SECTION 7
PIPER
DESCRIPTION
& OPf,RATION
AIRCRAFT
CORPORATION
PA.28-I8I,
ARCHUR
II
A
vacuum
regulätor is provided
in the
syslem to protect
the g)ros.
I he
vahe rs
se! so the normal \rcuum
reads 5.0
t
I
inches
of mercurv.
a serting
which
provides
sufficient
!acuum
lo operare lll
the
gyfos
ar
iheir ratet
RPM. Higher
r!1!ings $ illdamage rhc gyros
and
wilh a low
se ing
the
gyros
$r1l br
unreliable. Ihe rcgularor is
located
behind the insrrumenr
panel
and
rs accessible from
belo$ the rnslrument panel.
7.19 INSTRT] }1I.:NT
PA\EL
The inslrument panel
(
Frgure l-
l5l is desrgncd
ro
accommodale
instru
mcnrs
and avronrcs equipment
lof
YFR
and
lf R llights
Thc
radios and the circurt breakers
a.e locared
on thc
upper and
to!ver
right
päncl
fcspecrivel! and ha!c
circuirs prorided
tor
rhe addilion
of
oprronal
radlo equrpment. An
oplional rrdio
masrer
swilch
j\
located
near
rhe top
of lhe insrrument pancl
bet$een thc
radio stacks
lt
conrrols the
power
to all radior lhrough rhc
aircrih mastef
swit.h
AD emcrgeocy
bus
sw'tch rs il\o
pro\rdcd
1o
tr.ovide
auxiliarv po$er
to rhe avionics
bLls in
e!enr of a radio masrcr
switch circuit failure.
The
cm€rgcncv
t'us s$itch is
locared
behind the lo$ef right
shin
gurrd
lcfl
of rhecifcuir
brcakcr panel.,{n
.nginc
cluster is located 1o thc
risht ol the pilor
control
$ heet and includes
a
fuel
presluf. g^ugc.
a
righr and lclt main
Iuet
q
uantt!! gauge.
an ort tempcr
arLrre
gauge
rno an orr
ffcssure
gaugc
Slandard insrrunre r\ rnclude
a compa!s.
an rirspccd
indrc,rtor.
a
lachometer. an altr|netcr. rn
ammeter. aD cngine
cluner.
and an,rnnunciaror
panel
The comtass i\ mounled
on the rindshield
bo$
in clear \iew
ofrhc
prlot
lhe annunciator p!rcl
is mounted in
rhe upper innrument
panel
to
lvarn
ihe
pilol
ol
n
pos\ible
malfunclion
in rhe allc.naror,
oitpfcs\ure.
or
Instrument
optrons a\ailablc
for the panet
includc\
a suclion gau-ee.
\crtical
speed indicntor. alritudc g)ro.
dircctional g)ro
ctock. tru
specd
Indicalor
and rurn and rlrp indicarof
or lurn coordinalof.
I he attilude gyro
aDd
drfecflonal
g\ro
a.e \acuum
operared rhrough
lhe
use ol a racuum
pump
lnstalled on the engrne_ N hile
rhe rur n and
slip indrcaror
is elecrricalty
operated. The \acuunr
suclion
gauge
is on
rhe far righi
oi rhe instrumenr
REPORT: vB-1120
7-11
lsstrED:
JULY 2,
1979
REVISED:
JLNE
29, 198.1
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