
inches
of
mercury,
a
setting
which
provides
sufficient
vacuum
to
operate
all
the
gyros
at
their
rated
RPM.
Higher
settings
will
damage
the
gyros
and
witha
low
setting
the
gyros
will
be
unreliable.
The
regulator
is
located
behind
the
instrument
panel
and
is
accessible
from
below
the
instrument
panel.
7.19 INSTRUMENT PANEL
The
instrument
panel
(Figure
7-15)
is
designed
to
accommodate
instru-
ments
and
avionics
equipment
for
VFR
and
IFR
flights.
The
radios
and
the
circuit
breakers
are
located
on
the
upper
and
lower
right
panel
respectively,
and
have
circuits
provided
for
the
addition
of
optional
radio
equipment.
An
optional
radio
master
switch
is
located
near
the
top
of
the
instrument
panel
between
the
radio
stacks.
It
controls
the
power
to
all
radios
through
the
aircraft
master
switch.
An
emergency
bus
switch
is
also
provided
to
provide
auxiliary
power
to
the
avionics
bus
in
event
of
a
radio
master
switch
circuit
failure.
The
emergency
bus
switch
is
located
behind
the
lower
right
shin
guard
left
of
the
circuit
breaker
panel.
An
engine
cluster
is
located
to
the
right
of
the
pilot
control
wheel
and
includesa
fuel
pressure
gauge,
a
right
and
left
main
fuel
quantity
gauge,
an
oil
temper-
ature
gauge
and
an
oil
pressure
gauge.
Standard
instruments
include
a
compass,
an
airspeed
indicator,
a
tachometer,
an
altimeter,
an
ammeter,
an
engine
cluster,
and
an
annunciator
panel.
The
compass
is
mounted
on
the
windshield
bow
in
clear
view
of
the
pilot.
The
annunciator
panel
is
mounted
in
the
upper
instrument
panel
to
warn
the
pilot
of
a
possible
malfunction
in
the
alternator,
oil
pressure,
or
vacuum
systems.
Instrument
options
available
for
the
panel
includes
a
suction
gauge,
vertical
speed
indicator,
attitude
gyro,
directional
gyro,
clock,
tru-speed
indicator
and
turn
and
slip
indicator
or
turn
coordinator.
The
attitude
gyro
and
directional
gyro
are
vacuum
operated
through
the
use
of
a
vacuum
pump
installed
on
the
engine,
while
the
turn
and
slip
indicator
is
electrically
operated.
The
vacuum
suction
gauge
is
on
the
far
right
of
the
instrument
panel.
REPORT: VB-1120 ISSUED: JULY 2, 1979
7-14
REVISED:
JUNE
29,
1984