Instruments Removal And Installation; Gyro Service; Gyro Installation Inspection - Piper PA-24 Comanche Service Manual

PIPER COMANCHE SERVICE MANUAL
The manifold preslUre Pille is a vapor proof. absolute pralUre type iDsaument. Prc:sIure from the
intake manifold of the engine is transmiaed to the insauw.ent throups a line. A poinm indicates the
manifold pressure available at the eftIine in inchG of merewy.
The fuel pressure .allle is a diffemni&1 preaure
inmwnalt
compriJed of a diaphnpn
seftSin,
unit
which sector aDd pinion movement to amplify diaphnpt 1IIOftIDalt. It is mounted ill the clulteT on the
insaurnent panel
On
me PA-24-1BO the
pup
is
co~ to
the fuel
sysran
at the
CIIIiDe
driven file!
pump. while on the PA·24-Z'O.
-260,
and
-400
it is
colUlCCtlCd
at the carburetOr or injectOr fuel inlet
finial.
The
oil
prnsure
pup is mounted in the
dutCf
on the
iDlmamcnt panel.
This
pup
will indie:ue the
amount of oil pressure available at the pralW'iRd
CftJiDe
oil
puap. .
11-1. TroubiesboociD.. For tfOublcshootinc of the
yaria,. iftstrumara.
refer to the aoubleshoocina table
at the end of this section.
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11·8. RaDoYlll And
ta.callacioD
of
1Darumeaa.
SiDce
all
i.utraaleaa
are mounted
in
a
similar
manner, a
description of
&
typical
removal
and installation is provided
u a pide
for
all
face mounted instnammu.
..
Remove the instrument &eCas panel by removinJ the
retaiDinI
screws and
liftint
off the panel.
b. Remove the face panel by removinl the
KrftIS
from around the
perimeter
of the panel.
c. With the face panel removed. the mountinJ
screws
for the
iftdividua1 iastNmena will be exposed.
d. Disconnect the plumbq aneIIor decuica1 connector from the
back
of the instrument. Where two
or more lines
COMect
to an iDsaurnmt, ideacify each liDe
to
fKililace reinaalIation. Attach a dust cap or
pluS to each
finia,.
c.
Remove the screws that secure the instrument
in
the pUleI
CUtout.
f. Remove the instrument from the pando
InstaUation of tbe instrummts
is in
rcYCnC
order
pm
for ranoVll.
Ahu
the installation
is
completed •
and before
replacing
the inStrUmmt access paae1.
check aU
componena for security and clearance of the
conuol column.
A cluster
is
loc:ated on the instrument pand
&Ild
contains
sevcnJ
individual inStrUments. Removal of
the instrument face panel will depose the clear plutic cover on the cl\lSftl'. Rmsove this cover by removing
the two center mounting
screws.
Aim
the plumbiq and/or dectric:al connection bu been removed and
idencified. the individual inmument may be removed from the cluster IIICDlbly.
11-9. G)'IO SerYice Proadurc.
11-10. G)'!'O IJuaIlation IDIpeftioD. The foUowiDa inrpectiolll should be made before removiftl a
mspectcd JYfO inmumeDt from the airplane.
Visual ExaminatioQ:
a,
Has the insaument beeQ modified?
b. Has the insaument been damaged?
c. Does the insaummt show any sips of abuse?
NOTE
00 not cage directional IYro and
Set
to different headinp. The entire
gyro and fixture must be rotated 90 dqrec:s each time without touching
INSTRUMENTS
REVISED: 6/25/78
3
F20
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