Instrument Panel - Piper PA-28-181 Archer II Pilot Operating Handbook

SECTION
7
DESCRIPTION & OPERATION
PIPER
AIRCRAFT CORPORATION
PA.28-I81, 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
.1 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
with
a
low
setting the gyros
will
be
unreliable.
The
regulator is
located behind the instrurnent panel
and
is
accessible
tiom
below
the
instrument
panel.
7.19 INSTRUMENT
PANEL
The
instrument panel
(Figure 7-15)
is
designed
to
accommodate instru-
rnents and avionics equipment fbr 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.
lt
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
t'ailure. The
ernergency bus switch
is
located behind
the
lower
right
shin guard
leti
of
the
circuit
breaker panel.
An
engine cluster is located to
the
right of
the
pilot
control
wheel and includes
a
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 amnteter, 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
ancl
slip
indicator
or turn
coordinator. The attitude gyro
and
directional gyro
are
vacuum
operatecl through
the use
of
a
vacuum pump
installed on
the engine,
while the turn
and
slip indicator is electrically
operatecl. The vacuum suction
gauge
is on
the
lar right of
the instrument
panel.
REPORT:
VB-1120
7-14
ISSUED: JULY 2,1979
REVISED: JUNE
29,1984