Gyro Handling And Shipping; Vacuum System; Vacuum Regulator Valve Removal, Installation And Adjustment - Piper PA-24 Comanche Service Manual

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PIPER COMANCHE SERVICE MANUAL
the c:qiJlIlmob. If
JY1'O is
not rowed
and
the
cqinJ
knob
is
employed,
the
IYfO is
not repositioned
in
the
cue, only me card is Nmec:l. this
raults in chedtinl the
tyro
only in one position ae matter how many
badiDp the c:al'd may be
let
to.
CAUTION
Permit no oil, grease. pipe compound. or any foreign material to
enter ports, prior to installation of fittings. Make sure that all air lines
are clean and free of foreign panicles and/or residue before
connecting lines to gyro.
1HO&. Gyro Handlin, ADd SbippiDJ.
Tbe foUowin, informacioQ applies
to
all three inch dim:1:ioDa1 gyros
and attiaade horizoD u.aumCSltS iDIulled
by the factOry or a
Piper faekl
.emce
facility.
Gyro instrumcuts bciDt rcaarDed to the fKtOry
aft
to
be placed in
ap~
cont&iDm with all
pons
properly scaled immediately after ranoval from the aircraft iasuumCSlt panel. The insaument must
a1to
be
accompanied by factory copies of the
WIIrUlty
md cmiit claim
fOnnl. Thae forms
and
the
spcciaJ
containers should be available at
any Piper Dealer UldIor Disaibutor. Should my
I)'TO
inIcnlmcnt be
rcccivcd
by the faC1:Ory i.a
aD
unapproved
cOQuer
or if
the ports
arc
DOt
1C&1cd,
the warranty
will
be
immediately voided md the inmumat
rerumcd
to
the
seder. The iala'umCDt
mue
be lftlItDed
immediately after ranoval from the
airc:nft
(not
to
e:zcccd
15 days followial dilcamy
of
defect).
11·11. Vacuum System. The vacuum sysmn employed to operate the
lYfo iDsaumCSltS is comprised of an
engine driven vacuum pump, oil-air separator, vacuum rqulator valve, and the necesary Nbin, to complete
the system. On me late model Comanche a dry vacuum pump hu been
employed. Whm this type
pump is
installed the Deed for the oil1ir separator and the
hardware
aceaaary for its iDstallacion is eliminated.
A kit
(7$4
356) is available for installation of the dry
vacuum
pump on any of the early model Comanches.
One
vacuum
replator valve is incorporated in the system to contrOl
vacuum
pressure to the JYfo
insmameins. Access to thil valve for maintenance and adjustment is ,aiDed throqh the CIlline cowling. On
the cariy modd Comanche, the replator valve wu mounted on the farewall. while me later models have the
valve installed on the
engine
mount aaembly.
11.12. Vacuum Rquiaor Valve RaDovU ADd IDIaJIatiOD. To remove the replator valve in the enJine
com pamnent, disconnect the thru
lines,
remove the
mountinJ screws
and remove the valve. Install
regulator in
reverse
order
Jiven
for
removal.
After iDrtallation chcdt complete ftcuum
system
for leaks and
proper operation.
11-13. AdjuIlmCD'C Of Vacuum RcpWor Val_. To adjust the replator
valve,
perform the foUowing
steps:
a. Loosen the lock
in, nut or remove the prorective cap from the valve. depcndq on which type is
installed.
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REVISED: 4/10/81
3
F21
INSTRUMENTS