Piper Cherokee Six - Page 486

PIPER
CHEROKEE
SIX SERVICE
MANUAL
SECTION IX
INSTRUMENTS
9-1. GENERAL.
The instrumentation
in the
Cherokee
Six is designed
to
give a quick
and
actual
indication
of the
attitude,
performance
and condition
of the airplane.
Maintenance,
other
than
described
in
these sections
shall be
done by
the instrument
manufacturer
or an
authorized
repair
station.
The
two types
of instruments
have
been
classified
in this
section as
non-electrical
and
electrical.
The first
part of
this section
will
pertain
to maintenance
and
troubleshooting
of
all
the instruments
and
their systems
which
depend
on non-electrical
sources
for
their
operation.
The
remaining
portion
of this
section
is
directed
to maintenance
and
troubleshooting
of
all the
electrically
operated
instruments.
9-2. NON-ELECTRICAL
INSTRUMENTS.
9-3. VACUUM
SYSTEM.
9-4.
VACUUM
SYSTEM
AND
GYRO
PRESSURE
SERVICE
TIPS. The
following
information
is intended
to acquaint
field
service personnel
with
a means
to diagnose
vacuum
system service
symptoms
on those
components
which
are serviced
by
removal
and
replacement.
These
items include
hoses,
clamps,
gyro filters,
vacuum
regulating
valves
and
vacuum
gauges.
a. Hoses
and
Clamps:
1. These
items
should
be examined
periodically
and inspected
carefully
whenever
engine
maintenance
activities
cause hose
disconnections
to be
made
at the pump,
regulating
valve, gyros and/or
vacuum
gauge.
2.
The ends
of the
hoses
should be
examined
for rubber
separation
and
slivers
of
rubber
on the
inside
diameter
of the
hoses.
These slivers
can
and do
become
detached.
If
this
happens, the
vacuum pump
sucks these
loose particles
and eventually
ingests
them. This
can
cause premature
pump
service.
3.
Hose clamps
and
fittings
should be
replaced
when broken,
damaged
or
corroded.
CAUTION
When replacing
any of
the threaded
fittings, DO
NOT USE
PIPE DOPE
or any
other anti-seize
compound.
The
AIRBORNE
fittings are
all cadmium
plated to
avoid the need
for any other
anti-seize
materials. The
reason for
this caution is
to
protect
the pump
from
ingesting
any foreign
materials
that
could
cause
premature
service.
INSTRUMENTS
Revised:
12/4/79
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