Mooney M20K - Filters

SERVICE
AND MAINTENANCE
MANUAL
M20K
MOONEY
AIRCRAFT
CORPORATION
37-13-00
-FILTERS
37-14-04
-REINSTALL
All
filters,
except
vacuum
regulator
filter
are
of
paper-
Where hose clearance
is
tight,
making
it
difficult
to
pleated
material
design.
The
vacuum
regulator
filter is
a
reinstall
a
onto
pump
fitting,
spray
fitting
at
hose end
foam-garter
design,
with
silicone.
LET
DRY,
then install
hose
by
pushing
it
37-13-01
MAINTENANCE PRACTICES
straight
on.
Air filter
replacement
intervals:
NOTE
A.
Vacuum
regulator
filter
(2)
every
100
hours.
Do
not
wiggle
hose from
side
to
side.
Wiggling
B. Instrument
filters
(5)
at least
once a
year(see
could
cause
particles
to
be
cut
from hose ID.
Chapter
5-10-01)
These
particles
would
damage
the
pump.
2.
All
filters
require
routine
inspection
of
condition
of
Make
certain
hoses
are
connected to
correct
fittings.
element
and
security
of filter
in
system.
Incorrect
installation
will
cause
damage
to
gyro
system.
3.
All filters
must
be
changed
when
a
new
pump
Install
clamps
and
secure.
is installed.
37-20-00
-IND1CATING
37-13-02
-SERVIC)NG
The
indicating
system
contains
a
low
vacuum
light
All filters
require
no
service
except
routine
inspections.
which illuminates
(Rashes)
when
vacuum
is
below
4.25
Replace
with
new
current
configuration
filters.
.2
In.
Hg.
and
a
high
vacuum
light
which
il-
The alternate
instrument
filter
installation
(6) (Figure
37-
luminates
(steady)
when
vacuum
goes
5.5
(+.2-.0)
In.
1)
should
follow the
same
cleaning
and
replacement
Hg.
or
above.
schedule.
37-21-00
-VACUUM
SWITCH
37-13-03
-REMOVAL
The
vacuum
switch
(7), Pig.
37-1,
is located
on
either
i.
Vacuum
regulator
garter
filter
is
removed
by
th,
Artificial
Horizon
(3)
or
Directional
Gyro (4).
The
il-
stretching
it
over
and off
regulator
frame.
luminating
low
and
high
light
adjustments
are
done
at
2.
Gyro
instrument filters
unscrew
from
the
back
of
switch,
not
on
annunciator
panel.
the
instruments.
37-21-01
-DESCRIPTION
37-13-04
-INSTALLATION
The
switch is
a.low
and
high
vacuum
sensing
adjus-
i.
Prior
to
installing
a new vacuum
regulator
filter,
table
unit.
check
regulator
to
insure that a is clean from
any
foreign
material.
37-21-02
-MAINTENANCE
2. Reinstall
new
filter
in
fitting
and
tighten.
Check
for
switch
security
in
instrument
and all wires
secure
at
switch.
CAUTION
Don’t
over
tighten;
overtightening
will
crack
rear
37-21-03
REMOVAL
housing.
Disconnect
wires and
unscrew
from
aft instrument
37-1 4-00
-HOSES
housing.
37-21-04
-REINSTALL
The hoses
are
of the
aircraft
MIL-H-type.
37-14-01
MAINTENANCE PRACTICES
Install switch
in
housing
and
tighten.
Reconnect wires.
During engine cleaning,
protect
the
discharge
hose:
CAUTION
1.
Plug
end
of hose and
Rag
it with
a
red "Remove
Do
not
over
tighten.
Over
tightening
will
cause
Before
Running Engine"
tag,
then clean
engine.
cracking
of
aft
instrument
housing.
CAUTION
37-21-05
-ADJUSTMENT
Remove
plug prior
to
running
engine. 1. Remove
switch
from instrument.
Reinstall
wires
if
removed.
Attach
poly-vinyl
hose,
’T’
fitting
and
Periodic check
of all
clamps
for
security
is
recom-
mended.
calibrated
gauge
to
vacuum
switch.
Connect
other end
of hose
to
a
vacuum source.
37-14-02
SERVICING
2.
Turn
aircraft
power
on.
The
"low
vac"
light
should
Inspect
inside
of hose
carefully
to
make
sure
it
is clean
flash.
and
free of
all
debris,
oils
or
solvents.
Use
vacuum
or
3-
Apply
vacuum
and
adjust
source
to.4.25
(i/-
.2)
air
pressure
to
clean
lines. Remove
hoses
from
aircraft
In´•
Hg.
Adjust
Low
setting
screw
(connector
end
of
if
necessary,
switch)
to
illuminate
low
vacuum
circuit
on
annunciator
panel.
37-14-03
-REMOVAL
4.
Increase
vacuum source
to
5.5
(+.2-.0)
In.
Hg.
Replace
old,
hard,
cracked
or
brittle
hose,
particularly
Punch
a
small
jewelers
screw
driver
through
poly-vinyl
on
pump
inlet. Sections
of inner
layers
may
separate,
tubeand into
fitting
where
high
setting
screw
is
located
causingpump
failure,
and
adjust
until
"HI/LOW
VAC’
light
on
annunciator
is
illuminated.
37-1
3-00
OLDWILLWAYNE